生态环境学报2024，Vol.33Issue(6)：869-876,8.DOI:10.16258/j.cnki.1674-5906.2024.06.004
放牧强度对优势种群重要值和物种多样性及其二者典型关系的影响
Effects of Grazing Intensity on Dominant Population and Species Diversity and Their Typical Relationships
摘要
Abstract
The study on the changes in the relationship between the importance value of dominant populations and species diversity caused by different grazing intensities can provide theoretical support to the protection of grazing grassland and the restoration of degraded vegetation.This study choosed the Stipa breviflora desert steppe in Inner Mongolia as the research object,adopting a single factor randomized block design(CK,control;MG,moderate grazing;HG,heavy grazing).The survey was conducted on the height,coverage,and density of plant communities in each plot,then calculating the important value of dominant population and species diversity,exploring the relationship between them by comparative analysis and canonical correlation analysis.The results are as follows:With the increase of grazing intensity,the importance value of S.breviflora increased while the species richness index decreased.The dominance index was highest and the diversity index was lowest under the MG treatment.A canonical correlation analysis between the important value of dominant population and the species diversity showed that the cumulative contribution rate was largest in the MG treatment(96.060%)while it's smallest in the CK treatment(90.160%).The increasing of grazing intensity reduced the complexity and dimension of the relationship between the importance value of dominant populations and species diversity(from 2 canonical correlations to 1 canonical correlation).In CK treatment,the increasing of the importance value of each dominant population would decreased the plant community diversity index,and the increasing of the importance value of Cleistogenes songorica and Allium polyrhizum would increased the plant community evenness index.In MG treatment,the increasing of importance value of S.breviflora would decreased the dominance index.In HG treatment,the increasing in the importance value of S.breviflora and C.songorica reduced the diversity index.For the important value of dominant population and the species diversity index,the correlation with its own typical variables was more complicated,while the correlation with the corresponding typical variables was relatively simple.The number of significant correlation coefficients in CK,MG and HG treatments was 15,20 and 12,respectively.Therefore,the relationship between the importance value of dominant populations and species diversity was the most complex in MG treatment.In conclusion,the plant community have the most complex in the MG treatment,however,in the HG treatment,the plant community are more susceptible to external environmental interference,and it is relatively difficult to restore the original state after the degradation of grassland plant communities.关键词
荒漠草原/放牧强度/优势种群/物种多样性/典型相关/对比分析Key words
desert steppe/grazing intensity/dominant populations/species diversity/canonical correlation/comparative analysis分类
生物学引用本文复制引用
王梓晗,吕世杰,王忠武,刘红梅..放牧强度对优势种群重要值和物种多样性及其二者典型关系的影响[J].生态环境学报,2024,33(6):869-876,8.基金项目
国家自然科学基金项目(32260352 （）
31760143) （）
内蒙古自治区自然科学基金项目(2021MS03042) （2021MS03042）
林业科研能力提升项目(104004002) （104004002）
内蒙古农业大学学科交叉基金项目(BR22-14-04) （BR22-14-04）
内蒙古重大科技专项(2021ZD0044) （2021ZD0044）
