Plant functional groups mediate effects of climate and soil factors on species richness and community biomass in grasslands of Mongolian Plateau

被引：20

作者：

Li, Zijing ^{[1
,2
,3
]}

Liang, Maowei ^{[4
]}

Li, Zhiyong ^{[2
,3
]}

Mariotte, Pierre ^{[5
]}

Tong, Xuze ^{[6
]}

Zhang, Jinghui ^{[2
,3
]}

Dong, Lei ^{[7
]}

Zheng, Ying ^{[2
,3
]}

Ma, Wenhong ^{[2
,3
]}

Zhao, Liqing ^{[2
,3
]}

Wang, Lixin ^{[2
,3
]}

Wen, Lu ^{[2
,3
]}

Tuvshintogtokh, Indree ^{[8
]}

Gornish, Elise S. ^{[9
]}

Dang, Zhenhua ^{[2
,3
]}

Liang, Cunzhu ^{[2
,3
]}

Li, Frank Yonghong ^{[2
,3
]}

机构：

[1] Inner Mongolia Agr Univ, Dept Grassland Sci,Inner Mongolia Key Lab Grassla, Key Lab Grassland Resources,Minist Agr & Rural Af, Minist Educ,Key Lab Forage Cultivat Proc & High E, Hohhot 010011, Peoples R China

[2] Inner Mongolia Univ, Dept Ecol, Key Lab Ecol & Resource Use Mongolian Plateau, Minist Educ,Sch Ecol & Environm, Hohhot 010021, Peoples R China

[3] Inner Mongolia Univ, Sch Ecol & Environm, Inner Mongolia Key Lab Grassland Ecol, Hohhot 010021, Peoples R China

[4] Peking Univ, Minist Educ, Dept Ecol, Inst Ecol,Coll Urban & Environm Sci,Key Lab Earth, Beijing 100871, Peoples R China

[5] Grazing Syst Grp, Agroscope, Grazing Syst, Route Duillier 50, CH-1260 Nyon, Switzerland

[6] Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Lab Grassland Ecol Remote Sensing, Beijing 100081, Peoples R China

[7] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China

[8] Mongolian Acad Sci, Inst Gen & Expt Biol, Ulaanbaatar 51, Mongolia

[9] Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ 85721 USA

来源：

JOURNAL OF PLANT ECOLOGY | 2021年 / 14卷 / 04期

关键词：

climate; community composition; plant functional groups; Mongolian Plateau; soil properties; TERRESTRIAL ECOSYSTEMS; NITROGEN DEPOSITION; BIODIVERSITY LOSS; PRODUCTIVITY; DIVERSITY; HETEROGENEITY; RESPONSES; PATTERNS; COMPLEMENTARITY; THRESHOLDS;

D O I：

10.1093/jpe/rtab021

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

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.

引用

页码：679 / 691

页数：13

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