土壤碳库管理指数是表征土壤有机碳积累与质量的综合指标，可有效地反映人类活动对土壤质量的影响。本研究以未开垦的红壤荒地为对照，研究了3种土地利用方式(农地、茶园、果园)下0 ~ 40 cm土层总有机碳和活性有机碳的分布特征及土壤碳库管理指数的变化。结果表明：①不同土地利用方式下各土层土壤总有机碳、活性有机碳的大小均表现为农地>果园≈茶园>未开垦的红壤荒地，相比于未开垦的红壤荒地，其他3种土地利用方式均能显著提高土壤总有机碳、活性有机碳含量(P <0.05)。②红壤旱地开垦利用均能显著提高土壤碳库管理指数(P <0.05)，但在选取的3种不同利用方式下，土壤碳库管理指数在0 ~ 10 cm土层差异显著(P<0.05)，表现为农地>果园≈茶园；在0 ~ 20 cm土层表现为农地与茶园相当(P ﹥0.05)，与果园有显著差异(P <0.05)；在20 ~ 40 cm土层3种不同土地方式无明显差异(P >0.05)。因此，红壤荒地开垦利用能够提高土壤碳库管理指数，且农用地比果茶园效果更佳。

Soil carbon management index is a comprehensive index to characterize the accumulation and quality of soil organic carbon. In this paper, four land use types of red soil including farmland, tea garden, orchard and uncultivated land were selected, and the distribution of total organic carbon and active organic carbon as well as soil carbon pool management index(CPMI) of 0-40 cm layer were measured and calculated in order to explore the technical indexes of rational plow layer construction. The results showed that: 1) Total soil organic carbon and active organic carbon under different land use types were in the order of farmland> orchard≈tea garden> uncultivated land, compared with uncultivated land, soil organic carbon and active organic carbon were significantly increased in the other three land use types (P <0.05). 2) Reclamation and dryland utilization of red soil could significantly improve soil CPMI (P <0.05), but CPMI was significantly different (P <0.05) in 0-10 cm layer in an order of farmland> orchard ≈garden (P <0.05); in 0-20 cm layer, CPMIs of farmland and tea garden were similar (P >0.05), but both significant different with that of orchard (P <0.05); in 20-40 cm layer, no significant difference existed in the three different land uses (P >0.05). Therefore, reclamation of red soil can improve soil carbon pool management, and the effect of farmland is better than those of orchard and tea garden.

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江西省重点研发计划项目(20161BBF60105)、江西省发明专利产业化项目(20161BBM26042)和公益性行业(农业)科研专项项目(201503119-05-01)和资助。