[1]WU Xiaoni,FU Denggao,PENG Peiyuan,et al.Identifying Key Areas of Agricultural Non-Point Source Pollution Control Based on Ecological Stoichiometry[J].Research of Soil and Water Conservation,2020,27(05):160-165.
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Identifying Key Areas of Agricultural Non-Point Source Pollution Control Based on Ecological Stoichiometry
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 05
Page number:
160-165
Column:
目次
Public date:
2020-08-20
- Title:
- Identifying Key Areas of Agricultural Non-Point Source Pollution Control Based on Ecological Stoichiometry
- Keywords:
- ecological stoichiometry; non-point source pollution; nutrient available; pollution transport
- CLC:
- X53
- DOI:
- -
- Abstract:
- Based on the nitrogen(N)and phosphorus(P)concentrations in soil and surface runoff from different landscape units in the Chaihe catchment, the eco-stoichiometric characteristics of pollutants were analyzed. The key control area of non-point source pollution was then identified in the catchment according to the comprehensive evaluation values of the source-flow processes using ecological stoichiometry. The results showed that:(1)soils in the flat lands and the greenhouse area and sediment in the Chaihe river had higher values of N:P ratios; the values of the dissolved N and P ratio in the runoff were also higher; in contrast, the values of N:P ratio in soil and runoff in P-mining area and forests in P-enriched area were relatively low;(2)there were no significant correlations between soil nutrients and pollutants in runoff;(3)compared to other landscape units, the higher values of pollutant source were found in the sediment of the Chaihe river and the soil in the greenhouse area, and the higher risk of pollutant flow in runoff was found in the greenhouse areas and the P-mining area; consequently, the greenhouse area was considered as the key area of pollutant control in the catchment area due to its high-risk values of pollutant source and flow;(4)according to the proportion of the pollutant source and flow processes, the pollutant flow process in the P-mining area and pollutant source in forests of P-enriched area and river sediment were considered as the key aspects of the non-point source pollution control in each landscape; non-point source pollution in farmlands(slope farmland, flatland, and greenhouse area)should be simultaneously controlled in processes of the soil pollutant source and pollutant flow in runoff.
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Last Update:
2020-08-25