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

• Published in: Shui tu bao chi xue bao Vol. 38; no. 2; pp. 406 - 413
• Main Authors: WANG Kaili, ZHANG Hanyu, FANG Nufang, LIU Qianjin, LI Jingjiang
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Journal of Soil and Water Conservation 01.04.2024
• Subjects: loss of dissolved nitrogen and phosphorus; natural rainfall; runoff; thickness of degradation film
• ISSN: 1009-2242
• DOI: 10.13870/j.cnki.stbcxb.2024.02.010

[Objective] To explore the effects of degradable mulch film mulching on runoff and loss of dissolved nitrogen and phosphorus. [Methods] 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. [Results] (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 cu