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土壤腐殖酸的流失是土壤退化的标志之一。林地被开垦破坏后,土壤腐殖酸的流失程度在坡面上的空间分布与侵蚀方式和侵蚀强度相对应,坡面中部和中下部浅沟沟槽处最为严重,细沟侵蚀区次之,梁峁上部片蚀区相对最弱。侵蚀土壤中的腐殖酸总碳、胡敏酸碳和富啡酸碳含量随开垦年限的增加呈指数减少,其减少程度受侵蚀强度和侵蚀方式的影响。腐殖酸的流失程度与加速侵蚀造成的土壤剖面破坏密切相关。恢复植被可使土壤腐殖酸逐渐增加,土壤肥力得到恢复,土壤退化过程得到逆转。
Soil humus loss is one of the signs of soil degradation. After the woodland was reclaimed and destroyed, the spatial distribution of soil humic acid loss on the slope surface was corresponding to the erosion pattern and erosion intensity. The shallow groove trench was the most serious in the middle and lower part of the slope, followed by the rill erosion area, Beam upper eclipse area is relatively weakest. The contents of humic acid total carbon, humic acid carbon acid and fulvic acid in soil erosion decreased exponentially with the increase of reclamation years, and the degree of reduction was affected by erosion intensity and erosion pattern. The extent of humic acid loss is closely related to soil profile failure caused by accelerated erosion. Restoration of vegetation can increase soil humus gradually, soil fertility is restored, and soil degradation process is reversed.