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中文摘要：
以宁夏盐池封育区为研究对象,调查了2003年-2007年植被的植物种数、盖度、密度和生物量。在生态学和统计学基础上,采用专家权重法,构建植被波动强度计算公式来分析植被数量波动强度。结果表明：正向波动最大的是2003年,波动强度为0.622,是研究时间内植被生长状况最好的一年。负向波动最大的是2006年,波动强度为-0.472,是研究时间内植被生长状况最差的一年。
英文摘要：
The fenced region in Yanchi County,Ningxia was chosen as study area,the plants number 、cover-age、density and biomass between 2003 to 2007 were investigated.Using the method of expert weighting,fluctu-ation intensity formula was built to study vegetation fluctuation intensity.The results showed that the biggest posi-tive fluctuation intensity was 0.622 in 2003,which was the best vegetation growth year during study period.While the maximum of negative fluctuation intensity was-0.472 in 2006,meaning the worst vegetation growth year during study period.
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Spatial pattern of a plant community in a wetland ecosystem in a semi-arid region in northwestern Ch
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