黄土高原退耕还林措施对深层土壤含水率的影响
发布时间：2019-04-24 23:02
【摘要】：深层土壤水分分布状况对于黄土高原植被恢复和农业可持续发展意义重大。对陕北黄土区不同退耕还林措施(1979年种植的侧柏林、油松林和苹果林)及农地(对照)20 m深土壤剖面的土壤水分、根系分布状况及土壤粘粒含量进行了取样分析。结果表明:退耕还林措施显著降低了土壤含水率,总体表现为农地(11.30%)苹果林(6.66%)≈油松林(6.48%)≈侧柏林(5.92%)。深层土壤含水率同时受植物根系和土壤质地的影响,植物根系是影响4~10 m土壤含水率的主要因素,根系通过吸水作用降低了土壤含水率,但随着深度的增加,根系对土壤含水率的影响逐渐减弱,土壤质地对土壤含水率的影响逐渐增强,土壤含水率与土壤粘粒含量之间呈正相关关系。侧柏人工林根系影响土壤水分深度可达18 m,油松林的影响深度为16 m,35 a树龄的苹果林耗水深度为19 m左右。
[Abstract]:The distribution of deep soil moisture is of great significance for vegetation restoration and agricultural sustainable development in the Loess Plateau. The soil moisture, root distribution and clay content of 20 m deep soil profile in loess area of northern Shaanxi Province were analyzed by sampling and analyzing the soil moisture, root distribution and clay content of different measures for returning farmland to forest (Berlin, Pinus tabulaeformis and apple forest planted in 1979) and farmland (control) 20 m deep soil profile. The results showed that the soil moisture content was significantly reduced by the measures of returning farmland to forest, which showed that farmland (11.30%) apple forest (6.66%) 鈮，
本文编号：2464867
[Abstract]:The distribution of deep soil moisture is of great significance for vegetation restoration and agricultural sustainable development in the Loess Plateau. The soil moisture, root distribution and clay content of 20 m deep soil profile in loess area of northern Shaanxi Province were analyzed by sampling and analyzing the soil moisture, root distribution and clay content of different measures for returning farmland to forest (Berlin, Pinus tabulaeformis and apple forest planted in 1979) and farmland (control) 20 m deep soil profile. The results showed that the soil moisture content was significantly reduced by the measures of returning farmland to forest, which showed that farmland (11.30%) apple forest (6.66%) 鈮，
本文编号：2464867
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