Spatiotemporal dynamics of vegetation net ecosystem productivity and its response to drought in Northwest China
Net ecosystem productivity (NEP) quantifies magnitude of the terrestrial vegetation carbon sinks. Drought is one of the most important stressors affecting vegetation NEP. At present, the spatiotemporal dynamics of vegetation NEP in drought-prone of Northwest China (NWC) lack discussion under differe...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2023-12-01
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| Series: | GIScience & Remote Sensing |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/15481603.2023.2194597 |
| _version_ | 1827811736636358656 |
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| author | Shengpeng Cao Yi He Lifeng Zhang Qiang Sun Yali Zhang Hongzhe Li Xiao Wei Yaoxiang Liu |
| author_facet | Shengpeng Cao Yi He Lifeng Zhang Qiang Sun Yali Zhang Hongzhe Li Xiao Wei Yaoxiang Liu |
| author_sort | Shengpeng Cao |
| collection | DOAJ |
| description | Net ecosystem productivity (NEP) quantifies magnitude of the terrestrial vegetation carbon sinks. Drought is one of the most important stressors affecting vegetation NEP. At present, the spatiotemporal dynamics of vegetation NEP in drought-prone of Northwest China (NWC) lack discussion under different climatic zones and land cover types, and the response of vegetation NEP to drought remains unclear. Hence, we estimated the vegetation NEP in NWC using ground and remote sensing data and quantified the spatiotemporal differentiation of NEP under different climatic zones and land cover types. The drought fluorescence monitoring index (DFMI) was developed to examine the relationship between vegetation NEP and drought response based on the solar-induced chlorophyll fluorescence (SIF) data. Our results suggested that vegetation carbon sinks increased significantly at 7.09 g C m−2 yr−1 in NWC during 2000–2019, mainly in northern Shaanxi, eastern and southern Gansu, and southern Ningxia. NEP showed increasing trends under different climatic zones and land cover types, but there were differences in carbon sink capacity. The strongest carbon sink capacity was in humid regions and forests, while the weakest was in arid regions and grasslands. The vegetation carbon sinks showed a non-linear relationship with the drought degree reflecting multiple trend differences, especially in forests and grasslands. The response to drought was faster and more significant in semi-arid and semi-humid transition zones and extreme humid regions when vegetation carbon sinks decreased. DFMI was a good indicator to monitor drought conditions in NWC. NEP and DFMI were an 8–20-month periodic positive correlation and showed a high correlation with high–high and low–low clustering spatially. Drought significantly weakened vegetation carbon sinks in NWC. This study emphasizes the demand to rapidly identify climatic conditions that lead to decrease significantly in vegetation carbon sinks and to formulate adaptation strategies aimed at reducing drought risk under global warming. |
| first_indexed | 2024-03-11T23:08:49Z |
| format | Article |
| id | doaj.art-d5a749e8429d4faaad74b73b2fc69a14 |
| institution | Directory Open Access Journal |
| issn | 1548-1603 1943-7226 |
| language | English |
| last_indexed | 2024-03-11T23:08:49Z |
| publishDate | 2023-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | GIScience & Remote Sensing |
| spelling | doaj.art-d5a749e8429d4faaad74b73b2fc69a142023-09-21T12:43:09ZengTaylor & Francis GroupGIScience & Remote Sensing1548-16031943-72262023-12-0160110.1080/15481603.2023.21945972194597Spatiotemporal dynamics of vegetation net ecosystem productivity and its response to drought in Northwest ChinaShengpeng Cao0Yi He1Lifeng Zhang2Qiang Sun3Yali Zhang4Hongzhe Li5Xiao Wei6Yaoxiang Liu7Lanzhou Jiaotong UniversityLanzhou Jiaotong UniversityLanzhou Jiaotong UniversityLanzhou Jiaotong UniversityLanzhou Jiaotong UniversityLanzhou Jiaotong UniversityLanzhou Jiaotong UniversityLanzhou Jiaotong UniversityNet ecosystem productivity (NEP) quantifies magnitude of the terrestrial vegetation carbon sinks. Drought is one of the most important stressors affecting vegetation NEP. At present, the spatiotemporal dynamics of vegetation NEP in drought-prone of Northwest China (NWC) lack discussion under different climatic zones and land cover types, and the response of vegetation NEP to drought remains unclear. Hence, we estimated the vegetation NEP in NWC using ground and remote sensing data and quantified the spatiotemporal differentiation of NEP under different climatic zones and land cover types. The drought fluorescence monitoring index (DFMI) was developed to examine the relationship between vegetation NEP and drought response based on the solar-induced chlorophyll fluorescence (SIF) data. Our results suggested that vegetation carbon sinks increased significantly at 7.09 g C m−2 yr−1 in NWC during 2000–2019, mainly in northern Shaanxi, eastern and southern Gansu, and southern Ningxia. NEP showed increasing trends under different climatic zones and land cover types, but there were differences in carbon sink capacity. The strongest carbon sink capacity was in humid regions and forests, while the weakest was in arid regions and grasslands. The vegetation carbon sinks showed a non-linear relationship with the drought degree reflecting multiple trend differences, especially in forests and grasslands. The response to drought was faster and more significant in semi-arid and semi-humid transition zones and extreme humid regions when vegetation carbon sinks decreased. DFMI was a good indicator to monitor drought conditions in NWC. NEP and DFMI were an 8–20-month periodic positive correlation and showed a high correlation with high–high and low–low clustering spatially. Drought significantly weakened vegetation carbon sinks in NWC. This study emphasizes the demand to rapidly identify climatic conditions that lead to decrease significantly in vegetation carbon sinks and to formulate adaptation strategies aimed at reducing drought risk under global warming.http://dx.doi.org/10.1080/15481603.2023.2194597vegetation nepsifwavelet coherenceremote sensingnorthwest china |
| spellingShingle | Shengpeng Cao Yi He Lifeng Zhang Qiang Sun Yali Zhang Hongzhe Li Xiao Wei Yaoxiang Liu Spatiotemporal dynamics of vegetation net ecosystem productivity and its response to drought in Northwest China GIScience & Remote Sensing vegetation nep sif wavelet coherence remote sensing northwest china |
| title | Spatiotemporal dynamics of vegetation net ecosystem productivity and its response to drought in Northwest China |
| title_full | Spatiotemporal dynamics of vegetation net ecosystem productivity and its response to drought in Northwest China |
| title_fullStr | Spatiotemporal dynamics of vegetation net ecosystem productivity and its response to drought in Northwest China |
| title_full_unstemmed | Spatiotemporal dynamics of vegetation net ecosystem productivity and its response to drought in Northwest China |
| title_short | Spatiotemporal dynamics of vegetation net ecosystem productivity and its response to drought in Northwest China |
| title_sort | spatiotemporal dynamics of vegetation net ecosystem productivity and its response to drought in northwest china |
| topic | vegetation nep sif wavelet coherence remote sensing northwest china |
| url | http://dx.doi.org/10.1080/15481603.2023.2194597 |
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