SPATIOTEMPORAL VARIATION OF BLACK SOIL LAYER THICKNESS IN BLACK SOIL REGION OF NORTHEAST CHINA
LIU Kai1,2,3, WEI Ming-hui1,2,3, DAI Hui-min1,2,3, LIU Guo-dong1,2,3, JIA Shu-hai4, SONG Yun-hong1,2,3, LIANG Shuai1,2,3
1. Shenyang Center of China Geological Survey, Shenyang 110034, China; 2. Key Laboratory of Black Soil Evolution and Ecological Effects, Ministry of Natural Resources, Shenyang 110034, China; 3. Key Laboratory of Black Soil Evolution and Ecological Effects of Liaoning Province, Shenyang 110034, China; 4. Shenyang Agricultural University, Shenyang 110866, China
Abstract：The thickness of black soil layer is an important parameter to evaluate the soil quality in Northeast China. To find out its spatial distribution and secular variation, the paper conducts field investigation on the present condition of 61 typical soil profiles from the Second National Soil Survey in the black soil region of Northeast China and analyzes the variation of black soil layer thickness. The results show that the thickness of black soil layer has decreased by 12 cm on average, with the mean thinning rate of 0.32 cm/a in the past 40 years. The thinning thickness of black soil layer in four provinces/regions are significantly different, with the largest thickness and proportion of black soil layer thinning and the most severe ecological risk in Jilin(23.65 cm), followed by Liaoning(11.83 cm), Inner Mongolia(10.33 cm) and Heilongjiang(6.83 cm). There is a remarkable negative correlation between the black soil layer thickness variation and rising temperature in Jilin Province, indicating that with the climate warming, soil organic matter decreases obviously, and also the thickness of black soil layer. In addition, water erosion is also an important factor affecting the thickness thinning of black soil layer. It is suggested the study on black soil thickness determination and spatial mapping be strengthened in the future, which is of great significance to guide the protection and utilization of black land.
刘凯, 魏明辉, 戴慧敏, 刘国栋, 贾树海, 宋运红, 梁帅. 东北黑土区黑土层厚度的时空变化[J]. 地质与资源, 2022, 31(3): 434-442,394.
LIU Kai, WEI Ming-hui, DAI Hui-min, LIU Guo-dong, JIA Shu-hai, SONG Yun-hong, LIANG Shuai. SPATIOTEMPORAL VARIATION OF BLACK SOIL LAYER THICKNESS IN BLACK SOIL REGION OF NORTHEAST CHINA. GEOLOGY AND RESOURCES, 2022, 31(3): 434-442,394.
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