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土壤中溶解性溶质流失特征试验 被引量:6
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作者 童菊秀 杨金忠 暴入超 《农业工程学报》 EI CAS CSCD 北大核心 2010年第6期77-82,共6页
该文以含有一定初始溶质的壤土和沙土为试验材料,为了研究不同条件下土壤溶质的流失特征,考虑到农田在产生地表径流前存在地表积水的过程,进行了室内土壤测试试验。试验结果表明:在相同条件下,既存在地表径流又存在地下排水时,损失的土... 该文以含有一定初始溶质的壤土和沙土为试验材料,为了研究不同条件下土壤溶质的流失特征,考虑到农田在产生地表径流前存在地表积水的过程,进行了室内土壤测试试验。试验结果表明:在相同条件下,既存在地表径流又存在地下排水时,损失的土壤溶质仅有小部分存在于地表径流水中,流失在地下排水中的溶质占损失的土壤溶质的主要成分。因此在实际田间操作中,当不能同时采用降低地表径流和地下排水的方法来提高土壤溶质的利用程度时,应首先考虑降低地下排水的措施。而在暴雨范围内,降雨强度越小、土壤初始含水率越低、地下排水条件越好、土壤质地越粗等都将导致土壤溶质在地表径流和地下排水中流失的质量越大,从而降低土壤溶质的有效利用程度,该成果可以为提高土壤溶质的利用效率和降低农业污染提供一定的参考意义。 展开更多
关键词 径流 排水 土壤测试 壤土和沙土 暴雨强度 土壤溶质流失特征
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Potential Role of Feldspathic Sandstone as a Natural Water Retaining Agent in Mu Us Sandy Land,Northwest China 被引量:52
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作者 HAN Jichang XIE Jiancang ZHANG Yang 《Chinese Geographical Science》 SCIE CSCD 2012年第5期550-555,共6页
This paper analyzed the water-retention mechanism of feldspathic sandstone (fine-(〈 1 mm diam.) and gravel-sized (2-3 cm diam.) in Mu Us Sandy Land, Northwest China. The objective of this study is to study the e... This paper analyzed the water-retention mechanism of feldspathic sandstone (fine-(〈 1 mm diam.) and gravel-sized (2-3 cm diam.) in Mu Us Sandy Land, Northwest China. The objective of this study is to study the effect of feldspathic sandstone amendment on water retention in sandy land. The results showed that as the proportion of fine feldspathic sandstone in the sandy land soil increased, the soil texture changed from sand to silt loam, the capillary po- rosity gradually increased from 26.3% to 44.9%, and the soil saturated hydraulic conductivity decreased from 7.10 ram/rain to 0.07 mm/min. Feldspathic sandstone gravel formed micro-reservoirs in the sandy land soil, playing the role of a 'water absorbent' and 'water retaining agent' in sandy land. Amendment with feldspathic sandstone can increase water retention in the arable layer of sandy land by 67%. This study provides a theoretical basis for the amelioration of sandy land on a large scale. It can be concluded that amendment with feldspathic sandstone can improve the physical properties of sandy land soil and increase soil water retention. 展开更多
关键词 feldspathic sandstone sandy land soil water retaining agent Mu Us Sandy Land soil saturatd hydraulicconductivity
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