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[1]SU Mengbai,WANG Keqin,SONG Yali,et al.Reduction Effect of Returning Farmland to Forest on the Losses of Nitrogen and Phosphorus on the Slope of the Jianshan River in Central Yunnan[J].Research of Soil and Water Conservation,2023,30(03):154-162.[doi:10.13869/j.cnki.rswc.2023.03.026]

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Reduction Effect of Returning Farmland to Forest on the Losses of Nitrogen and Phosphorus on the Slope of the Jianshan River in Central Yunnan

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 154-162 Column: Public date: 2023-04-10

Title:: Reduction Effect of Returning Farmland to Forest on the Losses of Nitrogen and Phosphorus on the Slope of the Jianshan River in Central Yunnan

Author(s):: SU Mengbai¹, WANG Keqin¹, SONG Yali¹, HONG Lida²; (1.College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China; 2.Water Conservancy Bureau of Chengjiang, Chengjiang, Yunnan 652500, China)

Keywords:: nitrogen and phosphorus reduction; conversion of cropland to forestland; Jianshan River watershed

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.03.026

Abstract:: [Objective]It is of great guiding significance for evaluating the reduction effect of the ecological project of returning farmland to forests on the protection of water environment and non-point source pollution in the river watershed to explore the dynamic change characteristics of erosive rainfall, nitrogen and phosphorus loss concentrations and loss amounts of different land types under the measures of returning farmland to forests in the Jianshan River watershed of central Yunnan Province. [Methods] Jianshan River watershed, a typical watershed in Fuxian Lake area, was selected as the study area. The main research objects were returning farmland to forest/sloping farmland, artificial forest, shrub forest and secondary forest in the watershed. Through quantitative monitoring in the different land use type runoff area in rainy season(May—October)for three consecutive years(2017—2019), the concentration, amount and dynamic characteristics of erosive rainfall, nitrogen and phosphorus losses were studied. [Results]The annual erosive precipitation and annual runoff after returning farmland to forests decreased by 37.16% and 42.75%, respectively. Runoff decreased by 95.88% and 94.29%, respectively. The export concentrations of of total nitrogen, nitrate, ammonium nitrogen, total phosphorus, and phosphate reduced by 34.32%, 32%, 61%, 73.4% and 70.4%, respectively. The non-point source pollutantoutputs of for TN, NO^-₃-N, NH⁺₄-N, TP and PO^3-₄-P decreased 70.40 mg/m², 41.24 mg/m², 20.56 mg/m², 162.16 mg/m²,and 107.38 mg/m², respectively. The reduction rates were 79.29%, 80.48%, 88.20%, 95.66% and 97.06%, respectively. The output concentrations of TN, NO^-₃-N, NH⁺₄-N, TP and PO^3-₄-P of slope farmland before conversion were 156.80%, 149.57%, 173.15%, 157.42% and 153.82% of those of other land use types, respectively. After two years, they were 139.00%, 117.66%, 108.08%, 123.18% and 92.29% respectively, which were still higher than those of other land use types in the watershed, but the reduction and control effects on nitrogen and phosphorus had increased year by year. [Conclusion] The restoration of farmland to forests in the Jianshan River watershed has effectively improved the status of non-point source pollution and soil erosion in the watershed, and provided scientific basis and data support for the governance of the water environment in the lakeside watershed.

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Last Update: 2023-04-10