Intensive grassland management disrupts below-ground multi-trophic resource transfer in response to drought.
Intensive grassland management disrupts below-ground multi-trophic resource transfer in response to drought.
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DOI：
10.1038/s41467-022-34449-5
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发表时间：
2022-11-16
影响因子：
16.6
通讯作者：
Bardgett RD
中科院分区：
文献类型：
--
作者：
Chomel M;Lavallee JM;Alvarez-Segura N;Baggs EM;Caruso T;de Castro F;Emmerson MC;Magilton M;Rhymes JM;de Vries FT;Johnson D;Bardgett RD
土地管理对土壤食物网的改变可能会改变生态系统过程对极端气候的反应，但经验支持有限，所涉及的机制仍不清楚。在这里，我们量化草地管理如何修改最近的光合作用和土壤氮通过植物和土壤食物网在干旱后的一段时间内，在一个受控的现场实验，使用原位13 C和15 N脉冲标记在集中和广泛管理的领域。我们表明，集约化管理减少植物碳（C）的捕获和转移，通过食物网和土壤呼吸的组成部分相比，粗放式管理。我们观察到的遗产影响干旱的C转移途径，主要是在集约化管理的草原，通过增加植物C同化和13 C释放土壤CO2流出，但减少其转移到根，细菌和弹尾目。我们的工作提供了深入了解草地管理和干旱对碳转移途径的相互作用，并强调通过多营养网络捕获和快速转移光合产物是维持草地抗旱性的关键。土地利用集约化可能会使土壤食物网从干旱中恢复的能力降低。在这里，作者发现，密集的草地管理损害了干旱后根系和土壤生物群的近期光合作用通量，而广泛的草地管理缓冲了干旱的影响。
Modification of soil food webs by land management may alter the response of ecosystem processes to climate extremes, but empirical support is limited and the mechanisms involved remain unclear. Here we quantify how grassland management modifies the transfer of recent photosynthates and soil nitrogen through plants and soil food webs during a post-drought period in a controlled field experiment, using in situ 13C and 15N pulse-labelling in intensively and extensively managed fields. We show that intensive management decrease plant carbon (C) capture and its transfer through components of food webs and soil respiration compared to extensive management. We observe a legacy effect of drought on C transfer pathways mainly in intensively managed grasslands, by increasing plant C assimilation and 13C released as soil CO2 efflux but decreasing its transfer to roots, bacteria and Collembola. Our work provides insight into the interactive effects of grassland management and drought on C transfer pathways, and highlights that capture and rapid transfer of photosynthates through multi-trophic networks are key for maintaining grassland resistance to drought. Land use intensification could make soil food webs less able to recover from drought. Here, the authors find that intensive grassland management impairs recent photosynthate flux to roots and soil biota after drought, whereas extensive grassland management buffers the legacy of drought.
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影响因子：
6.9
作者：
Baptist F;Tcherkez G;Aubert S;Pontailler JY;Choler P;Nogués S
通讯作者：
Nogués S
影响因子：
4.8
作者：
Clark, JS
通讯作者：
Clark, JS
影响因子：
3.8
作者：
Baggs, EM;Rees, RM;Vinten, AJA
通讯作者：
Vinten, AJA
影响因子：
2
作者：
Caruso, T.;Migliorini, M.
通讯作者：
Migliorini, M.
影响因子：
5.7
作者：
Cole, Andrew J.;Griffiths, Robert I.;Bardgett, Richard D.
通讯作者：
Bardgett, Richard D.