摘要
在干旱、半干旱气候区,采用野外田间试验和室内分析相结合的方法,分析了季节性冻融期土壤剖面含水率的变化特征,试验共设裸地(LD)、覆膜地(MD)和茬覆膜地(CMD)3种处理地块。结果表明,季节性冻融期土壤剖面含水率发生了明显的变化,在土壤剖面的不同深度出现了范围不等的含水率高值区和低值区,各处理地块含水率高值区变化的层位、形成时间以及含水率达到相对稳定的深度均不同,其中CMD的聚墒区最大,含水率最高达22%;LD的聚墒区最小,含水率最高达21%,土壤剖面含水率由上到下为增大-减小-保持稳定的动态变化特点。研究结果对干旱和半干旱地区季节性冻融土壤储水保墒及高效利用土壤水资源、确定冬春灌溉合理灌水技术参数提供了参考。
In arid and semi-arid climate areas, the field experiments and indoor experiments were jontly used tO analyze the soil moisture characteristics of seasonal freezing and thawing soil in the paper. Three kinds of surface treatments were designed： non-cultivated bare plot（LD）, plastic film mulching plot（MD） and stubble and plastic film double mulching plot（CMD）. The results showed that the soil moisture changed apparently during seasonal freezing and thawing period. The higher moisture content areas and lower moisture content areas appeared in different depths of soil profile. The variable horizon and the forming time of higher moisture content areas, and the depth in which the soil moisture kept stable were all different with each treatment. The lowest moisture content area is LD, about 9.1%. The dynamic change of soil moisture in profile are increasing-reducing-maintaining stability from the surface to the bottom. The results had the theoretical and practical meanings for conserving the soil moisture,utilizing the soil water effectively, and confirming the irrigation technical parameters reasonably for seasonal freezing and thawing soil within the winter and spring irrigation.
出处
《河南农业科学》
CSCD
北大核心
2008年第5期56-58,共3页
Journal of Henan Agricultural Sciences
基金
国家自然科学基金资助项目(40472132)
关键词
季节性冻融期
土壤剖面
土壤含水率
变化特征
Freezing-thawing period
Surface treatment
Soil moisture
Varying characteristics
