马铃薯水分胁迫指数模型优化研究OA北大核心CSTPCD

[Objective]This study aims to explore the relationship between leaf-air temperature differ-ence and environmental factors,and further optimize crop water stress index model.[Method]A potato potted experiment was conducted at the experimental base of the Forestry College of Henan Agricultural University.The variation of leaf-air temperature difference of potatoes with solar radiation and vapor pressure deficit(VPD)under different soil moisture contents was measured on sunny days,and the upper and lower baselines of crop water stress index(CWSI)were determined.After further experi-ments,an optimized potato CWSI empirical model was obtained,and the relevant models were veri-fied.[Result]The leaf-air temperature difference increased with the decrease of soil moisture content;When the soil moisture content was low(7.28％),the leaf-air temperature difference of potatoes in-creased with the increase of solar radiation,showing a significant linear relationship;When the soil moisture content was high(15.85％),the leaf-air temperature difference of potatoes decreased with the increase of VPD,showing a significant linear relationship;The non-transpiring baseline for con-structing potato CWSI was y=0.009 8Q-0.68,and the non-water stress baseline was y=-1.67V+3.75;After validating the optimized CWSI model,it was found that as the soil moisture content de-creased,the CWSI value increased,and there was a significant negative correlation between CWSI and soil moisture content.[Conclusion]The linear relationship between the maximum leaf-air temperature difference of potatoes and solar radiation is feasible as the upper baseline for CWSI.This study inno-vates the traditional CWSI empirical model and further optimizes the CWSI empirical model.