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以黄土高原19年生刺槐(Robinia pseudoacacia)人工林为对象,比较研究刺槐在环境CO_2浓度(350μmol/mol)和倍增CO_2浓度(700μmol/mol)下的净光合速率(Pn)、气孔导度(G_s)、胞间CO_2浓度(C_i)、蒸腾速率(T_r)、水汽压亏缺(VPD)和水分利用效率(WUE)的日变化动态及日均值差异.结果显示:刺槐P_n、G_s、C_i、WUE的日变化在短期CO_2浓度升高条件下并未发生明显改变,但T_r、VPD的日进程在环境CO_2浓度下呈“双峰”曲线,而在倍增CO_2浓度下呈“单峰”曲线.短期CO_2浓度升高使刺槐G_s和T_r平均降低10.01%和8.71%,但其P_n和WUE显著提高107.47%和135.40%.本研究表明刺槐人工林在黄土高原具有较强的光合潜力与水分利用能力.(图1表2参38)
The Robinia pseudoacacia plantations in the Loess Plateau were used to compare the net photosynthetic rate (Pn) and stomatal conductance (G_s) of Robinia pseudoacacia under environmental CO 2 concentration (350μmol / mol) and double CO 2 concentration (700μmol / (P_ (subscript i)), transpiration rate (T_r), water vapor pressure deficit (VPD) and water use efficiency (WUE) were calculated and analyzed.The results showed that: P_n, G_s, C_i and WUE Diurnal variation did not change obviously under the condition of short-term CO 2 concentration. However, the daily process of T_r and VPD showed a “double peak” curve under ambient CO_2 concentration and double peak at double CO_2 concentration, The results showed that the Robinia pseudoacacia plantations had strong photosynthetic potential in the Loess Plateau and the Pn and WUE increased by 107.47% and 135.40%, respectively Water use capacity (Figure 1, Table 2, reference 38)