Grazing exclusion reduced soil respiration but increased its temperature sensitivity in a Meadow Grassland on the Tibetan Plateau
| Autor: | Weiyu Shi, Baocheng Zhang, Gexi Xu, Xuhui Zhou, Junji Cao, Junfeng Wang, Yiqi Luo, Tracy Hruska, Yizhao Chen, Ji Chen |
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| Rok vydání: | 2015 |
| Předmět: |
temperature sensitivity
Grazing exclusion 010504 meteorology & atmospheric sciences Q10 Growing season Soil science 01 natural sciences soil respiration Soil respiration Grazing Tibetan Plateau plant productivity Water content Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Nature and Landscape Conservation Original Research Biomass (ecology) geography Plateau geography.geographical_feature_category Ecology 04 agricultural and veterinary sciences Soil carbon Agronomy microbial biomass carbon 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science |
| Zdroj: | Ecology and Evolution |
| ISSN: | 2045-7758 |
| Popis: | Understanding anthropogenic influences on soil respiration (R s) is critical for accurate predictions of soil carbon fluxes, but it is not known how R s responds to grazing exclusion (GE). Here, we conducted a manipulative experiment in a meadow grassland on the Tibetan Plateau to investigate the effects of GE on R s. The exclusion of livestock significantly increased soil moisture and above‐ground biomass, but it decreased soil temperature, microbial biomass carbon (MBC), and R s. Regression analysis indicated that the effects of GE on R s were mainly due to changes in soil temperature, soil moisture, and MBC. Compared with the grazed blocks, GE significantly decreased soil carbon release by 23.6% over the growing season and 21.4% annually, but it increased the temperature sensitivity (Q10) of R s by 6.5% and 14.2% for the growing season and annually respectively. Therefore, GE may reduce the release of soil carbon from the Tibetan Plateau, but under future climate warming scenarios, the increases in Q10 induced by GE could lead to increased carbon emissions. |
| Databáze: | OpenAIRE |
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