【摘要】：深層土壤水分分布狀況對于黃土高原植被恢復(fù)和農(nóng)業(yè)可持續(xù)發(fā)展意義重大。對陜北黃土區(qū)不同退耕還林措施(1979年種植的側(cè)柏林、油松林和蘋果林)及農(nóng)地(對照)20 m深土壤剖面的土壤水分、根系分布狀況及土壤粘粒含量進(jìn)行了取樣分析。結(jié)果表明:退耕還林措施顯著降低了土壤含水率,總體表現(xiàn)為農(nóng)地(11.30%)蘋果林(6.66%)≈油松林(6.48%)≈側(cè)柏林(5.92%)。深層土壤含水率同時受植物根系和土壤質(zhì)地的影響,植物根系是影響4~10 m土壤含水率的主要因素,根系通過吸水作用降低了土壤含水率,但隨著深度的增加,根系對土壤含水率的影響逐漸減弱,土壤質(zhì)地對土壤含水率的影響逐漸增強(qiáng),土壤含水率與土壤粘粒含量之間呈正相關(guān)關(guān)系。側(cè)柏人工林根系影響土壤水分深度可達(dá)18 m,油松林的影響深度為16 m,35 a樹齡的蘋果林耗水深度為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，

本文編號：2464867