Above- and belowground trait linkages of dominant species shape responses of alpine steppe composition to precipitation changes in the Tibetan Plateau
| Autor: | Dajie Gong, Guoying Zhou, Qun Ma, Shihu Zhang, Yue Zhang, Zhi Zheng |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Stipa purpurea geography Plateau geography.geographical_feature_category 010504 meteorology & atmospheric sciences Ecology Alpine-steppe Plant Science 010603 evolutionary biology 01 natural sciences Trait Leymus secalinus Environmental science Composition (visual arts) Precipitation Plant traits Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences |
| Zdroj: | Journal of Plant Ecology. 14:569-579 |
| ISSN: | 1752-993X |
| DOI: | 10.1093/jpe/rtab011 |
| Popis: | Aims Human activities and global changes have led to alterations in global and regional precipitation regimes. Despite extensive studies on the effects of changes in precipitation regimes on plant community composition across different types of grassland worldwide, few studies have specifically focused on the effects of precipitation changes on high-altitude alpine steppe at community and plant species levels in the Tibetan Plateau. Methods We investigated the effects of growing-season precipitation changes (reduced precipitation by 50%, ambient precipitation, enhanced precipitation by 50%) for 6 years on plant community composition in an alpine steppe of the Tibetan Plateau by linking above- to belowground traits of dominant species. Important Findings We found that reduced precipitation shifted community composition from dominance by bunchgrass (primarily Stipa purpurea) to dominance by rhizomatous grass (primarily Leymus secalinus). Roots and leaf traits of L. secalinus and S. purpurea differed in their responses to reduced precipitation. Reduced precipitation enhanced root vertical length and carbon (C) allocation to deep soil layers, and decreased the leaf width in L. secalinus, but it did not change the traits in S. purpurea. Moreover, reduced precipitation significantly enhanced rhizome biomass, length, diameter and adventitious root at the rhizome nodes in L. secalinus. These changes in traits may render rhizomatous grass greater competitive during drought stress. Therefore, our findings highlight important roles of above- and belowground traits of dominant species in plant community composition of alpine steppe under precipitation change. |
| Databáze: | OpenAIRE |
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