拉萨半干旱河谷砂生槐灌丛群落退化程度评价  

Evaluation on the Degradation of Shrub Community of Sophora moorcroftiana in Semi-Arid Valley of Lhasa

作　　者：杨小林[1] 宫照红[1] 马和平[1] 

机构地区：[1]西藏农牧学院,西藏林芝860000

出　　处：《西北林学院学报》2012年第5期11-14,共4页Journal of Northwest Forestry University

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：为探索拉萨半干旱河谷地带性植被—砂生槐灌丛的恢复重建和分类经营的方法和途径,采用Delphi(专家咨询法)和AHP(层次分析法)相结合的方法,在相关指标调查的基础上,选择8个指标因子,建立退化评价指标体系及相应的综合评定指数,评判拉萨半干旱河谷砂生槐群落灌丛退化程度。结果表明:1)砂生槐群落盖度<10%,退化指数为0.78,属于极度退化;群落盖度10%～30%,退化指数为0.61,属重度退化;群落盖度30%～60%,退化指数为0.49,属中度退化;盖度≥60%以上,指数为0.27,属轻度退化。2)在极度退化地段应采取植被重建,人工进行恢复;重度和中度退化的可采用人工促进和封育措施来控制干扰强度,改善干扰方式,促进自然恢复;对于轻度退化的可采用轮牧的方式进行适度的经营活动。Shrub community of Sophora moorcroftiana is a zonal vegetation type in semi-arid valley of Lha- sa. In order to develop the method for its restoration and specific managements, based on the survey of rel- evant indicators, this paper established evaluation index system and corresponding indices by using Delphi and AHP methods. The results showed that the degradation of the community could be divided into 4 lev- els： extreme （with the coverage of less than 10 %, and degradation index of 0.78）, severe （with the cover- age of less than 10% to 30%,, and degradation index of 0. 61）, medium （with the coverage of 30% to 60%, and degradation index of 0.49）, and minor degradation （with the coverage of equal or more than 60%, and degradation index of 0, 27）. In the region with extreme degradation, artificial restoration should be adopted; in the regions with severe and medium degradations, measures such as artificial promotion res- toration and enclosure should be applied to control the intensity of disturbance, and to enhance natural res- toration; in the minor degradation region, measures such as rotational grazing could be adopted to carry out moderate production activities.

关 键 词：砂生槐 退化指数 恢复 拉萨半干旱河谷 

分 类 号：Q718.54[生物学—分子生物学]