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[1]Yan Huiying,Li Jianqiang,Yang Shuyuan,et al.Impacts of under-forest Polygonatum kingianum planting on water，soil， nitrogen， and phosphorus losses[J].Research of Soil and Water Conservation,2025,32(04):76-83.[doi:10.13869/j.cnki.rswc.2025.04.026]

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Impacts of under-forest Polygonatum kingianum planting on water，soil， nitrogen， and phosphorus losses

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 04 Page number: 76-83 Column: Public date: 2025-07-10

Title:: Impacts of under-forest Polygonatum kingianum planting on water，soil， nitrogen， and phosphorus losses

Author(s):: Yan Huiying，Li Jianqiang，Yang Shuyuan，Zhao Siqian，Liu Fangyan，Liu Yanjiao，Tang Wenqi; College of Soil and Water Conservation, Southwest Forestry University, Kunming 650224, China

Keywords:: under-forest planting; Polygonatum kingianum; water and soil loss; nitrogen and phosphorus loss

CLC:: S153.6

DOI:: 10.13869/j.cnki.rswc.2025.04.026

Abstract:: [Objective] The study aims to reveal the impacts of planting Polygonatum kingianum Collett &Hemsl(P. kingianum)under forest, to clarify the relationships between rainfall, slope and runoff, sediment yield, and nitrogen and phosphorus loss, and to provide theoretical basis for the assessment and control of water, soil, nitrogen, and phosphorus losses in under-forest traditional Chinese medicinal herb planting models. [Methods] The study was conducted in the P. kingianum cultivation forest in Xundian County, Yunnan Province. The characteristics of water, soil, nitrogen, and phosphorus losses at different slopes(5°, 10°, 15°) under natural rainfall conditions were analyzed using in-situ observation of field runoff. [Results] The average runoff and sediment yield of P. kingianum cultivation forest were 164.44% and 251.16% higher than those in the natural forests, respectively, and increased with slope. The annual average losses of TN, TP, NH4+-N, and NO3--N in P. kingianum cultivation forest were 2.85, 1.75, 4.71, and 2.31 times higher than those in the natural forests, respectively. The main pathways for TN and TP losses were erosion and sedimentation, while the main pathway for NH4+-N and NO3--N losses was surface runoff. There was a highly significant positive correlation between rainfall and runoff, sediment yield, and nitrogen and phosphorus loss.[Conclusion]The planting of P. kingianum significantly increases the amount of water, soil, nitrogen, and phosphorus losses in the forest. Rainfall is the main factor affecting the runoff and nitrogen and phosphorus loss in P. kingianum cultivation forest. However, the sediment yield in P. kingianum cultivation forest is much lower than the tolerable soil loss in southwestern rocky mountainous areas.

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Last Update: 2025-07-20