施肥对土壤不同碳形态及碳库管理指数的影响

分析了施肥对土壤活性碳（ＣＡ）、微生物生物量碳（ＣＭＢ）、矿化碳（ＣＭ）及碳库管理指数（ＣＰＭＩ）的影响。结果表明，不同土壤ＣＡ、ＣＭＢ、ＣＭ及ＣＰＭＩ的大小为：水稻土〉黄棕壤〉红壤〉潮土。施肥对ＣＡ和ＣＰＭＩ，ＣＭＢ和ＣＭ的影响分别为：处理３〉处理〉处理１〉处理４〉ＣＫ，处理３〉处理５〉处理４〉处理１〉ＣＫ。在提高ＣＡ、ＣＭＢ、ＣＭ及ＣＰＭＩ方面，稻草肥、绿肥优于厩肥，厩肥高量施用优于常量施用。

EFFECTS OF FERTILIZATION ON DIFFERENT CARBON FRACTIONS AND CARBON POOL MANAGEMENT INDEX IN SOILS

Effect of fertilization on active C (CA), microbial biomass C (CMB), mineralizable C (CM) and C pool management index (CPMI) in different soils were examined. Results indicated that among those studied soils, soil CA, CMB, CM and CPMI were the highest in paddy soil, the second in yellow brown soil, the third in red soil and the lowest in Cao soil. Effects of different treatments on CA, CPMI, CMB and CM were organic manure＞organic manure + NPK＞reference＞NPK＞CK, organic manure＞organic manure + NPK＞NPK＞reference＞CK respectively. In raising CA, CMB, CM and CPMI, effects of different organic fertilizer types and application were rice straw, green manure better than farmyard manure, high application better than conventional application. Compared 5-y fertilization with 10-y fertilization, CPMI in Cao soil under organic fertilizer and organic fertilizer + NPK treatments increased, while CPMI decreased under NPK and CK treatment. Correlation analysis showed: CPMI was well related to total C, total N, microbial biomass C and N, available N, P and K in these soils and sensitive to agricultural measures, which indicated that it is practical to assess soil C pools under different management practices using CPMI.