Source Analysis and Control Strategies of Non-Point Source Pollution in Typical Agricultural Small Watershed: A Case Study of Danjiangkou Water Conservation Area
GONG ShiFei,1, DING WuHan2, JU XueHai3, XIAO NengWu,1, YE QingSong1, HUANG Jin1, LI Hu,21Danjiangkou Reservoir of Shiyan Ecological Agriculture Institute, Shiyan 442000, Hubei 2Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081 3Rural Energy & Environment Agency, Ministry of Agriculture and Rural Affairs, Beijing 100125
Abstract 【Objective】The investigation and analysis of agricultural non-point source pollution status in typical small watershed of Danjiangkou Reservoir Area were conducted to parse the pollution load and pollution sources of non-point agricultural sources in this area, so as to provide the reference for formulating targeted prevention and promoting the green development of agriculture. 【Method】Field visits were carried out through questionnaire survey in the Tanjiawan watershed, and the pollution sources, such as planting, breeding and living, were classified in two villages. Meanwhile, the pollution load was estimated according to the export coefficient method approach and the equivalent standard pollution load method. 【Result】The results showed that: the actual load of agricultural non-point source pollution in Tanjiaban watershed decreased from 162.32 t in 2015 to 27.79 t in 2020, the total equivalent standard pollution load decreased from 62.44 m3 to 21.14 m3, and the dominant source of pollution changed from land utilization to livestock and poultry breeding. The total annual loads of TN, TP and COD of agricultural non-point source pollution in the watershed were 5.56, 0.86 and 21.37 t, respectively. The contribution of different pollution sources were found in the following order: livestock and poultry breeding > land utilization > rural life. TN, TP and COD load of pig breeding accounted for 50.91%, 64.20% and 46.66% of the total load of the watershed, respectively, making it the most important source of pollution in the region. TN was the most important non-point agricultural source in the watershed, and its equivalent standard pollution load accounted for 52.6% of the total load, followed by TP, with a pollution load rate of 40.7%, and the minimum equivalent standard pollution load rate of COD was 6.7%. According to the result of environmental pollution risk assessment, the alarm value of livestock and poultry manure load in Tanjiawan watershed was 0.489 and the risk level wasⅡ, indicating the environmental pollution was "slightly". There was still room for expansion of 10 815 pig’s equivalent on the basis of the current total amount of cultivation in the watershed. Since 2015, the intensity of non-point agricultural source pollution in Tanjiawan watershed has been reduced significantly. 【Conclusion】It was of great significance to keep a reasonable amount of livestock and poultry breeding, and to take some effective measures to promote the sustainable emission reduction of non-point agricultural source pollution in the typical watershed of the Danjiangkou Reservoir area. Keywords：Danjiangkou water conservation area;agricultural non-point source pollution;export coefficient method approach;equivalent standard pollution load;typical small watershed
PDF (527KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 龚世飞, 丁武汉, 居学海, 肖能武, 叶青松, 黄进, 李虎. 典型农业小流域面源污染源解析与控制策略——以丹江口水源涵养区为例. 中国农业科学, 2021, 54(18): 3919-3931 doi:10.3864/j.issn.0578-1752.2021.18.011 GONG ShiFei, DING WuHan, JU XueHai, XIAO NengWu, YE QingSong, HUANG Jin, LI Hu. Source Analysis and Control Strategies of Non-Point Source Pollution in Typical Agricultural Small Watershed: A Case Study of Danjiangkou Water Conservation Area. Scientia Acricultura Sinica, 2021, 54(18): 3919-3931 doi:10.3864/j.issn.0578-1752.2021.18.011
Table 5 表5 表5流域等标污染负荷特征 Table 5Characteristics of equivalent standard pollution load
污染物 Pollutant
负荷系数 Load factor
行政村Village
污染源 Pollutant source
Pin (m3·a-1)
Kin
五道岭 Wudaoling
圩坪寺 Weipingsi
农村生活 Rural life
畜禽养殖 Livestock and poultry breeding
土地利用 Land utilization
TN
P1i (m3)
3.26
7.86
0.480
5.660
4.980
11.12
K1i
0.29
0.71
0.043
0.509
0.448
0.526
TP
P1i (m3)
2.20
6.40
0.500
5.500
2.600
8.60
K1i
0.26
0.74
0.058
0.640
0.302
0.407
COD
P1i (m3)
0.45
0.97
0.230
0.660
0.530
1.42
K1i
0.32
0.68
0.161
0.465
0.375
0.067
Pnj (m3·a-1)
5.91
15.23
1.208
11.820
8.112
P=21.14
Knj
0.28
0.72
0.057
0.559
0.384
Pin为第i种污染物的总等标污染负荷（m3·a-1）;Kin为第i种污染物总等标污染负荷比;Pnj为第j个污染源的总等标污染负荷（m3·a-1）;Knj为第j个污染源的总等标污染负荷比 Pin is the equivalent pollution load of the pollutant i（m3·a-1）; Kin is the contribution of the pollutant i; Pnj is the equivalent pollution load of the pollutant j (m3·a-1); Kin is the contribution of the pollutant j
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,1, 丁武汉2, 居学海3, 肖能武
