Food web structure in exotic eucalyptus plantations in Southern China: stable isotope (δ13C, δ15N) analyses reveal the importance of understory and landscape-level planning
Food web structure in exotic eucalyptus plantations in Southern China: stable isotope (δ13C, δ15N) analyses reveal the importance of understory and landscape-level planning
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中国南方外来桉树人工林的食物网结构：稳定同位素（δ13C、δ15N）分析揭示了林下和景观层面规划的重要性
DOI：
10.1016/j.gecco.2020.e01259
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发表时间：
2020
影响因子：
4
通讯作者：
Jiang Aiwu
中科院分区：
文献类型：
--
作者：
Zhou Xuemeng;Mammides Christos;Zhou Xiaoguo;Hobson A. Keith;Zhu Hongguang;Wen Yuanguang;Jiang Aiwu
外来桉树（Eucalyptus spp.）在许多热带和亚热带国家被广泛种植，是一种快速生长的树种。桉树种植园的扩张导致了影响生物多样性的几个问题，如社区内物种的丧失以及生态系统功能的改变。以往对桉树人工林生物多样性的研究主要集中在单一的生物类群或营养级上。如何在这些人工林的整个生物群落和营养相互作用的影响仍然知之甚少。我们对1年至25年前种植的42个桉树种植园的初级生产者和消费者进行了全面收集。初级生产者（包括植物物质和土壤有机质）的δ 13 C和δ 15 N值均存在显著差异。桉树人工林消费者的δ 13 C和δ 15 N值分别为-30.2 ‰ ~-18.6 ‰和-1.9 ‰ ~ 8.4‰。桉树人工林中5个营养类群的δ 13 C和δ 15 N值存在差异。桉树人工林的营养水平估计为1.4至4.4。稳定同位素证据表明，外来桉树，林下植物和相邻的甘蔗，有助于消费者的食物网。研究结果表明，桉树人工林食物网具有完整的营养结构，并依赖于一系列的食物源。养分输入通常也来自邻近地区，这表明需要保持景观水平的多样性，以增加桉树种植园的生物多样性和食物网的功能。
Exotic eucalyptus (Eucalyptusspp.) has been planted widely as a fast-growing tree species in numerous tropical and subtropical countries. The expansion of eucalyptus plantations has caused several issues affecting biodiversity, such as loss of species within communities as well as alterations to ecosystem function. Previous studies of biodiversity in eucalyptus plantations have focused on single biological groups or trophic levels. How the whole biological community and trophic interactions within these plantations are affected is still poorly known. We conducted a comprehensive collection of primary producers and consumers from 42 eucalyptus plantations planted between one and 25 years ago. Primary producers, including plant materials and soil organic matter, showed significant differences in both δ13C and δ15N values. Values of δ13C and δ15N of consumers from eucalyptus plantations varied from −30.2‰ to −18.6‰ and from −1.9‰ to 8.4‰, respectively. Both δ13C and δ15N values of consumers differed among five trophic groups that we identified in eucalyptus plantations. Trophic levels in eucalyptus plantations were estimated from 1.4 to 4.4. Stable isotope evidence showed that leaves of both exotic eucalyptus, understory and adjacent sugarcane, contributed to the consumer food webs. Our results suggested food webs associated with eucalyptus plantations had complete trophic structure and depended on a suite of food sources. Nutrient inputs were typically also derived from adjacent areas indicating that maintaining diversity at the landscape level is needed to augment biodiversity and functioning of foodwebs in eucalyptus plantations.