Subjects: Nursing >> Nursing submitted time 2023-09-30
Abstract： The nursing care of a patient with membranous nephropathy complicated with acute myocardial infarction and lower extremity arterial embolism was reported. Patients with membranous nephropathy are prone to hypercoagulation, which is a risk factor for lower limb arterial thrombosis. In this case, the patient can get the best treatment and reduce the complications by giving quality care throughout the whole process. This nursing measure is worthy of clinical application.
Peer Review Status:
Awaiting Review
Subjects: Psychology >> Applied Psychology submitted time 2023-09-30
Abstract： There are many factors influencing prosocial behavior, and the research results of "who is more prosocial in high social class or low social class" are different, and the research conclusions are easy to generate group stigma, so further clarifying how social class affects prosocial tendency has become a research hotspot. Previous studies mainly discuss the effect of self-induced social status from the perspective of prosociety. However, by subdividing subjective social class into subjective family class and subjective individual class, the relationship between subjective social class and prosocial tendencies may be better explained. In addition, reciprocity beliefs, as the ideological and cognitive aspect of an individual's internal reciprocity norm, is a remote factor that determines the actual reciprocity behavior, and was also introduced into the prediction mechanism to better explain the relationship between subjective social class and prosocial tendencies.
Study 1 recruited college students through an online platform with 598 valid participants, and used the MacArthur Scale of Subjective, the Prosocial Tendencies Measures, the Personal Norms of Reciprocity Scale, and the Personal Relative Deprivation Scale to measure individuals' subjective family class, subjective individual class, prosocial tendency, reciprocity belief, and individual relative deprivation. SPSS process was used to conduct chain multiple mediation tests and moderating effect tests. Results found that subjective family class can positively predict subjective individual class and prosocial tendency, and subjective individual class can negatively predict balanced reciprocity belief. Balanced reciprocity belief positively predicted prosocial tendency, in which balanced reciprocity belief played an intermediary role between subjective family class and prosocial tendency, subjective individual class and balanced reciprocity belief had a masking effect between them, and individual relative deprivation played an enhanced moderating role between reciprocal belief and prosocial tendency; In study 2, CGSS2021 data was used to further verify the results of study 1 by selecting variables related items, 2312 valid data were obtained after deleting missing data, and the same model test was conducted by SPSS process. Results found that both subjective family class and subjective individual class can positively predict prosocial tendency, subjective family class can still positively predict subjective individual class, subjective individual class negatively predicted negative reciprocity belief, negative reciprocity belief negatively predicted prosocial tendency, and subjective individual class played a mediating role between subjective family class and prosocial tendency.Subjective individual class and negative reciprocity belief played an intermediary role between them, and there were boundary conditions on the direct effect of individual relative deprivation. Combining the results of the two studies, it can be stably found that subjective family class can positively predict prosocial tendencies, which provided new evidence for "higher subjective social class has higher prosocial tendencies".Subjective family class is the antecedent influencing factor of subjective individual class, which can predict reciprocity belief and then prosocial tendency through the latter. Subjective individual class and reciprocity belief are important mechanisms for subjective family class to predict prosocial tendency, but different reciprocity beliefs play different roles in predicting prosocial tendency.
Whether it is the relationship between subjective family class and subjective individual class, the different predictive effects of different reciprocity beliefs on prosocial tendency, or the chain mediating effects of subjective individual class and reciprocity beliefs on subjective family class and prosocial tendency. These stable findings can help to understand subjective social class and its prediction mechanism for prosocial tendency, provide a new perspective for understanding the relationship between subjective social class and prosocial tendency, and show that social cognitive theory and social exchange theory are not incompatible in explaining prosocial tendency, and can better understand individual prosocial tendency by combining them.
Peer Review Status:Awaiting Review
Subjects: Nursing >> Nursing submitted time 2023-09-30
Abstract：总结1例感染鼠伤寒沙门菌伴呕吐患者的护理，严密观察患者的病情变化，做好消化道隔离、呕吐护理、心理护理、饮食护理等护理照护。通过积极有效的护理措施，患者病情得到有效控制。
Peer Review Status:Awaiting Review
Subjects: Management Science >> Other Disciplines of Management Science submitted time 2023-09-29
Abstract： Building an emergency public event archive information service platform has a very important position in the construction of emergency decision-making capability system in China. This article uses literature research and system planning methods to analyze the construction requirements and current situation of the emergency public event archives information service platform. On this basis, from the three aspects of system function analysis, system architecture design, and system construction promotion mechanism, the idea of constructing a public emergency archive information service platform is proposed, in order to explore a feasible path for the construction of archive information service platform, give full play to the value of archives serving national emergency management, improve decision-making efficiency, and promote cross-departmental utilization and cross-regional sharing of archive information resources for public emergencies.
Peer Review Status:Awaiting Review
Subjects: Physics >> Nuclear Physics Subjects: Mathematics >> Computational Mathematics. submitted time 2023-09-29
Abstract： Machine learning-based modeling of reactor physics problems has attracted increasing interest in recent years.
Despite some progress in one-dimensional problems, there is still a paucity of benchmark studies that are easy
to solve using traditional numerical methods albeit still challenging using neural networks for a wide range
of practical problems. We present two networks, namely the Generalized Inverse Power Method Neural Net#2;
work (GIPMNN) and Physics-Constrained GIPMNN (PC-GIPIMNN) to solve K-eigenvalue problems in neu#2;
tron diffusion theory. GIPMNN follows the main idea of the inverse power method and determines the lowest
eigenvalue using an iterative method. The PC-GIPMNN additionally enforces conservative interface condi#2;
tions for the neutron flux. Meanwhile, Deep Ritz Method (DRM) directly solves the smallest eigenvalue by
minimizing the eigenvalue in Rayleigh quotient form. A comprehensive study was conducted using GIPMNN,
PC-GIPMNN, and DRM to solve problems of complex spatial geometry with variant material domains from
the field of nuclear reactor physics. The methods were compared with the standard finite element method. The
applicability and accuracy of the methods are reported and indicate that PC-GIPMNN outperforms GIPMNN
and DRM.
Subjects: Medicine, Pharmacy >> Clinical Medicine submitted time 2023-09-28
Song, Xiaochen
Zhang, Hui
Zhong, Sen
Tan, Xianjie
Ma, Shuiqing
Jin, Ying
Pan, Lingya
Wu, Ming
Cao, Dongyan
Yang, Jiaxin
Xiang, Yang
Abstract： Objective: The current treatment for early-stage neuroendocrine carcinoma of the cervix (NECC) mainly relies on radical hysterectomy and chemotherapy. The routine use of postoperative radiation is still in controversial. We want to evaluate the value of postoperative radiation in early-stage NECC.
Methods: A retrospective cohort study. Early-stage NECC patients from 2006 to 2022 in Peking Union Medical College Hospital were included. Depending on whether the patients received radiation therapy after surgery, they were divided into Postoperative non-radiation group (Group A) and Postoperative radiation group (Group B). We use Kaplan-Meier method to analyze the progression-free survival (PFS), overall survival (OS), recurrence and OS rate.
Results: Sixty-six cases were included, 32 (48.5%) in Group A and 34 (51.5%) in Group B. After 35 (range 12-116) months follow-up, 26 (39.4%) experienced recurrence. Compared with Group A, Group B had lower pelvic recurrence rate (12.5% vs 2.9%, p = 0.142), slightly higher distant recurrence rate (28.1% vs 44.1%, p = 0.177), and similar mortality rate (29.4% vs 31.3%, p = 0.871). Cervical stromal invasion ≥1/2 was more common in Group B (28.0% vs 63.0%, p = 0.012). Postoperative radiation in patients with cervical stromal invasion ≥1/2 showed an extended trend in PFS (33.9 months vs 47.9 months) and OS (40.7 months vs 70.0 months) but without statistical difference (p = 0.963, p = 0.636). Lymph-vascular space invasion (LVSI) is a high-risk factor for tumor recurrence (HR 9.13, p = 0.005), but radiation after surgery did not improve the PFS (51.5 months vs 48.8 months, p = 0.942) and OS (53.9 months vs 60.6 months, p = 0.715) in patients with LVSI.
Limitations: The limitations of this study are the retrospective nature and relative small sample size.
Conclusions: Postoperative radiation seems to prolong PFS and OS in patients with cervical stromal invasion ≥1/2. LVSI was a high-risk factor for tumor recurrence, but radiation after surgery in patients with LVSI seems have no survival benefits.
Dispute
Dispute
Subjects: Library Science，Information Science >> Library Science submitted time 2023-09-28
Abstract： This article aims to share experiences on curriculum teaching and graduate development. Firstly, the first three paragraphs of this article introduce the original intention, challenges, and six methods of preparing for the course "Research on Information Users and Services". Secondly, the fourth paragraph explains how to choose the most suitable form of expression based on the teaching purpose. The fifth paragraph reflects on the ideological and political content and practical plan of the course. The sixth and seventh paragraphs aim to provide methods and precautions to arouse students' enthusiasm. The eighth and ninth paragraphs elaborate on the ways for teachers and students to get along and their respective responsibilities. Finally, three interesting experiences of mutual learning and teaching were shared. Through sharing these experiences, it is hoped that useful case studies can be provided for course teaching and graduate cultivation, promoting the improvement of educational quality and the development of academic research.
Peer Review Status:Awaiting Review
Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2023-09-28
Chang, Zhengyao
Li, Jiyang
Zhang, Chao
Gao, Yunhe
Liang, Wenquan
Pan, Heng
Zhang, Kecheng
Cui, Jianxin
Wei, Bo
Chen,Lin
Xi,Hongqing
Abstract： Objective: Liver metastasis is one of the major causes of cancer-related death in gastric cancer (GC) patients. This study was to investigate the roles of THBS2 in the tumorigenesis and liver metastasis of GC and the sensitivity of GC to trastuzumab.
Methods: Sequencing was employed to identify the differentially expressed genes in the GC. The THBS2 expression was detected in GC tissues and GC cell lines, its relationships with clinicopathological characteristics were further assessed, and its roles in the malignant behaviors of GC were further investigated in vitro and in vivo, by up-regulating or down-regulating THBS2 expression. The PTEN and its downstream AKT and FAK signaling pathways were investigated in the GC aiming to explore the potential mechanism underlying the regulatory effects of THBS2.
Results: THBS2 expression increased significantly in the GC as compared to the normal gastric tissues, which was related to the distal metastasis and poor prognosis of GC patients. THBS2 expression also increased in the primary GC cells and human gastric cell line NCI-N87. THBS2 downregulation induced mesenchymal-epithelial transition (MET) and PTEN nuclear translocation, which inhibited the metastasis of GC cells. Carmofur promoted PTEN nuclear translocation, inhibiting the metastases and THBS2 downregulation together with carmofur improved the sensitivity of GC to trastuzumab.
Conclusions: THBS2 is overexpressed in GC tissues of patients with synchronous liver metastases and its overexpression is associated with poor prognosis. THBS2 downregulation inhibits the metastases of GC. THBS2 down-regulation and carmofur can be used as a new treatment for the advanced GC with metastases.
Peer Review Status:Awaiting Review
Subjects: Management Science >> Management Engineering submitted time 2023-09-28
Abstract： The big data analysis and application, covers five challenges including the computing infrastructure, the data management practices, the researcher preferences, the various collaboration opportunities and the cost obscured by technology. This article proposes some feasible practical suggestions to address these issues as (1) establishing open scientific platforms and data warehouses to facilitate data sharing and communication; (2) strengthening cross-disciplinary collaboration mechanisms and encouraging experts from different fields to participate in data analysis and research; (3) developing clear codes of conduct and specifications to ensure data quality and privacy protection; (4) utilizing cloud computing technologies and automation tools to improve the efficiency of data processing and analysis; (5) investing in education in the field of big data, cultivating more talents, and improving the technical level of the entire industry.
Peer Review Status:Awaiting Review
Subjects: Psychology >> Educational Psychology submitted time 2023-09-27
Abstract： Reading is important for children’s future academic success. Clarifying the mechanisms underlying reading ability has been a heated issue in reading research for decades. Most previous studies have focused solely on reading comprehension but scarcely paid attention to the mechanisms underlying reading fluency throughout elementary school. Reading fluency at the text level has been acknowledged as one of the indicators of children’s overall reading competence. Therefore, the present study aimed to clarify the shareability and specificity of the mechanisms underlying Chinese children’s reading comprehension and reading fluency across different developmental stages.
We recruited a total of 416 Chinese children in grades 2, 4 and 6 (lower, middle and upper stages) of elementary school and were then followed up for half a year. In the fall semester (Time 1), a series of tasks, including general cognitive ability; working memory; phonological, orthographic and morphological awareness; rapid automatized naming (RAN); word recognition accuracy; word recognition fluency and vocabulary knowledge, were administered. In the second or spring semester (Time 2), reading comprehension and reading fluency were administered. Three mediation models were fitted to the data with T1 morphological awareness and RAN as predictors, T1 word recognition accuracy, word recognition fluency, and vocabulary knowledge as mediators and T2 reading comprehension and reading fluency as outcomes. The remaining variables were controlled in all the three models.
Results indicated that morphological awareness and RAN significantly predicted reading comprehension and reading fluency at T2 via word recognition accuracy among children in the lower stage after controlling for the effects of T1 general cognitive ability, T1 working memory and T1 phonological and orthographic awareness. The mediating effect of T1 word recognition fluency in the contribution of T1 RAN to T2 reading fluency was also significant. However, in the middle and upper stages, the indirect effects of T1 morphological awareness and T1 RAN on T2 reading comprehension were not significant; for T2 reading fluency, the mediating role of T1 word recognition accuracy in the effect of T1 morphological awareness was significant in both stages, but the mediated role of T1 word recognition fluency was only significant in the middle stage. Moreover, T1 RAN contributed to it via T1 word recognition accuracy and fluency.
These findings attest to both the shareability and specificity in the mechanisms underlying reading comprehension and reading fluency across different developmental stages. These findings suggest that reading fluency should be incorporated as a legitimate index of children’s reading ability. They further imply that the developmental stages require consideration when exploring the mechanisms underlying the effects of morphological awareness and RAN on reading abilities (comprehension and fluency). This study provides empirical evidence for understanding the science of reading development among Chinese children and has important implications for future reading research and educational intervention.
Subjects: Geosciences >> Geography submitted time 2023-09-27 Cooperative journals: 《干旱区地理》
Abstract：为了探究旅游涉入度、恢复性环境感知和游客满意度对重游意愿的影响及消费预期的调节作用，以吐鲁番市乡村旅游为切入点，采用结构方程模型，将游客满意度和恢复性环境感知作为中介变量，消费预期作为调节变量，探究旅游涉入度与重游意愿两者间存在的作用机制。结果表明：（1） 旅游涉入度对恢复性环境感知、游客满意度和重游意愿产生显著正向影响，其中对恢复性环境感知的影响效应最大，对游客满意度的影响效应最小。（2） 恢复性环境感知和游客满意度在旅游涉入度-重游意愿的结构中有多重链式中介作用。（3） 旅游涉入度、游客满意度对重游意愿的影响受消费预期的正调节。研究结果可为提高吐鲁番市游客乡村旅游的重游意愿提供新思路，对当地旅游开发与管理具有一定的指导意义。
Subjects: Geosciences >> Geography submitted time 2023-09-27 Cooperative journals: 《干旱区地理》
Abstract：区域空间格局及其形成机制对制定空间发展战略具有理论意义。以甘肃省为例，根据2000、2010年和2020年甘肃省统计资料，运用引力模型和断裂点模型识别区域空间格局，基于地理探测器分析形成机制，进而提出空间发展战略。结果表明：甘肃省空间格局分别为河西走廊一体化发展区、陇中同城化发展区和陇东南协同发展区三大分区。区域空间格局形成的演化机制因地理尺度的差异而不同，20002020年人口发展和经济水平对区域空间格局的形成一直发挥着基础性作用，政策调控则发挥着关键性作用，因子间的共同交互作用推动甘肃省空间格局的形成。从三大分区层面提出河西走廊一体化发展区形成一轴、四圈、陇中同城化发展区形成一核牵引、五极并进、陇东南协同发展区形成四极平行发展的新发展空间思路；省域层面提出手指形高质量空间发展战略，促使甘肃省由增长极模式和点-轴模式的发展阶段转向区域网络极核模式。
Subjects: Geosciences >> Geography submitted time 2023-09-27 Cooperative journals: 《干旱区地理》
Abstract：明晰长时间尺度上贫困时空动态特征和驱动因素，能为接续推进相对贫困治理和乡村全面振兴提供有益借鉴。基于19862020年经济社会面板数据，以农民人均纯收入为表征，考察甘肃省六盘山片区近35 a贫困的时空演变，运用动态空间面板模型解析驱动因素的长短期效应和空间溢出效应差异。结果表明：（1） 甘肃省六盘山片区大部分县区农民人均纯收入增速有提高趋势，这一趋势未来仍会持续。（2） 28个县区收入增速在1994年或2007年存在结构性突变点，这与八七扶贫攻坚计划、农村税费改革和城乡基本公共服务均等化、快速城镇化等宏观因素有关。（3） 时间上低收入县区很难跨入高收入县区，空间上热点和冷点区域分布相对稳定，农民人均纯收入存在显著的时空依赖，但程度因空间溢出效应而减轻。（4） 长期和短期来看，经济增长、产业结构和城镇化对本地和相邻县区农民人均纯收入有显著影响，是空间溢出效应的主要来源；仅短期来说，人力资本、种植结构、交通设施对本地和更大空间范围上农民人均纯收入具有显著影响；降雨量具有长期正向影响，意味着西北地区暖湿化趋势是一个重要利好。鉴于时空上贫困的强稳定性和驱动因素作用的差异性，原连片特困地区相对贫困治理需要系统考虑政策措施的时空协调性。
Subjects: Geosciences >> Geography submitted time 2023-09-27 Cooperative journals: 《干旱区地理》
Abstract：爱国主义教育基地是加强爱国教育、传承红色基因的重要场所。以黄河流域171个国家级爱国主义教育基地为研究对象，综合运用地理空间分析方法揭示了爱国主义教育基地的空间分布格局，并利用地理探测器工具测度了其影响因素。结果表明：（1） 黄河流域爱国主义教育基地类型结构不均衡，革命传统教育类占比最高，建设成就标志类占比最低。（2） 区域上整体呈集聚型分布，数量差异明显，表现为上游多中游少，川豫多青宁少的特征。（3） 核密度呈现以延安市为核心、4个高密度区和2个次高密度区的氺字型分布格局。（4） 冷热极化显著，主要以冷点区分布为主，热点区集中于黄河中上游的陕西省、甘肃省和宁夏回族自治区交界的8个城市。（5） 文化环境、人口规模和交通水平是影响黄河流域爱国主义教育基地空间格局的强势因素，其中红色旅游资源、文化场馆、人口密度、举办活动、参观人次、客运量是核心影响因子。研究结果可为黄河流域爱国主义教育基地空间布局优化和助推黄河红色文化高质量发展提供参考依据。
Subjects: Geosciences >> Geography submitted time 2023-09-27 Cooperative journals: 《干旱区地理》
Abstract：利用多行业金融机构的地理分布数据，运用社会网络分析方法对中国金融网络进行测度，借助地理探测器模型探讨中国金融网络空间结构形成的影响因素。结果表明：（1） 金融网络呈现核心-边缘结构特征，但是金融网络的空间分异程度在缩小。另外，金融网络空间结构具有空间指向性。（2） 影响全国、东部、中西部、核心和边缘地位金融网络发育的因子不同，这与不同区域经济发展水平、市场潜力、关键资源、区位条件和经营成本等不同紧密相关。（3） 择优选择、路径依赖和网络邻近机制是金融网络空间结构形成所遵循的内在机理，在未来经济金融日趋融合的大背景下，各级政府需进一步在更大尺度上加强城市之间在金融方面的合作。通过研究中国金融网络空间结构特征及其影响因素，既可以为优化金融资源配置提供政策建议，也可以为推动城市间协调发展的政策制定提供科学依据。
Subjects: Geosciences >> Geography submitted time 2023-09-27 Cooperative journals: 《干旱区地理》
Abstract：提升城市生态韧性和生态效率，促进二者间协同发展是实现黄河流域生态治理的重要目标。以黄河流域57个城市为研究靶区，运用加权求和法、SBM模型研究了20092018年黄河流域生态韧性与效率时空演化特征，并运用耦合协调模型分析了流域城市生态韧性与效率的协调发展关系。结果表明：（1） 20092018年，黄河流域城市生态韧性总体上处于波动下降态势，面临较大的生态威胁和环保压力。西安市、郑州市和济南市3个省会城市生态韧性较高，而固原市、定西市、海东市、吕梁市等城市韧性较低。（2） 黄河流域城市生态效率呈先降后升高的U形演化特征。定西市、陇南市、庆阳市、鄂尔多斯市、固原市和洛阳市为生态效率高等类型，生态效率低等类型主要位于中、下游的山西省、河南省和山东省内的城市。（3） 生态韧性与效率协调关系与生态效率子系统相似，由不断下滑转向逐步回升。良好协调、中度协调型城市数量有所增加，勉强协调型城市有所减少，黄河流域城市生态韧性与效率协调发展势头显现，但短期内经济发展与环境保护间的矛盾仍较突出。研究结果可为黄河流域城市生态政策制定、生态韧性和效率提高提供理论参考。
Subjects: Geosciences >> Geography submitted time 2023-09-27 Cooperative journals: 《干旱区地理》
Abstract：山南宽谷流域是雅鲁藏布江主要宽谷之一，特殊的地理环境致使该流域既是严重的土地沙化生态脆弱区，也是重要的沿江经济发展带，构建合理的生态安全格局可为未来生态功能提升与经济发展提供依据参考。以山南宽谷流域为研究对象，基于生态系统服务价值和生态敏感性评价，识别出生态源地，利用最小累积阻力值确定了生态安全区并识别生态廊道，构建山南宽谷流域2020年生态安全格局。结果表明：（1） 山南宽谷流域生态源地面积为1089.68 km2，主要分布于贡嘎县、扎囊县和乃东区内的草场和林区。（2） 在山南宽谷流域内建立了高、较高、中等、较低、低水平生态安全区，分别占流域总面积的24.74%、51.24%、10.31%、5.43%、8.28%，不同生态安全区应采取不同的措施以保证生态环境的安全。（3） 识别出总长4720.08 km的105条生态廊道，与生态源地、生源点和生态安全区共同构成山南宽谷流域生态安全格局。（4） 结合土地利用现状建议山南宽谷流域南岸进行适度产业开发，北岸以生态保护为主，并提出构建一地一场两区四园的发展格局。
Subjects: Geosciences >> Geography submitted time 2023-09-27 Cooperative journals: 《干旱区地理》
Abstract：从种植业和畜牧业两方面入手，采用排放因子法对甘肃省20002020年农业碳排放进行了估算，分析了其时空变化特征，基于STIRPAT（Stochastic impacts by regression on PAT）模型探析了甘肃省农业碳排放的影响因素，并提出了相应对策。结果表明：（1） 甘肃省20002020年CO2-e排放量呈升高-降低-升高的趋势，2015年达到峰值，估算为2320.41104 t；从2018年开始又逐年增加，直至2020年增至2290.69104 t。（2） 甘肃省农业CO2-e排放结构中，种植业占35%，畜牧业占65%。主要碳排放源中，畜禽胃肠道发酵对农业碳排放总量的贡献最大，其次是化肥和畜禽粪便管理。主要畜禽中，肉牛养殖对碳排放的贡献最大，其次是绵羊、山羊、奶牛和猪，家禽养殖的贡献最小。（3） 农村人口、农村居民人均GDP、农村居民人均可支配收入、农业机械总动力、农业增加值占全省生产总值比重、农村住户固定资产投资额、农业科技成果应用数量、农业科技投入是影响甘肃省农业碳排放的主要因素，影响力指数分别为-0.017、0.026、0.020、0.038、-0.025、0.031、-0.017、0.016。为有效控制农业碳排放，建议在5个方面采取相应策略：努力提高种植业资源利用效率和土壤碳汇能力；强化畜牧业源头减量、过程控制和末端处理；努力降低农业机械对石油的依赖；有效推动农村清洁能源利用；加大农业低碳技术的研发与应用。
Subjects: Geosciences >> Cartography submitted time 2023-09-27 Cooperative journals: 《干旱区地理》
Abstract：中国山西-陕西-内蒙古交界地开采沉陷对地表土壤扰动强烈，引起地表生态损伤。为了揭示开采沉陷对土壤水盐运移的影响机制，通过建立土壤沉陷物理模型，利用沉陷剖面不同应力区土壤容重数据建立HYDRUS-2D水盐模型，研究土壤蒸发过程中，土壤水分、总盐分、不同溶质离子在不同沉陷应力区随土壤深度和运移时间的变化规律。结果表明：（1） 0~40 cm深度，沉陷拉张作用显著增强土壤蒸发作用，造成挤压区土壤含水率显著大于拉张区，土壤含水率随时间变化曲线呈现典型的蒸发过程三阶段模式。（2） 沉陷组各应力区土壤总含盐量不但随深度呈现强烈变异，具体表现为20~40 cm、60~80 cm土壤总含盐量相对积聚；而且右侧拉张区总含盐量积聚深度有向下迁移的趋势。（3） 沉陷拉张区Ca2+、SO42-、Mg2+、Cl-离子积聚浓度大于挤压区。Ca2+、SO42-、CO32-土壤离子浓度随深度呈单峰积聚，沉陷拉张区积聚深度均显著下移。（4） HYDRUS-2D水盐模型可以较好地模拟开采沉陷土壤剖面中的土壤水盐运移。土壤含盐量、含水率的实测值与模拟值率定结果为平均相对误差（ME）0.5，均方根误差（RMSE）0.5，决定系数（R2）>0.95，模拟精度满足试验要求。研究结果可为科学开展开采沉陷区生态修复工程、提高生态自修复能力提供重要理论依据。
Subjects: Geosciences >> Geology submitted time 2023-09-27 Cooperative journals: 《干旱区地理》
Abstract：覆盖会影响尾矿水、热分布，研究植物纤维毯覆盖对尾矿砂水热分布的影响，对微生物诱导碳酸钙沉淀（Microbial induced calcite precipitation，MICP）技术控制尾矿污染扩散过程中调控水热条件具有实际意义。于2022年夏季在中国科学院新疆生态与地理研究所莫索湾沙漠研究站，布设基于不同材料（黄麻、稻草、椰丝和棕榈）、不同规格（300 gm-2、500 gm-2、700 gm-2和900 gm-2）的植物纤维毯覆盖于尾矿砂的田间模拟试验，通过测定尾矿砂温度、含水率与蒸发量变化，探究植物纤维毯覆盖对尾矿砂水热分布的影响。结果表明：（1） 植物纤维毯覆盖能降低0~20 cm尾矿砂温度、减小日温差及日变化幅度，其中900 gm-2的稻草纤维毯（D9）降温作用最强，日变化幅度最小。（2） 植物纤维毯覆盖能改善0~30 cm尾矿砂的保水性，减少水分蒸发损失。（3） 植物纤维毯覆盖能抑制尾矿砂水分蒸发，试验结束时，相同规格下累积蒸发抑制效率除D9略大于900 gm-2的黄麻纤维毯（H9）外，均表现为：黄麻>稻草>棕榈>椰丝，且均随规格增大而增大，其中D9抑制蒸发效率高达71.3%。（4） 植物纤维毯覆盖干旱区尾矿砂的最佳节水降温方案为D9。综上所述，植物纤维毯覆盖能有效节水降温，研究结果可为干旱区应用MICP技术控制尾矿污染扩散过程中调控水热条件提供理论支撑。
Hits
Hits
Downloads
Comment
YES