Spatiotemporal dynamics of grassland aboveground biomass on the Qinghai-Tibet Plateau based on validated MODIS NDVI

Abstract Spatiotemporal dynamics of aboveground biomass (AGB) is a fundamental problem for grassland environmental management on the Qinghai-Tibet Plateau (QTP). Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) data can feasibly be used to estimate...

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Autores principales:	Shiliang Liu, Fangyan Cheng, Shikui Dong, Haidi Zhao, Xiaoyun Hou, Xue Wu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/20ec27d613b4425bb878d53ae69d91a7
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spelling	oai:doaj.org-article:20ec27d613b4425bb878d53ae69d91a72021-12-02T12:32:42ZSpatiotemporal dynamics of grassland aboveground biomass on the Qinghai-Tibet Plateau based on validated MODIS NDVI10.1038/s41598-017-04038-42045-2322https://doaj.org/article/20ec27d613b4425bb878d53ae69d91a72017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04038-4https://doaj.org/toc/2045-2322Abstract Spatiotemporal dynamics of aboveground biomass (AGB) is a fundamental problem for grassland environmental management on the Qinghai-Tibet Plateau (QTP). Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) data can feasibly be used to estimate AGB at large scales, and their precise validation is necessary to utilize them effectively. In our study, the clip-harvest method was used at 64 plots in QTP grasslands to obtain actual AGB values, and a handheld hyperspectral spectrometer was used to calculate field-measured NDVI to validate MODIS NDVI. Based on the models between NDVI and AGB, AGB dynamics trends during 2000–2012 were analyzed. The results showed that the AGB in QTP grasslands increased during the study period, with 70% of the grasslands undergoing increases mainly in the Qinghai Province. Also, the meadow showed a larger increasing trend than steppe. Future AGB dynamic trends were also investigated using a combined analysis of the slope values and the Hurst exponent. The results showed high sustainability of AGB dynamics trends after the study period. Predictions indicate 60% of the steppe and meadow grasslands would continue to increase in AGB, while 25% of the grasslands would remain in degradation, with most of them distributing in Tibet.Shiliang LiuFangyan ChengShikui DongHaidi ZhaoXiaoyun HouXue WuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shiliang Liu Fangyan Cheng Shikui Dong Haidi Zhao Xiaoyun Hou Xue Wu Spatiotemporal dynamics of grassland aboveground biomass on the Qinghai-Tibet Plateau based on validated MODIS NDVI
description	Abstract Spatiotemporal dynamics of aboveground biomass (AGB) is a fundamental problem for grassland environmental management on the Qinghai-Tibet Plateau (QTP). Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) data can feasibly be used to estimate AGB at large scales, and their precise validation is necessary to utilize them effectively. In our study, the clip-harvest method was used at 64 plots in QTP grasslands to obtain actual AGB values, and a handheld hyperspectral spectrometer was used to calculate field-measured NDVI to validate MODIS NDVI. Based on the models between NDVI and AGB, AGB dynamics trends during 2000–2012 were analyzed. The results showed that the AGB in QTP grasslands increased during the study period, with 70% of the grasslands undergoing increases mainly in the Qinghai Province. Also, the meadow showed a larger increasing trend than steppe. Future AGB dynamic trends were also investigated using a combined analysis of the slope values and the Hurst exponent. The results showed high sustainability of AGB dynamics trends after the study period. Predictions indicate 60% of the steppe and meadow grasslands would continue to increase in AGB, while 25% of the grasslands would remain in degradation, with most of them distributing in Tibet.
format	article
author	Shiliang Liu Fangyan Cheng Shikui Dong Haidi Zhao Xiaoyun Hou Xue Wu
author_facet	Shiliang Liu Fangyan Cheng Shikui Dong Haidi Zhao Xiaoyun Hou Xue Wu
author_sort	Shiliang Liu
title	Spatiotemporal dynamics of grassland aboveground biomass on the Qinghai-Tibet Plateau based on validated MODIS NDVI
title_short	Spatiotemporal dynamics of grassland aboveground biomass on the Qinghai-Tibet Plateau based on validated MODIS NDVI
title_full	Spatiotemporal dynamics of grassland aboveground biomass on the Qinghai-Tibet Plateau based on validated MODIS NDVI
title_fullStr	Spatiotemporal dynamics of grassland aboveground biomass on the Qinghai-Tibet Plateau based on validated MODIS NDVI
title_full_unstemmed	Spatiotemporal dynamics of grassland aboveground biomass on the Qinghai-Tibet Plateau based on validated MODIS NDVI
title_sort	spatiotemporal dynamics of grassland aboveground biomass on the qinghai-tibet plateau based on validated modis ndvi
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/20ec27d613b4425bb878d53ae69d91a7
work_keys_str_mv	AT shiliangliu spatiotemporaldynamicsofgrasslandabovegroundbiomassontheqinghaitibetplateaubasedonvalidatedmodisndvi AT fangyancheng spatiotemporaldynamicsofgrasslandabovegroundbiomassontheqinghaitibetplateaubasedonvalidatedmodisndvi AT shikuidong spatiotemporaldynamicsofgrasslandabovegroundbiomassontheqinghaitibetplateaubasedonvalidatedmodisndvi AT haidizhao spatiotemporaldynamicsofgrasslandabovegroundbiomassontheqinghaitibetplateaubasedonvalidatedmodisndvi AT xiaoyunhou spatiotemporaldynamicsofgrasslandabovegroundbiomassontheqinghaitibetplateaubasedonvalidatedmodisndvi AT xuewu spatiotemporaldynamicsofgrasslandabovegroundbiomassontheqinghaitibetplateaubasedonvalidatedmodisndvi
_version_	1718393966303379456

Spatiotemporal dynamics of grassland aboveground biomass on the Qinghai-Tibet Plateau based on validated MODIS NDVI

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