一、土壤水分土壤水分是土壤的重要组成部分。它既影响土壤中各种物理、化学、生物化学过程的变化;又影响土壤中养分、空气、温度的协调。如,土壤中水分过多,就会通气不良,容易产生甲烷、硫化氢等有毒物质,影响作物生长;同时使土壤温度上升缓慢;土壤水分少,空气增多,有机质的矿质化增强,养分释放快积累少,因此,适宜的土壤水分是 First, the soil moisture Soil moisture is an important part of the soil. It affects not only the changes of various physical, chemical and biochemical processes in the soil, but also the coordination of nutrients, air and temperature in the soil. For example, too much water in the soil can cause poor ventilation and easily produce toxic substances such as methane and hydrogen sulfide, affecting the crop growth. At the same time, soil temperature rises slowly. Soil moisture is less, air is increased, mineralization of organic matter is enhanced, nutrient release is faster Less accumulation, therefore, suitable soil moisture is