| 金沙江干热河谷主要植被恢复树种叶水势的时空变化规律 |
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| 引用本文： | 段爱国,张建国,张俊佩,王军辉.金沙江干热河谷主要植被恢复树种叶水势的时空变化规律[J].林业科学研究,2007,20(2):151-159. |
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| 作者姓名： | 段爱国 张建国 张俊佩 王军辉 |
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| 作者单位： | 中国林业科学研究院林业研究所,国家林业局林木培育重点实验室,北京,100091 |
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| 基金项目： | 国家林业局林业重点工程科技支撑项目 |
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| 摘 要： | 2005年和2006年在金沙江干热河谷,选择不同季节的典型晴天测定了18个试验树种的叶水势,结果表明:(1)金沙江干热河谷主要植被恢复树种叶水势在不同季节的日变化曲线均有一个明显的高峰,绝大多数呈单峰状分布,高峰值大多数出现在下午14:00;干热生境中的树种具有丰富的叶水势多样性.(2)元谋干热河谷主要树种的叶水势受季节变化的影响较大,所有树种均表现为3月份叶水势大于5月份叶水势以及5月份叶水势小于10月份水势,5月干热胁迫的加深加剧了树种间水势的进一步分化,而雨季后干热胁迫的解除能降低分化的程度;各树种叶水势日变化在干热的5月份变动幅度最小.(3)各树种叶水势与温度、湿度及光照强度分别呈负、正、负相关,相关性可由线性方程予以恰当描述.(4)不同海拔区域所引起的环境因子与物候的差异能影响到某些树种水势的日变化幅度以及季节变化规律;以坡位而言,相对低的坡位有利于各树种叶水势维持在一个相对高的水平;印楝在3种混交模式中叶水势高低依次为:印楝与大叶相思＞印楝与银合欢＞印楝与久树,这种排序与印楝所受到的竞争强烈程度紧密相关,极度的干热环境降低了不同混交模式对植物水势的影响程度;灌溉有利于缓解或解除5月极度干热所形成的水分胁迫.
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| 关 键 词： | 金沙江干热河谷 植被恢复 水势 时空变化 |
| 文章编号： | 1001-1498（2007）02-0151-09 |
| 收稿时间： | 2006-08-02 |
| 修稿时间： | 2006-08-02 |
Spatial and Temporal Variations of Water Poten tia l of theMa in Tree Spec iesfor Vegeta tion Restora tion in the Dry-hot Va lleys of the Jin sha River |
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| DUAN Ai-guo,ZHANG J ian-guo,ZHANG Jun-pei and WANG Jun-hui.Spatial and Temporal Variations of Water Poten tia l of theMa in Tree Spec iesfor Vegeta tion Restora tion in the Dry-hot Va lleys of the Jin sha River[J].Forest Research,2007,20(2):151-159. |
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| Authors: | DUAN Ai-guo ZHANG J ian-guo ZHANG Jun-pei and WANG Jun-hui |
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| Institution: | Research Institute of Forestry, CAF; Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China |
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| Abstract: | The spatial and temporal variations of water potential of 18 tree species for vegetation restoration in the dry-hot valleys of the Jinsha river were systematically analyzed on typical sunny day of different seasons in 2005 and 2006,some main conclusions were gotten as follows:(1)The daily water potentials within leaves of the main tree species in the dry-hot valleys of the Jinsha river all obviously presented a figure of single-peak in different seasons,the most peak values of daily water potentials of the leaves appeared at 14:00;(2)The water potential within leaves of the main tree species in the valleys was deeply affected by the change of seasons,the characteristic seasonal change of water potential within leaves for all the tree species studied was that the water potential in March was bigger than water potential in May and water potential in May was smaller than water potential in October;the dry and hot in May promoted the diversity of water potential,and the relief of dry and hot stress after rainy season decreased the diversity;the diurnal variation of water potential within leaves of the tree species in May was relatively stable.(3)The water potential within leaves had the negative,positive and negative linear correlation with temperature,humidity and light intensity.(4)Different tree species were differently affected by altitude,the change of environmental factors and phenology caused by changeable altitude could affect the diurnal and seasonal variation of water potentials of some tree species;the lower location of slope was beneficial to keeping water potential at a relative high level;the order of leaf water potential of Azadirachta indica in three mixed stands from high to low was Azadirachta indica & Acacia auric,Azadirachta indica & Leucaena leucojphala,and Azadirachta indica & Sctdeichera oleosa,which was closely related to the suppressed condition of Azadirachta indica,the extremely dry and hot environment could decrease the affection of different mixed stands on plant leaf water potential;the water stress caused by the extreme drought in May could be relieved by irrigation. |
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| Keywords: | dry-hot valleys of the Jinsha River vegetation restoration water potential spatial and temporal variations |
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