毛乌素沙地油蒿群落生物结皮的分布特征

张军红

doi:10.13961/j.cnki.stbctb.2014.03.045

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毛乌素沙地油蒿群落生物结皮的分布特征

试验研究

- 毛乌素沙地油蒿群落生物结皮的分布特征
- Distribution Characteristics of Biological Soil Crust for Artemisis Ordosica Community in Mu Us Sandy Land
- 水土保持通报 2014年33卷第3期页码：227-230
- 作者机构：
  
  重庆水利电力职业技术学院, 永川,重庆,402160
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目"白刺叶片形态变化对水分利用的优化调控"(31200536)
- DOI：10.13961/j.cnki.stbctb.2014.03.045
  中图分类号：
- 纸质出版：2014
- 稿件说明：
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张军红. 毛乌素沙地油蒿群落生物结皮的分布特征[J]. 水土保持通报, 2014,33(3):227-230.

ZHANG Jun-hong. Distribution Characteristics of Biological Soil Crust for Artemisis Ordosica Community in Mu Us Sandy Land[J]. Bulletin of Soiland Water Conservation, 2014, 33(3): 227-230.
张军红. 毛乌素沙地油蒿群落生物结皮的分布特征[J]. 水土保持通报, 2014,33(3):227-230. DOI： 10.13961/j.cnki.stbctb.2014.03.045.

ZHANG Jun-hong. Distribution Characteristics of Biological Soil Crust for Artemisis Ordosica Community in Mu Us Sandy Land[J]. Bulletin of Soiland Water Conservation, 2014, 33(3): 227-230. DOI： 10.13961/j.cnki.stbctb.2014.03.045.

摘要

为研究毛乌素沙地油蒿群落中生物结皮分布状况

根据放牧强度选取沙利(禁牧)、陶利(轻度放牧)和乌审召(正常放牧)3个试验点

分别调查了油蒿群落中固定沙地和半固定沙地植被盖度、油蒿盖度、生物结皮盖度、凋落物盖度、生物结皮破碎度、生物结皮厚度等指标。结果表明

毛乌素沙地油蒿群落中固定沙地生物结皮平均盖度为83.74%

半固定沙地生物结皮平均盖度为23.54%;油蒿群落中半固定沙地生物结皮绝大部分是处于初期发育阶段的藻结皮

而固定沙地苔藓和地衣结皮所占比例接近总盖度的1/2;半固定沙地大多数处于初期发育阶段的生物结皮受上层植被的影响更大;轻度放牧干扰对油蒿群落固定沙地生物结皮盖度和厚度的影响均不显著

而正常的放牧干扰会导致生物结皮盖度显著下降;半固定沙地生物结皮对放牧干扰的影响更为敏感

即使是轻微的放牧干扰

也会产生与正常放牧干扰相当的效果。

Abstract

The three experimental sites of Shali(no grazing)

Taoli(light grazing) and Wushenzhao(normal grazing) were selected according to grazing intensity to study the distribution characteristics of biological soil crust(BSC) for Artemisia ordosica community in Mu Us sandy land. The vegetation coverage

Artemisia ordosica coverage

BSC coverage

litter-fall coverage

fragmentation of BSC and its thickness in each experimental site were investigated for the fixed and semi-fixed sandy lands with Artemisia ordosica community. Results showed that the BSC coverage averaged 83.74% in fixed sandy land and 23.54% in semi-fixed sandy land. The BSC in semi-fixed sandy land was mostly the alga crust belonging to the initial developmental stage

while about half the BSC in the fixed sandy land was the mosses and lichen dominated crust. The coverage and thickness of BSC did not showed significant differences between grazing and light grazing in fixed sandy land

but normal grazing led to the significantly decreased coverage and thickness of BSC. The BSC in semi-fixed sandy land were more sensitive to distribution

even if a slight grazing disturbance would produce a considerable interference like normal grazing.

关键词

Keywords

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