不同农田生态系统土壤碳库管理指数的研究

STUDY OF CARBON POOL MANAGEMENT INDEX IN SOILS UNDER DIFFERENT AGROECOSYSTEMS

用高锰酸钾氧化法讨论了土壤活性碳库和碳库管理指数（ＣＰＭＩ）。结果表明：不同农田土壤活性碳含量为０４９～４９９ｍｇ／ｇ、ＣＰＭＩ为５１６～１６５。不同施肥处理对红壤ＣＰＭＩ的影响为绿肥（ＧＭ）＞厩肥（ＦＹＭ）＞ＦＹＭ＋ＮＰＫ＞参考（ＲＥＦ）＞ＮＰＫ＞对照（ＣＫ）；对水稻土为：稻草（ＲＳＣ）＞ＦＹＭ＞ＦＹＭ＋ＮＰＫ＞ＲＥＦ＞ＮＰＫ＞ＣＫ。黄棕壤ＧＭ、ＦＹＭ和ＦＹＭ＋ＮＰＫ处理的ＣＰＭＩ分别比ＲＥＦ提高了５０％、４５９％和２１９％，ＮＰＫ和ＣＫ下降了６％和３８１％。潮土施肥１０年的ＣＰＭＩ与施肥５年相比，ＦＹＭ和ＦＹＭ＋ＮＰＫ提高了２８４％和１９７％，而ＮＰＫ和ＣＫ下降８７％和１７９％。相关分析表明，ＣＰＭＩ与土壤全氮、全磷、碱解氮、速效磷、速效钾、ｐＨ相关或极相关。

The active C pool and CPMI(C pool management index) of soils under different agricultural ecosystem were discussed using potassium permanganate oxidation in this paper.Results indicated CPMIs were significantly affected by fertilization,climate,soil utilization style and cultivated age et al.The active C varied from 0 49 to 4 99mg/g, and CPMI from 51 6 to 165 in the experimental soils. The order of CPMI in red soil of tropical zone influenced by different fertilization treatments was GM(green manure)>FYM (farmyard manure)>FYM+NPK>REF(reference)>NPK>CK.In subtropical zone,the corresponding order was RSC(rice straw compost)>FYM>FYM + NPK>REF>CK in paddy soil,while in yellow brown soil,compared with reference,CPMI of GM,FYM,FYM+NPK incremented by 50%,45 9% and 21 9% respectively.That of NPK and CK decreased by 6% and 38 1%.In meadow soil of temperate zone,compared with CPMI influenced by 5 year fertilization,CPMI for 10 year FYM application incremented by 28 4%,for FYM+NPK by 19 7%,while for NPK and CK decreased by 8 7% and 17 8%.Correlation analysis indicated CPMI was not only related or extremely related to total N,total P,hydrolyzable N,readily available P,K and pH,but also sensitive to agricultural practices.This showed it is practical using CPMI to reflect the impacts of agricultural measures on soil fertility and the dynamics of C pool variation.