放牧干扰对青藏高原东缘窄叶鲜卑花空间结构的影响  

Effect of Grazing Interference on the Architecture of Sibiraea angustata in the Eastern Qinghai Tibetan Plateau

作　　者：尹亮[1] 李绍蓉 周敏 王乾[1] 吴彦[1] 罗鹏[1] 

机构地区：[1]中国科学院成都生物研究所,成都610041 [2]四川省松潘县畜牧局,松潘623300

出　　处：《植物研究》2010年第6期737-741,共5页Bulletin of Botanical Research

基　　金：国家科技支撑计划(2006BAC01A00-11;2006BAC01A00-15);中国科学院知识创新工程重大专项(KZCX2-XB2-02);四川省青年基金(09ZQ026-087)

摘　　要：在四川西北部松潘县卡卡沟对青藏高原东缘高海拔地区3个不同放牧强度下的窄叶鲜卑花灌丛的空间结构进行了研究,结果表明:放牧干扰对卡卡沟东南坡的窄叶鲜卑花空间结构影响显著,植株的总生物量、总叶面积和茎的边材面积在重度放牧下显著低于轻度和中度放牧梯度样地。中度和重度放牧情况下叶片长度、宽度以及面积均比轻度放牧显著提高;植株高度随放牧强度增加出现先升后降的现象,而顶部枝叶生物量分配则出现与之相反的情况。虽然植物空间结构发生变化,但是单位边材面积上支持的叶面积并没有变化,中度放牧使植株枝叶生物量更加均匀分布。放牧干扰下植物空间结构的塑性变化依然受到Huber数的制约,使叶片蒸腾耗水与茎的供水能力上维持平衡。Study on the structure of Sibiraea angustata shrubs at Kaka valley,Songpan county in Northwestren Sichuan（eastern edge of Qinghai-Tibetan Plateau） showed that its architecture was significantly influenced by grazing interference.Total biomass,total leaf area and sapwood area of individual ramets decreased significantly under heavy grazing intensity.Single leaf length,width and area enlarged significantly under moderate and heavy grazing intensities.Though maximum individual height was reached under moderate grazing intensity,the extent of aggregation of leaf and shoot biomass at top part decreased.The variation of architecture did not change the leaf area supported by unit sapwood area.Phenotypical plasticity under grazing is still controlled by Huber value to maintain the balance between leaf transpiration and hydraulic conductivity of stem.

关 键 词：放牧干扰 窄叶鲜卑花 空间结构 水力平衡 

分 类 号：S718.542[农业科学—林学]