Above- and belowground biodiversity jointly drive ecosystem stability in natural alpine grasslands on the Tibetan Plateau
Above- and belowground biodiversity jointly drive ecosystem stability in natural alpine grasslands on the Tibetan Plateau
复制标题
青藏高原天然高寒草原地上和地下生物多样性共同驱动生态系统稳定
DOI：
10.1111/geb.13307
复制
发表时间：
2021-04-22
影响因子：
6.4
通讯作者：
He, Jin-Sheng
中科院分区：
文献类型：
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作者：
Chen, Litong;Jiang, Lin;He, Jin-Sheng
目的 大多数现有的研究生态系统稳定性的生物机制的研究都集中在地上生物多样性。地下生物多样性是否以及如何影响自然生态系统的稳定性在很大程度上尚不清楚。在本研究中，我们调查了地上和地下生物多样性与大土壤梯度和气候条件下草地生物量生产的时间稳定性之间的关系。地点青藏高原。时间段2001-2016。主要分类单元研究了高山草和土壤细菌、丛枝菌根（AM）真菌和动物群。方法我们将在青藏高原54个高山草地生态系统中进行的实地生物多样性调查与卫星感知代理相结合2001-2016 年生态系统生产力（增强植被指数，EVI）。初级生产力的时间稳定性计算为该时期平均年峰值EVI与年峰值EVI标准差的比值。使用经典的植被调查方法确定植物多样性，使用高通量测序方法测量土壤细菌和AM真菌多样性，并使用改进的Berlese-Tullgren方法提取后在目水平上对土壤动物进行计数和鉴定。结果我们的结果表明，地上和地下生物多样性与生态系统稳定性呈正相关。地下生物多样性不仅直接影响生态系统的稳定性，还通过植物多样性和土壤肥力间接影响生态系统的稳定性。此外，土壤pH值、气候及其变异性强烈影响土壤生物多样性，进而影响生态系统的稳定性。主要结论我们的研究证明了地下生物多样性在调节生态系统稳定性中不可或缺的作用，强调了在面临持续环境变化的脆弱高山生态系统中保护这种“隐藏”生物多样性的必要性。
Aim Most existing studies that examined the biotic mechanisms of ecosystem stability have focused on aboveground biodiversity. Whether and how belowground biodiversity affects the stability of natural ecosystems is largely unknown. In the present study, we investigated the relationships between above- and belowground biodiversity and the temporal stability of grassland biomass production across a large gradient of soil and climatic conditions.Location Tibetan Plateau.Time period 2001-2016.Major taxa studied Alpine grass and soil bacteria, arbuscular mycorrhiza (AM) fungi and fauna.Methods We coupled a field biodiversity survey conducted in 54 alpine grassland ecosystems across the Tibetan Plateau with a satellite-sensed proxy (enhanced vegetation index, EVI) of ecosystem productivity during 2001-2016. The temporal stability of primary productivity was calculated as the ratio of the mean annual peak EVI to the standard deviation of the annual peak EVI over this period. Plant diversity was determined using a classic vegetation survey approach, soil bacterial and AM fungal diversity were measured using a high-throughput sequencing approach, and soil fauna was counted and identified at the order level after being extracted using a modified Berlese-Tullgren method.Results Our results demonstrated that both above- and belowground biodiversity were positively associated with ecosystem stability. Belowground biodiversity not only affected ecosystem stability directly, but also influenced it indirectly through plant diversity and soil fertility. Furthermore, soil pH, climate and its variability strongly influenced soil biodiversity, which in turn influenced ecosystem stability.Main conclusions Our study demonstrates the indispensable role of belowground biodiversity in regulating ecosystem stability, emphasizing the necessity of conserving this 'hidden' biodiversity in fragile alpine ecosystems facing ongoing environmental change.