摘要
为探究生物炭与木醋液对盐土尿素氮的硝化过程、N_(2)O排放和NH_(3)挥发的影响,以甘肃中度盐土为研究对象,设置不施尿素对照(CK)、单施尿素(N)、尿素+生物炭(N+B)、尿素+木醋液(N+WV)和尿素+生物炭+木醋液(N+B+WV)5个处理,开展室内好气培养试验。结果表明:(1)各处理在培养0~14 d的表观硝化率均呈上升趋势,其中N+B+WV处理较其他处理铵态氮含量最高、表观硝化率最低,培养后期表观硝化率明显提高;培养结束N+B+WV处理氨氧化细菌(AOB)amoA基因丰度较N处理显著提高,增幅为76.5%,氨氧化古菌(AOA)amoA基因丰度较CK显著降低,降幅为51.5%。(2)与CK相比,N处理N_(2)O和NH_(3)累积排放量显著增加;与N处理相比,N+WV、N+B和N+B+WV处理N_(2)O累积排放量分别增加10.0%、减少9.5%和减少18.2%,氧化亚氮还原酶nosZ基因丰度分别降低9.3%、26.1%和37.7%,NH_(3)累积挥发量分别减少30.5%、28.9%和49.0%。(3)综合计算各处理N_(2)O和NH_(3)排放的温室效应潜能发现,与N处理相比,N+B+WV处理降低温室效应潜能20.0%,减排效果最显著。综上,在中度盐土区采用生物炭与木醋液配施可以有效减少盐土中N_(2)O和NH_(3)排放,有利于减少土壤氮素损失并降低温室效应潜能。
To explore the effects of biochar and wood vinegar on the nitrification process of urea nitrogen,N_(2)O emission and NH_(3)volatilization of saline soil,five treatments of control(CK)with no urea,urea(N),urea+biochar(N+B),urea+wood vinegar(N+WV)and urea+biochar+wood vinegar(N+B+WV)were set up to carry out indoor aerobic culture experiments.The results showed that:(1)The apparent nitrification rate of each treatment showed an upward trend 14 days before culture.Compared with other treatments,the content of ammonium nitrogen in N+B+WV treatment was the highest,the apparent nitrification rate was the lowest,and the apparent nitrification rate was significantly higher in the later stage of culture.At the end of culture,the amoA gene abundance of ammonia oxidizing bacteria(AOB)in N+B+WV treatment was significantly higher than that in N treatment,with an increase of 76.5%,and the amoA gene abundance of ammonia oxidizing archaea(AOA)was significantly lower than that in CK,with a decrease of 51.5%.(2)Compared with CK,the cumulative emissions of N_(2)O and NH_(3)in N treatment increased significantly.Compared with N treatment,the cumulative emission of N_(2)O in N+WV,N+B and N+B+WV treatment increased by 10.0%,decreased by 9.5%and 18.2%respectively,the abundance of nitrous oxide reductase nosZ gene decreased by 9.3%,26.1%and 37.7%respectively,and the cumulative volatilization of NH_(3)decreased by 30.5%,28.9%and 49.0%respectively.(3)Comprehensive calculating the greenhouse effect potential caused by N_(2)O and NH_(3)emissions of each treatment found the N+B+WV treatment reduced the greenhouse effect potential by 20.0%,and the emission reduction effect was the most significant when compared with N treatment.In conclusion,the combined application of biochar and wood vinegar in moderately saline soil area effectively reduced N_(2)O and NH_(3)emissions in soil,soil inorganic nitrogen loss and greenhouse effect potential.
作者
于贝贝
何莉莉
刘玉学
秦晶晶
王坤
于丹丹
刘淑英
杨生茂
YU Beibei;HE Lili;LIU Yuxue;QIN Jingjing;WANG Kun;YU Dandan;LIU Shuying;YANG Shengmao(College of Resources and Environment,Gansu Agricultural University,Lanzhou,Gansu 730070,China;Institute of Environment,Resource,Soil and Fertilizer,Zhejiang Academy of Agricultural Sciences,Hangzhou,Zhejiang 310021,China;Engineering Research Center of Biochar of Zhejiang Province,Hangzhou,Zhejiang 310021,China;Sino-American International College,Zhuhai College,Beijing Institute of technology,Zhuhai,Guangdong 519088,China;School of business,City University of Macao,Macao 999078,China;Liaoning Jinghua Engineering Consulting Co.,Ltd.,Shenyang,Liaoning 110029,China)
出处
《干旱地区农业研究》
CSCD
北大核心
2023年第2期238-247,共10页
Agricultural Research in the Arid Areas
基金
浙江省自然科学基金(LY21D010003)
国家科技部:国家重点研发计划项目(2018YFF0213404)。
关键词
生物炭
木醋液
中度盐土
气态氮损失
温室效应潜能
biochar
wood vinegar
moderately saline soil
gaseous nitrogen loss
global warming potential
