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首页> 外文期刊>European Journal of Soil Biology >Effects of biochar amendment on the net greenhouse gas emission and greenhouse gas intensity in a Chinese double rice cropping system
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Effects of biochar amendment on the net greenhouse gas emission and greenhouse gas intensity in a Chinese double rice cropping system

机译：生物炭改良剂对中国双季稻种植系统净温室气体排放和温室气体强度的影响

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The impacts of biochar amendment on the net greenhouse gas emission (NGHGE) and greenhouse gas intensity (GHGI) of double rice cropping systems are not well examined. In this study, a field experiment was carried out to investigate the effects of biochar amendment on NGHGE and GHGI emissions in a subtropical double rice cropping system managed with intermittent flooding during two rice-growing seasons and drainage during a fallow season from April 2012 to April 2013. Three biochar treatments were studied, with application rates of 0, 24 and 48 t ha(-1) (named CK, LC and HC, respectively). In each treatment, the fluxes of methane (CH4), nitrous oxide (N2O) and soil heterotrophic respiration (Rh) were measured using a static chamber/gas chromatography method. Key soil properties related to greenhouse gas (GHG) emissions were also determined throughout an entire double rice cycle. The results showed that biochar amendment significantly reduced annual CH4 emissions by up to 40% compared with the CK treatment, possibly due to the soil pH increase after biochar amendment other than increased soil aeration. In contrast, annual N2O emissions significantly increased by 150% and 190% in the two biochar treatments, compared with the CK treatment, which may be related to the increase of soil dissolvable organic C or NH4+ in the biochar treatments. The cumulative Rh significantly increased by 19% in the HC treatment possibly due to the additional carbon dioxide (CO2) emissions from decomposition of the labile C within biochar, but showed no increase and even a decrease in the LC treatment throughout the study period. Annually, the global warming potential for CH4 and N2O emissions, NGHGEs, and GHGIs in the biochar amendment treatments were reduced by 31-36%, 1551-2936% and 1452-2894%, respectively (p 0.05). Our collective data may suggest that as the rice grain yield was improved by the biochar amendment found in this study, the biochar application in paddy fields may be an effective measure for GHG emission mitigation in the subtropics. (C) 2014 Elsevier Masson SAS. All rights reserved.
机译：生物炭改良剂对双季稻种植系统的净温室气体排放量（NGHGE）和温室气体强度（GHGI）的影响尚未得到很好的研究。在这项研究中，进行了一项田间试验，研究了在2012年4月至4月的两个水稻种植季节间歇性洪水和休耕季节排水的亚热带双季稻种植系统中，生物炭改良剂对NGHGE和GHGI排放的影响。 2013。研究了三种生物炭处理方法，施用量分别为0、24和48 t ha（-1）（分别命名为CK，LC和HC）。在每种处理中，使用静态室/气相色谱法测量甲烷（CH4），一氧化二氮（N2O）和土壤异养呼吸（Rh）的通量。在整个双水稻周期中，还确定了与温室气体（GHG）排放有关的关键土壤特性。结果表明，与CK处理相比，生物炭改良剂显着减少了每年CH4排放量高达40％，这可能是由于生物炭改良剂后土壤pH值升高，而不是增加了土壤通气量。相反，与CK处理相比，两种生物炭处理的年N2O排放量分别显着增加了150％和190％，这可能与生物炭处理中土壤可溶性有机碳或NH4 +的增加有关。在HC处理中，累积Rh显着增加了19％，这可能是由于生物炭中不稳定C分解产生的额外二氧化碳（CO2）排放所致，但在整个研究期间，LC处理均没有增加甚至减少。每年，生物炭修正处理中的CH4和N2O排放，NGHGE和GHGI的全球变暖潜能分别减少了31-36％，1551-2936％和1452-2894％（p <0.05）。我们的集体数据可能表明，随着这项研究中发现的生物炭改良剂提高了水稻的籽粒产量，在稻田中应用生物炭可能是减轻亚热带温室气体排放的有效措施。 （C）2014 Elsevier Masson SAS。版权所有。

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