模拟土壤温度升高对湿草甸小叶章生长及生理特性的影响

Effects of simulated soil warming on the growth and physiological characters of Deyeuxia angustifolia

采用改进的电缆加热升温方法,研究了土壤温度升高1℃～3℃对湿草甸小叶章生长及生理特性的影响.结果表明:土壤温度升高明显促进了小叶章植株的生长.淹水处理条件下各指标的增长程度依次为:根系总吸收面积(60%)>叶面积(37.32%)>分蘖数(25.81%)>根系体积(24.67%)>株高(18.2%);非淹水处理条件下为:根系总吸收面积(37.47%)>根系体积(36.26%)>叶面积(32.9%)>分蘖数(32.77%)>株高(12.09%).淹水处理条件下小叶章各生理指标对温度升高的响应较为显著,升温淹水处理下小叶章的总叶绿素含量、根部可溶性蛋白含量均呈增加趋势(9.8%和23.88%),而叶片可溶性蛋白和可溶性糖及根部可溶性糖含量显著下降(24.67%、22.92%和35.23%).说明土温升高1℃～3℃能够显著促进湿草甸小叶章的生长,且其生理特性对土温升高的响应程度因水分条件而异.

By using improved heating cables, a field experiment was conducted to study the effects of 1 22-30 22 soil warming on the growth and physiological characters of Deyeuxia angustifolia. Soil warming obviously promoted the growth of D. angustifolia. Under flooded condition, the plant height increased by 18.2%, leaf area increased by 37.32%, root volume increased by 24.67%, total root absorbing area increased by 60%, and tillers number increased by 25.81% ; under unflooded condition, the plant height increased by 12.09%, leaf area increased by 32.9%, root volume increased by 36. 26%, total root absorbing area increased by 37.47% , and tillers number increased by 32.77%. The responses of D. angustifolia physiological indices to soil warming were more obvious under flooded than under un-flooded condition. Under flooded condition, the total chlorophyll content and root soluble protein content increased by 9.8% and 23.88%, while the leaf soluble protein and soluble carbon contents and root soluble carbon content decreased by 25.02%, 22.92%, and 35.23%, respectively. 1 22-30 22 soil warming promoted the growth of D. angustifolia, but the responses of its physiological characters to the soil warming varied with water conditions.