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[1]HE Tieguang,YU Yuefeng,MENG Yancheng,et al.Profile Distribution Characteristics of Organic Carbon and Nutrients in Different Degraded Lime Soils in Karst Area, Northwest Guangxi Province[J].Research of Soil and Water Conservation,2019,26(04):13-18.

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Profile Distribution Characteristics of Organic Carbon and Nutrients in Different Degraded Lime Soils in Karst Area, Northwest Guangxi Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 04 Page number: 13-18 Column: Public date: 2019-06-11

Title:: Profile Distribution Characteristics of Organic Carbon and Nutrients in Different Degraded Lime Soils in Karst Area, Northwest Guangxi Province

Author(s):: HE Tieguang¹, YU Yuefeng¹, MENG Yancheng¹, SU Tianming¹, HU Junming¹, DU Hu², WANG Jin¹, LI Zhongyi¹, ZHANG Ye¹, WEI Caihui¹, FAN Shi³; 1. Agricultural Resources and Environment Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China;
2. Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;
3. Landscape College, Hunan Polytechnic of Environment and Biology, Hengyang, Hunan 421005, China

Keywords:: soil organic carbon; profile distribution; lime soil; karst

CLC:: S153.6

DOI:: -

Abstract:: By means of spatial distribution instead of time series, sample plots of lime soils with five different degrees of degradation, such as no degradation, potential degradation, light degradation, moderate degradation and severe degradation, were established. Soil profile samples were collected, and the distribution characteristics of organic carbon and nutrient contents in different degraded soil profiles were analyzed. The results showed that the content of organic carbon (SOC) and organic carbon density (SOC_i) were significantly negatively correlated with soil depth (p < 0.01), i.e. SOC and SOC_i decreased with the increase of soil depth; the average organic carbon content and carbon density of lime soil under light degradation degree were the highest; the change trend of total nitrogen and available nitrogen content of lime soil under different degradation degree were similar to that of SOC, and had a very significant negative correlation with soil depth(p < 0.01); the content of total phosphorus and total potassium did not change obviously with the increase of soil depth, and the content of available phosphorus and available potassium decreased with the increase of soil depth, but no significant correlation was found between those nutrient contents and soil depth, respectively; The C:N of lime soil under different degrees of degradation was less than 15, indicating that the organic matter is readily decomposed. There was a significant correlation between SOC and nitrogen in the five degraded lime soils(p < 0.01), and the correlation with other nutrients was different.

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