Study on the Mechanism of the Influence of Soil Water Content on Cold Resistance of Thermophilic Crops Based on Principal Component Analysis

Abstract

Soil water content is one of the external factors of plant life, and the cold tolerance of plants is often transferred by this factor. The purpose of this paper is to study the mechanism of soil moisture content affecting the cold resistance of thermophilic crops based on principal component analysis. This paper uses MODIS1B data to obtain the day and night surface temperature difference and albedo parameters; combined with the soil moisture data measured by meteorological stations during the same period, the thermal inertia method is used to establish an empirical model of thermal inertia-soil water content. In addition, the mechanism of the influence of soil water content on the cold resistance of temperature-loving crop rubber and citrus during the low temperature period is discussed, which provides a basis for winter irrigation and antifreeze. The experimental results of this paper show that the vegetation index has a greater impact on the model, so the thermal inertia method has a higher accuracy in monitoring bare soil moisture content. Among them, when the temperature-loving crop rubber soil moisture content is 30%, the cold resistance mechanism reaches the maximum Good, and when the citrus soil water content reaches 22%, its cold resistance mechanism is the best.