Plant traits and soil fertility mediate productivity losses under extreme drought in C-3 grasslands
Luo,Wentao; Griffin-Nolan,Robert J.; Ma,Wang; Liu,Bo; Zuo,Xiaoan; Xu,Chong; Yu,Qiang; Luo,Yahuang; Mariotte,Pierre; Smith,Melinda D.; Collins,Scott L.; Knapp,Alan K.; Wang,Zhengwen; Han,Xingguo
Source PublicationECOLOGY
AbstractExtreme drought decreases aboveground net primary production (ANPP) in most grasslands, but the magnitude of ANPP reductions varies especially in C-3-dominated grasslands. Because the mechanisms underlying such differential ecosystem responses to drought are not well resolved, we experimentally imposed an extreme 4-yr drought (2015-2018) in two C-3 grasslands that differed in aridity. These sites had similar annual precipitation and dominant grass species (Leymus chinensis) but different annual temperatures and thus water availability. Drought treatments differentially affected these two semiarid grasslands, with ANPP of the drier site reduced more than at the wetter site. Structural equation modeling revealed that community-weighted means for some traits modified relationships between soil moisture and ANPP, often due to intraspecific variation. Specifically, drought reduced community mean plant height at both sites, resulting in a reduction in ANPP beyond that attributable to reduced soil moisture alone. Higher community mean leaf carbon content enhanced the negative effects of drought on ANPP at the drier site, and ANPP-soil-moisture relationships were influenced by soil C:N ratio at the wetter site. Importantly, neither species richness nor functional dispersion were significantly correlated with ANPP at either site. Overall, as expected, soil moisture was a dominant, direct driver of ANPP response to drought, but differential sensitivity to drought in these two grasslands was also related to soil fertility and plant traits.
Keywordcommunity-weighted traits drought functional dispersion plant traits productivity soil fertility species richness FUNCTIONAL DIVERSITY BIODIVERSITY RESPONSES SELECTION
WOS IDWOS:000686031300001
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Affiliation1.Chinese Acad Sci, Inst Appl Ecol, Erguna Forest Steppe Ecotone Res Stn, Shenyang 110016, Peoples R China
2.Griffin-Nolan, Robert J.] Syracuse Univ, Dept Biol, Syracuse, NY 13244 USA
3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Urat Desert Grassland Res Stn, Lanzhou 730000, Peoples R China
4.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Hulunber Grassland Ecosyst Observat & Res St, Beijing 100081, Peoples R China
5.Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China
6.Agroscope, Grazing Syst, Route Duillier 50, CH-1260 Nyon, Switzerland
7.Smith, Melinda D.; Knapp, Alan K.] Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA
8.Smith, Melinda D.] Colorado State Univ, Grad Degree Program Ecol, Ft Collins, CO 80523 USA
9.Collins, Scott L.] Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA
10.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
11.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Luo,Wentao,Griffin-Nolan,Robert J.,Ma,Wang,et al. Plant traits and soil fertility mediate productivity losses under extreme drought in C-3 grasslands[J]. ECOLOGY,2021,102(10):e03465.
APA Luo,Wentao.,Griffin-Nolan,Robert J..,Ma,Wang.,Liu,Bo.,Zuo,Xiaoan.,...&Han,Xingguo.(2021).Plant traits and soil fertility mediate productivity losses under extreme drought in C-3 grasslands.ECOLOGY,102(10),e03465.
MLA Luo,Wentao,et al."Plant traits and soil fertility mediate productivity losses under extreme drought in C-3 grasslands".ECOLOGY 102.10(2021):e03465.
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