Subjects: Biology >> Ecology submitted time 2017-03-22 Cooperative journals: 《生态学报》
Abstract：辽东栎是黄龙山林区主要的建群种，通过典型取样选择16块样地，对其年龄结构、静态生命表、存活曲线、高度级结构、冠幅结构的绘制，研究其在不同郁闭度（0.6、0.7、0.8、0.9）不同坡向（阴坡、阳坡）生境中变化规律。结果表明：辽东栎幼苗数量在郁闭度0.6、0.7、0.8、0.9样地中，分别占全部个体数量的57%、64%、36%、47%，从年龄结构、静态生命表、存活曲线均表明辽东栎幼苗在4个不同郁闭度中比例都是最大的，大树比例次之，幼树小树比例最少，幼树小树是辽东栎更新瓶颈阶段，辽东栎种群存活曲线均属于R.PearlⅢ型，在郁闭度0.7波动最小；从辽东栎种群的年龄结构、静态生命表、存活曲线、高度级结构、冠幅结构等指标综合表现中可以看出辽东栎种群在郁闭度0.7生境优于郁闭度0.6、0.8、0.9生境；辽东栎在阳坡的幼苗、幼树、小树、比例高于阴坡，而大树比例低于阴坡；除高度级a外，阳坡多集中在c、d、e高度级，阴坡高度级多集中在d、e、f；在阳坡冠幅级⑩以下均有分布，在阴坡冠幅多集中在冠幅级⑦以下；无论在阳坡还是阴坡，郁闭度0.7更适合辽东栎更新生长，可以作为西北地区抚育间伐的理想条件。
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Plant Protection submitted time 2018-06-22 Cooperative journals: 《广西植物》
Abstract： Cyclobalanopsis glauca is one of the constructive species and dominant species in subtropical evergreen broad-leaved forest. Cyclobalanopsis glauca is the dominant species too in karst forest of Maolan National Reserve and plays an important role in the ecosystem. In order to reveal population dynamics of Cyclobalanopsis glauca, Cyclobalanopsis glauca of different topography sites (Funnel, Hillside, Valley) in Maolan National Reserve were selected as the object of research. The population structure was studied by the method of tree class structure instead of age structure, and survival curves of Cyclobalanopsis glauca was drawn.
Subjects: Biology >> Botany submitted time 2023-08-26 Cooperative journals: 《干旱区研究》
Abstract： This study focused on the natural Juniperus rigida population in the loess hilly region of InnerMongolia. The structure and dynamic changes of the population were analyzed using a static life table, survivalfunction, dynamic quantitative analysis, and time series model. The results showed that the population mainlycomprised many individual seedlings, followed by medium and less mature trees. Combined with the dynamicchange index Vpi > 0, the population was a growth type. The survival curve was verified using the curve modeland tended to Deevey-II, indicating that the mortality rate of each age class was stable. Considering the externalinterference, the dynamic index tended to 0, and the population growth is not obvious under the interferencecondition. In the survival function analysis, the population showed a strong survival trend in the early stage,followed by a gradual decline in the middle stage. During the 2-to-8-year period, the number of seedlingsdecreased while middle- aged and adult trees increased. The seedling stage is crucial to the regeneration anddevelopment of the population. Therefore, implementing scientific protection measures for seedlings to promotepopulation regeneration is recommended. Research on the internal mechanisms of the Juniperus rigidapopulation can enrich vegetation construction in arid areas, provide a reference for population management, andprovide a theoretical basis for vegetation protection and restoration in the loess hilly area.
Subjects: Biology >> Botany submitted time 2023-08-26 Cooperative journals: 《干旱区研究》
Abstract： This study focused on the natural Juniperus rigida population in the loess hilly region of InnerMongolia. The structure and dynamic changes of the population were analyzed using a static life table, survivalfunction, dynamic quantitative analysis, and time series model. The results showed that the population mainlycomprised many individual seedlings, followed by medium and less mature trees. Combined with the dynamicchange index Vpi > 0, the population was a growth type. The survival curve was verified using the curve modeland tended to Deevey-II, indicating that the mortality rate of each age class was stable. Considering the externalinterference, the dynamic index tended to 0, and the population growth is not obvious under the interferencecondition. In the survival function analysis, the population showed a strong survival trend in the early stage,followed by a gradual decline in the middle stage. During the 2-to-8-year period, the number of seedlingsdecreased while middle- aged and adult trees increased. The seedling stage is crucial to the regeneration anddevelopment of the population. Therefore, implementing scientific protection measures for seedlings to promotepopulation regeneration is recommended. Research on the internal mechanisms of the Juniperus rigidapopulation can enrich vegetation construction in arid areas, provide a reference for population management, andprovide a theoretical basis for vegetation protection and restoration in the loess hilly area.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-07-20 Cooperative journals: 《广西植物》
Abstract： To explore the impact of Chimonobambusa utilis management on species diversity and dominant populations structure of Castanopsis platyacantha community in Jinfo Mountain, the natural and the managed community of Castanopsis platyacantha in Jinfo Mountain were used as the research object to analyze species composition characteristics, species diversity and dominant populations structure in two communities. The results were as follows: (1) A total of 84 vascular plants in the plots were found, belonging to 40 families and 63 genera, dominated by Lauraceae, Rosaceae, Fagaceae and Theaceae; Castanopsis platyacantha was the dominant species in the community, Schima sinensis and Lithocarpus henryi were the subordinates and Chimonobambusa utilis was the dominant species in the shrub layer, which the species composition of Castanopsis platyacantha community in Jinfo Mountain was similar to other subtropical regions. (2) The species richness of the shrub layer of the managed community was significantly lower than that of the natural community, the Shannon-wiener index and Pielou index of the herb layer was significantly lower than that of the natural community. (3) Dominant tree species Castanopsis platyacantha and Lithocarpus henryi in the natural community were of stable populations, but those were of declining populations in the managed community, and Schima sinensis in two communities appeared to be in decline. (4) The ratio of total sprouts to total individuals, number of multi-stemmed individuals/number of all individuals and seedling relative dominance value of Castanopsis platyacantha, Schima sinensis and Lithocarpus henryi in the natural community were higher than in the management community. In conclusion, the Chimonobambusa utilis management have a negative impact on the species diversity with the strongest on the shrub and herb layers of Castanopsis platyacantha community in Jinfo Mountain, indicating managed activities significantly affect the renewal and maintenance of the dominant species in Castanopsis platyacantha community.
Subjects: Biology >> Botany >> Applied botany submitted time 2020-08-03 Cooperative journals: 《广西植物》
Abstract：鸭脚木（Schefflera octophylla）是海南文昌铜鼓岭国家级自然保护内滨海森林的优势种，也是海南其它地区热带森林常见伴生种。为了深入了解该区滨海森林内鸭脚木种群的生存现状、更新机制以及未来发展的动态变化特点，该研究通过对海南热带滨海森林 2.56 hm2 样地中鸭脚木种群的调查，以径级结构代替年龄结构，编制鸭脚木种群静态生命表，并结合种群动态量化指数、生存函数、时间序列预测模型等方法定量分析鸭脚木种群结构和数量动态变化。结果显示：（1）研究区域内记录鸭脚木数量 2814 株，按照径级大小共划分为 12 个龄级，龄级结构呈倒 J 字型，属于趋向稳定型种群。（2）该区鸭脚木的存活曲线趋于 Deevey-II 型，种群各径级的死亡率相接近。（3）鸭脚木种群的量化指数显示：Vpi=030.685>0，Vpi’=0.236>0，说明该种群现处增长阶段并且相对稳定。（4）据时间序列模型预测：鸭脚木种群在未来 3、6、9 年内各龄级的种群个体数量整体呈现增加的趋势。经本次调查分析表明，该区生境有利于鸭脚木种群的生长且该种群形成了良好的生存策略，其幼龄个体较多且后备资源丰富，能够较好地补充各龄级个体自然死亡造成的损失，对森林的天然更新起到一定促进作用。
Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-13 Cooperative journals: 《广西植物》
Abstract： Ormosia hosiei is a rare and endangered plant that is narrowly distributed in South China, with important economic and humanistic values. In order to find out its survival status and the reasons that restrict its development, we investigated the natural populations of O. hosiei in four regions of Guizhou and Sichuan provinces, according to the distributive characteristics of different populations, we set up two 20 m ×20 m for each population by using the method of plot investigation and conducted a community survey in each plot. The structural characteristics of O. hosiei populations were analyzed by establishing static life tables and drawing populations survival curves. Four survival functions, number dynamic index, and time series analysis were used to describe survival status. The results were as follows：（1）The age-class structure of O. hosiei populations were in the shape of“J”at Hezhu Village and Ganerpan Village, in the shape of “Dumbbell”at Chenjiawan Village and Rongchun Village, the populations has strong natural renewal ability, but middle-aged individuals are easily missing;（2）The populations belonged to the increasing type, the survival curves of 4 populations are close to Deevey- Ⅱ type, the disappearance rate and mortality rate of O. hosiei populations showed a "Multimodal" pattern in Hezhu Village, Chenjiawan Village and Rongchun Village, indicating that the populations are susceptible to external disturbances in the early and middle period（; 3）All O. hosiei populations in different regions appeared to decrease in the early stage and keep dynamically stable in the medium-late stage, and the formation reasons were related to the topographic characteristics of mountainous areas and the seed dispersal characteristics of O. hosiei;（4）RDA analysis showed that altitude and slope were the dominant factors affecting the populations structure of young individuals, and interference intensity was the main factor affecting the number structure of older individuals. As a result, the structural characteristics of O. hosiei populations in different regions are restricted by the topographic characteristics, the reproductive characteristics and the environmental pressure. By controlling the density of young individuals and managing the growth space of middle-aged individuals, we can increase the survival rate of the seedlings and promote the healthy growth of middle-aged individuals, to maintain the stability of the natural populations of O. hosiei.
Subjects: Biology >> Zoology submitted time 2017-10-23 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在应用高通量测序技术研究川中黑山羊瘤胃纤毛虫种群结构。选取3只4月龄川中黑山羊[体重（15.53±0.21） kg]，正常饲喂20 d后采集瘤胃液（A）样品，间隔40 d后再次采集瘤胃液（F）样品，提取样品总DNA后，扩增真核生物18S rRNA V4区，扩增产物使用Illumina MiSeq平台测序。结果表明：1）共获得高质量有效序列242 321条，聚类后得1 650个运算分类单位(OTU)。2）A样品、F样品在alpha多样性Chao、ACE、Shannon和Simpson指数上，差异不显著（P＞0.05）。3）在纲水平分类上，2个时间点样品相对丰度最高的均为纤毛门，侧口纲（A样品为46.0%；F样品为44.7%），2个样品的相对丰度差异不显著（P＞0.05）。4）在科水平分类上，A样品优势科为头毛科（31.8%），其次为均毛科（14.2%）；F样品优势科为头毛科（42.8%）；并且F样品头毛科相对丰度显著高于A样品（P<0.05），A样品均毛科相对丰度显著高于F样品（P<0.05）。5）在属水平分类上，A样品与F样品相对丰度最高的纤毛虫属均为多加多泡双毛属（A样品为20.9%、F样品为25.4%），无显著差异（P＞0.05）；存在显著性差异的纤毛虫属是均毛属、头毛属、腹甲双毛属、刺甲双毛属相对丰度，其中A样品均毛属（14.1% vs. 1.9%）、腹甲双毛属相对丰度（2.8% vs. 1.5%）显著高于F样品（P<0.05），而头毛属（6.7% vs. 12.5%）、刺甲双毛属相对丰度（0.3% vs. 2.5%）显著低于F样品（P<0.05）。本试验结果表明，幼龄川中黑山羊瘤胃液纤毛虫相对丰度最高的种属为多加多泡双毛属，瘤胃中还有许多未被分类鉴定且相对丰度较高的真核生物，需要进一步研究。
Subjects: Biology >> Botany submitted time 2022-12-29 Cooperative journals: 《广西植物》
Abstract：
To explore the population quantitative characteristics and regional distribution of wild Viburnum plants in southwest Hubei, and reveal the survival status and development trend of the following five Viburnum species: V. erosum, V. betulifolium, V. sympodiale, V. setigerum and V. dilatatum. A total of 27 hm2 permanent monitoring stands were set up in Jinzishan National Forest Farm, Mulinzi National Nature Reserve and Qizimei Mountain National Nature Reserve in southwest Hubei. The age structure, dynamic quantitative analysis and static life table of five Viburnum species were used to explore the population structure, dynamic characteristics and future development potential of Viburnum plants. The results were as follows: (1) The distribution area and population size of Viburnum plants in southwest Hubei are significantly different. (2) The age structure of the five Viburnum species displays as the pyramidal type summarized from population structure and dynamic analysis.. The number of individuals of each population is large at the young stage (89.48% of V. erosum in Jinzi Mountains, 76.38% of V. betulifolium, 67.24% of V. erosum in Mulinz, 62.11% of V. dilatatum, 56.53% of V. sympodiale, 58.44% of V. setigerum), and only a small proportion of individuals (0.18% of V. erosum in Jinzi Mountains, 0.85% of V. betulifolium, 3.29% of V. erosum in Mulinz, 3.97% of V. dilatatum, 8.37% of V. sympodiale, 2.79% of V. setigerum) in the older stage. The young stage plants of five Viburnum species all have strong growth potential but are sensitive to external disturbances. (3) The survival quantity of the five Viburnum species is decreasing monotonically with increasing age class presented by static life tables. Except for V. setigerum, the life expectancy reaches peak at the younger age, all other Viburnum species populations reach the peak at the middle age. The change trend of mortality rate and disappearance rate are similar, but the fluctuation of disappearance rate and mortality curve are different among different species. The survival curves are tended to be Deevey-Ⅱ type. (4) The four survival function curves show that all five Viburnum species populations exhibited a substantial decrease in the early stage, stabilization in the middle stage, and decline in the late stage. To sum up, Viburnum species are abundant plant resources in southwest Hubei. Therefore, it is scientific and feasible to exploit Viburnum plants rationally. In the young stage, artificial thinning can be carried out appropriately to improve the preserving rate. During the stable middle stage, the dominant and species which have good ornamental characters can be selected for appropriate development and utilization. However, some species need to be protected to maintain biodiversity in this area.
Subjects: Biology >> Botany >> Applied botany submitted time 2024-04-17 Cooperative journals: 《广西植物》
Abstract： Firmiana pulcherrima is not only an endemic species in China but also a national grade second-level key protected plant. It is naturally distributed in the tropical rainforest area of central Hainan. To explore the survival status, development trend and the main reasons for its endangerment of the population, this paper conducted a field investigation on the natural population of F. pulcherrima in Diaoluo Mountain. The age-class structure of the population was constructed by replacing time with space. The population structure characteristics and dynamic change rules were analyzed through methods such as static life table and dynamic quantitative analysis, and the future development potential of the population was predicted by time series model. The results were as follows: (1) The population of F. pulcherrima was a growing type. The number dynamic index of entire population structure when ignoring external interference Vpi is greater than the number dynamic index of entire population structure when considering external interference V′pi, and both are greater than 0. The maximum risk probability of population to completely random disturbance Pmax was 1.82%. The population has a complete age structure, weak anti-interference ability, poor growth and stability. (2)The life expectancy of the population reached the maximum at the second age class, and then decreased with the increase of age class. Mortality and vanish rates peaked at age I, VII and IX. The survival curve was Deevey-III type. (3)Survival analysis showed that the population decreased sharply in the early stage and tended to be stable in the mid-late stages. (4)After 3,6 and 9 age classes in the future, the number of individuals in the remaining age classes increased except for the IV and VIII age classes. The population has strong natural regeneration ability. Consequently, strong light environment screening and interspecific competition are the main reasons for the endangerment of F. pulcherrima. It is suggested to take measures such as moderately thinning and pruning, strengthening population and habitat protection, actively carrying out artificial breeding and returning population expansion to promote the growth and recovery of the population.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-03-18 Cooperative journals: 《广西植物》
Abstract： Camellia kweichowensis is a rare 5-locular capsule-bearing representative species of the section Camellia with biological importance and economic value. This study explored the reasons for its endangered status and effective ways to conserve and utilize resources. In this study, by combining the sample investigation and actual measurement methods, the analysis of population age structure and survivability, we studied the quantitative characteristics of population structure dynamics and future development trend. The results were as follows: (1) The primary vegetation of C. kweichowensis had typical characteristics of subtropical humid evergreen broad-leaved forests. While the mixed evergreen and deciduous broad-leaved forest accounted for the main stand, the coniferous broad-leaved mixed forest of Pinus armandii + Betula luminifera + Liquidambar formosana + Nyssa sinensis + Camellia sp. + Eurya sp. + Schima sp. was common. (2) The growth population of C. kweichowensis dominated the growth structure. The points were mainly concentrated in the small and medium tree stages, and the sum of the proportion constituted 73.02% of the overall population. Deevey-Ⅱ type characteristic of the population survival curve was obvious, the life expectancy of C. kweichowensis was the maximum at the seedling stage. The change trend of mortality and the vanishing curves of the same plot were approximately the same. The quantitative dynamic analysis indicated that the three plots had abundant seedling pools, but were sensitive to the disturbance outside the habitat. The probability of surviving to Ⅶ age-class dropped significantly to 36.17%. On the whole, the population structure showed the characteristics of “growth in the early stage and decline in the late stage of Ⅳ age-class”. (3) The time-series forecast analysis indicated that after the growth period of 2-, 4-, 6-, 8-, and 10-diameter scales, the C. kweichowensis population dynamics tilted toward the succession of middle trees (Ⅴ-Ⅶ age-class), big trees (Ⅷ-Ⅹ age-class), and aged trees (Ⅺ-ⅩⅢ age-class). In conclusion, due to the limited habitat resources and space, intraspecific and interspecific competition intensifies, which reduces the survival rate of population seedlings and the number of young, and increased the mortality of adult plants caused by human predatory logging. As a result, the population renewal and diffusion are hindered, the distribution area is narrow, and the species tend to be endangered.
Hits
Hits
Downloads
Comment