土壤是由大小不等、形状各异的固体土粒堆集而成。土粒部分占土壤体积的一半,另一半体积就是土粒之问的各种形状万千、大小不一的孔隙,孔隙里不是水就是空气。固体土粒、水、空气这三样就是土壤的组成物质。我们看到的首先是固体土粒,然后是它们间不完全吻合的接触所形成的孔隙。所以土粒是土壤的主要物质。它是由矿物质和 Soil is composed of solid particles of various sizes and shapes. Part soil accounts for half of the volume of soil, the other half is the size of the earth asked the various shapes and sizes of pores, the pore is not water or air. Solid soil particles, water, air, these three is the composition of the soil material. The first thing we see is solid earth particles, then the pores formed by the imperfect contact between them. So soil particles are the main material of the soil. It is made of minerals and