土壤的透气性是指土壤让空气穿透本身的能力。透气性是土壤很重要的物理性质,因为它不仅决定了土壤与大气间空气交换的速度,而且和土壤的持水性有关心],测定土壤的透气性还可以了解土壤其他一系列的物理性质如排水的能力、地表迳流的速度、耐蚀性、空气容量及其结构性的程度等等。土壤中微生物活动的方向与强度、种籽的发芽、根系的发育及其吸收能力、土壤中养分的状态和影响农作物生活的其他重要土壤因素都有赖于土壤的透气性。因为在土壤所有的物理性质中,以透气性的变化最为敏感, Soil permeability means the ability of the soil to allow air to penetrate itself. Breathability is a very important physical property of the soil because it determines not only the rate of air exchange between the soil and the atmosphere, but also the soil’s water holding capacity. It can also be used to determine the permeability of soil to a range of other physical properties of the soil such as The ability to drain, the speed of surface turbulence, corrosion resistance, air volume and the extent of its structural, and so on. The direction and intensity of microbial activity in the soil, the germination of the seed, the development and absorption of the root system, the state of nutrients in the soil, and other important soil factors affecting the crop life depend on the permeability of the soil. Because of all the physical properties of the soil to the most sensitive to changes in breathability,