不同砾石覆盖保持土壤水分有效性研究

土壤水分状况是制约金沙江干热河谷地区植被恢复和造林的主要因素,改善土壤水分状况是实现该地区生态恢复重建和农业持续发展的必然途径。为给干热河谷的造林以及作物种植提供切实可行的方法,进行了不同砾石覆盖保持土壤水分有效性的试验研究,结果表明:在起始条件相同的情况下,同一小区不同深度的土壤含水量是不同的,含水量随着土层深度的增加而增大;不同砾石覆盖厚度条件下,土壤含水量与砾石覆盖厚度成正相关关系;在相同覆盖厚度情况下,砾石粒径越小,覆盖抑制土壤蒸发效果越好,土层含水量也就越高。

Effectiveness of Soil Moisture Keeping Under Different Gravel Cover Conditions

The conditions of soil moisture are main factors to constrain the restoration of vegetation and afforestation in the dry-hot valley of Jinsha River and improving soil moisture is an inevitable approach for ecological restoration and sustainable development of agriculture in this region.In order to provide practical methods for afforestation and crop cultivation in the dry-hot valley,it conducted experimental study on effectiveness of soil moisture keeping under different gravel cover conditions.The outcomes show that: a) under the same initial conditions,the moisture content is different at the different depth of the same plot and the moisture content increase with the increase of soil depth;b) the moisture content and the thickness of gravel cover are in positive correlation under the different thickness of gravel cover conditions;c) under the conditions of same thickness of coverage,the smaller particle size of gravels,the better effect to control the soil evaporation and the higher moisture content will be.