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

doi:10.12302/j.issn.1000-2006.202204036

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. 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

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

CLC Number:

S714.7

YANG Rui, WU Chaoming, ZHU Li, HU Haibo. Study on soil erosion characteristics of economic forest slope field in southern Jiangsu hilly area[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(6): 70-76.

Figures/Tables 6

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Table 2

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Table 3

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References 31

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小区类型 plot type	种植方式 planting pattern	平均高度/m average vegetation height	管理措施 management measures
Ⅰ-桃林peach(with grass)	不除草	3.0	修枝、施肥
Ⅱ-桃林peach(weeding)	除草	3.0	修枝、施肥、定期除草
Ⅲ-裸地bare land(CK)	空白	0.0	定期除草
Ⅳ-茶园tea graden (along slope)	顺坡种植	0.5	施肥、不定期除草
Ⅴ-茶园tea graden (cross slope)	横坡种植	0.5	施肥、不定期除草

小区类型 olot type	径流系数/% runoff coefficient	年径流量/ (m³·km^-2) annual runoff	年侵蚀量/ (t·km^-2) sediment yield
Ⅰ-桃林(有草)peach(with grass)	8.4	1 252.35	106.30
Ⅱ-桃林(无草)peach(weeding)	21.5	3 209.10	237.00
Ⅲ-裸坡(空白)bare land(CK)	40.3	6 016.20	651.74
Ⅳ-茶园(顺坡)tea garden(along slope)	26.8	3 994.50	255.30
Ⅴ-茶园(横坡)tea garden(cross slope)	17.1	2 544.10	180.40

小区类型 plot type	降雨历时 rainfall duration	降雨量 rainfall	平均雨强 average rainfall intensity	I₃₀	径流深 runoff depth	径流系数 runoff coefficient	土壤含水量 soil moisture contents
小区类型 plot type	降雨历时 rainfall duration	降雨量 rainfall	平均雨强 average rainfall intensity	I₃₀	径流深 runoff depth	径流系数 runoff coefficient	雨前 before rainfall	雨后 after rainfall
Ⅰ-桃林(有草)peach(with grass)	0.096	0.639^**	0.508^**	0.601^**	0.559^**	0.102	0.193	0.584^**
Ⅱ-桃林(无草)peach(weeding)	0.240	0.666^**	0.566^**	0.643^**	0.695^**	0.315	0.242	0.223
Ⅲ-裸坡(空白)CK	0.273	0.825^**	0.468^**	0.593^**	0.774^**	0.116	0.283	0.228
Ⅳ-茶园(顺坡)tea garden(along slope)	0.038	0.657^**	0.552^**	0.661^**	0.725^**	0.335^*	0.362^*	0.431^**
Ⅴ-茶园(横坡)tea garden(cross slope)	0.144	0.710^**	0.484^**	0.604^**	0.757^**	0.321^*	0.312	0.316

模型(标准化系数) model	R²	F	P
S_E=0.744 D	0.553	232.688	<0.01
S_E=0.617 D- 0.381 C	0.682	200.824	<0.01
S_E=0.520 D- 0.418 C+ 0.213 I₃₀	0.719	158.823	<0.01
S_E=0.529 D- 0.441 C+ 0.227 I₃₀- 0.119 W₁	0.732	126.519	<0.01
S_E=0.499 D- 0.445 C+ 0.221 I₃₀-0.139 W₁+ 0.101 W₂	0.741	105.786	<0.01

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

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