摘要
讨论不同农田生态系统的土壤活性碳库和碳库管理指数 ( CPMI) ,结果表明 :不同农田生态系统的土壤 CPMI明显受施肥、气候、土壤利用方式、耕种年限等因素的影响。供试土壤的活性碳含量范围为 0 .4 9～ 4 .99mg/ g,土壤 CPMI为51 .6～ 1 65。不同施肥处理对红壤 CPMI的影响顺序为绿肥 ( GM) >厩肥 ( FYM) >FYM+NPK>参考 ( REF) >NPK>对照 ( CK) ;在水稻土中 ,其相应的影响顺序为 :稻草 ( RSC) >FYM>FYM+NPK>PEF>NPK>CK。黄棕壤中 ,与 PEF的 CPMI值相比 ,GM、FYM和 FYM+NPK3个处理分别提高了 50 %、4 5.9%和 2 1 .9% ,NPK和 CK处理分别下降了6%和 38.1 %。潮土中 ,施肥 1 0 a的 CPMI值与施肥 5a的值相比较 ,FYM和 FYM+NPK处理提高了 2 8.4 %和 1 9.7% ,而 NPK和 CK处理分别下降 8.7%和 1 7.9%。相关分析表明 :CPMI与土壤全氮、全磷、碱解氮、速效磷、速效钾、p H的相关性高于 CPI、A、AI。 CPMI可灵敏地反映农业生产措施对土壤肥力。
The active C pool and CPMI (C pool management index)of soils in different agricultural ecosystems were discussed.The results indicated that CPMI was significantly affected by fertilization,climate,soil utilization patterns and cultivated age. The active C measured by KMnO 4 oxidation of soils varied from 0.49 to 4.99mg/g, CPMI from 51.6 to 165.The CPMI order of red soil in tropics influenced by different fertilization was GM(green manure)>FYM(farmyard manure)>FYM+NPK>PEF(reference)>NPK>CK.In subtropical zone,the corresponding order was RSC(rice straw compost)>FYM>FYM+NPK>REF>CK in paddy soil.In yellow brown soil,the CPMI of GM,FYM,FYM+NPK increased by 50%,45.9% and 21.9%,compared with reference,while that of NPK and CK decreased by 6% and 38.1%,respectively.In meadow soil of temperate zone, CPMI for 10 year FYM application increased by 28.4%,for FYM+NPK by 19.7%,while for NPK and CK decreased by 8.7% and 17.8%,respectively,in comparison with CPMI influenced by 5 year fertilization.It was found that CPMI was significantly correlated with total N,total P,hydrolyzable N,readily available P,K and pH.It is concluded that CPMI is a sensitive and practical index to reflect the impacts of agricultural measures on soil fertility and the dynamics of C pool variation.
出处
《生态学报》
CAS
CSCD
北大核心
2000年第4期663-668,共6页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目
关键词
碳库管理指数
施肥
土壤碳库
农田生态系统
active C
C pool management index( CPMI )
fertilization
agricultural soils
