长期定位试验下施肥对潮棕壤活性碳库及碳库管理指数的影响

分析了长期不同施肥制度对潮棕壤活性碳库及碳库管理指数的影响。结果表明:长期施肥不同施肥制度对土壤活性碳库、碳素有效率及碳库管理指数有很大影响,长期施用有机循环肥处理,尤其是循环肥配合均衡化肥(NPK+O)施用处理的土壤有机碳、易氧化碳(ROC)、溶解性有机碳(DOC)、微生物量碳含量(MBC)、土壤碳素有效率及土壤碳库管理指数明显高于对照处理的土壤。潮棕壤活性碳库中不同形态的碳素含量大小顺序为:CROC>CMBC>CDOC,同一施肥处理水平下,不同形态碳素有效率以ACC>ABC>AAC。相关分析表明:土壤碳素有效率和碳库管理指数与土壤的化学性质尤其是土壤养分因子呈显著或极显著相关,反应了农业生产措施对土壤碳库的影响,运用土壤碳库管理指数可以很好地反映出土壤碳库的动态变化。

Effect of Long-term Fertilization on Available Carbon Pool and Carbon Pool Management Index in an Aquic Brown Soil

The effect of long-term different fertilization on soil available carbon pool and carbon pool management index in aquic brown soil was discussed in the paper.The results indicated that different fertilization had great effect on soil available carbon pool and available ratio of soil carbon.Treatments of recycled manure,especially the NPK with recycled manure treatment had higher contents of soil organic carbon,readily oxidizable carbon,dissolved organic carbon,microbial biomass carbon,also had higher available ratio of soil carbon and soil carbon pool management index than CK treatment.In aquic brown soil of available carbon pool the order of different type of carbon was CROC>CMBC>CDOC.In the same treatment,the order of available ratio of soil carbon was ACC>ABC>AAC.Correlation analysis showed that there were significant or extremely significant relationships between available ratio of soil carbon,soil carbon pool management index and chemical properties of soil,especially nutrient factors,the indexes were sensitive to agricultural measures,which indicated that it was practical to assess soil carbon pool under different management practices using carbon pool management index.