Do soil depth and plant community composition interact to modify the resistance and resilience of grassland ecosystem functioning to drought?
Do soil depth and plant community composition interact to modify the resistance and resilience of grassland ecosystem functioning to drought?
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DOI：
10.1002/ece3.7963
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发表时间：
2021-09
影响因子：
2.6
通讯作者：
Bardgett RD
中科院分区：
文献类型：
--
作者：
Fry EL;Wilkinson A;Johnson D;Pritchard WJ;Ostle NJ;Baggs EM;Bardgett RD
虽然干旱对植物群落及其相关生态系统功能的影响已经得到了很好的研究，但很少有研究考虑到土壤深度和深度异质性如何改变响应。我们进行了一个中围生态系统的研究，包括浅和深的土壤，和变量和统一的土壤深度，和两个层次的植物群落组成，并将它们暴露在模拟干旱测试这些处理对二氧化碳通量，植物功能性状和土壤化学性质的恢复力的相互作用。我们检验了以下假设：（a）浅土层和不同深度的土壤，由于更多地利用植物性状策略，导致生态系统功能对干旱的抵抗力和恢复力增强;（B）与密集管理的高肥力土壤相关的植物群落，将比广泛管理的低肥力植物群落具有更多的利用根系性状。这些特性将与更高的抗旱性和恢复力有关，并可能与土壤深度和深度异质性相互作用，放大对生态系统功能的影响。我们的研究结果表明，虽然土壤深度/异质性对植物驱动的碳通量有很强的影响，但它不影响对干旱的抵抗力或恢复力，并且对植物有效碳或氮没有处理效应。我们观察到一个显着的增加，在浅和可变的土壤中的剥削根性状相对于深和均匀，这可能导致了补偿效应，导致类似的干旱反应。无论土壤深度或土壤深度异质性如何，集约化管理的植物群落组成比更多样化的“广泛”群落更具抗旱能力。在集中管理的植物群落中，根系性状更能代表开发策略。两者合计，我们的研究结果表明，根性状的重组响应土壤深度可以缓冲干旱对生态系统功能的影响。草地土壤深度和深度异质性可能对生态系统功能和对干旱的响应产生影响，但到目前为止，在实验设计中被忽视了。在温室研究中，我们研究了植物物种多样性，土壤深度异质性和干旱的一系列生态系统功能之间的相互作用。我们发现，土壤深度直接改变植物根系性状的表达，这对群落对干旱的反应有级联效应。
While the effect of drought on plant communities and their associated ecosystem functions is well studied, little research has considered how responses are modified by soil depth and depth heterogeneity. We conducted a mesocosm study comprising shallow and deep soils, and variable and uniform soil depths, and two levels of plant community composition, and exposed them to a simulated drought to test for interactive effects of these treatments on the resilience of carbon dioxide fluxes, plant functional traits, and soil chemical properties. We tested the hypotheses that: (a) shallow and variable depth soils lead to increased resistance and resilience of ecosystem functions to drought due to more exploitative plant trait strategies; (b) plant communities associated with intensively managed high fertility soils, will have more exploitative root traits than extensively managed, lower fertility plant communities. These traits will be associated with higher resistance and resilience to drought and may interact with soil depth and depth heterogeneity to amplify the effects on ecosystem functions. Our results showed that while there were strong soil depth/heterogeneity effects on plant‐driven carbon fluxes, it did not affect resistance or resilience to drought, and there were no treatment effects on plant‐available carbon or nitrogen. We did observe a significant increase in exploitative root traits in shallow and variable soils relative to deep and uniform, which may have resulted in a compensation effect which led to the similar drought responses. Plant community compositions representative of intensive management were more drought resilient than more diverse “extensive” communities irrespective of soil depth or soil depth heterogeneity. In intensively managed plant communities, root traits were more representative of exploitative strategies. Taken together, our results suggest that reorganization of root traits in response to soil depth could buffer drought effects on ecosystem functions. Soil depth, and depth heterogeneity in grassland could have consequences for ecosystem function and response to drought, but so far have been overlooked in experimental designs. In a greenhouse study, we examined the interaction between plant species diversity, soil depth heterogeneity and drought for a range of ecosystem functions. We showed that soil depth directly alters plant root trait expression, which has a cascading effect on the response of the community to drought.
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影响因子：
9.7
作者：
Bardgett, Richard D.;van der Wal, Rene;Dutton, Stephen
通讯作者：
Dutton, Stephen
DOI：
10.1038/s41396-018-0089-x
发表时间：
2018-06
期刊：
The ISME journal
影响因子：
--
作者：
Leff JW;Bardgett RD;Wilkinson A;Jackson BG;Pritchard WJ;De Long JR;Oakley S;Mason KE;Ostle NJ;Johnson D;Baggs EM;Fierer N
通讯作者：
Fierer N
影响因子：
8.8
作者：
Gould IJ;Quinton JN;Weigelt A;De Deyn GB;Bardgett RD
通讯作者：
Bardgett RD
影响因子：
5.6
作者：
Comas LH;Becker SR;Cruz VM;Byrne PF;Dierig DA
通讯作者：
Dierig DA
影响因子：
3.2
作者：
Baer, SG;Collins, SL;Fiedler, AK
通讯作者：
Fiedler, AK