|
|||||
|
|
| 呼伦贝尔羊草草甸草原植物多样性与退化程度关系 | |
| 引用本文： | 陈涛,柳小妮,辛晓平,张雄,苑力晖.呼伦贝尔羊草草甸草原植物多样性与退化程度关系[J].甘肃农业大学学报,2008,43(5). |
| 作者姓名： | 陈涛 柳小妮 辛晓平 张雄 苑力晖 |
| 作者单位： | 1. 甘肃农业大学草业学院,甘肃,兰州,730070;呼伦贝尔草原生态系统国家野外科学观测研究站,内蒙古 呼伦贝尔 021012;中国农业科学院农业资源与区划研究所,北京,100081 2. 甘肃农业大学草业学院,甘肃,兰州,730070 3. 呼伦贝尔草原生态系统国家野外科学观测研究站,内蒙古 呼伦贝尔 021012;中国农业科学院农业资源与区划研究所,北京,100081 |
| 基金项目： | 国家重点基础研究发展计划(973计划),国家科技支撑计划项目 |
| 摘 要： | 对不同退化程度下呼伦贝尔羊草草甸草原植物多样性进行了研究.结果表明:随草原退化程度加重,植物种数目逐渐减少,其中禾本科植物物种明显下降,而豆科、菊科、莎草科植物物种数目变化不大;生活型内多年生草本植物和半灌木类植物种逐渐减少,而一、二年生草本则呈现"低-高-低"的波动变化;中生植物物种数目在群落中所占比例明显下降,而中旱生和旱生植物所占比例逐渐上升;在草原退化过程中,植物群落发生了羊草+杂类草草原-羊草+寸草苔-寸草苔的逆向演替;随草原退化加剧,群落α-多样性明显下降,其中重度退化草地的物种丰富度、多样性、均匀度分别比轻度退化草地下降了27%、62%、61%;β-多样性指数表明,轻度退化草地与中度、重度退化草地的群落结构相似性较低,中度与重度退化草地之间相似性较高. |
| 关 键 词： | 羊草草甸草原 植被退化 物种多样性 逆向演替 |
The relationship between community species diversity and degradation degree of Leymus chinensis meadow steppe in the Hulunbeier |
|
| CHEN Tao,LIU Xiao-ni,XIN Xiao-ping,ZHANG Xiong,YUAN Li-hui.The relationship between community species diversity and degradation degree of Leymus chinensis meadow steppe in the Hulunbeier[J].Journal of Gansu Agricultural University,2008,43(5). | |
| Authors: | CHEN Tao LIU Xiao-ni XIN Xiao-ping ZHANG Xiong YUAN Li-hui |
| Abstract: | The community species diversity of Leymus chinensis meadow steppe in different degradation degrees in Hulunbeier was studied on the basis of sample plot survey.The results showed as follows:1) Along with the degradation degree,the species number of plants gradually decreased,and the species number of plants in different families varied as well,among which the species number of plant in Gramineae decreased,the species number of plants in three families including Leguminosae,Compositae and Cyperaceae had no significant variation,while the species number of plants in the genus Potentilla L.of Rosaceae with a kind of indicative significance for grassland degradation significantly increased.2) Along with degradation succession,the species composition of plants in different life forms had changed.Among which,the species number of perennial herbaceous plants and semi-shrubs gradually decreased.As to annual-biennial herbaceous plants,the species number showed a changing trend of single peak curve(low-high-low) with degraded succession.As to the change dynamics of ecological types with succession process,the proportion of the species number of the mesophytes gradually decreased,while the proportion of the species number of both the intermediate xerophytes and xerophytes increased.3) Along with the grassland degradation gradients,the grassland communities showed a series of regressive succession from the Leymus+forbs meadow to the Leymus+Carex duriuscula meadow,and to the Carex duriuscula meadow.4) The α-diversity of communities significantly decreased with serious degradation of grassland,in which three indexes such as species richness,diversity and evenness decreased by 27 %,62 %,and 60.7 % respectively compared with the light degradation.5)The β-diversity indexes in community gradient showed that the similarity in community structure of light degradated communities to others was lower,while the moderate degraded communities was more similar to the heavy degraded communities. |
| Keywords: | Leymus chinensis meadow steppe vegetation degradation species diversity regressive succession |
| 本文献已被 维普 万方数据 等数据库收录！ | |