Effects of Different Thickness of Degradable Plastic Film on the Loss of Dissolved Nitrogen and Phosphorus in Sloping Farmland

1.The Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education;2.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau

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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    Soil nutrient loss of slope farmland can lead to land degradation and non-point source pollution. Degradable mulch film not only has the advantages of polyethylene mulch film, but also is easy to degrade, and is widely used in cultivated land planting. However, the mechanism of its effect on soil nutrient loss is still unclear. To explore the effects of degradable mulch film mulching on runoff and loss of dissolved nitrogen and phosphorus, polyethylene film mulching (PF) with a thickness of 0.003 mm, degradable film mulching with a thickness of 0.006 mm (BF1), 0.008 mm (BF2), 0.010 mm (BF3) and 0.012 mm (BF4), and no mulch (CK) were set up. In in-situ runoff plots, using mulching on ridge tillage peanut planting as the study object, the runoff and concentration of ammonium nitrogen (NH4+-N), nitrate nitrogen (NO3--N), and available phosphorus (PO43--P) in runoff under natural rainfall conditions were measured, and the runoff and nutrient loss characteristics under different thickness of degradable mulch film were analyzed. The results showed that: (1) The degradation time of degradable film increased with the increase of film thickness. (2) The order of cumulative runoff was BF1<BF2<BF3<PF<CK<BF4, and there was significant difference between BF1 and BF4 (P<0.05). (3) Compared with CK, different film mulching can reduce the cumulative loss of nitrogen and phosphorus to varying degrees. BF1 had the most significant effect on reducing the loss of NH4+-N and NO3--N, while BF2 had the most significant effect on reducing the loss of PO43--P. (4)The loss of NO3--N and PO43--P in BF4 was higher than that in other mulches, while the loss of NH4+-N in BF3 was higher than that in other mulches. The results can provide a theoretical basis for the prevention and control of water, soil, and nutrient loss in sloping farmland mulching with plastic film and solving the problems of agricultural non-point source pollution, which is of great importance for the development of green agriculture and sustainable ecological.

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  • Received:June 19,2023
  • Revised:September 08,2023
  • Adopted:October 18,2023
  • Online: January 27,2024
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