准噶尔盆地南缘梭梭群落对气候变化的响应  

Effects of climate change on Haloxylon ammodendron community in southern edge of Zhunger Basin

作　　者：黄培祐[1] 李启剑[1] 袁勤芬[1] 

机构地区：[1]新疆大学生命科学与技术学院,乌鲁木齐830046

出　　处：《生态学报》2008年第12期6051-6059,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30070640);国家"973"资助项目(G19990435)~~

摘　　要：以新疆准噶尔盆地南缘的天然梭梭群落为研究对象,从群落组成、梭梭幼苗天然更新状况及梭梭种群年龄结构等方面,分析不同立地条件下梭梭群落的特征.结果显示:由于气候变化,3月下旬到4月初、春雨普遍偏少且雨日间隔较长,气温随之急速上升且呈强烈波动,导致浅土层迅速变干,引起初萌的植物幼苗大量夭亡,梭梭幼苗的正常补充机制因而受到严重威胁,导致准噶尔盆地南缘梭梭种群的年龄结构普遍呈现衰退,群落显现逆行演替特征。观察表明,当地表存在稀疏的灌草和枯落层、或有适度沙层覆盖的龟裂土等类生境,仍较常见梭梭实生苗的存在,使此类局地梭梭幼苗补充机制得以维持,种群结构仍呈增长趋势。Haloxylon ammodendron community in different natural stands conditions along southern edge of Zhunger Basin were studied on its structural characteristics, seedling supplies and age structures for investigating their own population patterns. The results showed that climate change led to, temperature varied sharply and the rainfall reduced in the early spring in arid area. As a result, a large number of H. ammodendron seedling dead. The age structure of H. ammodendron was commonly decreasing in different natural stand conditions along southern edge of Zhunger Basin for the lack of seedlingsupply from climate change over the past decade. Microhabitats, the cover of soil or thin sand stratum could protect the seedling, and more H. ammodendron seedling survived. As a matter of fact, H. ammodendron age structures in these microhabitats were increase.

关 键 词：梭梭群落 气候变化 幼苗补充 年龄结构 

分 类 号：Q948[生物学—植物学]