Increased plant carbon translocation linked to overyielding in grassland species mixtures.
Increased plant carbon translocation linked to overyielding in grassland species mixtures.
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DOI：
10.1371/journal.pone.0045926
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Bardgett RD
中科院分区：
文献类型：
--
作者：
De Deyn GB;Quirk H;Oakley S;Ostle NJ;Bardgett RD
植物物种丰富度和生产力通常表现出正相关关系，但其潜在机制尚不完全清楚，特别是在植物物种层面。我们研究了在物种混合物中生长的植物如何影响短期碳（C-）易位的种内速率，并确定这种短期反应是否反映在生物量产量中。我们在室外中生态系统中种植六种常见 C3 草原植物物种的单一栽培和混合物，在原位应用 13C-CO2 脉冲来追踪通过植物进入土壤并返回大气的同化碳，并量化物种特定的生物量。豆类中的 13C 富集度在豆科植物百脉根和白三叶草中最高，而最近同化的 13C 的迁移（即从叶子转移到植物其他部分）在 6 种混合物中生长的白三叶中最快。草类 Anthoxanthum odoratum 在 6 种混合物中也表现出高水平的 13C 富集，而黑麦草、车前草和蓍草的 13C 富集水平较低。通过呼吸作用造成的碳损失率在白柽柳单一栽培中最高，而在物种混合物中相对较低，而呼吸二氧化碳中 13C 的比例在单一栽培和混合物中相似。禾本科植物玉竹和豆科植物白鹤芋在 6 种混合物中得到最大程度的促进，并与百脉根一起导致 6 种混合物中净生物量的增加。这些植物物种也具有最高的 13C 标记易位率，对于玉竹和白柽柳来说，这种效应在物种混合物中生长的植物个体中最大。我们的研究表明，当豆科植物和 C3 禾本科植物混合种植时，短期植物碳易位可以加速，并且这与高产呈强烈正相关。这些结果表明，种内植物碳生理学的变化与草地系统群落水平生产力的提高之间存在机械耦合。
Plant species richness and productivity often show a positive relationship, but the underlying mechanisms are not fully understood, especially at the plant species level. We examined how growing plants in species mixture influences intraspecific rates of short-term carbon (C-) translocation, and determined whether such short-term responses are reflected in biomass yields. We grew monocultures and mixtures of six common C3 grassland plant species in outdoor mesocosms, applied a 13C-CO2 pulse in situ to trace assimilated C through plants, into the soil, and back to the atmosphere, and quantified species-specific biomass. Pulse derived 13C enrichment was highest in the legumes Lotus corniculatus and Trifolium repens, and relocation (i.e. transport from the leaves to other plant parts) of the recently assimilated 13C was most rapid in T. repens grown in 6-species mixtures. The grass Anthoxanthum odoratum also showed high levels of 13C enrichment in 6-species mixtures, while 13C enrichment was low in Lolium perenne, Plantago lanceolata and Achillea millefolium. Rates of C loss through respiration were highest in monocultures of T. repens and relatively low in species mixtures, while the proportion of 13C in the respired CO2 was similar in monocultures and mixtures. The grass A. odoratum and legume T. repens were most promoted in 6-species mixtures, and together with L. corniculatus, caused the net biomass increase in 6-species mixtures. These plant species also had highest rates of 13C-label translocation, and for A. odoratum and T. repens this effect was greatest in plant individuals grown in species mixtures. Our study reveals that short-term plant C translocation can be accelerated in plant individuals of legume and C3 grass species when grown in mixtures, and that this is strongly positively related to overyielding. These results demonstrate a mechanistic coupling between changes in intraspecific plant carbon physiology and increased community level productivity in grassland systems.
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影响因子：
5.5
作者：
De Deyn, Gerlinde B.;Quirk, Helen;Bardgett, Richard D.
通讯作者：
Bardgett, Richard D.
影响因子：
9.7
作者：
Ostle, N.;Briones, M. J. I.;Sleep, D.
通讯作者：
Sleep, D.
影响因子：
5.5
作者：
De Deyn, GB;Raaijmakers, CE;Van der Putten, WH
通讯作者：
Van der Putten, WH
影响因子：
2.7
作者：
Roscher, Christiane;Schmid, Bernhard;Schulze, Ernst-Detlef
通讯作者：
Schulze, Ernst-Detlef
影响因子：
9.7
作者：
Ostle, N;Whiteley, AS;Manefield, M
通讯作者：
Manefield, M