JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (6): 70-76.doi: 10.12302/j.issn.1000-2006.202204036

Special Issue: 山水林田湖草一体化保护和生态修复——土壤侵蚀修复研究

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Study on soil erosion characteristics of economic forest slope field in southern Jiangsu hilly area

YANG Rui1(), WU Chaoming2, ZHU Li2, HU Haibo1,*()   

  1. 1. College of Forestry and Grassland, College of Soil and Water Conservation, Nanjing Forestry University, Nanjing 210037, China
    2. Wuxi Branch Bureau of Investigation on Hydrologic Water Resources, Jiangsu Province, Wuxi 214100, China
  • Received:2022-04-15 Revised:2022-07-29 Online:2023-11-30 Published:2023-11-23

Abstract:

【Objective】 This study aims to explore the characteristics of surface runoff and sediment yield of economic forest land with different planting and management measures in the hilly region of Southern Jiangsu. 【Method】 Analyzing the process of runoff and sediment yield on the slope based on the observation data of runoff plots in Wuxi Yixing City in 2021. 【Result】 ① In the hilly region of Southern Jiangsu, the runoff and sediment yield of economic forest mainly occurred from May to August, in which the runoff and soil erosion yield of different runoff plots accounted for more than 72.5% and 68.7%, respectively. ② The comparison of slope runoff and erosion in different runoff plots is as follows: Ⅰ-peach forest (with grass) <Ⅱ-peach forest (weeding), and compared with Ⅱ, the annual runoff reduction of Ⅰwas 156.3% and the annual soil erosion reduction was 122.9%; Ⅴ-tea garden (cross slope) < Ⅳ-tea garden (along slope), and compared with Ⅳ, Ⅴ had an annual runoff reduction of 57.0% and erosion reduction of 41.5%. In addition to it, the annual runoff of different economic forest slopes was reduced by 50.6%-380.4%, and the annual soil erosion was reduced by 155.3%-513.1% compared with Ⅲ-bare slope (blank). ③ The maximum runoff and erosion of the Ⅰ-Ⅴ plots accounted for 15.3%, 14.5%, 10.8%, 12.5%, 14.4% and 7.9%, 6.3%, 4.5%, 7.1%, 8.0% of the total, respectively. It can be seen that high-intensity rainfall has an important impact on slope soil erosion. 【Conclusion】 Soil erosion in runoff plots of different economic forests was significantly positively correlated with rainfall, average rainfall intensity, I30 and runoff depth, and the correlation with soil water content before rainfall was complex, in which soil erosion had the closest relationship with runoff depth (R2=0.553).

Key words: non-wood forest, cropping pattern, soil erosion, runoff and sediment, southern Jiangsu hilly area

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