春玉米叶片光合生理参数对土壤水分的阈值响应及其生产力分级

doi:10.13866/j.azr.2019.04.14

Abstract

Abstract: Two modes including normal irrigation treatment and water stress treatment were designed in this experiment to discuss the threshold responses of leaf photosynthetic physiological parameters of spring maize to soil moisture and its productivity classification.The results showed that the change curves of photosynthetic rate (P_n),transpiration rate (T_r) and stomata conductance (G_s) were unimodal under normal irrigation treatment.The response of intercellular CO₂ concentration (C_i) to soil moisture was opposite to that of stomata limitation (L_s).The P_n and T_r values were significantly decreased under water stress treatment,and the reduction of P_n value was mainly caused by the stomata limitation before grain-filling.As the degree of water stress was aggravated and the photosynthetic structure was damaged,the reduction of P_n was mainly caused by non-stomata limitation.Short-term water stress reduced the water use efficiency (WUE) of maize plant appropriately,which,however,was not significant,and the WUE could be reached a medium level.After a long-term and serious water stress,the WUE was decreased significantly compared to the situation under normal irrigation.Based on the photosynthetic physiological parameters,the soil moisture availability and the productivity of maize were classified and evaluated.The relative water content (RWC) ranging from 36.8% to 42.7% was classified as the low-yield and low-efficiency water treatment,that from 42.7% to 60.4% as the medium-yield and medium-efficiency one,that from 60.4% to 77.5% as the medium-yield and high-efficiency one,and that from 77.5% to 80.6% as the high-yield and high-efficiency one.It was observed that the RWC about 77.5% was optimal.

Key words: spring maize, leaf, photosynthetic physiological parameter, soil moisture content, productivity classification, Wuwei

REN Li-wen, WANG Xing-tao, ZHAO Hong, WANG Run-yuan. Threshold Responses of Leaf Photosynthetic Physiological Parameters of Spring Maize to Soil Moisture and Its Productivity Classification[J].Arid Zone Research, 2019, 36(4): 901-908.

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Threshold Responses of Leaf Photosynthetic Physiological Parameters of Spring Maize to Soil Moisture and Its Productivity Classification

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