1. 北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室,北京,100083
2. 宁夏哈巴湖国家级自然保护区管理局, 宁夏盐池,751500
纸质出版:2015
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刘小丹, 张克斌, 王晓, 等. 围封年限对沙化草地群落结构及物种多样性的影响[J]. 水土保持通报, 2015,35(3):39-43.
LIU Xiaodan, ZHANG Kebin, WANG Xiao, et al. Influence of Enclosure Ages on Community Structure and Species Diversity of Sandy Grassland[J]. Bulletin of Soiland Water Conservation, 2015, 35(3): 39-43.
刘小丹, 张克斌, 王晓, 等. 围封年限对沙化草地群落结构及物种多样性的影响[J]. 水土保持通报, 2015,35(3):39-43. DOI: 10.13961/j.cnki.stbctb.2015.03.014.
LIU Xiaodan, ZHANG Kebin, WANG Xiao, et al. Influence of Enclosure Ages on Community Structure and Species Diversity of Sandy Grassland[J]. Bulletin of Soiland Water Conservation, 2015, 35(3): 39-43. DOI: 10.13961/j.cnki.stbctb.2015.03.014.
[目的] 了解围封年限对宁夏回族自治区盐池县沙化草地群落结构及物种多样性的影响
揭示围封沙化草地植被变化规律。[方法] 在半干旱区运用空间代替时间法选取不同围封年限区(5
10
20 a)和未封育区(对照)的沙化草地为研究对象
进行群落结构及物种多样性的对比研究。[结果] 1年和2年生草本是未封育区的优势种。灌木是封育5 a区的优势种
而封育10 a区的优势种是灌木和多年生草本
在封育20 a区
优势种是多年生草本。与未封育区相比
围封5 a
10 a区植被数量特征值均有显著提高
而围封20 a区特征值稍高
但相差不大。[结论] 并不是围封时间越长
植被生长状况就越好。小于5 a的封育年限可以提高群落的物种多样性
封育年限大于10 a
反而使物种多样性下降。围封措施对植被恢复起到了先促进后抑制的作用。
[Objective] To investigate the influence of enclosure ages on community structure and species diversity of sandy grassland in Yanchi County of Ningxia Hui Autonomous Region
for revealing the change rule of vegetation restoration in the enclosed sandy grassland. [Methods] Taking the non-enclosure and enclosed sandy grasslands in 5
10
20 years as research objects
the influence of different enclosure ages on the community structure and species diversity in semi-arid region was carried out by using the method ofspace-for-time subotitution. [Results] The dominant species in not enclosed areas were annual and biennial herbs. In enclosed areas
they were shrubs enclosed for 5 years
perennial herbs and shrubs for 10 years
perennial herbs for 20 years
respectively. Comparied with not enclosed area
the index values of vegetation cover
community density and biomass were increased obviously in 5 and 10 year enclosed areas
while decreased a little in 20 year enclosed area. [Conclusion] The long-term enclosure could not improve the productivity of sandy grassland vegetation. The enclosure ages less than 5 years can promote vegetation restoration
but it plays an inhibitory role when the enclosure ages was more than 10 years. In the short term
enclosing measures promote vegetation restoration
but for long term
enclosure plays an inhibitory role.
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