Subjects: Library Science，Information Science >> Library Science submitted time 2023-07-26 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] This paper aims to construct a PROV provenance model and user credibility evaluation index for information dissemination process, quantify the credibility of information, and enrich and improve the method of credibility evaluation of socialized Q&A community platform.[Method/process] The paper analyzed the credibility of the data origination concept assessment information from the perspective of the information dissemination process, traced and recorded the source and dissemination of the information by establishing the relevant PROV data provenance model. The process, combined with the user credibility scores involved in the information dissemination process, was used to calculate the quantitative results of the credibility of the information.[Result/conclusion] Through the evaluation of the credibility of information, the information credibility evaluation method is further improved, which provides a new idea for optimizing the quality of community information.
Subjects: Library Science，Information Science >> Information Science submitted time 2018-10-19 Cooperative journals: 《智库理论与实践》
Abstract： 新中国成立至今，中国外交已经经历了“生存与革命外交”和“发展外交”两个发展阶段，目前进入了第三个阶段——“中国特色大国外交”阶段。 与前两个发展阶段相比，中国特色大国外交更加注重发挥智库的作用。中国特色新型智库将会围绕“资政” “启民” “伐谋” “育才“四个主要职能服务于中国特色大国外交。
Subjects: Library Science，Information Science >> Information Science submitted time 2023-04-01 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] This paper studies the impact of multi-dimensional characteristics on Social Q&A Communities answer ranking, which can improve the service quality in Social Q&A Communities and optimize the user experience.[Method/process] This paper constructed a Social Q&A Communities answer ranking feature system from the answer feature, respondent feature and voter feature dimensions, and then we compared the applicability of 11 ranking learning algorithms based on deep learning, tree, neural network and support vector machine in Social Q&A Communities data set, and train random forest classification algorithm to get the importance of each feature.[Result/conclusion] The experimental results show that the sorting learning algorithm based on deep learning performs better than other sorting algorithms in NDCG@k and MRR indexes, and the influence characteristics of voters are very important, followed by the content characteristics of the answers, and finally the professional characteristics of the respondents. From the two dimensions of increasing the diversity of the answer ranking method and improving the comprehensiveness of the answer ranking algorithm, we provide some suggestions for the optimization of community answer ranking.
Subjects: Psychology >> Social Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： From the perspective of social media group polarization, how should enterprises with strong stereotypes deal with the damage causing by weak stereotyped consumers? Previous studies have focused on enterprises harm to consumers and their responses, less attention has been paid to how enterprises responses after being harmed by consumers. The difference lies in the shifting of the roles of harmer and victim, as well as the shifting of the contrast between strength and weakness. In view of this, based on the theory of group polarization, this paper conducts research on the core issue of “how to deal with damaged brands to obtain/eliminate polarized support/opposition of onlooker consumer groups in the social media environment”, and explore the double valence coping strategies.According to the logical framework of group polarization theory: information persuasion strategy-group emotional resonance-group polarization results, we carry out three studies in general. (1) From the perspective of damaged brands, how should enterprises with strong stereotypes express their sad expression in order to gain polarized support from onlooker consumer groups? The conclusion is expected to be that enterprises adopted anthropomorphism (vs. non-anthropomorphic) and expressed group sympathy play a continuous mediating role in the context of social media, when infringing consumers cause brand harm. (2) From the perspective of onlooker consumer groups, how can enterprises with strong stereotypes unite with onlooker consumer groups to gain support from their group polarization? Expected conclusion is that the enterprise appealing for victim transfer (vs. no victim transfer) will make onlookers consumer groups have group polarization support, and the group-hate resonance of onlookers consumer groups to infringing consumers plays a mediating role in the social media environment, when infringing consumers cause damage to the brand. (3) From the perspective of infringing consumers, how to eliminate the polarization of onlooker consumer groups caused by enterprises punishing infringing consumers? Expected conclusion is that in the context of social media, victim significance (vs.no victim significance) will weaken or even eliminate the group polarization of onlooker consumer groups to brands, and the group anger resonance of onlookers to brands plays a significant mediating role. Overall, the theoretical contributions of this study are mainly reflected in the following three aspects First, from the perspective of research questions, this study puts forward a new research direction on how enterprises should deal with consumers' brand damage in the social media environment, filling in the theoretical system of brand crisis response; Second, from a theoretical perspective, this study proposes group polarization as an effective test basis and explanation mechanism support for damaged brand coping strategies, which expands the theoretical construction and explanation of brand crisis response. Third, from the perspective of individual infringing consumers, based on the theory of group polarization, in this study different appeal methods are proposed from the perspectives of victims, victims and onlookers, which will enrich the specific strategies for brand crisis response. In addition, based on the conclusions expected of this study, the management implications can be summarized as the following points. First, from the perspective of enterprises, this study provides valuable guidance on how damaged brands with strong stereotypes can "obtain/eliminate" the polarized "support/opposition" of onlooker consumer groups in the social media environment. Second, from the viewpoint of industry, conclusions of this study have reference significance for how the strong party should respond after being hurt by the weak party in the fields of government, education, and medical care . Finally, from a social perspective, the expected conclusions in this study can alleviate or eliminate the huge risks and adverse consequences brought by the negative polarization of groups in the social media environment to the whole society.
Subjects: Psychology >> Social Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： HPA axis (Hypothalamic - Pituitary - Adrenal, HPA) dysfunction determines the formation or deterioration of stress-related emotional disorders. As a special stress-related disease, premenstrual syndrome (PMS) appears before menstruation and disappears after menstruation. This stable and explosive phenomenon reflects acute stress. On the other hand, the premenstrual discomfort symptoms are considered chronic stress, which may last about 30 years. In order to provide a more comprehensive understanding of the pathological mechanisms of PMS, we relied on two types of the activity patterns of HPA axis, namely activity patterns at the baseline level and activity patterns after experimental manipulations on stress levels. The current meta-analysis study included 32 studies (total sample size N = 1280) from 1990 to 2021. We investigated the difference of cortisol levels in luteal phase and follicular phase between PMS women and controls. In addition, we investigated the moderating roles of the cortisol measurement method, cortisol measurement time, PMS/PMDD sample size, and diagnostic type. Because of age-related changes in female hormone secretion and regional differences in menstruation attitude, we further investigated the moderating roles of age and area. 牋We found that the cortisol of PMS individuals in the luteal phase was significantly lower than that of the controls at the baseline level. This effect was moderated by the time of cortisol measurement. At follicular stage, there was no significant difference in cortisol content between PMS women and controls. Similarly, in the experimental studies manipulating stress levels, the cortisol content of PMS women in the luteal phase was significantly lower than that of the controls, but the two groups did not differ in the cortisol content of the follicular phase. The moderating roles of cortisol measurement method, PMS/PMDD sample size, diagnostic type, age and area were not significant. 牋The findings suggested that the persistent changes of the HPA axis and blunted reactivity of HPA axis to pressure might be pathological mechanisms of PMS. The inactivation of the HPA axis at the baseline reflected the lasting change of the neurobiological system due to long-term ineffective activation, while the inactivation of the HPA axis in the experimental studies directly showed blunted reaction to subsequent stressors. Blunted baseline cortisol response may be a risk factor to the development of PMS. Thus, future studies need to further clarify the role of blunted baseline cortisol response on the occurrence of PMS using a longitudinal design. 牋In addition, the results of the follicular phase were unstable in both the baseline and experimental studies, influenced by depression history and trauma experience. 牋The study responds to the controversy of the existing research findings on the topic and provides a deeper understanding for the pathological mechanisms of PMS. Based on the findings of this study, the roles of the time effect of cortisol measurement and stress regulation strategies should be considered in future research.
submitted time 2023-03-25 Cooperative journals: 《心理科学进展》
Abstract： From the perspective of social media group polarization, how should enterprises with strong stereotypes deal with the damage causing by weak stereotyped consumers? Previous studies have focused on enterprises harm to consumers and their responses, less attention has been paid to how enterprises responses after being harmed by consumers. The difference lies in the shifting of the roles of harmer and victim, as well as the shifting of the contrast between strength and weakness. In view of this, based on the theory of group polarization, this paper conducts research on the core issue of “how to deal with damaged brands to obtain/eliminate polarized support/opposition of onlooker consumer groups in the social media environment”, and explore the double valence coping strategies.According to the logical framework of group polarization theory: information persuasion strategy-group emotional resonance-group polarization results, we carry out three studies in general. (1) From the perspective of damaged brands, how should enterprises with strong stereotypes express their sad expression in order to gain polarized support from onlooker consumer groups? The conclusion is expected to be that enterprises adopted anthropomorphism (vs. non-anthropomorphic) and expressed group sympathy play a continuous mediating role in the context of social media, when infringing consumers cause brand harm. (2) From the perspective of onlooker consumer groups, how can enterprises with strong stereotypes unite with onlooker consumer groups to gain support from their group polarization? Expected conclusion is that the enterprise appealing for victim transfer (vs. no victim transfer) will make onlookers consumer groups have group polarization support, and the group-hate resonance of onlookers consumer groups to infringing consumers plays a mediating role in the social media environment, when infringing consumers cause damage to the brand. (3) From the perspective of infringing consumers, how to eliminate the polarization of onlooker consumer groups caused by enterprises punishing infringing consumers? Expected conclusion is that in the context of social media, victim significance (vs.no victim significance) will weaken or even eliminate the group polarization of onlooker consumer groups to brands, and the group anger resonance of onlookers to brands plays a significant mediating role. Overall, the theoretical contributions of this study are mainly reflected in the following three aspects First, from the perspective of research questions, this study puts forward a new research direction on how enterprises should deal with consumers' brand damage in the social media environment, filling in the theoretical system of brand crisis response; Second, from a theoretical perspective, this study proposes group polarization as an effective test basis and explanation mechanism support for damaged brand coping strategies, which expands the theoretical construction and explanation of brand crisis response. Third, from the perspective of individual infringing consumers, based on the theory of group polarization, in this study different appeal methods are proposed from the perspectives of victims, victims and onlookers, which will enrich the specific strategies for brand crisis response. In addition, based on the conclusions expected of this study, the management implications can be summarized as the following points. First, from the perspective of enterprises, this study provides valuable guidance on how damaged brands with strong stereotypes can "obtain/eliminate" the polarized "support/opposition" of onlooker consumer groups in the social media environment. Second, from the viewpoint of industry, conclusions of this study have reference significance for how the strong party should respond after being hurt by the weak party in the fields of government, education, and medical care . Finally, from a social perspective, the expected conclusions in this study can alleviate or eliminate the huge risks and adverse consequences brought by the negative polarization of groups in the social media environment to the whole society.
submitted time 2023-03-25 Cooperative journals: 《心理科学进展》
Abstract： HPA axis (Hypothalamic - Pituitary - Adrenal, HPA) dysfunction determines the formation or deterioration of stress-related emotional disorders. As a special stress-related disease, premenstrual syndrome (PMS) appears before menstruation and disappears after menstruation. This stable and explosive phenomenon reflects acute stress. On the other hand, the premenstrual discomfort symptoms are considered chronic stress, which may last about 30 years. In order to provide a more comprehensive understanding of the pathological mechanisms of PMS, we relied on two types of the activity patterns of HPA axis, namely activity patterns at the baseline level and activity patterns after experimental manipulations on stress levels. The current meta-analysis study included 32 studies (total sample size N = 1280) from 1990 to 2021. We investigated the difference of cortisol levels in luteal phase and follicular phase between PMS women and controls. In addition, we investigated the moderating roles of the cortisol measurement method, cortisol measurement time, PMS/PMDD sample size, and diagnostic type. Because of age-related changes in female hormone secretion and regional differences in menstruation attitude, we further investigated the moderating roles of age and area. 牋We found that the cortisol of PMS individuals in the luteal phase was significantly lower than that of the controls at the baseline level. This effect was moderated by the time of cortisol measurement. At follicular stage, there was no significant difference in cortisol content between PMS women and controls. Similarly, in the experimental studies manipulating stress levels, the cortisol content of PMS women in the luteal phase was significantly lower than that of the controls, but the two groups did not differ in the cortisol content of the follicular phase. The moderating roles of cortisol measurement method, PMS/PMDD sample size, diagnostic type, age and area were not significant. 牋The findings suggested that the persistent changes of the HPA axis and blunted reactivity of HPA axis to pressure might be pathological mechanisms of PMS. The inactivation of the HPA axis at the baseline reflected the lasting change of the neurobiological system due to long-term ineffective activation, while the inactivation of the HPA axis in the experimental studies directly showed blunted reaction to subsequent stressors. Blunted baseline cortisol response may be a risk factor to the development of PMS. Thus, future studies need to further clarify the role of blunted baseline cortisol response on the occurrence of PMS using a longitudinal design. 牋In addition, the results of the follicular phase were unstable in both the baseline and experimental studies, influenced by depression history and trauma experience. 牋The study responds to the controversy of the existing research findings on the topic and provides a deeper understanding for the pathological mechanisms of PMS. Based on the findings of this study, the roles of the time effect of cortisol measurement and stress regulation strategies should be considered in future research.
Subjects: Psychology >> Personality Psychology submitted time 2023-01-06
Abstract：
HPA axis (Hypothalamic - Pituitary - Adrenal, HPA) dysfunction determines the formation or deterioration of stress-related emotional disorders. In order to provide a more comprehensive understanding of the pathological mechanisms of PMS, we relied on two types of the activity patterns of HPA axis, namely activity patterns at the baseline level and activity patterns after experimental manipulations on stress levels. The current meta-analysis study included 32 studies (total sample size N = 1280) from 1990 to 2021. We found that the cortisol of PMS individuals in the luteal phase was significantly lower than that of the controls at the baseline level. This effect was moderated by the time of cortisol measurement. At follicular stage, there was no significant difference in cortisol content between PMS women and controls. Similarly, in the experimental studies manipulating stress levels, the cortisol content of PMS women in the luteal phase was significantly lower than that of the controls, but the two groups did not differ in the cortisol content of the follicular phase. The findings suggested that the persistent changes of the HPA axis and blunted reactivity of HPA axis to pressure might be pathological mechanisms of PMS. Future research should focus on stress regulation strategies to improve PMS.
Peer Review Status:
Awaiting Review
Subjects: Management Science >> Enterprise Management submitted time 2022-12-01
Abstract：
From the perspective of social media group polarization and facing the harm brought by consumers with the stereotype of the weak, how should the enterprises with stereotype of the strong deal with it? According to the logical line of group polarization theory: information persuasion strategy - group emotional resonance - group polarization results, we conducted three studies: from the perspective of the injured brand, how do enterprises express that they are a victim so that the injured brand will win the group polarization support of bystanders? From the perspective of bystanders, how should enterprises cooperate with bystanders to gain their group polarization support? And from the perspective of infringing party, how can enterprises eliminate the group polarization opposition from bystanders caused by punishing infringing party?
Peer Review Status:Awaiting Review
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-08-13 Cooperative journals: 《计算机应用研究》
Abstract： Intelligent Internet of Vehicle (IIOV) gathers relative traffic information by all kinds of on-ground sensors. The gathered data often include irregular spatial and temporal resolution, so losing data is a common problem of IIOV. In order to solve this problem, this paper proposed a kind of new approach of losing data evaluation for IIOV which was named tensor low-rank approximation(VBPCA) based on the extracting the common traffic pattern and comparing the function estimation & tensor decomposition. The approach can get the traffic patterns under the cases of losing data and the expression of low-rank. In the experiments to test the approach, it select about 1000 road segments to do the analysis. The results show that this approach has good performance on evaluation accuracy, the bias of the data set, so it is very useful for the application of intelligent internet of vehicle.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-04-19 Cooperative journals: 《计算机应用研究》
Abstract： Many malware families such as botnet utilize domain generation algorithms(DGAs) to evade detection at present. The mainstream detection algorithms based on artificial rules and machine learning have some limitations due to the fact that DGAs generate domain characters timely and rapidly. The former is somewhat blind to new DGA variants. The latter suffers from the lack of evolving training data. In order to solve these problems, domain encoder and decoder on account of the method of Ascall encoding was defined in this paper and they were combined with the concept of generative adversarial network(GAN) to construct domain character generator. Then the generator was used to predict and generate DGA variants. Experiment results show that the DGA variants generated by this method can act as real DGA samples when these variants are utilized to train and estimate classifiers . This verifies the validity of the generated data and they can be effectively utilized to train and estimate DGA domain detector.
Subjects: Biology >> Zoology submitted time 2017-10-11 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究饲粮添加脯氨酸对妊娠环江香猪体成分的影响。选取32头妊娠15 d的环江香猪，随机分为2组，每组8个重复，每个重复2头猪。分别饲喂在基础饲粮中添加0.77% L-丙氨酸（等氮对照组）和1.00% L-脯氨酸（脯氨酸组）的饲粮。分别于妊娠第45和70天时，每个重复选择1头母猪屠宰，测定其体成分。结果表明：与等氮对照组相比，妊娠第45天时脯氨酸组环江香猪的脂肪率显著降低（P<0.05），皮肤率呈增加趋势（0.05≤P<0.10）；妊娠第70天时脯氨酸组的脂肪率显著增加（P<0.05），皮肤率呈降低趋势（0.05≤P<0.10），背最长肌中脯氨酸的含量显著增加（P<0.05），精氨酸和丙氨酸的含量呈增加趋势（0.05≤P<0.10）。与妊娠第45天时相比，妊娠第70天时脯氨酸组的脂肪率显著增加（P<0.05），瘦肉率与皮肤率显著降低（P<0.05）。由此可见，饲粮添加脯氨酸可增加妊娠环江香猪机体脂肪和精氨酸的沉积量，妊娠中期的机体脂肪沉积量比妊娠前期有所增加，从而有利于胎儿的生长发育。
Subjects: Biology >> Ecology submitted time 2018-05-29 Cooperative journals: 《生态学报》
Abstract：在自然条件下，测定分析了夏季和秋季静风天及秋季大风天，海岸沙丘不同坡向环境因子及滨麦株高、叶片叶绿素含量、土壤含水量和光合日变化特性，以期明晰滨麦响应不同风速环境的生理调控机理。结果表明，不同坡向环境异质性明显，滨麦形态可塑性强。海岸迎风坡风大、温度低、湿度大，滨麦植株低矮、叶绿素含量较高；背风坡温度高、土壤干旱、空气流动差，滨麦植株高大，叶绿素含量低。在夏秋季静风天，迎风坡和背风坡滨麦叶片Pn出现光合"午休"现象，但迎风坡滨麦日均Gs、Tr、Pn均显著高于背风坡；而在秋季大风天，迎风坡和背风坡滨麦叶片Pn"午休"现象消失，并且背风坡滨麦日均Pn、Tr、Gs均显著高于迎风坡滨麦。同坡向相比，秋季大风天迎风坡滨麦日均Pn、Tr、Gs明显较秋季静风天低，而背风坡滨麦日均叶片Pn、Tr、Gs却较静风天分别增高126%、66.3%、134%。强海风吹袭引发迎风坡温度降低、滨麦叶片摇摆、气孔导度降低导致Pn下降，而强海风使背风坡空气流动加快、温度降低、气孔导度增大、"午休"消失使Pn增高。不同坡向滨麦对不同海风风速的适应表现出明显的光合生理可塑性，它在滨麦适应不同风力、提高其光合速率和增加物质积累上具有重要作用。而滨麦的形态和光合生理可塑性可能是其在不同海风强度下生存、生长、实现种群扩张的重要生理调控机理，这一特性在未来作物、牧草和树木抗风、抗盐育种中具有重要应用价值。
Subjects: Biology >> Zoology submitted time 2018-12-25 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究饲粮不同油脂比例对冬毛期雄性银黑狐生长性能、血清生化指标及肠道形态结构的影响。试验选取48只157日龄、平均体重为（5 450±140） g的健康雄性银黑狐，随机分成4组，每组12个重复，每个重复1只。4种试验饲粮中油脂比例不同，但添加量均为14%，其中Ⅰ组试验饲粮中油脂由12.00%的鱼油和2.00%的豆油组成，Ⅱ组试验饲粮中油脂由9.38%的玉米油和4.62%的豆油，Ⅲ组试验饲粮中油脂由12.00%的玉米油和2.00%的豆油组成，Ⅳ组试验饲粮中油脂由1.50%的鱼油和12.50%的玉米油。预试期7 d，正试期40 d。结果表明：1）饲粮不同油脂比例对银黑狐的体长有显著影响（P0.05）。Ⅱ组体长显著高于Ⅳ组（P0.05）。2）饲粮不同油脂比例对血清甘油三酯（TG）和低密度脂蛋白胆固醇（LDL-C）含量有显著或极显著影响(P0.05）。Ⅱ组血清TG显著低于Ⅰ、Ⅲ和Ⅳ组（P0.05）。Ⅱ组血清GLOB含量显著高于Ⅲ和Ⅳ组（P0.05）。4）饲粮不同油脂比例对血清补体4（C4)含量有显著影响（P0.05）。Ⅲ组血清C4含量显著低于Ⅰ、Ⅱ和Ⅳ组(P0.05）。5）饲粮不同油脂比例极显著影响了肠道绒毛高度、隐窝深度和绒毛高度/隐窝深度（P0.05）；Ⅱ组绒毛高度/隐窝深度极显著高于Ⅰ组（P0.05）。综合本试验结果可知，饲粮油脂来源为9.38%玉米油和4.62%豆油时，降低了血清中TG和LDL-C的含量，升高了血清中GLOB的含量，改善了肠道形态结构，从而促进了冬毛期雄性银黑狐体长的增加。
Subjects: Library Science，Information Science >> Information Science submitted time 2017-12-05 Cooperative journals: 《数据分析与知识发现》
Abstract：【目的】识别并获取细粒度的用户偏好信息, 优化图书个性化推荐的效果。【方法】使用情感分析方法对 用户图书评论进行属性层文本挖掘, 通过用户本身的图书评论获取用户对图书属性的偏好; 基于每本图书的所 有评论的情感计算获得其属性评分; 将用户偏好矩阵、图书属性得分矩阵进行匹配, 从而实现用户对图书属性情 感偏好的个性化推荐。【结果】利用亚马逊图书评论数据作为数据来源分别对传统的协同过滤方法与本文提出的 推荐方法进行实验对比。结果表明, 本文提出的方法在准确性、召回率、覆盖率上分别提高了 0.030、0.097、0.2812。 【局限】未考虑时间因素对用户偏好的影响, 并且属性类型的全面程度受亚马逊图书评论数量和质量的限制。 【结论】本文计算用户对图书属性的情感得分, 得到细粒度的用户偏好信息, 并通过与图书属性的得分进行匹配, 提升了图书个性化推荐的效果。
Subjects: Library Science，Information Science >> Information Science submitted time 2017-11-30 Cooperative journals: 《数据分析与知识发现》
Abstract：【目的】识别并获取细粒度的用户偏好信息, 优化图书个性化推荐的效果。【方法】使用情感分析方法对 用户图书评论进行属性层文本挖掘, 通过用户本身的图书评论获取用户对图书属性的偏好; 基于每本图书的所 有评论的情感计算获得其属性评分; 将用户偏好矩阵、图书属性得分矩阵进行匹配, 从而实现用户对图书属性情 感偏好的个性化推荐。【结果】利用亚马逊图书评论数据作为数据来源分别对传统的协同过滤方法与本文提出的 推荐方法进行实验对比。结果表明, 本文提出的方法在准确性、召回率、覆盖率上分别提高了 0.030、0.097、0.2812。 【局限】未考虑时间因素对用户偏好的影响, 并且属性类型的全面程度受亚马逊图书评论数量和质量的限制。 【结论】本文计算用户对图书属性的情感得分, 得到细粒度的用户偏好信息, 并通过与图书属性的得分进行匹配, 提升了图书个性化推荐的效果。
Subjects: Biology >> Zoology submitted time 2018-12-24 Cooperative journals: 《动物营养学报》
Abstract：饲粮能量直接影响毛皮动物生产性能，如何真实评价动物对饲料能量的需要、利用及能量转化效率是能量代谢研究的重点。毛皮动物维持能量受动物的基础代谢、环境温度、饲养管理、品种、营养物质代谢热增耗等因素的影响。本文综述了毛皮动物能量代谢的研究进展，为毛皮动物精细化饲养和饲料的精准配制提供充足的理论依据。
Subjects: Biology >> Botany >> Applied botany submitted time 2019-06-17 Cooperative journals: 《广西植物》
Abstract：无论在农田还是自然生态系统中，土壤养分异质性普遍存在，而植物可感知土壤养分异质性，并调节根系生物量分配及空间分布以获取更多资源。作为一种重要的养分胁迫因子，根部半寄生植物对寄主植物根系空间分布的影响及受养分供应水平的调节如何还不得而知。了解寄生胁迫在不同养分条件下对寄主生长发育及根系空间分布的影响，对解析寄主应对寄生胁迫和养分胁迫的适应策略，进而指导寄生性杂草防控具有重要指导意义。本研究采用分根试验，通过对寄主分根，并控制根室两侧氮供应水平及寄生胁迫程度，考察了氮胁迫及两种寄主依赖程度不同的马先蒿的寄生对寄主长芒棒头草生长发育及根系空间分布的影响。结果显示：（1）土壤氮水平与马先蒿寄生均可显著影响长芒棒头草生物量及根冠比，并且两者之间存在显著交互作用，其中土壤氮水平为主要影响因子。（2）两种马先蒿对长芒棒头草的危害程度不同，NPK和2NPK 处理时三色马先蒿的寄生显著降低长芒棒头草生物量（茎叶：37.1％，51.5％；根系：35.6％，63.6％）；而在NPK处理时大王马先蒿的寄生显著增加长芒棒头草生物量（茎叶：29.9％，根系：61.2％）。（3）长芒棒头草的根系生长和空间分布受氮营养的异质分布和寄生的影响，具有明显的感知养分空间分布及调节根系生长能力。
Subjects: Biology >> Zoology submitted time 2018-12-24 Cooperative journals: 《动物营养学报》
Abstract：为了研究发酵白酒糟对断奶仔猪生长性能、消化代谢和氮排放的影响，选用21日龄断奶的去势杜×长×大公猪24头，随机分为4组，每组6个重复，每个重复1头猪。对照组饲喂基础饲粮，试验组分别用2%、4%和6%发酵白酒糟等比例替代基础饲粮。分别于平均体重为10和25 kg左右时，试验猪转入代谢笼内进行消化代谢试验。每个试验期为1周，前4 d为适应期，后3 d为粪尿收集期。记录仔猪的日采食量，并于每次试验开始和结束时称取空腹体重。采用全收粪法测定断奶仔猪对常规营养成分和氨基酸的表观消化率以及氮排放量。结果表明：与对照组相比，在10 kg断奶仔猪试验中，2%发酵白酒糟组的表观消化能和尿氮量显著降低（P0.05）；4%和6%发酵白酒糟组的总能、赖氨酸、蛋氨酸和脯氨酸的表观消化率、表观代谢能和表观消化能均显著降低（P0.05），平均日增重显著增加（P<0.05）；6%发酵白酒糟组的蛋氨酸表观消化率显著下降（P<0.05）；2%、4%和6%发酵白酒糟组的摄入氮量、吸收氮量、沉积氮量、粗蛋白质和总能的表观消化率、氮表观消化率、表观代谢能和消化能均显著降低（P<0.05），粪氮量显著增加（P<0.05）。由上可见，饲粮添加2%发酵白酒糟不影响断奶仔猪对干物质的表观消化率，可增加其生长性能；长期高剂量添加发酵白酒糟在一定程度上降低了断奶仔猪对常规营养成分的消化代谢。
Subjects: Biology >> Botany submitted time 2022-11-24 Cooperative journals: 《广西植物》
Abstract：
To explore the influence of topographic factors on the diversity and spatial distribution of plant species around FAST (Five-hundred-meter Aperture Spherical radio Telescope), three typical plant communities (tree layer, shrub layer, vine layer) in the Karst peak-cluster depression around FAST were selected as the study objects, and ANOVA and Canonical Correspondence Analysis (CCA) were used to investigate the species diversity and spatial distribution of plant communities under different topographic factors (altitude, slope, aspect, and gradient). The results were as follows: (1) The α-diversity index of plant communities around FAST shows a trend of shrub layer > tree layer > vine layer, and the α-diversity index of plants in the tree layer and vine layer gradually increases with altitude (P<0.05), while the topographic factor has no significant effect on the α-diversity of plants in shrub layer. (2) The spatial distribution of plant community species around FAST was most influenced by the altitude, followed by the slope. (P<0.05) (3) The β-diversity indices of the plant communities around FAST show a trend of vine layer > shrub layer > tree layer along the altitude and slope. The Jaccard similarity index above 70% is extremely dissimilar and moderately dissimilar at altitude and slope gradients. The Jaccard similarity index of the three plant communities tended to increase with altitude and then decrease along the slope. In summary, species differ in their habitat selection, and altitude and slope are key factors affecting the spatial distribution of plant communities in the Karst depressions around FAST. Species diversity can better reflect the differences in plant communities in terms of species composition. Species diversity is not only influenced by topographic factors, but also related to biotic and abiotic factors, such as temperature, precipitation, human activities, and functional plant traits. Therefore, corresponding environmental factors need to be added in future studies to further investigate the intrinsic mechanisms of plant species diversity and species spatial distribution at the regional scale and to strengthen the ecological protection of the surrounding area, improve the forest composition, and provide a good natural environment around FAST and in the Karst peak-cluster depression.
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