【摘要】：采用變坡試驗(yàn)水槽的方法,研究了黃土高原丘陵區(qū)退耕3年草地(賴草)和退耕17年草地(紫花苜蓿)在生長(zhǎng)季土壤分離過程的季節(jié)變化及其影響因素。結(jié)果表明:賴草和紫花苜蓿地的土壤分離能力在整個(gè)生長(zhǎng)季均呈現(xiàn)顯著下降的季節(jié)變化趨勢(shì)(p0.05)。賴草地的平均土壤分離能力最大(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);兩種草地土壤分離能力的季節(jié)變化主要受到土壤硬化、水穩(wěn)性團(tuán)聚體和草地根系生長(zhǎng)的影響,隨土壤粘結(jié)力、容重、水穩(wěn)性團(tuán)聚體和草地根系密度的增加,兩種退耕草地的土壤分離能力均呈指數(shù)形式下降;兩種草地土壤分離能力的季節(jié)變化可以用水流剪切力、土壤容重和草地根系密度很好的模擬。為黃土高原地區(qū)退耕還林(草)水土保持措施提供科學(xué)依據(jù)。
[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 鹵0.036 kg m 鈮，

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