NEIGAE OpenIR
Wetland saturation with introduced Fe(III) reduces total carbon emissions and promotes the sequestration of DOC
Y. C. Zou, S. J. Zhang, L. L. Huo, G. Z. Sun, X. G. Lu, M. Jiang and X. F. Yu
2018
发表期刊Geoderma
卷号325页码:141-151
摘要Solutions containing dissolved organic carbon (DOC) from a depressional wetland that receives agricultural drainage water were incubated in pure quartz sands with FeCl3 added as the main electron acceptor. The effects of three factors (the water, DOC, and Fe contents) on the CO2 and CH4 production rates, integrated cumulative C emissions and Fe-OC co-precipitation were studied. The results showed that CO2 production during the DOC mineralization process was facilitated by Fe(III) reduction at the expense of CH4 production. Additionally, the cumulative CO2 emissions determined by integrating the temporal curves of CO2 production were negatively correlated with those of CH4 (r = -0.48, p < 0.01). Extremely large ratios of the CO2:CH4 production rate (13,762 and 44,885 under two soil water conditions: saturation and flood conditions of twice the saturation level) were observed. These ratios were likely caused by simultaneous anaerobic fermentation, microbial respiration, and methanogenesis suppression triggered by iron reduction. The effects of exogenous Fe(III) inputs on total C emissions (as the sum of integrated cumulative CO2 and CH4) were only dependent on soil water conditions during the initial period of the experiment, and flooded conditions increased total C emissions by as much as double. Increased ratios of Fe inputs to C contents were found to proportionally increase the total C emissions (R-2 = 0.32, p < 0.01). Under saturated conditions, the co-precipitation of Fe-OC complexes prevented the remainder of the DOC from undergoing mineralization. In terms of DOC, we concluded that wetland saturation with introduced Fe(III) can reduce total C emissions from anaerobic respiration and promote C sequestration. Northeast China contains a large concentration of wetlands, primarily in two prominent types, freshwater marshes on the lowlands plains to the northeast and mountain permafrost peatlands in the north. Both wetlands types are threatened by disturbance, the marshes from agricultural conversion and the peatlands due to climate warming and loss of permafrost. Here we compare two seasons of ecosystem-scale CH4 fluxes measured via eddy covariance for a permafrost peatland in the Da Xing'anling Mountains and a freshwater marsh on the Sanjiang Plain. The objectives were to quantify CH4 fluxes, compare seasonal trends in the flux and determine the dominant environmental and biophysical drivers of the CH4 flux for these two distinct wetland types. CH4 fluxes at the marsh had a strong seasonal trend peaking in mid-summer, while the pattern for the peatland was muted. Maximum instantaneous fluxes were 1.34 mu g CH4 m(-2) s(-3). and 9.5 mu g CH4 m(-2) s(-3) at the peatland and marsh, respectively. Total seasonal CH4 emissions for the peatland, 0.38.4.27 g C-CH4 m(-2), were an order of magnitude smaller than those at the marsh, 19.71-21.8 g C-CH4 m(-2). Differences between years were small for both wetlands. We used path analysis to examine environmental and biophysical drivers of the flux and found that soil temperature (average soil temperature between 10 cm to 60 cm depths for the peatland and 10 cm depth for the marsh) was most strongly correlated with seasonal CH4 variability for both wetlands. Secondary influences were thaw depth for the peatland and net ecosystem CO2 exchange for the marsh.
文献类型期刊论文
条目标识符http://ir.iga.ac.cn/handle/131322/9285
专题中国科学院东北地理与农业生态研究所
作者单位中国科学院东北地理与农业生态研究所
推荐引用方式
GB/T 7714
Y. C. Zou, S. J. Zhang, L. L. Huo, G. Z. Sun, X. G. Lu, M. Jiang and X. F. Yu. Wetland saturation with introduced Fe(III) reduces total carbon emissions and promotes the sequestration of DOC[J]. Geoderma,2018,325:141-151.
APA Y. C. Zou, S. J. Zhang, L. L. Huo, G. Z. Sun, X. G. Lu, M. Jiang and X. F. Yu.(2018).Wetland saturation with introduced Fe(III) reduces total carbon emissions and promotes the sequestration of DOC.Geoderma,325,141-151.
MLA Y. C. Zou, S. J. Zhang, L. L. Huo, G. Z. Sun, X. G. Lu, M. Jiang and X. F. Yu."Wetland saturation with introduced Fe(III) reduces total carbon emissions and promotes the sequestration of DOC".Geoderma 325(2018):141-151.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Y. C. Zou, S. J. Zhang, L. L. Huo, G. Z. Sun, X. G. Lu, M. Jiang and X. F. Yu]的文章
百度学术
百度学术中相似的文章
[Y. C. Zou, S. J. Zhang, L. L. Huo, G. Z. Sun, X. G. Lu, M. Jiang and X. F. Yu]的文章
必应学术
必应学术中相似的文章
[Y. C. Zou, S. J. Zhang, L. L. Huo, G. Z. Sun, X. G. Lu, M. Jiang and X. F. Yu]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。