东北低山丘陵典型区侵蚀沟分布特征及其地形影响研究

doi:10.13249/j.cnki.sgs.2022.10.015

Abstract

Abstract:

The low mountain and hilly areas in Northeast China are important grain producing areas and commercial grain bases. High-intensity agricultural cultivation has caused serious soil erosion and increasing erosion ditch hazards. An area of 106.5 km² in the upper reaches of the East Liaohe River was selected as the study area, and the geometric parameters and latitude and longitude of erosion ditches with length ≥ 50 m and depth ≥ 0.5 m in the study area were verified and measured in the field based on the remote sensing images with 2 m resolution and manual prediction of erosion ditches by GIS. Based on DEM, the spatial information of slope gradient, slope aspect and elevation of erosion gullies was obtained; the basic characteristics and spatial and temporal evolution trends of erosion gullies in the study area were analyzed, and the influence of slope gradient and slope aspect on the development of erosion gullies was discussed. The results show that: 1) There are 322 erosion gullies in the study area, with a distribution density of 3.0 gullies /km², a gully density of 0.8 km/km², and a fragmentation degree of 1.4%. The development of erosion gullies is fast, and the intensity of gully erosion has reached an intense degree, which should be paid enough attention to. 2) Erosion gullies are mainly distributed on sloping arable land from 6° to 9°, the influence of slope gradient on gully erosion is obvious, and the high-intensity reclamation of sloping arable land is the main driving force for the increase of gully erosion. 3) There are more erosion gullies on the sunny slope (S, E, etc.), and least erosion gullies on the shady slope (N). Slope aspect also has a certain influence on gully erosion. The research results provide scientific data for understanding the occurrence and evolution of erosion gullies in low mountain and hilly areas of Northeast China.

Key words: low mountain and hilly regions of Northeast China, erosion gully, geometric parameters, slope gradient, slope aspect

CLC Number:

S157.1

Jiao Peng, Yan Baixing, Ou Yang, Li Mingtang, Ren Ming, Wen Leilei, Cui Hu, Tian Liping, Cheng Lei, Liu Huiping. Distribution Characteristics and Topographic Influence of Erosion Gully in Typical Hilly Region of Northeast China[J].SCIENTIA GEOGRAPHICA SINICA, 2022, 42(10): 1829-1837.

Figures/Tables 6

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References 20

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参数	2011年	2021年		可比条件下的增速
参数	2011年	≥50 m	≥106.7 m	可比条件下的增速
数量/条	143	322	284	98.6%
总长度/km	36.90	84.31	81.38	120.5%
分布密度/（条/km²）	1.34	3.02	2.67	98.6%
沟壑密度/（km/km²）	0.35	0.79	0.76	120.5%

参数	杨树河流域	二道河流域	鸶鹭河流域	大度河流域	研究区
流域面积/km²	43.0	13.6	29.6	20.3	106.5
平均长度/m	219.2	238.1	276.0	301.3	261.8
平均宽度/m	7.8	14.8	18.4	19.6	14.9
平均深度/m	2.5	2.8	3.1	3.9	3.1
平均面积/hm²	0.2	0.4	0.6	0.7	0.5
平均体积/m³	4485.5	9787.2	12598.8	21379.2	12351.1
分布密度（条/km²）	2.5	1.7	3.1	4.9	3.0
沟壑密度（km/km²）	0.6	0.4	0.9	1.5	0.8
割裂度/%	0.5	0.7	1.8	3.2	1.4
垦殖率/%	49.7	51.2	58.3	55.9	53.5
平均坡度/(°)	7.9	7.4	6.3	6.4	7.1

Distribution Characteristics and Topographic Influence of Erosion Gully in Typical Hilly Region of Northeast China

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[2]	Zhang Keli, K. Hosoyamada. SPLASH EROSION PROCESS AND ITS RELATION TO SLOPE GRADIENT [J]. SCIENTIA GEOGRAPHICA SINICA, 1998, 18(6): 561-566.