不同退化阶段伊犁绢蒿荒漠草地群落生长季动态变化分析  

The Community Dynamic Change of Degraded Seriphidium transiliense in Desert Grassland duing the Growing Season

作　　者：靳瑰丽[1] 何龙[1] 梁娜[1] 鲍文婧 

机构地区：[1]新疆农业大学草业与环境科学学院/新疆草地资源与生态重点实验室,乌鲁木齐830052

出　　处：《新疆农业科学》2014年第9期1754-1759,共6页Xinjiang Agricultural Sciences

基　　金：新疆维吾尔自治区教育厅重点项目(XJEDU2011I21)

摘　　要：[目的]研究退化伊犁绢蒿荒漠草地生长季群落变化及动态变化规律,为适时监测、生态恢复及合理利用提供现实依据.[方法]从4-10月逐月对中度、重度、极度3个退化阶段草地群落物种组成、地上生物量、高度、密度和盖度进行动态测定,统计分析退化草地群落在生长季的变化特征与规律.[结果]从春季到秋季同一退化阶段群落优势种始终保持一致;随着退化增强,群落物种组成受月季动态影响逐渐增大,并且多体现在春秋两季.各退化阶段群落数量特征随月份增加基本呈现峰谷交替的波动式下降趋势.4～6月群落数量特征差异显著且规律性强,基本为重度退化＞极度退化＞中度退化;7月后无明显规律性.[结论]生长季内,各退化阶段优势种相对稳定,其他数量特征波动性较大,4～6月较其他各月更能区分出群落的退化程度.[Objective] Through studying the community change of degraded Seriphidium transiliense desert grassland in growing season,the project aims to summarize the dynamic change rule and take the realistic basis for timely monitoring,ecological restoration and reasonable utilization for this type of degraded grassland.[Method] From April to October,the community species composition,aboveground biomass,height,density and coverage of the media degradation,serious degradation and heavy degradation were monitored month by month.Then the variation characteristics and laws of degraded grassland community in growing season were counted and analyzed.[Result] From spring to autumn,the community dominant species of the same degraded stage always remained the same.With the intensity of grassland degradation,community species composition changed was intensely affected by month dynamic,and it changed in spring and autumn mostly.The quantitative characteristics of the community decreased by peaks-valleys alternately mainly from sping to autumn,and had significant difference and strong regularity from April to June,and they were mostly the sort of serious degradation 〉 heavy degradation 〉 media degradation,but had no significant regularity from July.[Conclusion] In the growing season,the dominant species relatively were stable,but the other quantitative characteristics were volatile,and the time from April to June was the better time for distinguishing the degraded communities.

关 键 词：退化伊犁绢蒿荒漠草地 群落 退化阶段 月动态 

分 类 号：S812[农业科学—草业科学]