不同生长期大豆坡耕地土壤抗侵蚀能力特征
发布时间：2019-05-15 14:57
【摘要】：土壤抗侵蚀能力特征是土壤侵蚀预测预报的重要依据之一,为了分析黄土区不同生长期大豆坡耕地土壤抗侵蚀能力特征,采用原状土冲刷槽和静水崩解法,分别在大豆不同生长期测定坡耕地不同土层土壤抗冲性和抗蚀性,并对大豆根系特征与土壤抗侵蚀能力的关系进行分析。结果表明:随着大豆生育期的推进呈现出先增强后减弱的趋势,始粒期土壤抗侵蚀能力最强,苗期最弱;在大豆苗期与分枝期,土壤抗侵蚀能力随土层深度的增加而减弱;大豆开花期以后10~20 cm土层土壤抗侵蚀能力最强,其次为0~5 cm土层;土壤根重密度、根系表面积、根系体积及根系长度对土壤抗侵蚀能力影响均达到极显著水平(p0.01),且根径在0~0.5 mm之间根系的增多会更加有效地提高土壤的抗侵蚀能力。这表明在大豆生长初期加强对坡面的有效防护,避免地表长期裸露,培育根系发达的大豆品种将有助于对坡耕地土壤侵蚀的防控。
[Abstract]:The characteristics of soil erosion resistance are one of the important bases for soil erosion prediction and prediction. In order to analyze the characteristics of soil erosion resistance of soybean sloping farmland at different growth stages in loess area, the original soil scouring trough and static water collapse method were adopted. The soil scour resistance and corrosion resistance of different soil layers of sloping farmland were measured at different growth stages of soybean, and the relationship between root characteristics and soil erosion resistance of soybean was analyzed. The results showed that with the advance of soybean growth period, the soil erosion resistance was the strongest and the weakest at the initial grain stage, and the soil erosion resistance decreased with the increase of soil depth at seedling stage and branch stage. After flowering, the soil erosion resistance of 10 脳 20 cm soil layer was the strongest, followed by 0 脳 5 cm soil layer. The effects of soil root weight density, root surface area, root volume and root length on soil erosion resistance were very significant (p0.01). The increase of root diameter between 0 鈮，
本文编号：2477586
[Abstract]:The characteristics of soil erosion resistance are one of the important bases for soil erosion prediction and prediction. In order to analyze the characteristics of soil erosion resistance of soybean sloping farmland at different growth stages in loess area, the original soil scouring trough and static water collapse method were adopted. The soil scour resistance and corrosion resistance of different soil layers of sloping farmland were measured at different growth stages of soybean, and the relationship between root characteristics and soil erosion resistance of soybean was analyzed. The results showed that with the advance of soybean growth period, the soil erosion resistance was the strongest and the weakest at the initial grain stage, and the soil erosion resistance decreased with the increase of soil depth at seedling stage and branch stage. After flowering, the soil erosion resistance of 10 脳 20 cm soil layer was the strongest, followed by 0 脳 5 cm soil layer. The effects of soil root weight density, root surface area, root volume and root length on soil erosion resistance were very significant (p0.01). The increase of root diameter between 0 鈮，
本文编号：2477586
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