杨柴对高CO_2浓度和土壤干旱胁迫的响应  

Response of Hedysarum mongolicum Turcz. to high CO_2 concentration and soil drought stress

作　　者：郭建平[1] 高素华[1] 王连敏[2] 王春艳[2] 李忠杰[2] 刘功[2] 

机构地区：[1]中国气象科学研究院,北京100081 [2]黑龙江省农业科学院,黑龙江哈尔滨150086

出　　处：《植物资源与环境学报》2002年第1期14-16,共3页Journal of Plant Resources and Environment

基　　金：国家重点基础发展规划项目"我国生存环境演变和北方干旱化趋势预测研究"(G19990 4340 7)资助

摘　　要：毛乌素优势植物杨柴 (HedysarummongolicumTurcz.)对高CO2 浓度和土壤干旱胁迫响应的研究结果表明 :干旱胁迫可使杨柴根系伸长 ,根生物量、地径、主茎高和茎生物量下降 ;高CO2 浓度使杨柴根和茎生物量明显增加 ,CO2 的“施肥效应”显著 ,干旱使CO2 的“施肥效应”减弱。同时 ,土壤干旱胁迫使杨柴的根 /冠比增加 ,说明在土壤干旱胁迫情况下根的生长比地上部分 (茎 )的生长更活跃 ,有利于提高杨柴在干旱沙漠地区的固沙作用 ;CO2 浓度升高和土壤干旱胁迫均使杨柴叶片的水势下降 ,叶片水势的下降使叶片细胞对水分的束缚力增强 ,从而减少植物蒸腾耗水 。Thr response of Hedysarum mongolicum Turcz., a dominant plant species in Maowusu sandland, to high CO-{2}concentration and soil drought stress was studied. The results showed that the soil drought stress lengthened root length, decreased the dry biomass of root and stalk and the growth value of basal diameter and stalk height. The high CO-{2}concentration increased the dry biomass of root and stalk. The 'fertilizer effect' of CO-{2}was significant. But soil drought weakened the 'fertilizer effect' of CO-{2}. Meanwhile, the soil drought stress increased root/canopy ratio, it meant that the root growth is more activity than that of stalk growth in the soil drought stress case, and advantages to the fixing-sand effect of H. mongolicum in drought desert regions. CO-{2}concentration increment and soil drought stress was decreased leaf water potential of H. mongolicum, it enhanced the tie power of leaf cell to water. So, it can decrease plant transpiration and advance water use efficiency.=

关 键 词：杨柴 CO2 浓度 土壤 干旱胁迫 二氧化碳 

分 类 号：S541.9[农业科学—作物学] Q945.78[生物学—植物学]