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主要分析了长期施用有机肥对瘠薄红壤有效碳库(微生物量碳,易氧化碳,矿化碳)及碳库管理指数(CPMI)的影响.结果表明:长期施用有机肥对土壤有效碳库和碳素有效率有很大影响,绿肥,稻草秸秆肥和厩肥处理的土壤有机碳,微生物量碳、易氧化碳、矿化碳的数量、碳素有效率明显高于对照处理的土壤。施肥对全碳、矿化碳的影响为:厩肥>绿肥>秸秆稻草肥>本田还田>对照,对微生物量碳的影响为:绿肥>厩肥>稻草秸秆肥>本田还田>对照,对活性碳(CA)、CPMI,碳素有效率A、B、C的影响为:绿肥>稻草秸秆肥>厩肥>本田还田>对照。在提高CA、CPMI方面,绿肥和稻草秸秆肥优于厩肥。相关分析表明:土壤有效碳库和碳素有效率与土壤化学性质相关或极相关,CPMI与土壤养分因子相关或极相关,反映了农业生产措施对土壤碳库的影响,可以运用CPMI来评估土壤碳库的变化。
The effects of long-term application of organic manure on available carbon stocks (microbial biomass carbon, readily oxidizable carbon, mineralized carbon) and carbon stock management index (CPMI) of under-fertilized red soils were analyzed.The results showed that long-term application of organic fertilizers on soil available carbon stocks Carbon efficiency had a significant impact. The contents of soil organic carbon, microbial biomass carbon, readily oxidizable carbon, mineralized carbon and carbon were significantly higher in green manure, straw, straw and manure than those in the control soil. The effects of fertilization on total carbon and mineralized carbon were as follows: manure> green manure> straw and straw fertilizer> Honda-returning> control, and the effect on microbial biomass carbon was green manure> manure> straw and straw fertilizer> The effects of carbon (CA), CPMI and carbon efficiency A, B and C were as follows: green manure> straw and straw fertilizer> manure> Honda straw> control. In improving CA, CPMI, green manure and straw straw fertilizer is better than manure. Correlation analysis showed that soil available carbon pool and carbon efficiency were related to or highly correlated with soil chemistry, and CPMI correlated with or significantly correlated with soil nutrient factors, reflecting the impact of agricultural practices on soil carbon stocks. CPMI could be used to assess soil Changes in carbon stocks.