草地微斑块与草地退化关系的研究

The study on the relationship between mini-patch and degradation of pasture

草地植物群落微斑块的大量存在是天然放牧型草地最基本的特征之一。通过在轻、中、重3个草地退化梯度上对微斑块的种类、数量、面积及不同斑块间植被群落性状的比较分析,将草地微斑块粗略划分为裸地演替型斑块与放牧演替型斑块两大类别;剖析了微斑块的组成、结构和功能及多样性格局与草地退化程度间的内在关系。在此基础上,对草地微斑块的成因、草地微斑块相关指标在确认草地退化程度上的应用、利用微斑块的有关信息实施草地管理等问题提出了讨论性意见。

One of the basic features of a natural grazing pasture is that there are many minipatchs in the plant community of the pasture. The types, number and areas of the minipatch and community features were investigated in the different gradients of degradation. The results showed that the minipatch of the pasture could be divided into two types:bareground successional type and grazing successional type. The relationship between gradient of pasture degradation and composition, structure, function and diversity pattern of the minipatch were analysed. On the basis of the analysis, the propositions on the application of minipatch indices on identifying the degree of degradation, the management of the pasture were proposed.