Comparing combined application of biochar and nitrogen fertilizer in paddy and upland soils: Processes, enhancement strategies, and agricultural implications
文献类型： 外文期刊
作者： Yuan, Xiaomai 1 ; Gu, Xiaoyan 4 ; Liang, Run 1 ; Ban, Guichen 1 ; Ma, Li 1 ; He, Tieguang 5 ; Wang, Ziting 1 ;
作者机构： 1.Guangxi Univ, State Key Lab Conservat & Utilizat Subtrop Agribio, Nanning 530004, Guangxi, Peoples R China
2.Guangxi Univ, Coll Agron, Nanning 530004, Guangxi, Peoples R China
3.Guangxi Key Lab Sugarcane Biol, Nanning 530004, Guangxi, Peoples R China
4.Hunan Acad Agr Sci, Crop Res Inst, Changsha 410125, Hunan, Peoples R China
5.Guangxi Acad Agr Sci, Agr Resources & Environm Res Inst, Guangxi Key Lab Arable Land Conservat, Nanning 530007, Guangxi, Peoples R China
关键词： Biochar; N fertilizer; Paddy; Upland; N use efficiency
期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：8.0； 五年影响因子：8.7 ）
ISSN： 0048-9697
年卷期： 2024 年 933 卷
页码：
收录情况： SCI
摘要： Recently, biochar and N fertilizers have been used to tackle low N use efficiency (NUE) in crops across diverse environmental conditions. The coupling of biochar and N fertilizer may impact crop N utilization through different pathways in various soil types. However, there is currently a lack of comprehensive assessment of how coupling effects specifically influence N utilization in paddy and upland crops. We conducted a meta-analysis of 175 peer-reviewed studies to assess the responses of soil properties and crop traits in paddy and upland fields under coupling effects. The results indicate that NUE (+26.1 +26.1 %) and N uptake (+15.0 +15.0 %) in paddy fields increase more than in upland fields (+23.7 +23.7 % and +8.0 %, respectively), with the coupling effect providing NH4+ predominantly for rice and NO3 for upland crops. NH4+ increases in paddy fields (+6.9 +6.9 %) but decreases in upland fields (-0.7 %), while microbial biomass carbon (MBC) decreases in paddy fields (-2.9 %) and increases in upland fields (+36.0 %). These findings suggest that coupling effects supply soil inorganic nutrients in paddies and affect microbes in uplands, thereby positively affecting crop N utilization. Specifically, the greatest increase in paddy crop yield and N use efficiency occurs when the ratio of N fertilizer to biochar exceeds 1.5 %, and in uplands, it manifests when applying 10-20 t center dot ha(-1) of biochar and <150 kg center dot ha(-1) N fertilizer. In conclusion, this meta-analysis explores the differential effects of biochar and N fertilizer coupling in different arable land types, offering novel insights into the utilization strategies of biochar in agricultural fields.
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