Increased contribution of root exudates to soil carbon input during grassland degradation
Increased contribution of root exudates to soil carbon input during grassland degradation
复制标题
草地退化过程中根系分泌物对土壤碳输入的贡献增加
DOI：
10.1016/j.soilbio.2020.107817
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发表时间：
2020-07
影响因子：
9.7
通讯作者：
Zhou Y
中科院分区：
文献类型：
--
作者：
Shen X;Yang F;Xiao CW;Zhou Y
The contribution of root exudates to soil carbon (C) inputs is poorly quantified, especially for grasslands under the context of degradation that includes simultaneous shifts in species composition due to long-term overgrazing. The objectives of this study were to examine (1) how grassland degradation affects root exudation rate and (2) to what extent root exudates contribute to soil C inputs compared to litter materials and root turnover during degradation. A field experiment was conducted in a temperate grassland, with different levels of degradation (undegraded control, moderately degraded, and severely degraded), dominated by different species in Inner Mongolia. Aboveground biomass, root biomass, and root exudate rate were measured monthly during a growing season. Root exudation rates differed among dominant plant species across the degradation gradients and grassland degradation significantly increased root exudation rates at the plot level. However, the amount of root exudates released to soils in degraded sites was lower than in undegraded site due to reduced living root biomass. Compared to the undegraded control, the relative contribution of root exudates to soil C inputs was enhanced by grassland degradation as a result of decreased contributions from root turnover. These findings prove grassland degradation can alter the relative contribution of root exudates compared to other soil C inputs and highlight the necessity of further studies to examine how this shift may affect soil organic C formation and long-term storage.
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影响因子：
6.5
作者：
M. Wiesmeier;M. Steffens;A. Kölbl;I. Kögel‐Knabner
通讯作者：
M. Wiesmeier;M. Steffens;A. Kölbl;I. Kögel‐Knabner
DOI：
10.1007/978-981-32-9382-3_6
发表时间：
2019-09
期刊：
Springer Geography
影响因子：
--
作者：
Wei Zhou;Jian-long Li;T. Yue
通讯作者：
Wei Zhou;Jian-long Li;T. Yue
DOI：
--
发表时间：
2010
期刊：
Pratacultural Science
影响因子：
--
作者：
Chen Min;Cao Jianjun;Wu Gao-lin;Qin CaiFang
通讯作者：
Chen Min;Cao Jianjun;Wu Gao-lin;Qin CaiFang
影响因子：
3.7
作者：
O'Halloran LR;Borer ET;Seabloom EW;MacDougall AS;Cleland EE;McCulley RL;Hobbie S;Harpole WS;DeCrappeo NM;Chu C;Bakker JD;Davies KF;Du G;Firn J;Hagenah N;Hofmockel KS;Knops JM;Li W;Melbourne BA;Morgan JW;Orrock JL;Prober SM;Stevens CJ
通讯作者：
Stevens CJ
内蒙古草原放牧强度对多种生态系统服务的影响及关系
影响因子：
9.8
作者：
Fan, Fan;Liang, Cunzhu;Porter, John R.
通讯作者：
Porter, John R.