%0 Journal Article %T 保护性耕作农田固碳减排效应分析——以陕西户县、大荔和临渭区为例<br>Analysis of Farmland Carbon Sequestration and Greenhouse Gas Mitigation under Conservation Tillage——Case Study of Huxian,Dali and Linwei District %A 陈 %A 庆 %A 李长江 %A 张俊丽 %A 王阳峰 %A 杨 %A 飞 %A 温晓霞 %J 西北农业学报 %D 2016 %R 10.7606/j.issn.1004-1389.2016.11.015 %X 为了分析保护性耕作的固碳减排效应，以陕西省关中平原麦玉两熟区为研究对象，选取西安户县、渭南大荔和临渭区3个具有代表性的地区进行调查研究，从土壤有机碳固定、土壤温室气体排放、物资投入造成的温室气体排放和避免秸秆焚烧造成的温室气体减排4个方面对该地区保护性耕作措施的固碳减排效应进行综合分析和估算。结果表明：与传统耕作相比，保护性耕作提高了土壤有机碳密度，每公顷农田每年碳固定量增加3 467.28 kg CO2当量，占总减排量的64.21%，对温室气体减排贡献最大；因减少物资投入和避免秸秆焚烧所产生的减排量分别为68.04 kg·hm-2·a-1和1 864.65 kg·hm-2·a-1CO2当量；因秸秆还田产生的N2O抵消了5.67%的温室气体减排量。保护性耕作措施下每公顷农田每年可减少温室气体排放4 739.76~5 364.30 kg CO2当量，整个保护性耕作项目区每年产生的减排量约为2.0×10t CO2当量。因此，保护性耕作技术在关中平原具有巨大的固碳减排能力，是一项经济且对环境友好的生产技术。<br>In order to analyze the carbon sequestration and greenhouse gas(GHGs) mitigation under conservation tillage,we took the wheat-corn cropping area in Guanzhong Plain as a case study and selected Huxian,Dali and Linwei district as three typical research areas . Soil organic carbon sequestration,GHGs fluxes,GHGs emission caused by input materials and GHGs mitigation caused by avoiding straw burning were studied to comprehensively analyze and estimate the carbon sequestration and GHGs mitigation under conservation tillage. The results indicated that the soil organic carbon density improved under conservation tillage compared with traditional tillage,and soil organic carbon sequestration increased 3 467.28 kg CO2 equivalent per hectare annually,accounting for 64.21% of the total emission reductions,which contributed most to GHGs mitigation. The emission reductions caused by reducing input materials and avoiding straw burning were 68.04 kg·hm-2·a-1 and 1 864.65 kg·hm-2·a-1 CO2 equivalent respectively. N2O emissions caused by straw returning offset about 5.67% of GHGs emission reductions. Under the conservation tillage,it could reduce GHGs emission of 4 739.76-5 364.30 kg CO2 equivalent per hectare annually and about 2.0×10 t CO2 equivalent was reduced annually for the conservation tillage.Therefore,conservation tillage can greatly sequestrate carbon and mitigate GHGs in the Guanzhong Plain and it was an economy and environment-friendly tillage type. %K 农田生态系统 保护性耕作 固碳减排 关中平原< %K br> %U http://xbnyxb.alljournals.cn/ch/reader/view_abstract.aspx?file_no=20161115&flag=1