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Moisture conditions trigger different response patterns of soil respiration to biochar-induced changes in soil vertical water content and temperature based on a three-year field observation study

文献类型： 外文期刊

作者： Yang, Jiayan 1 ; Zhang, Fengbao 1 ; Li, Yuanyuan 3 ; Gao, Jingxia 1 ; Deng, Lei 1 ; Shi, Weiyu 5 ; Shen, Nan 1 ; Yang, Mingyi 1 ;

作者机构： 1.Northwest A&F Univ, Coll Water & Soil Conservat Sci & Engn, State Key Lab Soil Eros & Dryland Farming Loess Pl, Yangling 712100, Peoples R China

2.Chinese Acad Sci, Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Peoples R China

3.Zhengzhou Univ, Sch Agr Sci, Zhengzhou 450000, Peoples R China

4.Ningxia Acad Agr & Forestry Sci, Inst Hort, Yinchuan 750000, Peoples R China

5.Southwest Univ, Chongqing Engn Res Ctr Remote Sensing Big Data App, Sch Geog Sci, Chongqing 400715, Peoples R China

6.Southwest Univ, Sch Geog Sci, Chongqing Key Lab Karst Environm, Chongqing 400715, Peoples R China

关键词： Biochar amendment; Soil respiration; Vertical hydrothermal effect; Moisture intervals

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.4； 五年影响因子：6.8 ）

ISSN： 0167-8809

年卷期： 2025 年 378 卷

页码：

收录情况： SCI

摘要： Biochar impacts on soil respiration (Rs) remain uncertain, particularly in dryland regions where significant CO2 emissions result from rewetting. To examine these impacts, we conducted a three-year field experiment during the millet growing season to investigate the response patterns of Rs to biochar-induced changes in vertical soil temperature (Ts) and volumetric water content (VWC). Before Rs observation, the experimental site underwent three years of biochar amelioration (no planting) with five application rates of 1 %, 2.5 %, 4 %, 5.5 % and 7 % (BC1, BC2.5, BC4, BC5.5 and BC7, applied to the 0-20 cm soil layer). Rs was monitored within the 0-20 cm soil layer while Ts and VWC were measured simultaneously at soil depths of 5, 10 and 20 cm (Ts5, Ts10, Ts20, VWC5, VWC10 and VWC20). Moisture status within the Rs measurement range was partitioned by 0.093 m(3) m(-3) (the optimal VWC for Rs) for non-biochar amended soil (control). Overall, compared with the control, BC4, BC5.5 and BC7 significantly increased Rs (33.3-63.5 %) and experienced water stress earlier at a soil depth of 5 cm. In addition, high moisture levels caused significant differences in Rs among treatments. In terms of the relationship between Rs and Ts, the Gaussian-Ts model performed better than exponential-Ts in control only at a soil depth of 5 cm under low moisture conditions. For biochar treatments, Rs did not continue to rise with increasing Ts for BC1 and BC2.5 treatments under low moisture conditions and for BC5.5 and BC7 treatments under high moisture conditions across soil depths. With biochar application rate, Rs was dominantly shaped by VWC20 and Ts20 under low moisture conditions, while it was significantly influenced by Ts under high moisture conditions. These findings elucidate how Rs responds to biochar-induced changes in vertical Ts and VWC across moisture levels, providing valuable insights for comprehensively evaluating the environmental effects of biochar-amended soil in dryland areas.

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