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

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.

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

By using improved heating cables, a field experiment was conducted to
study the effects of 1 ℃〖KG-*2〗-〖KG-*7〗30 ℃ soil warming on the growth and phys
iological characters of Deyeuxia angustifolia. Soil warming obviously promoted t
he growth of D. angustifolia. Under flooded condition, the plant height incr
eased 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 2
581%; under un-flooded condition, the plant height increased by 1209%, leaf
 area increased by 329%, root volume increased by 3626%, total root absorbin
g area increased by 3747%, an
d tillers number increased by 3277%. The responses of D. angustifolia phys
iolog
ical indices to soil warming were more obvious under flooded than under un-floo
d
ed condition. Under flooded condition, the total chlorophyll content and root so
luble protein content increased by 98% and 2388%, while the leaf soluble pro
te
in and soluble carbon contents and root soluble carbon content decreased by 25
0
2%, 2292%, and 3523%, respectively. 1 ℃〖KG-*2〗-〖KG-*7〗30 ℃ soil warming pro
moted the growth of
D. angustifolia, but the responses of its physiological characters to the so
il warming varied with water conditions.