Impacts of tree mixtures on understory plant diversity in China
Impacts of tree mixtures on understory plant diversity in China
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DOI：
10.1016/j.foreco.2021.119545
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发表时间：
2021-07-30
影响因子：
3.7
通讯作者：
Xu, Mingxiang
中科院分区：
文献类型：
--
作者：
Gong, Chen;Tan, Qingyue;Xu, Mingxiang
林下植物是森林生物多样性的重要组成部分，在森林功能中起着重要作用。虽然有令人信服的证据表明，混合种人工林比单一栽培更有利于提高森林生态系统的生产力和稳定性，但混合种人工林对林下植物多样性的影响仍不确定。本研究基于76篇同行评议研究的205对植物物种混合和相应单一栽培的观测数据进行了荟萃分析，以评估树木混合对中国UPD的影响。结果表明，混种人工林的UPD平均比单种人工林高18.2%。这种积极的混合效应随着时间的推移而增加，但UPD的效应大小从负向正转变至少需要十年的时间。在不同混交林类型中，乔灌木混交林比乔木混交林更有利于维持UPD，且随着时间的推移，这种正效应更为显著。此外，UPD的响应率随年平均温度（MAT）和降水量（MAP）的增加而降低，但这种关系不显著。因此，我们的研究结果表明，在中国，种植混合树种人工林比单一栽培更有效地提高了植物的UPD。本研究揭示了不同造林模式下的UPD特征，可为森林经营提供科学依据。
Understory plants are one of the important components of forest biological diversity and play important roles in forest function. Although convincing evidence exists that mixed-species plantations are more conducive to increase the productivity and stability of forest ecosystems than monocultures, the effect of mixed-species plantations on the understory plant diversity (UPD) remains uncertain. This study conducted a meta-analysis based on 205 paired observations of plant species mixtures and corresponding monocultures from 76 peer-reviewed studies to assess the impact of tree mixtures on the UPD in China. The results showed that the UPD was on average 18.2 % higher in mixed-species plantations than in monocultures. This positive mixture effect increased over time, but it would take at least ten years for the effect size of UPD to change from negative to positive. In terms of different mixed forest types, tree-shrub mixtures were more beneficial to maintain the UPD than treetree mixtures, and this positive effect was more significant over time. In addition, the response ratio of UPD decreased with mean annual temperature (MAT) and precipitation (MAP), but this relationship was not significant. Therefore, our results suggested that planting mixed-species plantations was a more effective approach to enhance the UPD than monocultures in China. This study revealed the characteristics of UPD under different afforestation modes and could provide a scientific basis for forest management.