[1]YANG Xin,WANG Keqin,SONG Yali,et al.Characteristics of Nitrogen and Phosphorus Losses Under Different Land-use Types in Red Soil Hilly Area in Central Yunnan Province[J].Research of Soil and Water Conservation,2020,27(03):23-29.
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Characteristics of Nitrogen and Phosphorus Losses Under Different Land-use Types in Red Soil Hilly Area in Central Yunnan Province
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 03
Page number:
23-29
Column:
目次
Public date:
2020-04-20
- Title:
- Characteristics of Nitrogen and Phosphorus Losses Under Different Land-use Types in Red Soil Hilly Area in Central Yunnan Province
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- Three land use types(forest, shrub and farmland)in Cangfang small watershed in central Yunnan Province were studied as the research sites to reveal the characteristics of runoff and nitrogen and phosphorus losses in slope lands with different land use types in red soil hilly area. Runoff, nitrogen and phosphorus loss forms, concentrations and loss amounts of different land use types were measured during natural rainfall in rainy season in 2018. Characteristics of runoff, nitrogen and phosphorus losses in red soil hilly region were studied. The results showed that:(1)there was a significant positive correlation between runoff and rainfall and rainfall intensity under different land use types; the total runoff increased in the order: forest land(20.12 L/m2)<shrub land(23.80 L/m2)<farmland(34.34 L/m2); the variation coefficients of various land use types ranged from 0.14 to 0.64, and the difference was significant;(2)under natural rainfall conditions, the average concentrations of TN, NO-3-N and NH+4-N increased in the order: forest land(3.20, 2.08 and 0.50 mg/L)<shrub land(4.09, 2.57 and 0.58 mg/L)< armland(4.95, 3.16 and 0.88 mg/L), TP and PO-4-P increased in the order: forest land(3.43 and 1.95 mg/L)<shrub land(4.33 and 2.57 mg/L)<farmland(5.82 and 3.61 mg/L);(3)dissolved nitrogen and phosphorus were the main pollutants of nitrogen and phosphorus pollution in runoff, among which NO-3-N and PO-4-P were the main forms in runoff(56.81%～77.41% and 50.12%～76.64%);(4)the total losses of TN and TP under different land use types increased in the order: forest land(59.96 and 65.47 mg/m2)<shrub land(98.92 and 102.95 mg/m2)<farmland(170.28 and 200.94 mg/m2). Therefore, the nitrogen and phosphorus losses in the watershed can be reduced by increasing the areas of forestland and shrub land, and the conversion of farmland to forest and shrub land can be carried out, so as to slow down and prevent the soil erosion in the red soil hilly area of Yunnan Province.
- References:
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Last Update:
2020-04-30