刘忠宽,智建飞,李英杰,郭宝生

• 1:河北省农林科学院农业资源环境研究所
• 2:河北省农林科学院农业经济研究所
• 3:河北省农林科学院科技管理处
• 4:河北省农林科学院棉花研究所 河北石家庄050051

摘要(Abstract)：

分析了内蒙古温带典型草原休牧 4年后的草地土壤养分空间异质性和植物群落α多样性。结果表明 :休牧后 ,土壤养分的空间异质性呈不同程度的增大趋势 ,随机性因素所占比例增加 ;物种多样性指数和均匀度指数均有降低趋势 ,即群落物种多样性增加 ,均匀度降低。不同放牧率退化草地休牧过程中 ,植物群落的生物量、群落高度、群落盖度和群落物种多样性与土壤养分分布均表现一致的正相关关系 ,但只有植物群落生物量和群落高度与土壤有机碳、全氮、无机氮、土壤有效磷和有效硫相关性显著 (P <0 0 5 )。围封禁牧只是退化草地的一种利用方式 ,在围封一定时期后还要进行适度放牧或刈割 ,以保持草地植被的一定均匀度 ,防止 2次逆行演替发生。

关键词(KeyWords)： 休牧;土壤养分;空间异质性;植物群落;α多样性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重大研究计划项目 (90 2 110 17)

作者(Author): 刘忠宽,智建飞,李英杰,郭宝生

DOI: 10.16318/j.cnki.hbnykx.2004.04.001

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