高CO_2浓度与土壤干旱对植物体内硫积累及分配的影响研究

Impacts of CO_2 enrichment and soil drought on the Saccumulation and distribution of plants.

人工模拟大气CO2 浓度倍增和土壤干旱对植物体内S含量积累及分配的影响研究结果表明 ,高CO2 浓度和土壤干旱均使冬小麦不同部位含S量增加 ,而使大豆籽粒中S含量减少 ;干旱虽使小麦籽粒S含量增加 ,但却使小麦籽粒减产幅度大于S含量增幅。干旱对大豆的影响大于小麦 ,干旱减少大豆S含量 ,且降低大豆产量。高CO2 浓度和土壤干旱对毛乌素 3种牧草优势种茎和叶S含量的影响较复杂 ,但干旱使茎和叶生物量降幅远大于S含量变化。高CO2 浓度和土壤干旱使植物固定S总量下降 ,表现为负效应。

The impacts of CO 2 enrichment and soil drought on the S accumulation and distribution of plants were studied.The results show that CO 2 enrichment and soil drought can increase the S contents for different parts of w inter wheat,and decrease the S content o f soybean grains.Although,soil drought increases the S content of winter wheat grains,the reduction scal e of yield is bigger than the increasing scale of grain S content.The impact of soil drought on the S content of soybean grains is more serious than that on win ter wheat.Soil drought not only decrease s the grain S content,but also decreases the grain yield of soybean.The impacts of CO 2 enrichment and soil drought on s talk and leaf S contents for 3 dominant species in Mu Us sandland are relatively complicated,but the reduction scale of the dry mass is bigger than the changing scale of S content.The total S fixation under the situation of CO 2 enrichment and soil drought decreases,showing the n egative effect.