Tree physiological responses to above-ground herbivory directly modify below-ground processes of soil carbon and nitrogen cycling
Tree physiological responses to above-ground herbivory directly modify below-ground processes of soil carbon and nitrogen cycling
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DOI：
10.1111/j.1461-0248.2004.00604.x
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发表时间：
2004-06-01
期刊：
影响因子：
8.8
通讯作者：
Bardgett, RD
中科院分区：
文献类型：
--
作者：
Ayres, E;Heath, J;Bardgett, RD
地下食草动物在陆地生态系统中普遍存在，但其对地下过程的影响和对植物的后果仍不明确。为了研究是否个别树木的生理反应可能会改变土壤养分的有效性，我们进行了水青冈。（欧洲山毛榉）和冷杉（Abies alba Mill.）（银冷杉）模拟叶食草动物在两个生长季节。草地草食动物增加了土壤中氮的矿化和无机氮的有效性。从植物根部到土壤的总碳输入量尚不清楚，然而，使用稳定同位素技术测量的土壤中的碳封存不受草食动物的影响。水青冈响应草食动物产生更大的叶子，增加光合能力和N含量，这在很大程度上弥补了生物量的损失，冷杉没有表现出这样的反应。我们的结论是，尽管大种间差异的生长反应，树的生理反应，叶面草食动物能够直接修改土壤生物过程。
Above-ground herbivory is ubiquitous in terrestrial ecosystems, yet its impacts on below-ground processes and consequences for plants remain ambiguous. To examine whether physiological responses of individual trees may potentially modify soil nutrient availability, we subjected Fagus sylvatica L. (European beech) and Abies alba Mill. (silver fir) to simulated foliar herbivory over two growing seasons. Above-ground herbivory enhanced N mineralization and inorganic N availability in the soil. The total input of C from the plant roots to the soil is not known; however, carbon sequestration in the soil, measured using stable isotopic techniques, was unaffected by herbivory. Fagus responded to herbivory by producing larger leaves, with increased photosynthetic capacity and N content, which largely compensated for the loss of biomass; Abies exhibited no such response. We conclude that despite large interspecific differences in the growth response, tree physiological responses to foliar herbivory are capable of directly modifying soil biological processes.