摘要
为稳定农田土壤碳库,减少土壤碳元素流失,在西北农林科技大学校内试验基地开展为期2a的田间定位试验,研究麦豆轮作及秸秆覆盖量对土壤碳平衡影响。以麦闲轮作秸秆不还田(S0)、秸秆全量还田(S1)、秸秆半量还田(S1/2)为对照,设置麦豆轮作S0、S1、S1/2等处理,采用GXH-3010E1型便携式红外线分析仪及重铬酸钾加热法分别测定土壤碳排放通量和土壤有机碳质量分数。结果表明,2a试验期间,单位空间土壤(1m3)有机碳储量均发生变化,麦闲轮作土壤有机碳储量提升0.92×105 kg·m-3,麦豆轮作提升2.11×105 kg·m-3。其中,麦闲轮作S1/2处理增加1.64×105 kg·m-3,S1处理增加3.63×105 kg·m-3;麦豆轮作S1/2处理增加0.45×105 kg·m-3,S1处理保持稳定。观测期内麦闲地土壤碳排放通量最高值为9 000kg·m-2·h-1,麦豆地最高值为6 000kg·m-2·h-1;与麦闲区相比,麦豆轮作区碳排放总量降低了1.36×103 kg·m-2,S1/2处理碳排放总量最低。在黄土旱区实行少耕麦豆轮作半量秸秆还田有助于稳定土壤碳库减少土壤碳排放。
In order to steady soil carbon pool and reduce soil carbon loss,two years field test was conducted at northwest AF University to explore the effects of summer-soybean/winter-wheat rotation and different straw management on soil carbon balance.The test set no straw（S0）,half quantity straw return（S1/2）,total straw return（S1）under summer-soybean/winter-wheat rotation treatment,with regarding summer-fallow/winter-wheat rotations as control treatment,by using GXH-3010E1 portable infrared analyzer and potassium dichromate heating method to determine soil carbon emission flux and soil organic carbon content.The results showed that：after two years,the unit space（1m^3）soil organic carbon storage both changed,wheat-fallow rotation increased 0.92×10^5 kg·m^-3 andwheat-soybean rotation increased 2.11×10^5 kg·m^-3.S1/2and S1 treatment of wheat-fallow rotation increased 1.64×10^5 kg·m^-3,3.63×10^5 kg·m^-3,respectively,compared with 0.45×10^5 kg·m^-3,0kg·m^-3 of wheat-soybean rotation.The highest carbon emission flux of summer-fallow/winterwheat mode was 9 000kg·m^-2·h^-1,while 6 000kg·m^-2·h^-1 in Summer-soybean/winter-wheat mode.Compared with summer-fallow/winter-wheat mode,total carbon emission of summer-soybean/winter-wheat mode decreased by 1.36×10^3 kg·m^-2,and reached the lowest in S1/2treatment.In semi-arid loess area,half quantity straw returning in summer-soybean/winter-wheat rotation could be helpful for stabilizing soil carbon pool and cutting carbon emission.
出处
《西北农业学报》
CAS
CSCD
北大核心
2014年第11期212-218,共7页
Acta Agriculturae Boreali-occidentalis Sinica
基金
"十二五"公益性(农业)行业专项(201103001)
