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Effects of extreme drought on plant nutrient uptake and resorption in rhizomatous vs bunchgrass-dominated grasslands

Oecologia, 2018-10, Vol.188 (2), p.633-643 [Peer Reviewed Journal]

Springer-Verlag GmbH Germany, part of Springer Nature 2018 ;COPYRIGHT 2018 Springer ;Oecologia is a copyright of Springer, (2018). All Rights Reserved. ;ISSN: 0029-8549 ;EISSN: 1432-1939 ;DOI: 10.1007/s00442-018-4232-1 ;PMID: 30043231

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Title:
Effects of extreme drought on plant nutrient uptake and resorption in rhizomatous vs bunchgrass-dominated grasslands
Author: Luo, Wentao ; Xu, Chong ; Ma, Wang ; Yue, Xiyuan ; Liang, Xiaosa ; Zuo, Xiaoan ; Knapp, Alan K. ; Smith, Melinda D. ; Sardans, Jordi ; Dijkstra, Feike A. ; Peñuelas, Josep ; Bai, Yongfei ; Wang, Zhengwen ; Yu, Qiang ; Han, Xingguo
Subjects: Analysis ; Animal behavior ; Biomedical and Life Sciences ; Cycles ; Dominance ; Dominant species ; Drought ; Ecology ; Ecosystems ; Environmental changes ; Environmental conditions ; GLOBAL CHANGE ECOLOGY – ORIGINAL RESEARCH ; Grasses ; Grasslands ; Hydrology/Water Resources ; Hypotheses ; Leaves ; Life Sciences ; Mineral nutrients ; Nutrient cycles ; Nutrient uptake ; Nutrients ; Plant communities ; Plant populations ; Plant Sciences ; Precipitation (Meteorology) ; Soil ; Uptake
Is Part Of: Oecologia, 2018-10, Vol.188 (2), p.633-643
Description: Both the dominance and the mass ratio hypotheses predict that plant internal nutrient cycling in ecosystems is determined by the dominant species within plant communities. We tested this hypothesis under conditions of extreme drought by assessing plant nutrient (N, P and K) uptake and resorption in response to experimentally imposed precipitation reductions in two semiarid grasslands of northern China. These two communities shared similar environmental conditions, but had different dominant species—one was dominated by a rhizomatous grass (Leymus chinensis) and the other by a bunchgrass (Stipa grandis). Results showed that responses of N to drought differed between the two communities with drought decreasing green leaf N concentration and resorption in the community dominated by the rhizomatous grass, but not in the bunchgrass-dominated community. In contrast, negative effects of drought on green leaf P and K concentrations and their resorption efficiencies were consistent across the two communities. Additionally, in each community, the effects of extreme drought on soil N, P and K supply did not change synchronously with that on green leaf N, P and K concentrations, and senesced leaf N, P and K concentrations showed no response to extreme drought. Consistent with the dominance/mass ratio hypothesis, our findings suggest that differences in dominant species and their growth form (i.e., rhizomatous vs bunch grass) play an important nutrient-specific role in mediating plant internal nutrient cycling across communities within a single region.
Publisher: Berlin/Heidelberg: Springer Science + Business Media
Language: English
Identifier: ISSN: 0029-8549
EISSN: 1432-1939
DOI: 10.1007/s00442-018-4232-1
PMID: 30043231
Source: AUTh Library subscriptions: ProQuest Central

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Effects of extreme drought on plant nutrient uptake and resorption in rhizomatous vs bunchgrass-dominated grasslands

Springer-Verlag GmbH Germany, part of Springer Nature 2018 ;COPYRIGHT 2018 Springer ;Oecologia is a copyright of Springer, (2018). All Rights Reserved. ;ISSN: 0029-8549 ;EISSN: 1432-1939 ;DOI: 10.1007/s00442-018-4232-1 ;PMID: 30043231

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