Effects of climate change on photosynthesis of Diospyros kaki under different soil moisture conditions
Taking two-year-old Diospyros kaki as test material,this paper studied the effects of high stomatal conductance(G_s),water use efficiency(WUE),chlorophyll content, F_v/F_m,and F_v/F_o under different soil moisture conditions, with the ambient air temperature and CO_2 concentration(380 μmol·mol~(-1))as the conT_rol. Under all test soil moisture conditions, the combination of high CO_2 concentration and high temperature decreased the T_r and G_s, but increased the WUE. This combination increased the P_n when the soil moisture content was 75%-85%and 55%-65%of field capacity, but decreased the P_n when the soil moisture content was 35%-45%.High CO_2 concentration increased the P_n and WUE but decreased the G_s and T_r under all test soil moisture conditions. The effects of high temperature and its combination with high CO_2 concentration on the WUE depended on soil moisture condition, with the WUE increased with increasing soil moisture content. Comparing with the control, high CO_2 concentration also increased the leaf Chla,Chlb,Chl(a+b), and Car concentrations and the F_v/F_m and F_v/F_o values, relieved the water stress, and increased the stress-resistance of D.kaki.
国家科技期刊平台
NSTL
万方数据
维普
