次降雨过程中北京市不同土地利用方式下土壤养分流失特征
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X171;S157.1

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国家自然科学基金(20134465);林业厅创新课题(NZ20140506)


Characteristics of Soil Nutrients Loss Under Different Land Use Patterns in Beijing During Course of Rain
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    摘要:

    研究了次降雨过程中北京市不同土地利用方式下(草地、农田、林地和果园)土壤养分流失特征。结果表明:(1)在不同土地利用方式下,地表径流量的变化均随着降雨时间的增加呈对数变化趋势,在同一降雨时间内,地表径流量均表现为草地>农田>林地>果园。(2)草地泥沙流失量随降雨历时幅度较大,在降雨后期出现陡增陡降的变化趋势,其他3种土地利用方式下泥沙流失量的增加幅度较小;不同土地利用方式下泥沙流失量大小顺序为:草地>农田>林地>果园。(3)草地和农田地表径流量显著高于林地和果园(P<0.05),地表径流量和壤中流均表现为:草地>农田>果园>林地;从壤中流总量变化特征来看,草地和农田产生的壤中流显著高于林地和果园(P<0.05)。(4)不同土地利用方式下泥沙积累量均随降雨历时而呈指数的变化趋势。(5)不同土地利用方式下水相氮磷流失量、泥沙氮磷流失量和氮磷流失总量均表现为:草地>农田>果园>林地。(6)降雨径流过程中,不同土地利用方式下磷的流失是以侵蚀泥沙相为主,氮素的流失以径流水相为主。(7)不同土地利用方式降雨前期土壤全氮和全磷含量大小基本表现为:草地>农田>林地>果园,泥沙N和P含量比雨前土壤表层N和P含量有所增加,说明侵蚀泥沙对N和P具有一定的富集作用,并且不同土地利用方式下侵蚀泥沙对P的富集高于对N的富集,综合比较可知,草地侵蚀泥沙富集养分的能力最高。(8)不同土地利用方式下泥沙量与侵蚀泥沙中全氮和全磷含量均存在显著或者极显著的正相关关系(P<0.05),与土壤全氮和全磷含量存在不同的正相关关系(相关系数较低),说明侵蚀泥沙量的增加会引起泥沙中养分含量不同程度的增加效应,并且草地和农田侵蚀量与养分含量的相关系数高于林地和果园。

    Abstract:

    Characteristics of soil nutrients loss under different land use patterns in Beijing during course of rain were studied. The results indicated that: (1) The surface runoff under different land use patterns had a logarithmic change tendency with the increasing of rain, which ordered grassland>farmland>woodland>orchard. (2) The increasing range of soil erosion of grassland was larger, and farmland, woodland, orchard was lower, which ordered grassland>farmland>woodland>orchard. (3) The surface runoff and interflow of grassland and farmland were significant higher than woodland and orchard (p<0.05), which ordered grassland>farmland>orchard>woodland. (4) The sediment accumulation under different land use patterns had a exponential function change tendency with the increasing of rain, which ordered grassland>farmland>woodland>orchard. (5) The nitrogen and phosphorus loss in water, sediment nitrogen and phosphorus loss and the total loss of nitrogen and phosphorus ordered grassland>farmland>orchard>woodland. (6) The loss of nitrogen in runoff water, and the loss of phosphorus in erosive sediment under different land use patterns. (7) The total content of nitrogen and phosphorus under different land use patterns antecedent rainfall ordered grassland>farmland>woodland>orchard. The sediment ratio of N/P was higher than that of ratio of N/P antecedent rainfall which indicated that erosion and sediment had an effect of nitrogen and phosphorus enrichment, and the nitrogen enrichment was higher than phosphorus enrichment, which the grassland had the most highest nutrients enrichment. (8) The sediment had a significant or extremely significant positive correlation with the nutrients of sediment, and had a different positive correlation with the nutrients of soil, which implied that the sediment yield could cause the increase of various kinds of nutrients.

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史佳良, 王秀茹, 李淑芳, 李 宁.次降雨过程中北京市不同土地利用方式下土壤养分流失特征[J].水土保持学报,2016,(5):58~63

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  • 在线发布日期: 2016-10-31
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