拉萨半干旱河谷砂生槐灌丛生态恢复过程的群落特征与土壤微生物动态分析  

Analyses on Community Characteristics and Soil Microorganism Dynamics during Ecological Restoration of Sophora moorcroftiana in the Semi-Arid Valley of Lhasa

作　　者：赵垦田[1] 杨小林[1] 马和平[1] 张新军[1] 

机构地区：[1]西藏农牧学院,林芝860000

出　　处：《林业科学》2013年第2期15-20,共6页Scientia Silvae Sinicae

基　　金："十一五"国家科技支撑计划项目(2007BAC06B02);西藏农牧学院创新团队项目

摘　　要：为揭示拉萨半干旱河谷地带性植被砂生槐灌丛生态恢复过程的特征动态,采用空间序列代替时间序列研究方法,将处于不同封育年限(3,6,9年及CK)的砂生槐植被作为植被恢复的典型群落,对其高度、盖度、密度、生物量、多样性指数、种群生态位宽度及土壤细菌、放线菌、真菌等微生物动态进行分析。结果表明:1)采取封育措施后,外界干扰减少,从而增加物种多样性和植物特征值,使生产力得到提升;2)砂生槐生态位宽度最大,是河谷地带群落中的建群种及优势种;藏沙蒿分布较为均匀,是一种泛化种;3)群落中土壤微生物的数量与封育时间呈正比,随着封育时间的延长而越发丰富,说明在砂生槐群落封育恢复过程中,土壤环境有较为明显的改善。To elucidating characteristics of the Sophora moorcroftiana shrub zonalitical vegetation during the ecological restoration process in the semi-arid valley of Lhasa, we measured the height, coverage, density, vegetation biomass, diversity index and niche breadth of the shrub in different enclosure years （three, six and nine years）,used as the typical community of vegetation restoration, and investigated dynamics of microorganism in the soil, including bacteria, actionbacteria and fungi, by using a method of space sequence in place of time sequence. The results showed that the fencing measures increased species diversity and plant characteristics values, and raised the productivity. S. moorcroftiana is constructive species and dominant species in the valley communities and had the largest width of niche health. Artemisia wellbyi is a generalization species with more even distribution. The soil microbial quantity in the community was proportional to the fencing time, indicating that the soil environment had a significant improvement during the fencing recovery process.

关 键 词：拉萨半干旱河谷 砂生槐 生态恢复 植被特征 土壤微生物 

分 类 号：S718.54[农业科学—林学]