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| Distribution characteristics of soil total organic carbon in typical Karst area and its response to different planting and management modes of slope farmland |
| HUANG Kai1,2, LI Rui1,2, YANG Pingping1,2, PAN Lidong1,2, ZHANG Linqing1,2 |
1. Guizhou Normal University, School of Karst Science, 550001, Guiyang, China;
2. State Engineering Technology Institute for Karst Desertification Control, 550001, Guiyang, China |
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Abstract [Background] Karst landforms are concentrated in the southwest of China. Under the influence of both natural and human factors, rocky desertification is serious in this area. The total organic carbon (TOC) content is an important index to reflect the soil quality. Compared with traditional planting mode, compound planting mode may reduce soil erosion and improve TOC. The purpose of this paper is to explore the distribution characteristics of TOC in typical Karst rocky desertification areas and the change patterns of TOC under different planting and management modes.[Methods] Qianxi Jinlan demonstration area and Guanling-Zhenfeng Huajiang demonstration area were taken as study areas. The two study areas are of strong typicality in rocky desertification degree and slope farmland planting modes. Based on the field sampling and laboratory analysis, the intrinsic mechanism of TOC changing with the degree of rocky desertification and the response mechanism to different planting and management modes were discussed.[Results] 1) The average TOC of Qianxi Jinlan demonstration area was 29.06 g/kg. The average TOC of Guanling-Zhenfeng Huajiang demonstration area was 33.02 g/kg. There was no significant difference in TOC content between the two study areas. 2) The TOC of intensive rocky desertification was the highest, which was 38.96 g/kg. There was a significant difference in TOC content between moderate rocky desertification and intensive rocky desertification (P<0.05). 3) The TOC content in different planting modes showed the following pattern:silvopasture (34.38 g/kg) > agroforestry (33.35 g/kg) > economic fruit forest (32.23 g/kg) > cultivated pastures (30.91 g/kg) > monoculture of other crops (27.20 g/kg) > maize (17.67 g/kg). 4) There was a significant difference in TOC content among 3 field management modes (refined management, general management, and extensive management) in slope farmland. With the increase in the delicacy of field management mode, TOC content showed a trend of increasing gradually.[Conclusions] Compared with non-karst areas, the TOC content of topsoil in Karst area is not low. With the aggravation of rocky desertification, the TOC of soil will not always decrease. Planting and management modes have a great impact on TOC. In general, compound planting, grass planting, afforestation, and refined management may significantly improve the content of TOC in slope farmland. The results of this paper may provide a theoretical basis for the adjustment of the planting structure in the Karst slope farmland, and the comprehensive control of regional soil erosion and rocky desertification.
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Received: 10 January 2020
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