Cargando…
Changes in Temperature Sensitivity and Activation Energy of Soil Organic Matter Decomposition in Different Qinghai-Tibet Plateau Grasslands
Qinghai-Tibet Plateau grasslands are unique geographical regions and store substantial soil organic matter (SOM) in the soil surface, which make them very sensitive to global climate change. Here, we focused on three main grassland types (alpine meadow, steppe, and desert) and conducted a soil incub...
Autores principales: | , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2015
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4503348/ https://www.ncbi.nlm.nih.gov/pubmed/26176705 http://dx.doi.org/10.1371/journal.pone.0132795 |
_version_ | 1782381289973743616 |
---|---|
author | Li, Jie He, Nianpeng Wei, Xuehong Gao, Yang Zuo, Yao |
author_facet | Li, Jie He, Nianpeng Wei, Xuehong Gao, Yang Zuo, Yao |
author_sort | Li, Jie |
collection | PubMed |
description | Qinghai-Tibet Plateau grasslands are unique geographical regions and store substantial soil organic matter (SOM) in the soil surface, which make them very sensitive to global climate change. Here, we focused on three main grassland types (alpine meadow, steppe, and desert) and conducted a soil incubation experiment at five different temperatures (5, 10, 15, 20, and 25°C) to investigate SOM decomposition rates (R), temperature sensitivity (Q (10)), and activation energy (E (a)). The results showed that grassland type and incubation temperature had significant impact on R (P < 0.001), and the values of R were exponential correlated with incubation temperature in three alpine grasslands. At the same temperature, R was in the following order: alpine meadow > alpinesteppe > alpine desert. The Q (10) values differed significantly among different grasslands, and the overall trends were as follows: alpine meadow (1.56 ± 0.09) < alpine steppe (1.88 ± 0.23) < alpine desert (2.39 ± 0.32). Moreover, the E (a) values differed significantly across different grassland types (P < 0.001) and increased with increasing incubation time. The exponential negative correlations between E (a) and R at 20°C across all grassland types (all Ps < 0.001) indicated that the substrate-quality temperature hypothesis is applicable to the alpine grasslands. Our findings provide new insights for understanding the responses of SOM decomposition and storage to warming scenarios in this Plateau. |
format | Online Article Text |
id | pubmed-4503348 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-45033482015-07-17 Changes in Temperature Sensitivity and Activation Energy of Soil Organic Matter Decomposition in Different Qinghai-Tibet Plateau Grasslands Li, Jie He, Nianpeng Wei, Xuehong Gao, Yang Zuo, Yao PLoS One Research Article Qinghai-Tibet Plateau grasslands are unique geographical regions and store substantial soil organic matter (SOM) in the soil surface, which make them very sensitive to global climate change. Here, we focused on three main grassland types (alpine meadow, steppe, and desert) and conducted a soil incubation experiment at five different temperatures (5, 10, 15, 20, and 25°C) to investigate SOM decomposition rates (R), temperature sensitivity (Q (10)), and activation energy (E (a)). The results showed that grassland type and incubation temperature had significant impact on R (P < 0.001), and the values of R were exponential correlated with incubation temperature in three alpine grasslands. At the same temperature, R was in the following order: alpine meadow > alpinesteppe > alpine desert. The Q (10) values differed significantly among different grasslands, and the overall trends were as follows: alpine meadow (1.56 ± 0.09) < alpine steppe (1.88 ± 0.23) < alpine desert (2.39 ± 0.32). Moreover, the E (a) values differed significantly across different grassland types (P < 0.001) and increased with increasing incubation time. The exponential negative correlations between E (a) and R at 20°C across all grassland types (all Ps < 0.001) indicated that the substrate-quality temperature hypothesis is applicable to the alpine grasslands. Our findings provide new insights for understanding the responses of SOM decomposition and storage to warming scenarios in this Plateau. Public Library of Science 2015-07-15 /pmc/articles/PMC4503348/ /pubmed/26176705 http://dx.doi.org/10.1371/journal.pone.0132795 Text en © 2015 Li et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Li, Jie He, Nianpeng Wei, Xuehong Gao, Yang Zuo, Yao Changes in Temperature Sensitivity and Activation Energy of Soil Organic Matter Decomposition in Different Qinghai-Tibet Plateau Grasslands |
title | Changes in Temperature Sensitivity and Activation Energy of Soil Organic Matter Decomposition in Different Qinghai-Tibet Plateau Grasslands |
title_full | Changes in Temperature Sensitivity and Activation Energy of Soil Organic Matter Decomposition in Different Qinghai-Tibet Plateau Grasslands |
title_fullStr | Changes in Temperature Sensitivity and Activation Energy of Soil Organic Matter Decomposition in Different Qinghai-Tibet Plateau Grasslands |
title_full_unstemmed | Changes in Temperature Sensitivity and Activation Energy of Soil Organic Matter Decomposition in Different Qinghai-Tibet Plateau Grasslands |
title_short | Changes in Temperature Sensitivity and Activation Energy of Soil Organic Matter Decomposition in Different Qinghai-Tibet Plateau Grasslands |
title_sort | changes in temperature sensitivity and activation energy of soil organic matter decomposition in different qinghai-tibet plateau grasslands |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4503348/ https://www.ncbi.nlm.nih.gov/pubmed/26176705 http://dx.doi.org/10.1371/journal.pone.0132795 |
work_keys_str_mv | AT lijie changesintemperaturesensitivityandactivationenergyofsoilorganicmatterdecompositionindifferentqinghaitibetplateaugrasslands AT henianpeng changesintemperaturesensitivityandactivationenergyofsoilorganicmatterdecompositionindifferentqinghaitibetplateaugrasslands AT weixuehong changesintemperaturesensitivityandactivationenergyofsoilorganicmatterdecompositionindifferentqinghaitibetplateaugrasslands AT gaoyang changesintemperaturesensitivityandactivationenergyofsoilorganicmatterdecompositionindifferentqinghaitibetplateaugrasslands AT zuoyao changesintemperaturesensitivityandactivationenergyofsoilorganicmatterdecompositionindifferentqinghaitibetplateaugrasslands |