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土壤水分多寡是衡量作物水分丰欠的直接标志。这里重点以省内各地土壤水分含量资料说明我省农业干早的问题,并按土壤水分含量作了干旱分区。 一、影响土壤水分的自然因素 (一)天然降水及其空间分市 水热条件是影响自然景观的重要因素,降水的多寡影响植物分布和土壤形成。我省年降水量多年均值为400～700毫米之间。东部、中部为600毫米,中东部为700毫米,西部仅400毫米左右。雨量由东向西逐渐减少(图1)。
The amount of soil moisture is a direct indicator of crop moisture deficit. The key points here are soil moisture content information throughout the province to explain the issue of agricultural drought in our province, and according to the soil moisture content made a drought zoning. First, the natural factors affecting soil moisture (a) of natural precipitation and its spatial and geographical conditions hydrothermal conditions are an important factor affecting the natural landscape, the amount of precipitation affect plant distribution and soil formation. The average annual precipitation in our province is between 400 ~ 700 mm. Eastern, central 600 millimeters, central and eastern 700 millimeters, the western only 400 millimeters. Rainfall gradually decreases from east to west (Figure 1).