Influencing factors and their simulation of summer maize land surface-air temperature difference under drought conditions

doi:10.13287/j.1001-9332.201901.039

Abstract

Abstract: Crop water deficit status characterized by land surface-air temperature difference (T_s-T_a) has been widely investigated. However, empirical evidence for characteristics and impact factors of T_s-T_a considering the process of crop growth are less yet, which restricts the accurate simulation of T_s-T_a. Here, the data of T_s-T_a during the process of maize growth were obtained from five irrigation water control experiments after the period of summer maize 3-leaf stage in 2014 and jointing stage in 2015. The results showed that T_s-T_a of summer maize cropland was significantly affected by soil water content. T_s-T_a increased with the deficit of soil water. During summer maize water treatments, the normalized difference vegetation index (NDVI) was the main impact factor of T_s-T_a, with a significant linear relationship. However, during different growth stages, some additional factors including meteorological, biological and soil factors could also affect T_s-T_a, including canopy photosynthetic active radiation absorption ratio (f_APAR) after 3-leaf stage, relative soil water content (RSWC), and air relative humidity (RH) from 3-leaf stage to jointing stage. Then, the growth duration simulation model of T_s-T_a, vegetative growth simulation model of T_s-T_a and reproductive growth simulation model of T_s-T_a were established in terms of the data in 2014. Those simulation models were validated based on the experimental data of five irrigation water treatments after summer maize jointing stage in 2015. The results showed that the growth duration simulation mode of T_s-T_a could explain 63% variation of T_s-T_a in 2015. However, 79% variation of T_s-T_a could be explained by the simulation results of the vegetative growth simulation model of T_s-T_a and the reproductive growth simulation model of T_s-T_a. The results provided the basis for the quantitative evaluation of crop drought based on T_s-T_a.

LIU Er-hua, ZHOU Guang-sheng. Influencing factors and their simulation of summer maize land surface-air temperature difference under drought conditions[J]. Chinese Journal of Applied Ecology, 2019, 30(1): 233-242.

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