植被刈割对红壤酸度及有机无机复合状况的影响

摘要

在红壤地区自然植被(白茅)条件下，不同的刈割周期对土壤交换性盐基离子组成、土壤有机质、有机无机复合体、腐殖质组成及铁、铝氧化物含量等均具有较大的影响。从1年刈割一次至6年刈割一次处理，虽然土壤酸度的变化无明显规律，但土壤交换性钾、无定形铁、无定形铝、络合态铁的含量及铁活化度值均呈增加趋势，且土壤有机质和复合体的含量相应增高，松结态腐殖质／紧结态腐殖质的比值亦增大，即腐殖质的活性较强、质量较高，土壤肥力在一定程度上得以进化；而交换性钠、交换性钙及游离铁、铝氧化物的含量则呈相应的下降趋势。%Based on the long-term experiments of different cutting frequency of natural vegetation (Imperata cylindrica var. major), in red soils of south of Hunan Province, the changes of contents of organo-mineral complex, acidity and Fe, Al oxides were studied. The results showed that the changes of the soil acidity were not any regular,but the contents of organic matter, organo-mineral complex, exchangeable K, amorphous Fe and Al, complex Fe and value of loosely combined/ tightly combined, activation degree of Fe in the soil had a tendency of increasing, whereas the contents of exchangeable Na and Ca, free Fe and Al were decreased relatively when the cutting frequency treatments from one year to 6 years.