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Temperature and moisture responses to carbon mineralization in the biochar-amended saline soil

文献类型： 外文期刊

作者： Sun, Junna 1 ; He, Fuhong 2 ; Zhang, Zhenhua 2 ; Shao, Hongbo 3 ; Xu, Gang 4 ;

作者机构： 1.Ludong Univ, Sch Life Sci, Yantai 264025, Peoples R China

2.Ludong Univ, Inst Geog & Planning, Yantai 264025, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Agrobiotechnol, Nanjing 210014, Jiangsu, Peoples R China

4.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China

关键词： Carbon mineralization;Biochar;Temperature;Soil moisture;Saline soil

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN：

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收录情况： SCI

摘要： This study assessed the effects of temperature and moisture on carbon mineralization (C-min) in a saline soil system with biochar amendment. The dynamics of Cmin were monitored in a biochar-amended saline soil for 220 days by incubation experiments under different conditions of temperature (15 degrees C, 25 degrees C and 35 degrees C) and moisture (30%, 70% and 105% of the water-holding capacity). Results showed that as the incubation temperature rose, cumulative Cmin consistently increased in soil added with 0-4% biochar. The two-compartment model could well describe the dynamics of Cmin. The temperature rise increased the concentration of labile C in soil, but reduced the turnover time of labile and recalcitrant C pools and the value of temperature coefficient Q(10). The response of Cmin to moisture was varying in soil amended with different levels of biochar. In the control treatment (soil alone), cumulative Cmin increased only when soil moisture was >105%. In the biochar treatments, however, 70% of water holding capacity was optimal for Cmin, except for 2%-biochar treatment at 35 degrees C. The findings highlight the necessity to consider the combined effects of soil moisture, temperature and the amount of biochar added for assessing Cmin in biochar-amended saline soils. (C) 2016 Elsevier B.V. All rights reserved.

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