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秸秆还田配施腐秆剂下不同氮肥运筹对土壤养分 及活性有机碳库的影响
何治逢,王时聪,尹众,王鑫,柴如山,邬刚,刘荣,师焕芝,马超
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(农田生态保育与污染防控安徽省重点实验室,安徽农业大学资源与环境学院,合肥 230036;安徽省农业科学院土壤肥料研究所,合肥 230031;安徽六国化工股份有限公司,铜陵 244021;合肥市农业经济技术服务管理总站,合肥 230091)
摘要:
为探明秸秆促腐还田条件下沿淮地区不同氮肥运筹对土壤养分及活性有机碳库的影响,为秸秆还田后氮肥的合理施用提供依据,通过沿淮麦田的定位试验,设置4个处理,分别为稻秸还田+腐秆剂(CN52,C/N=52∶1)、稻秸还田+腐秆剂+增基减拔施N肥(CN11,C/N=11∶1)、稻秸还田+腐秆剂+常规施肥(CN17,C/N=17∶1)和稻秸还田+腐秆剂+减基增拔施N肥(CN22,C/N=22∶1),并对耕层土壤养分、不同形态碳素、不同形态碳素有效率和碳库管理指数等进行分析。结果发现:土壤碱解氮以CN17最高,为166.23 mg·kg-1,而土壤速效磷和速效钾以CN11最高,分别为22.12和138.75 mg·kg-1;土壤总有机碳、活性有机碳、可溶性有机碳、活性有机碳有效率和可溶性有机碳有效率均以CN11最高,分别为15.52 g·kg-1、11.87 g·kg-1、38.04 μg·kg-1、76.49% 和0.25%;土壤碳库管理指数也以CN11最高,为204.19;土壤养分含量、碳素有效率与土壤碳库指数的相关性最高。总之,沿淮地区稻秸促腐还田施用氮肥调节土壤初始C/N至11时,土壤养分含量、有机碳中活性组分含量及其有效率和土壤碳库管理指数的提升效果最大。
关键词:  秸秆还田  腐秆剂  氮肥运筹  土壤养分  活性有机碳  沿淮地区
DOI:10.13610/j.cnki.1672-352x.20220705.005
基金项目:安徽省自然科学基金(1808085MD97), 国家自然科学基金(32071628, 41877099), 安徽省重大科技专项(18030701188), 安徽省农业科学院学科建设项目(2021YL086)和安徽农业大学大学生创新创业项目(XJDCXJDC2020468, XJDC2020492)共同资助。
Effects of different nitrogen application methods on soil nutrients and labile organic carbon pool under the condition of straw returning with straw-decomposing microbial inoculant
HE Zhifeng,WANG Shicong,YIN Zhong,WANG Xin,CHAI Rushan,WU Gang,LIU Rong,SHI Huanzhi,MA Chao
(Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036;Institute of Soil and Fertilizer, Anhui Academy of Agricultural Sciences, Hefei 230031;Anhui Liuguo Chemical Co., Ltd., Tongling 244021;Hefei Agricultural Economic and Technological Service Management Station, Hefei 230091)
Abstract:
In order to provide a basis for rational application of nitrogen fertilizer after straw returning, a field experiment was carried out in area along Huaihe River to explore the effects of different nitrogen application methods on soil nutrients and labile organic carbon pool under the condition of straw returning with straw-decomposing microbial inoculant. Four treatments: rice straw returning + straw-decomposing microbial inoculant (CN52, C/N = 52:1), rice straw returning + straw-decomposing microbial inoculant + fertilized more N base fertilizer (CN11, C/N = 11:1), rice straw returning + straw-decomposing microbial inoculant + recommended N fertilizer (CN17, C/N = 17:1) and rice straw returning + straw-decomposing microbial inoculant + fertilized less N base fertilizer (CN22, C/N = 22:1) were set to analyze soil nutrients, different forms of carbon, different forms of carbon efficiency and carbon pool management index. The results showed that: CN17 treatment had the highest soil available N, which was 166.23 mg·kg-1, CN11 treatment had the highest soil available P and K, which were 22.12 and 138.75 mg·kg-1, respectively;
Key words:  straw returning  straw-decomposing microbial inoculant  nitrogen fertilizer application approach  soil nutrients  labile organic carbon  area along Huaihe River

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