Abstract:
Objective To explore the responses of soil active organic carbon pool and CPMI to different control measures in rocky desertification area and provide the scientific basis for rational land use and rocky desertification ecological management in karst area.
Method Three typical measures for controlling rocky desertification in karst including Nested ladder(NL), Fish scale pit(FSP), and terrace(TR) were compared with CK (natural slope soils) . The response of soil active carbon and carbon pool management index under different control measures was studied.
Result The soil active organic carbon content and storage under different rocky desertification control measures showed a trend of the highest FSP, followed by the NL, and the lowest TR. The contents of EOC, DOC and pool storage showed that FSP were significantly higher than the other measures. The CPMI in FSP were all higher than NL and TR. The CPMI showed that the fish scale pit measure was greater than the other two rocky desertification control measures. The control measures improved the quality of the topsoil in the karst area.
Conclusion This study suggests that different rocky desertification control can significantly affect the active organic carbon in karst. FSP is more beneficial to the active SOC fraction accumulation and the quality of carbon pool than other measures. FSP can be used as a priority measure for the ecological restoration of karst rocky desertification.
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