Contribution of Colloidal Phosphorus Loss in Runoff of Paddy Surface Water and Drainage

YAN Dawei; LIANG Xinqiang; WANG Feier; ZHOU Junjie; ZHOU Xiaoying; TIAN Guangming

doi:10.13870/j.cnki.stbcxb.2019.06.007

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Contribution of Colloidal Phosphorus Loss in Runoff of Paddy Surface Water and Drainage

更新时间：2025-03-12

- Contribution of Colloidal Phosphorus Loss in Runoff of Paddy Surface Water and Drainage
- Vol. 33, Issue 6, Pages: 47-53(2019)
- 作者机构：
  
  浙江大学环境与资源学院,杭州,310058
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2019.06.007
  CLC：
- Published：2019
- 稿件说明：
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YAN Dawei, LIANG Xinqiang, WANG Feier, et al. Contribution of Colloidal Phosphorus Loss in Runoff of Paddy Surface Water and Drainage[J]. 2019, 33(6): 47-53.
DOI：

YAN Dawei, LIANG Xinqiang, WANG Feier, et al. Contribution of Colloidal Phosphorus Loss in Runoff of Paddy Surface Water and Drainage[J]. 2019, 33(6): 47-53. DOI： 10.13870/j.cnki.stbcxb.2019.06.007.

摘要

通过野外试验采集稻田田面水和稻田排水径流的水样，研究了胶体磷流失贡献和流失规律。根据实际天气情况，选择1次典型暴雨事件（48 mm/h）和8次不同强度（8，9，19，23，23，32，36，49 mm/h）的降雨事件采集样品。结果表明：（1）田面水和稻田排水中磷素流失形式以颗粒磷为主。在过1 μm滤膜的总磷中，胶体磷的流失贡献为21%~73%，超过真溶解磷的流失贡献。（2）降雨后田面水中胶体磷的贡献范围为9%~44%，稻田排水中胶体磷流失贡献范围为10%~16%，金属氧化物胶体、有机质胶体以及金属氧化物-有机质胶体浓度与胶体磷流失贡献呈正向相关性，田面水中皮尔森相关系数分别为0.544，0.635，0.781（p<0.05），稻田排水中分别为0.734，0.350，0.747（p<0.05），三者结合磷为径流中胶体磷的重要赋存形态。（3）施肥通过影响电导率和离子强度来削减胶体磷的流失贡献，而降雨强度则通过影响pH来增加胶体磷的流失贡献，降雨强度与稻田排水胶体磷流失浓度的线性回归系数R2=0.75，但两者对田面水和稻田排水中胶体磷流失贡献的影响程度不同。

Abstract

In order to reveal the contribution of colloidal phosphorus to the loss of total phosphorus

we carried out a field experiment to collect the water of paddy surface and ditches under typical rainfall events. According to the actual weather conditions

we selected a typical rainstorm event (48 mm/h) and eight rainfall events with different intensities of 8

and 49 mm/h. The results showed that:(1) Phosphorus loss in the surface water and paddy field drainage was mainly composed of particle phosphorus. In the total phosphorus passed over the 1 μm filter

the loss of colloidal phosphorus accounted for 21%~73%

even exceeding the loss contribution of true dissolved phosphorus. (2) The contribution of colloidal phosphorus in the surface water after rainfall was 9%~44%

and the contribution of colloidal phosphorus loss in paddy field drainage was 10%~16%. There was positively correlation among metal oxide colloid

organic colloid

metal oxide-organic colloid and colloidal phosphorus loss contribution. The correlation coefficients in the surface water were 0.544

0.635

0.781 (p<0.05)

and the corresponding values in the drainage in the paddy field were 0.734

0.350

0.747 (p<0.05)

respectively. They were the important forms of colloidal phosphorus in runoff. (3) Fertilization reduced the contribution of colloidal phosphorus loss by affecting conductivity and ionic strength

while rainfall intensity increased the contribution of colloidal phosphorus loss by affecting pH value. The R2 value of linear regression coefficient of rainfall intensity and colloidol phosphorus concentration of drainage in the paddy field was 0.75

but the degree of influence on the loss of colloidal phosphorus in the surface water and rice field drainage was different.

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