黄土丘陵区退耕草地土壤分离能力季节变化研究

发布时间：2019-05-17 00:31

【摘要】：采用变坡试验水槽的方法,研究了黄土高原丘陵区退耕3年草地(赖草)和退耕17年草地(紫花苜蓿)在生长季土壤分离过程的季节变化及其影响因素。结果表明:赖草和紫花苜蓿地的土壤分离能力在整个生长季均呈现显著下降的季节变化趋势(p0.05)。赖草地的平均土壤分离能力最大(0.076±0.036 kg m-2 s-1),其次是紫花苜蓿地(0.057±0.055 kg m-2 s-1);两种草地土壤分离能力的季节变化主要受到土壤硬化、水稳性团聚体和草地根系生长的影响,随土壤粘结力、容重、水稳性团聚体和草地根系密度的增加,两种退耕草地的土壤分离能力均呈指数形式下降;两种草地土壤分离能力的季节变化可以用水流剪切力、土壤容重和草地根系密度很好的模拟。为黄土高原地区退耕还林(草)水土保持措施提供科学依据。
[Abstract]:The seasonal variation and influencing factors of soil separation in the hilly region of the Loess Plateau during the growing season were studied by using the method of variable slope test flume to study the seasonal variation and influencing factors of the grassland (Leymus chinensis) and the grassland (Medicago sativa) during the growing season in the hilly region of the Loess Plateau. The results showed that the soil separation ability of Leymus chinensis and Medicago sativa decreased significantly in the whole growing season (p0.05). The average soil separation ability of Lai grassland was the highest (0.076 卤0.036 kg m 鈮，

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