loading page

Aridity and overgrazing decrease soil carbon storage by decreasing grassland plant diversity
  • +11
  • Jushan Liu,
  • Forest Isbell,
  • Quanhui Ma,
  • Ying Chen,
  • Fu Xing,
  • Wei Sun,
  • Ling Wang,
  • Jian Li,
  • Yunbo Wang ,
  • Fujiang Hou,
  • Xiaoping Xin,
  • Zhibiao Nan,
  • Nico Eisenhauer,
  • Deli Wang
Jushan Liu
Northeast Normal University

Corresponding Author:[email protected]

Author Profile
Forest Isbell
University of Minnesota Twin Cities
Author Profile
Quanhui Ma
Northeast Normal University
Author Profile
Ying Chen
Northeast Normal University
Author Profile
Fu Xing
Northeast Normal University
Author Profile
Wei Sun
Northeast Normal University
Author Profile
Ling Wang
Northeast Normal University
Author Profile
Jian Li
Northeast Normal University
Author Profile
Yunbo Wang
Northeast Normal University
Author Profile
Fujiang Hou
Lanzhou University
Author Profile
Xiaoping Xin
the Chinese Academy of Agricultural Sciences
Author Profile
Zhibiao Nan
Lanzhou University
Author Profile
Nico Eisenhauer
German Institute for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, University of Leipzig
Author Profile
Deli Wang
Northeast Normal University
Author Profile

Abstract

Climate and land-use change are some of the most profound threats to the biodiversity and functioning of the Earth’s ecosystems, yet potential synergistic effects remain unclear. Here we examined how aridity and land-use (overgrazing and haying) affect aboveground biomass and soil organic carbon (SOC) through changes in plant species richness across 716 grassland sites in northern China. We found that aridity and grazing reduced aboveground biomass and SOC through decreasing plant species richness. Notably, we observed strong negative synergistic effects of aridity and grazing, suggesting that soil carbon storage was particularly threatened by grazing in arid environments. By contrast, haying reduced aboveground biomass and had no significant effect on SOC, although it increased plant species richness. Together, the results demonstrate that climate change and overgrazing mainly threaten soil carbon storage via their detrimental effects on plant diversity, and the detrimental overgrazing effects are particularly strong under arid conditions.