长期连作与轮作种植体系中土壤含水率生育期动态变化

Dynamic Changes of Soil Water Content in Long-term Continuous Cropping and Rotation Cropping Systems

摘要:

通过对玉米连作与轮作制度下,不同时期及不同土层土壤含水率的定位采样测定,研究比较不同种植方式土壤水分动态变化规律和空间立体分布,揭示土壤含水率与种植方式的关系。结果表明:轮作区较连作区土壤含水率在玉米播种-拔节期有不同程度的增加,0～20 cm及0～40 cm分别增加2～4.2 mm和2.6～6.7mm;各处理土壤含水率时间变化趋势相同,但变幅不同,均在拔节前及收获前最低,在土壤结冻前最高。

Abstract:

Different layer of soil in long-term continuous and rotation cropping system was sampled at different stages and their water content determined for studying the soil water dynamics and spatial three-dimensional distribution and discovering the relationship between soil water content and planting pattern.The results showed that soil water content in rotation cropping was increased from sowing to elongation.Soil water content of 0-20cm and 0-40cm was increased by 2mm-4.2mm and 2.6mm-6.7mm of rainfall.The trend of changes of soil moisture content time was the same,but ranges were different.Soil water content was the lowest at elongation and at harvest,the most before freezing.