2024年7月26日 星期五
杨柴对高 CO2浓度和土壤干旱胁迫的响应
Response of Hedysarum mongolicum Turcz.to high CO2 concentration and soil drought stress
2002年 第11卷 第1期 页码[14-16]    下载全文[0.5MB]  
摘要

毛乌素优势植物杨柴( Hedysarum mongolicum Turcz .) 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;CO2浓度使杨柴根和茎生物量明显增加, CO2施肥效应显著, 干旱使 CO2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( ) 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, 利于提高水资源的利用效率
 

Abstract

Thr response of Hedysarum mongolicum Turcz ., a dominant plant species in Maowusu sandland, to high CO2 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 CO2 concentration increased the dry biomass of root and stalk .The fertilizer effectof CO2 was significant .But soil drought weakened the fertilizer effectof CO2 .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 .CO2 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CO2浓度; 土壤干旱胁迫; 杨柴
Key wordsCO2 concentration; soil drought stress; Hedysarum mongolicum Turcz .
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
所在单位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
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