Biochar application for the improvement ofwater-soil environments and carbon emissions under freeze-thaw conditions: An in-situ field trial
Biochar application for the improvement ofwater-soil environments and carbon emissions under freeze-thaw conditions: An in-situ field trial
复制标题
生物炭改善冻融条件下水土环境和碳排放的现场试验
DOI：
10.1016/j.scitotenv.2020.138007
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发表时间：
2020-06-25
影响因子：
9.8
通讯作者：
Cai, Yanpeng
中科院分区：
文献类型：
--
作者：
Gao, Yu;Li, Tianxiao;Cai, Yanpeng
生物炭在季节冻土区的应用研究较少。生物炭对季节性冻土区水土环境和碳排放的调控机制尚不清楚，影响了生物炭调控下养分迁移和春播制度的研究。为此，在冻融过程中，对玉米秸秆生物炭不同施用量（0、15、30、45、60 t. ha-1）下的土壤温度（Ts）、土壤含水量（Ms）和土壤呼吸速率（Rs）进行了监测。结果表明，生物炭可以降低土壤的导热系数，从而提高冻融土壤的保温效果，Ts提高了1.8-5.7 ℃。Ts和Ms对高生物质炭施用量的敏感性高于低生物质炭施用量。同时，生物炭改变了土壤团聚体的分布，Pearson相关分析表明，随着大团聚体（>0.25 mm）含量的增加，土壤持水能力增加，Ms增加3.7- 6.1%.主成分回归（PCR）分析表明，生物质炭能促进土壤碳排放，生物质炭处理土壤的Rs比对照高0.01-0.58 μ mol m（-2）s（-1）。在生物炭和冻融条件的协同作用下，Ms和Ts是促进冻融土壤碳排放的最重要因素。然而，生物炭可能会通过影响水-土壤环境而促进土壤CO2排放。综合考虑春季土壤水分、种子萌发和生长状况，确定生物炭的适宜施用量为44-51 t.ha（-1）。该研究为确定合理有效的生物炭调控措施和提高季节冻土区农田土壤生产力提供了理论支持。(c)2020爱思唯尔B. V.保留所有权利。
There are few studies about biochar application in seasonally frozen soil areas. The regulatory mechanism of biochar on the water-soil environment and carbon emissions in seasonally frozen soil areas is unclear, which affects the study of nutrient migration and spring cropping systems under the control of biochar. For this purpose, we monitored the soil temperature (Ts), soil liquid moisture content (Ms) and soil respiration (Rs) rate during the freeze-thaw period under different application amounts of corn stover biochar (0 t.ha(-1), 15 t.ha(-1), 30 t.ha(-1), 45 t.ha(-1) and 60 t.ha(-1)). The results showed that biochar can reduce the thermal conductivity of soil, thus improving the thermal insulation effect of frozen thawed soil, and Ts increased by 1.8-5.7 degrees C. The Ts and Ms were more sensitive to the high biochar application amount than to the low application amount. At the same time, biochar changed the soil aggregate distribution, and Pearson correlation analysis indicated that the soil water retention capacity increased by increasing the macroaggregate content (>0.25 mm), and the Ms increased by 3.7-6.1%. Principal component regression (PCR) analysis showed that biochar can promote soil carbon emission, and Rs of soil treated with biochar was 0.01-0.58 mu mol m(-2) s(-1) higher than that of the control. The Ms and Ts were the most important factors promoting the carbonemissions of freeze-thaw soil under the synergistic effect of biochar and freeze-thaw conditions. However, biochar may promote soil CO2 emissions by affecting the water-soil environment. Considering the soil moisture, seed germination and growth conditions in spring, the suitable biochar application amount was determined to be 44-51 t.ha(-1). This study provides theoretical support for determining reasonable and effective biochar control measures and improving the soil productivity of farmland soil in seasonally frozen soil areas. (c) 2020 Elsevier B.V. All rights reserved.