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首页> 外文期刊>Applied Soil Ecology >Enhanced labile carbon flow in soil-microbes-plant-atmospheric continuum in rice under elevated CO2 and temperature leads to positive climate change feed-back
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Enhanced labile carbon flow in soil-microbes-plant-atmospheric continuum in rice under elevated CO2 and temperature leads to positive climate change feed-back

机译：在升高的二氧化碳和温度下，水稻中土壤微生物 - 植物大气连续体的增强的不稳定碳流导致倒反馈积极的气候变化

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Lowland rice along with wetland sequesters one third of terrestrial carbon (C) which is responsible for both positive and negative feed-back to climate change. Labile C pools are sensitive to anticipated climate change condition (elevated CO2 and temperature). Those may eventually affect the C-stock in soil-microbes-plant-atmospheric (SMPA) continuum through priming effect and could enhance positive climate change feedback. Therefore, the objectives of the study were to analysis the effect elevated CO2 on C partitioning in rice-plant parts, soil labile C pools, and methane emission; along with identify related bacterial diversities and C-fixation pathways through whole genome metagenomic approach. The labile carbon flow in SMPA continuum was estimated for 3 years in lowland rice under elevated CO2 and temperature in open top chambers (OTCs). Rice was grown under ambient CO2 (a-CO2; 390 +/- 20 mu mol mol(-1)) and elevated CO2 and temperature (e-CO2T; 550 +/- 20 mu mol mol(-1); 2 degrees C above ambient) under OTCs with replications. Soil labile C pools were increased by 25.4 to 38.9%, under e-CO2T over a-CO2. In microbes, biomass C, C-fixation pathways (metagenomic analysis) and C related soil enzymes were assayed. In atmosphere, the methane emission was measured and in plant system, C in different plant-parts, photosynthetic rates, root exudates-C were estimated to quantify labile C flow. Root exudates C was increased by 31.9% and microbial biomass C was enhanced by 23.3% under e-CO2T. Primarily, 12 soil bacterial genera which were responsible for C-fixation were dominant with higher abundance reads under e-CO2T. In C-fixation, dicarboxylate hydroxybutyrate cycle pathway and reductive citric acid cycle pathway were predominant under a-CO2 and e-CO2T, respectively. The methane emission was 26.0 and 26.8% higher under e-CO2T than a-CO2 at vegetative and reproductive stage of crop, respectively. Further, we got higher biomass accumulation, photosynthetic rate and stomatal conductance of rice under e-CO2T. Therefore, these augmented labile C flows in SMPA continuum may trigger the priming of soil C stocks, and at the same time could affect the system as a whole and results a positive feedback to climate change.
机译：低地米饭以及湿地螯合三分之一的陆地碳（c），负责正面和负面反馈到气候变化。不稳定的C池对预期的气候变化条件（二氧化碳和温度高）敏感。这些可能最终通过引发效果来影响土壤微生物 - 植物大气（SMPA）连续核的C-储备，并可提高积极的气候变化反馈。因此，该研究的目标是分析水稻植物零件，土壤不稳定C池和甲烷排放中C分区的升高二氧化碳;除了通过全基因组聚物方法鉴定相关的细菌多样性和C型固定途径。 SMPA连续体中的不稳定碳流量在升高的CO2和敞开的顶部腔室（OTC）下的温度下估计3年。在环境CO 2（A-CO 2; 390 +/-20μmol（-1））和升高的CO 2和温度（E-CO2T; 550 +/-20μmol（-1）; 2℃; 2℃高于环境温度）在OTC下进行复制。在A-CO 2上，土壤不稳定C池在E-CO2T下增加25.4至38.9％。在微生物中，测定生物量C，C-固定途径（MATAGENOMIC分析）和C相关土壤酶。在大气中，甲烷排放是测量的，在植物系统中，在不同的植物零件，光合速率，根出渗出物-c估计量化稳定性C流量。将根出渗出物C增加31.9％，并且在E-CO 2T下提高了23.3％的微生物生物量C.主要是12种土壤细菌属，该原菌属于C-固定的土壤细菌属，在E-CO2T下较高的读数占主导地位。在C-固定中，分别在A-CO 2和E-CO 2T下取代二羧酸甲酯羟基丁酸酯循环途径和还原柠檬酸循环途径。在作物营养和生殖阶段，甲烷排放比E-CO2T在E-CO2T下的26.0％和26.8％。此外，在E-CO2T下，我们得到了更高的生物量积累，光合速率和水稻的气孔导率。因此，SMPA连续体中的这些增强的不稳定C流动可能会引发土壤C股的启动，同时可以影响整个系统，并导致气候变化的积极反馈。

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