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DCD不同施用时间对水稻生长期CH4和N2O排放的影响 被引量:18
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作者 李香兰 马静 +3 位作者 徐华 曹金留 蔡祖聪 kyagi 《生态学报》 CAS CSCD 北大核心 2008年第8期3675-3681,共7页
硝化抑制剂传统的施用方法是在作物移栽或播种前与基肥配合施用。通过温室盆栽试验研究相同施肥条件下,硝化抑制剂双氢胺(dicyandiamide,DCD)不同施用时间(与基肥混施、分孽肥后施入、穗肥后施入)对水稻生长期CH4和N2O排放的影响。结果... 硝化抑制剂传统的施用方法是在作物移栽或播种前与基肥配合施用。通过温室盆栽试验研究相同施肥条件下,硝化抑制剂双氢胺(dicyandiamide,DCD)不同施用时间(与基肥混施、分孽肥后施入、穗肥后施入)对水稻生长期CH4和N2O排放的影响。结果表明,施入DCD能同时降低CH4和N2O排放量。就整个水稻生长期而言,与基肥混施DCD分别降低21.41%的CH4排放量和8.00%的N2O排放量;调节DCD施用时间至分孽肥后显著降低30.30%的N2O排放量,同时降低5.24%的CH4排放量。就施入DCD到水稻收获的特定生长阶段而言,缓施DCD分别降低32.65%的N2O排放量和11.18%的CH4排放量;晚施DCD对CH4和N2O排放的影响不大。CK、早施DCD、缓施DCD及晚施DCD处理CH4平均排放通量分别为0.95、0.75、0.87mg/(m.2h)及0.94 mg/(m.2h),N2O平均排放通量为155.67、143.24、108.50μg/(m.2h)及153.24μg/(m2.h),缓施DCD显著降低CH4和N2O排放量(p<0.01)。土壤温度是影响N2O排放的主要因素,而CH4排放通量与土壤Eh呈显著负相关(p<0.01)。 展开更多
关键词 硝化抑制剂 双氢胺(DCD) CH3和N2O 水稻土
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LONG-TERM CREEP AND RUPTURE PROPERTIES OF HEATRESISTING STEELS AND ALLOYS
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作者 k.yagi F.Abe 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1998年第6期391-396,共6页
The present status of NRIM Creep Data Sheet Project and the recent activities of long-term creep and rupture studies on heat resisting steels are described. The project has been continued to produce long-term data suc... The present status of NRIM Creep Data Sheet Project and the recent activities of long-term creep and rupture studies on heat resisting steels are described. The project has been continued to produce long-term data such as 100 000h-creep rupture strength for 47 kinds of principal heat resisting steels and alloys, including welded joints. The long-term creep deformation behavior and microstructural evolution during creep have been shown to be complicated. 展开更多
关键词 heat resisting steel and alloy creep deformation microstructural evolution
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DEVELOPMENT OF A MATERIALS RISK INFORMATION PLATFORM FOR A SAFE SOCIETY
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作者 k.yagi 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第4期375-380,共6页
A Materials Risk Information Platform is being developed under the cooperation of companies and academic societies with NIMS as project core. To combine safety and economy, which are sometimes contrary to each other, ... A Materials Risk Information Platform is being developed under the cooperation of companies and academic societies with NIMS as project core. To combine safety and economy, which are sometimes contrary to each other, it is important to find an optimal solution using a new concept: risk based engineering. A 5-year project, the Materials Risk Information Platform, was started in 2001 in NIMS on the boilers of thermal power plants and the objectives of this project, research areas and its present state were outlined. 展开更多
关键词 RISK ACCIDENT structural material aged plant life prediction equipment diagnostic system
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