Invasive plants differentially affect soil biota through litter and rhizosphere pathways: a meta-analysis
Invasive plants differentially affect soil biota through litter and rhizosphere pathways: a meta-analysis
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入侵植物通过凋落物和根际途径对土壤生物群产生不同的影响：荟萃分析
DOI：
10.1111/ele.13181
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发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
Hu Shuijin
中科院分区：
文献类型：
--
作者：
Zhang Pei;Li Bo;Wu Jihua;Hu Shuijin
入侵植物通过凋落物和根际输入影响土壤生物区系，但这些影响的方向和幅度是可变的。我们进行了Meta分析，以检查凋落物和根际入侵植物对土壤群落和养分循环的不同影响。结果表明，入侵植物通过凋落物途径使细菌生物量增加了16%，食腐动物增加了119%，食微生物增加了89%。在根际，入侵植物减少了12%的细菌生物量，55%的食草动物丰度和52%的捕食者丰度，但增加了36%的AM真菌生物量。此外，CO2排放量、氮矿化速率和酶活性均高于本地根际土壤。这些结果表明，入侵植物可能支持更多的分解者，反过来刺激养分释放通过凋落物效应，并通过减少根放牧，但在根际形成更多的共生体，提高养分吸收。因此，我们假设基于凋落物和根的循环可能与通过刺激养分循环产生入侵者对土壤系统的正反馈有关，从而促进植物入侵。我们从不同背景下的有限案例中的研究结果表明，需要更多的研究来区分单个系统中的凋落物和根际效应，以更好地了解入侵植物-土壤相互作用。
Invasive plants affect soil biota through litter and rhizosphere inputs, but the direction and magnitude of these effects are variable. We conducted a meta‐analysis to examine the different effects of litter and rhizosphere of invasive plants on soil communities and nutrient cycling. Our results showed that invasive plants increased bacterial biomass by 16%, detritivore abundance by 119% and microbivore abundance by 89% through litter pathway. In the rhizosphere, invasive plants reduced bacterial biomass by 12%, herbivore abundance by 55% and predator abundance by 52%, but increased AM fungal biomass by 36%. Moreover, CO2efflux, N mineralisation rate and enzyme activities were all higher in invasive than native rhizosphere soils. These findings indicate that invasive plants may support more decomposers that in turn stimulate nutrient release via litter effect, and enhance nutrient uptake by reducing root grazing but forming more symbioses in the rhizosphere. Thus, we hypothesise that litter‐ and root‐based loops are probably linked to generate positive feedback of invaders on soil systems through stimulating nutrient cycling, consequently facilitating plant invasion. Our findings from limited cases with diverse contexts suggest that more studies are needed to differentiate litter and rhizosphere effects within single systems to better understand invasive plant‐soil interactions.