论文部分内容阅读
黑龙江省西部半干旱地区的碳酸盐黑钙土是当地主要土类之一,经多年定点观测研究,可以看出碳酸盐黑钙土水分来源及其动态规律: 一、水分主要来源于大气降水。封冻期0—20cm土层水分主要来源于9—10月份的降水。其它各层土壤含水量则与各时期的降水关系不明显。春季解冻期的土壤水则来源于上一年的土壤封冻水。 二、水分的年循分为四个时期:1.土壤融化增湿期;2.土壤干湿交替不稳定期;3.土壤水分趋于稳定聚湿期;4.土壤水分冻结稳定期。 三、水分的垂直剖面变化受大气、生物的影响大而且深。尤以0—20cm土层变化最剧烈,但直到2米也有变化。所以该土壤易发生干旱。
Carbonate chernozem in the semi-arid area of western Heilongjiang Province is one of the major soil types in the area. After years of fixed-point observation and study, it can be seen that the source of water and its dynamics are: precipitation. During the freezing period, the water content in 0-20cm soil layer mainly comes from the precipitation in September-October. The other layers of soil moisture content and precipitation in each period of the relationship is not obvious. Spring thaw period of soil water is derived from the previous year frozen soil water. Second, the annual cycle of water is divided into four periods: 1. The soil melts and humidifies period; 2. Alternate wet and dry period of soil alternately; 3. The soil moisture tends to stabilize the poly-wet period; 4. The soil moisture freeze stable period. Third, the vertical changes in water by the atmosphere, the impact of biological large and deep. Especially 0-20cm soil layer changes the most dramatic, but up to 2 meters also have changes. So the soil is prone to drought.