采用空间代替时间序列的方法，选用立地条件基本相似的草本（狗尾草）阶段（Ⅰ）、灌草（紫薇-狗尾草）阶段（Ⅱ）、灌丛（牡荆+剌槐）阶段（Ⅲ）和乔灌（枫香+苦楝-牡荆）阶段（Ⅳ），通过调查取样和实验分析，对不同恢复阶段0~40 cm土层土壤生化作用强度以及它们与土壤理化因子的关系进行研究。结果表明：随着植被恢复的进行，土壤生化作用强度（包括土壤氨化作用强度、硝化作用强度、固N作用强度、纤维素分解作用强度和呼吸作用强度）显著增强（P<0.05）；土壤生化作用强度和土壤理化因子间存在密切的相关性。%The purpose of the paper was to study the dynamic changes of soil biochemical intensity and the relationship between them and soil physio-chemical properties along re-vegetation on sloping-land with purple soils in Hengyang of Hunan Province, South-central China. We took soils of 0~40 cm depth in similar and typical grass (Setaria viridi) stage (Ⅰ), frutex and grass (Lagerstroemia indica-Setaria viridi) stage(Ⅱ), frutex (Vitex negundovar. cannabifolia+Robinia pseudoacacia) stage (Ⅲ), and arbor and frutex (Liquidamdar formosana+ Melia azedarach-Vitex negundovar. cannabifolia) stage (Ⅳ), and denoted four re-vegetation stages as our test objects by using the method of the space for time. The results showed that: FromⅠ,Ⅱ,Ⅲ, toⅣ, the biochemical intensities, including ammonification, nitrification, nitrogen fixation, cellulose decomposition and respiration significantly intensified (P<0.05); There were close correlations between soil biochemical intensity and physio-chemical factors.
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