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首页> 外文期刊>The Science of the Total Environment >Biochar has no effect on soil respiration across Chinese agricultural soils
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Biochar has no effect on soil respiration across Chinese agricultural soils

机译：生物炭对中国农业土壤的土壤呼吸没有影响

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摘要

Biochar addition to soil has been widely accepted as an option to enhance soil carbon sequestration by introducing recalcitrant organic matter. However, it remains unclear whether biochar will negate the net carbon accumulation by increasing carbon loss through CO_2 efflux from soil (soil respiration). The objectives of this study were to address: 1) whether biochar addition increases soil respiration; and whether biochar application rate and biochar type (feedstock and pyrolyzing system) affect soil respiration. Two series of field experiments were carried out at 8 sites representing the main crop production areas in China In experiment 1, a single type of wheat straw biochar was amended at rates of 0, 20 and 40 t ha~(-1) in four rice paddies and three dry croplands. In experiment 2, four types of biochar (varying in feedstock and pyrolyzing system) were amended at rates of 0 and 20 t ha~(-1) in a rice paddy under rice-wheat rotation. Results showed that biochar addition had no effect on CO_2 efflux from soils consistently across sites, although it increased topsoil organic carbon stock by 38% on average. Meanwhile, CO_2 efflux from soils amended with 40 t of biochar did not significantly higher than soils amended with 20 t of bio-char. While the biochars used in Experiment 2 had different carbon pools and physico-chemical properties, they had no effect on soil CO_2 efflux. The soil CO_2 efflux following biochar addition could be hardly explained by the changes in soil physic-chemical properties and in soil microbial biomass. Thus, we argue that biochar will not negate the net carbon accumulation by increasing carbon loss through CO_2 efflux in agricultural soils.
机译：向土壤中添加生物碳已被广泛接受为通过引入顽固有机质来增强土壤碳固存的选择。然而，目前尚不清楚生物炭是否会通过增加土壤中CO_2的外流（土壤呼吸）而造成的碳损失来抵消碳净积累。这项研究的目的是要解决：1）添加生物炭是否增加土壤呼吸；以及生物炭的施用率和生物炭类型（原料和热解系统）是否影响土壤呼吸。在代表中国主要农作物生产区的8个地点进行了两个系列的田间试验。在试验1中，在4个水稻中以0、20和40 t ha〜（-1）的比例修改了一种小麦秸秆生物炭。稻田和三个干旱的农田。在实验2中，在稻麦轮作条件下，以0和20 t ha〜（-1）的比例对四种类型的生物炭（在原料和热解系统中有所变化）进行了修改。结果表明，尽管添加生物炭平均可使表土有机碳储量增加38％，但对各地土壤中的CO_2外溢没有影响。同时，用40吨生物炭修正的土壤中的CO_2流出量并不显着高于用20吨生物炭修正的土壤。尽管实验2中使用的生物炭具有不同的碳库和理化特性，但它们对土壤CO_2的流出没有影响。添加生物炭后土壤CO_2的排放很难用土壤理化性质和土壤微生物量的变化来解释。因此，我们认为生物炭不会通过增加农业土壤中的CO_2外流引起的碳损失来抵消净碳积累。

著录项

  • 来源
    《The Science of the Total Environment》 |2016年第1期|259-265|共7页
  • 作者

    Xiaoyu Liu; Jufeng Zheng; Dengxiao Zhang; Kun Cheng; Huimin Zhou; Afeng Zhang; Lianqing Li; Stephen Joseph; Pete Smith; David Crowley; Yakov Kuzyakov; Genxing Pan;

  • 作者单位

    Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, China,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China;

    Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, China,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China;

    Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, China,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China;

    Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, China,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China;

    Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, China;

    Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, China;

    Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, China,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China;

    Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, China,School of Materials Science and Engineering, University of New South Wales, NSW 2052, Australia;

    Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, China,Institute of Biological and Environmental Sciences, University of Aberdeen, 23 St Machar Drive, Aberdeen AB24 3UU, UK;

    Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, China,Department of Environmental Sciences, University of California Riverside, CA 92521, USA;

    Department of Soil Science of Temperate Ecosystems, University of Goettingen, Buesgenweg 2, Goettingen 37077, Germany,Department of Agricultural Soil Science, University of Goettingen, Buesgenweg 2, Goettingen 37077, Germany;

    Institute of Resource, Ecosystem and Environment of Agriculture, and Centre of Agriculture and Climate Change, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China,Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A & F University, Lin'an, Hangzhou 311300, China;

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  • 正文语种 eng
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  • 关键词

    Biochar; Soil respiration; Carbon stability; Greenhouse gas mitigation; Agricultural soils; Microbial activity;

    机译：生物炭土壤呼吸;碳稳定性;减少温室气体;农业土壤;微生物活性;

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