Soil Carbon Pool Management Index under Different Straw Retention Regimes  

不同稻草还田方式下土壤碳库管理指数的研究(英文)

作　　者：曾研华[1] 吴建富[1] 何虎[1] 潘晓华[1] 石庆华[1] 吴自明[1] 邓伟明 

机构地区：[1]江西农业大学作物生理生态与遗传育种教育部重点实验室/江西省作物生生态与遗传育种重点实验室,江西南昌330045 [2]江西余江县农业局,江西余江335200

出　　处：《Agricultural Science & Technology》2012年第4期818-822,共5页农业科学与技术（英文版）

基　　金：Supported by the National Key Technology R&D Program during the Eleventh Five-year Plan Period,China(2006BAD02A04);the Key Technology R&D Program of Jiangxi Province,China(2009BNA03800)~~

摘　　要：[Objective] To clarify the effects of different straw retention regimes on soil fertility in double cropping paddy field. [Method] The effects of different straw reten- tion regimes on total organic carbon （CToc）, active carbon （CA） and mineralized carbon （CM） were analyzed, and carbon pool active （A）, carbon pool active index （A/）, carbon pool index （CPI） and carbon pool management index （CPMi） for each treat- ment were calculated. [Result] Compared with the unfertilized treatment （CK）, CToc, CA, CM and the available ratio of soil carbon were increased in the treatment of re- turning early season and late season rice straws to field. With the same nutrient application, CToc, CA and the available ratio of soil carbon in the field with straw re- turned to field were higher than that of straw incineration and no straw returning, and the change in soil CA content was more significant. The difference in CPMI be- tween different treatments reached significant or very significant level, and the value was in the order of straw directly returned to field 〉 straw returned to field after in- cineration 〉 no straw returned to field. [Conclusion] This study provided theoretical bases for the increase of soil CA content and soil fertility in double rice fields.[目的]明确稻草还田方式对双季稻田土壤肥力的影响。[方法]对不同稻草还田方式对土壤总有机碳(CTOC)、活性有机碳(CA)、矿化碳(CM)的影响进行分析,并计算各处理碳库活度(A)、碳库活度指数(AI)、碳库指数(CPI)和碳库管理指数(CPMI)。[结果]与不施肥对照相比,早晚稻两季稻草还田提高了土壤总有机碳、活性有机碳和矿化碳含量及其碳素有效率。等养分条件下,稻草还田处理的土壤总有机碳、活性有机碳及其碳素有效率均高于稻草烧灰还田和稻草不还田处理,且活性有机碳含量差异显著。土壤碳库管理指数处理间差异达显著或极显著,其大小趋势为稻草全量还田>稻草烧灰还田>稻草不还田。[结论]本研究为增加土壤活性有机碳含量以及增加土壤肥力提供了量化的理论依据。

关 键 词：Double-cropping paddy field Different straw retention regimes Total or- ganic carbon Active carbon Mineralized carbon Carbon pool management index 

分 类 号：S153.6[农业科学—土壤学]