Experimental Study on Nitrogen Loss in Surface Soil with Polyacrylamide Application

ZHAO Liang; CHENG Gang; SUN Peng-cheng

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Experimental Study on Nitrogen Loss in Surface Soil with Polyacrylamide Application

- Experimental Study on Nitrogen Loss in Surface Soil with Polyacrylamide Application
- Bulletin of Soiland Water Conservation Vol. 32, Issue 5, Pages: 24-28(2013)
- 作者机构：
  
  山西省环境规划院,山西,太原,030002
- 作者简介：
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- Published：2013
- 稿件说明：
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ZHAO Liang, CHENG Gang, SUN Peng-cheng. Experimental Study on Nitrogen Loss in Surface Soil with Polyacrylamide Application[J]. Bulletin of Soiland Water Conservation, 2013, 32(5): 24-28.
DOI：

ZHAO Liang, CHENG Gang, SUN Peng-cheng. Experimental Study on Nitrogen Loss in Surface Soil with Polyacrylamide Application[J]. Bulletin of Soiland Water Conservation, 2013, 32(5): 24-28. DOI：

摘要

地表侵蚀条件下氮素的流失致使表层土壤退化及养分供给能力降低。在室内模拟降雨条件下，重点研究了高分子有机化合物聚丙烯酰胺(PAM)施用对泥沙氮素吸附能力及氮素流失水平的影响。试验施氮用肥为尿素，施氮水平设定为270kg/hm

，试验设定3个PAM施用水平(0，1和2g/m

)，并设置不施氮也不施PAM作为对照处理，每个处理3次重复。试验分别在2个降雨强度(50和80mm/h)下进行。结果表明，PAM可以很好地维持土壤结构的稳定性，抑制地表细沟侵蚀的产生，从而有效地降低侵蚀产沙的水平。PAM的施用增强了泥沙对氮素的吸附水平，所以施用PAM的处理地表氮素流失仍明显减少，且氮素流失过程表现出与产沙过程很好的一致性，这说明PAM减少氮素流失的原因在于控制侵蚀产沙的水平。PAM的施用可以有效抑制地表泥沙和氮素的流失。

Abstract

Nitrogen loss under the condition of soil erosion leads to degradation of surface soil and decrease in nutrient supply.The objective of the study was mainly focused on the effect of polyacrylamide(PAM

a high molecular weight organic compound) application on nitrogen absorption ability on sediment and nitrogen loss under simulated rainfall.N fertilizer was urea

applied at the level of 270 kg/hm2.The experiment consisted of 3 PAM application rates(0

1 and 2 g/m2)

with no urea and no PAM application as control treatment

and was conducted at two rainfall intensities of 50 and 80 mm/h.Each treatment was repeated three times.Results showed that the PAM could reduce soil erosion by stabilizing surface soil structure and controlling rill erosion.The PAM application enhanced nitrogen absorption ability on sediment and thus

nitrogen loss in the PAM added treatments decreased obviously and had a strong correlation with sediment process

which implies that the reduction of nitrogen loss by the PAM was mainly caused by controlling soil erosion and sediment yield.The research confirmed that the addition of PAM

had favorable effects in reducing surface sediment and nitrogen loss.

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