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作 者 ：张兴昌,邵明安,黄占斌,卢宗凡

期 刊 ：生态学报 2000年 20卷 6期 页码：1038~1044

关键词：植被类型；土壤侵蚀；氮素流失；

Keywords:vegetation type, soil erosion, nitrogen loss,

摘 要 ：利用 5～ 6a野外径流小区试验资料 ,研究 1 7种植被覆盖对土壤侵蚀和氮素流失的影响 ,结果表明 :1 9种作物、4种草地和 4种草灌间作小区年平均径流量为 2 7773、1 80 2 8和 1 31 4 9m3/ km2 · a,比相应裸地减少 2 7.5%、51 .1 %和64.3% ;侵蚀模数为 1 71 6、1 0 2 1和 81 2 t/ km2 · a,减少 73.0 %、92 .8%和 94 .3% ;全氮富集率为 1 .65、2 .4 8和 2 .59,比裸地增加 1 3.8%～ 1 1 4 % ;年平均土壤氮素流失量为 1 4 58、1 2 52、382 9和 966kg/ km2· a。 2植被通过调节径流流速来间接影响泥沙全氮富集 ,土壤侵蚀模数愈大 ,泥沙全氮富集率愈小。 3土壤氮素流失方程 SN=( 55.56-4 .87ln SL)· SL·TN ,可定量预测土壤氮素的流失。

Abstract:The soil erosion and N loss by erosion as affected by vegetation was conducted in field runoff plots for 5～6 years. The results showed that the mean runoff amounts of 9 crops, 4 grasses, 4 grass shrubs fields were of 27773,18028 and 13149 m 3/km 2·a respectively, which were 27.5%, 51.1% and 64.3% lower than bare land. Their erosion modules were 1716, 1021 and 812t/km 2·a,which were 73 0%, 92.8% and 94.3% lower respectively than the bare land respectively. Their mean loss amounts of nitrogen by sediment...

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