为直观了解全球农田土壤增碳固碳领域的研究进展和发展趋势,文章基于Web of Science核心合集数据库和中国知网数据库,利用CiteSpace等可视化分析软件,从中英文发文量TOP10的研究机构、研究热点等方面对2000—2022年发表的农田土壤增碳...为直观了解全球农田土壤增碳固碳领域的研究进展和发展趋势,文章基于Web of Science核心合集数据库和中国知网数据库,利用CiteSpace等可视化分析软件,从中英文发文量TOP10的研究机构、研究热点等方面对2000—2022年发表的农田土壤增碳固碳相关文献进行了计量分析。结果表明,全球范围内农田土壤增碳固碳领域发文量持续增高。英文发文重点机构是中国科学院、美国农业部、法国国家农业食品与环境研究院。中文发文重点机构是西北农林科技大学、中国科学院南京土壤研究所和中国农业科学院农业资源与农业区划研究所,在该领域具有显著的科研水平和影响力。研究热点主要集中在农田碳循环及全球气候变化、土壤有机碳的稳定固持机制、农业投入品对土壤有机碳组分的影响和土壤微生物固碳功能与机制等方面。未来在深入土壤固碳与农田系统互作机理研究基础上,还应加大对新型靶向碳基材料和配套应用技术的研究。展开更多
在四川盆地2种不同母质的土壤上,通过3 a 6季作物的田间试验,研究作物秸秆还田对稻田土壤N、P、K,土壤活性碳,微生物碳,矿化碳和碳库管理指数的影响.结果表明:与对照相比,秸秆还田免耕和旋耕均可提高土壤全N,全P,全K,有效N、P、K,不同...在四川盆地2种不同母质的土壤上,通过3 a 6季作物的田间试验,研究作物秸秆还田对稻田土壤N、P、K,土壤活性碳,微生物碳,矿化碳和碳库管理指数的影响.结果表明:与对照相比,秸秆还田免耕和旋耕均可提高土壤全N,全P,全K,有效N、P、K,不同形态碳素含量和碳库管理指数.作物秸秆还田旋耕比秸秆还田免耕更能改善土壤有效碳库质量,土壤活性碳、微生物碳、矿化碳和碳库管理指数分别提高5.81%～31.76%、33.87～39.33%、15.42%～21.56%和4.03%～21.13%.相关性分析表明,运用土壤碳库管理指数表征土壤养份及碳素动态变化比土壤有机碳更具灵敏性.展开更多
[Objective] The experiment was conducted to explore the suitable planting density and nitrogen amount for summer maize in Sichuan Basin with the objective to provide technical reservation and scientific basis for high...[Objective] The experiment was conducted to explore the suitable planting density and nitrogen amount for summer maize in Sichuan Basin with the objective to provide technical reservation and scientific basis for high-yielding cultivation technique.[Method] A widely planted maize cultivar ＇Chengdan 30＇ was used as experimental material to study the effects of planting density and nitrogen amount on the stalk agronomic traits,stalk lodging-resistance mechanical characters,stalk breaking percentage and yield of maize.Experiment was arranged in a two-factor split plot design with three replicates.The planting density was the main factor with three density gradients（4.5×10^4,6.0×10^4 and 7.5×10^4 plants/hm^2） and the nitrogen amount was the second factor with two different levels of nitrogen content（300 and 375 kg/hm^2）.[Result] The stalk lodging-resistance and yield were affected by planting density significantly.The increase of planting density would result in an increase of internode length and decrease of internode diameter,dry matter weight of per unit stalk length,rind penetration strength and breaking resistance of 3rd and 4th basal internodes.When planting density increased from 6.0×10^4 plants/hm2 to 7.5×10^4 plants/hm^2,the stalk breaking percentage in the whole growing season increased by 17.17%,and the yield reduced by 17.58%.The interaction between planting density and nitrogen amount affected the stalk breaking percentage in the whole growing season and yield significantly.The treatment with planting density of 6.0×104 plants/hm^2 and nitrogen amount of 375 kg/hm^2 of pure N was an optimal combination,which may not only control the stalk breaking percentage of whole growing stage effectively,but also could obtain an optimum grain yield.[Conclusion] In Sichuan Basin,the appropriate planting density and nitrogen amount for summer maize were 6.0×10^4 plants/hm^2 and 375 kg/hm^2.展开更多
文摘为直观了解全球农田土壤增碳固碳领域的研究进展和发展趋势,文章基于Web of Science核心合集数据库和中国知网数据库,利用CiteSpace等可视化分析软件,从中英文发文量TOP10的研究机构、研究热点等方面对2000—2022年发表的农田土壤增碳固碳相关文献进行了计量分析。结果表明,全球范围内农田土壤增碳固碳领域发文量持续增高。英文发文重点机构是中国科学院、美国农业部、法国国家农业食品与环境研究院。中文发文重点机构是西北农林科技大学、中国科学院南京土壤研究所和中国农业科学院农业资源与农业区划研究所,在该领域具有显著的科研水平和影响力。研究热点主要集中在农田碳循环及全球气候变化、土壤有机碳的稳定固持机制、农业投入品对土壤有机碳组分的影响和土壤微生物固碳功能与机制等方面。未来在深入土壤固碳与农田系统互作机理研究基础上,还应加大对新型靶向碳基材料和配套应用技术的研究。
文摘在四川盆地2种不同母质的土壤上,通过3 a 6季作物的田间试验,研究作物秸秆还田对稻田土壤N、P、K,土壤活性碳,微生物碳,矿化碳和碳库管理指数的影响.结果表明:与对照相比,秸秆还田免耕和旋耕均可提高土壤全N,全P,全K,有效N、P、K,不同形态碳素含量和碳库管理指数.作物秸秆还田旋耕比秸秆还田免耕更能改善土壤有效碳库质量,土壤活性碳、微生物碳、矿化碳和碳库管理指数分别提高5.81%～31.76%、33.87～39.33%、15.42%～21.56%和4.03%～21.13%.相关性分析表明,运用土壤碳库管理指数表征土壤养份及碳素动态变化比土壤有机碳更具灵敏性.
基金Supported by the Special Fund for Agricultural and Rural Research in the Public Interest of Sichuan Province(12ZC1930)~~
文摘[Objective] The experiment was conducted to explore the suitable planting density and nitrogen amount for summer maize in Sichuan Basin with the objective to provide technical reservation and scientific basis for high-yielding cultivation technique.[Method] A widely planted maize cultivar ＇Chengdan 30＇ was used as experimental material to study the effects of planting density and nitrogen amount on the stalk agronomic traits,stalk lodging-resistance mechanical characters,stalk breaking percentage and yield of maize.Experiment was arranged in a two-factor split plot design with three replicates.The planting density was the main factor with three density gradients（4.5×10^4,6.0×10^4 and 7.5×10^4 plants/hm^2） and the nitrogen amount was the second factor with two different levels of nitrogen content（300 and 375 kg/hm^2）.[Result] The stalk lodging-resistance and yield were affected by planting density significantly.The increase of planting density would result in an increase of internode length and decrease of internode diameter,dry matter weight of per unit stalk length,rind penetration strength and breaking resistance of 3rd and 4th basal internodes.When planting density increased from 6.0×10^4 plants/hm2 to 7.5×10^4 plants/hm^2,the stalk breaking percentage in the whole growing season increased by 17.17%,and the yield reduced by 17.58%.The interaction between planting density and nitrogen amount affected the stalk breaking percentage in the whole growing season and yield significantly.The treatment with planting density of 6.0×104 plants/hm^2 and nitrogen amount of 375 kg/hm^2 of pure N was an optimal combination,which may not only control the stalk breaking percentage of whole growing stage effectively,but also could obtain an optimum grain yield.[Conclusion] In Sichuan Basin,the appropriate planting density and nitrogen amount for summer maize were 6.0×10^4 plants/hm^2 and 375 kg/hm^2.
