METHANE EMISSIONS AND GROWTH OF SPARTINA PATENS IN RESPONSE TO SOIL REDOX INTENSITY
METHANE EMISSIONS AND GROWTH OF SPARTINA PATENS IN RESPONSE TO SOIL REDOX INTENSITY
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DOI：
10.2136/sssaj1994.03615995005800060037x
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发表时间：
1994-11-01
影响因子：
2.9
通讯作者：
DELAUNE, RD
中科院分区：
文献类型：
--
作者：
KLUDZE, HK;DELAUNE, RD
通过室内试验，研究了土壤氧化还原强度（Eh）对米草（Spartina patens（艾顿）Muhlenb.）生长、根系孔隙度（POR）、O-2径向损失以及CH 4产生、氧化和排放的影响。(salt草地灯心草）。植物在密西西比冲积土（粉质粘壤土，Typic Fluvaquent）中生长50天，控制pH值为200、-200和-300 mV。植物生长随Eh强度的增加而下降。在200和-300 mV的土壤氧化还原强度处理之间，根干重下降了37%，地上部干重下降了25%。根气隙的形成增强了pH值下降到约30天时，进一步发展似乎停止和平稳在所有的氧化还原处理。甲烷产量普遍增加的强度减少。植物介导的排放量与生产水平相当，但受植物相关因素的影响，特别是森林。在光照和黑暗条件下，气孔对甲烷排放的影响不显著（P < 0.05），说明气孔对甲烷排放的影响不大。patens。植物介导的CH 4氧化在-200 mV时比在-300 mV时高16%。本研究的结果表明，土壤氧化还原强度如何启动生理变化的S。patens，这反过来又调节植物中的气体输送。虽然实验条件不能代表自然环境，但研究结果为土壤氧化还原强度对S. patens。
Laboratory experiments were conducted to determine the influence of soil redox intensity (Eh) on the growth, root porosity (POR), radial O-2 loss, and CH4 production, oxidation, and emission in Spartina patens (Aiton) Muhlenb. (salt meadow cordgrass). Plants were grown for 50 d in a Mississippi alluvial soil (silty-clay loam, Typic Fluvaquent) under controlled Ph values of 200, -200, and -300 mV. Plant growth decreased with increase in Eh intensity. Root dry weights decreased by 37% and shoot dry weights by 25% between the soil redox intensity treatments of 200 and -300 mV. Root air space formation was enhanced by a decrease in Ph up to about 30 d when further development appeared to cease and levelled off in all the redox treatments. Methane production was generally enhanced by the intensity of reduction. Plant-mediated emissions were commensurate with production levels but were influenced by plant related factors, especially FOR. No differences (P < 0.05) existed between emissions in light and in the dark, which suggests a lack of stomatal influence on CH4 emissions from S. patens. Plant-mediated CH4 oxidation was higher at -200 mV than at -300 mV by a factor of 16%. Results of this study demonstrate how soil redox intensity initiates physiological changes in S. patens, which in turn modulates the gas transport in the plant. Although the experimental conditions do not represent the natural environment, the results provide a theoretical understanding of the influence of soil redox intensity on the growth, CH4 production, and gas exchange in S. patens.