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作 者 ：何维明,董鸣

期 刊 ：生态学报 2001年 21卷 7期 页码：1084~1090

关键词：旱柳；气温升高；水分特征；水力结构；叶种群；分枝；

Keywords:air temperature rise, branch, hydraulic architecture, leaf populations, Salix matsudanaKoidz, water traits,

摘 要 ：利用小温棚升高气温 ,探讨气温升高对半干旱毛乌素沙地乡土旱生乔木旱柳幼苗的影响 ,以揭示像旱柳这样的乡土沙生乔木如何缓冲气温升高所带来的不利影响。水分饱和亏缺和失水系数均表现出随气温升高而降低的趋势 ,组织密度的变化趋势恰好相反 ;气温升高显著影响枝茎截面积比、叶干重茎截面积比、叶面积茎截面积比、叶干重枝截面积比和叶面积枝截面积比 ;叶死亡率和叶周转随气温升高呈现出降低趋势 ,而叶出生率和叶面积的变化格局为“钟形”曲线 ;气温升高促进分枝产生、增加分枝长度和角度 ,这利于增大植冠郁闭度。

Abstract:The Mu Us Sandland(107°20′~111°30′E,37°30′~39°20′N,1 300~1 600 m a.s.l.)is a very vulnerable ecotone.Climate change has been occurring dramatically in this area.For example,the mean annual air temperature increased by 0.5~1.8℃.Based on the prediction of GCM,if atmospheric CO\-2 concentration were doubled,the future mean annual air temperature would increase by 3.5~5.0℃ in the Mu Us Sandland.As a dominant xeric tree species,\%Salix matsudana\% will be intensively affected by the future climate change such as...

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