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Plant functional groups mediate effects of climate and soil factors on species richness and community biomass in grasslands of Mongolian Plateau
Journal of Plant Ecology ( IF 2.7 ) Pub Date : 2021-03-09 , DOI: 10.1093/jpe/rtab021
Zijing Li 1, 2 , Maowei Liang 3 , Zhiyong Li 2 , Pierre Mariotte 4 , Xuze Tong 5 , Jinghui Zhang 2 , Lei Dong 6 , Ying Zheng 2 , Wenhong Ma 2 , Liqing Zhao 2 , Lixin Wang 2 , Lu Wen 2 , Indree Tuvshintogtokh 7 , Elise S Gornish 8 , Zhenhua Dang 2 , Cunzhu Liang 2 , Frank Yonghong Li 2
Affiliation  

Abstract
Aims
Functional group composition of a plant community is mainly driven by environmental factors and is one of the main determinants of grassland biodiversity and productivity. Therefore, it is important to understand the role of plant functional groups (PFGs) in mediating the impact of environmental conditions on ecosystem functions and biodiversity.
Methods
We measured plant biomass and species richness (SR) of grasslands in 65 sites on the Mongolian Plateau and classified 157 perennial herbaceous plants into two main PFGs (namely grasses and forbs). Using the random forest model and ordinary least squares regression, we identified that environmental factors (i.e. aridity index, soil total nitrogen [STN] and pH) were significantly related to the SR and aboveground biomass (AGB) of PFGs. We then used structural equation modeling to explore the relationship between the identified environmental factors and community SR and biomass, and the role of PFGs in driving this relationship.
Important Findings
We found that aridity index had unimodal relationships with both AGB and SR of the PFGs and the whole community. All SR and biomass metrics were significantly related to STN and pH. The relationship between aridity index and community biomass was mediated by an increase in the AGB of grasses. The influence of STN and pH on community SR was mainly due to their regulation in the SR of forbs. Our results indicate that community composition and the identity of the PFGs play a key role in linking environmental factors to ecosystem functioning.


中文翻译:

植物功能群介导气候和土壤因子对蒙古高原草原物种丰富度和群落生物量的影响

摘要
目的
植物群落的功能群组成主要由环境因素驱动,是草地生物多样性和生产力的主要决定因素之一。因此,重要的是要了解植物功能组(PFG)在调解环境条件对生态系统功能和生物多样性的影响中的作用。
方法
我们在蒙古高原的65个地点测量了草原的植物生物量和物种丰富度(SR),并将157种多年生草本植物分为两种主要的PFG(即草和草)。使用随机森林模型和普通最小二乘回归,我们确定环境因素(即干旱指数,土壤总氮[STN]和pH)与PFG的SR和地上生物量(AGB)显着相关。然后,我们使用结构方程模型来探索已确定的环境因素与社区SR和生物量之间的关系,以及PFG在驱动这种关系中的作用。
重要发现
我们发现,干旱指数与PFG和整个社区的AGB和SR具有单峰关系。所有SR和生物量指标均与STN和pH显着相关。干旱指数与群落生物量之间的关系是由草的AGB增加所介导的。STN和pH对群落SR的影响主要是由于它们对小穗SR的调控。我们的结果表明,社区组成和PFG的身份在将环境因素与生态系统功能联系起来方面起着关键作用。
更新日期:2021-04-28
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