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四川若尔盖县不同退化程度高寒草地群落比较研究

《广西植物》[ISSN:1000-3142/CN:45-1134/Q]

期数:
2011年06期
页码:
775
栏目:
植物生态学与生物多样性保护
出版日期:
2011-12-25

文章信息/Info

Title:
Comparative study of the alpine grassland communities in varying degradation in Zoige County, Sichuan Province
作者:
唐明坤12 李明富4赵杰2 陈薇薇2 索朗夺尔基3 孙治宇2*
 1.四川大学 生命科学学院生物资源与生态环境教育部重点实验室, 成都 610064; 2.四川省林业科学研究院, 成都 610066; 3.四川省若尔盖湿地国家级自然保护区管理局, 四川 若尔盖 624500; 4.四川省唐家河国家级自然保护区, 四川 青川 628109
Author(s):
TANG MingKun12 LI MingFu4 ZHAO Jie2 CHEN WeiWei2 SUOLANG DuoErji3 SUN ZhiYu2*
1.Key Laboratory of Bioresource, Ecology and Environment, Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610064, China; 2.Sichuan Academy of Forestry, Chengdu 610066, China; 3.the Management Bureau of Zoige Wetland National Nature Reserve, Sichuan 624500, China; 4.Tangjiahe Natural Reserve, Sichuan 628109, China
关键词:
高寒草地 退化梯度 群落结构 物种多样性指数 生物量干扰
Keywords:
alpine grasslanddegradation gradient community structure index of species diversity biomass disturbance
分类号:
Q948.15
DOI:
-
文献标识码:
A
摘要:
于2008年、2009年在若尔盖县沿高寒草地退化梯度进行物种多样性和生物量等方面的群落监测,以期探讨不同退化程度高寒草地群落结构特征,并提出引起退化的原因。结果表明:(1)随着退化加剧,草地群落盖度、群落物种丰富度、ShannonWiener指数和Pielou指数均递减。未退化群落以鹅绒委陵菜、无脉苔草为优势种,群落物种丰富,记录25种植物;中度退化群落以无脉苔草为优势种,记录植物20种;重度退化群落以二裂委陵菜、密花香薷、白苞筋骨草群落,记录16种植物;(2)未退化群落、中度退化群落、重度退化群落生物量鲜重多次监测的平均值分别为836.78、726.37 g/m2和542.78 g/m2,可见随着群落退化程度加剧,其生物量鲜重递减;未退化群落、中度退化群落生物量干重值在各个监测时段十分接近,而重度退化群落的值明显降低;(3)1965~1973年间挖沟排水可能是该区高寒草地退化的主要原因,放牧、干线公路、旅游开发等人为干扰是研究区草地群落退化的驱动因子。
Abstract:
The monitoring of species diversity and evenness of alpine grassland along the degradation gradient was conducted to characterize changes of the community structure in varying degradation and suggest possible causes in Zoige County in both 2008 and 2009. The results showed 〖JP3〗that:(1)the coverage,species richness,ShannonWiener and Pielou indexes of species diversity of communities were decreasing from the nondegradation to the highest degradation;(2)The aboveground biomass was decreasing from the nondegradation to the highest degradation,with 836.78 g/m2,726.37 g/m2,and 542.78 g/m2 in fresh weight for nondegraded,moderate degraded and heavy degraded communities. The weight of dry biomass of moderate degraded communities was quite close to nondegraded communities and obviously higher than heavy degraded communities;(3)Excavating discharge ditches in 1965-1973 might be the main driving factor of community degradation. Other driving factors included overgrazing,highway construction and tourism.

参考文献/References

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备注/Memo

备注/Memo:
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更新日期/Last Update: 2011-11-25