Evaluation of Multiple Spring Phenological Indicators of Yearly GPP and NEP at Three Canadian Forest Sites
Phenological shifts in events such as flowering and bud break are important indicators of ecosystem processes, and are therefore of particular significance for carbon (C) cycle research. Using long-term flux data from three contrasting plant functional type (evergreen and deciduous) boreal forest si...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2014-03-01
|
| Series: | Remote Sensing |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2072-4292/6/3/1991 |
| _version_ | 1798024598119251968 |
|---|---|
| author | Qian Wang Lifu Zhang Taixia Wu Yi Cen Changping Huang Qingxi Tong |
| author_facet | Qian Wang Lifu Zhang Taixia Wu Yi Cen Changping Huang Qingxi Tong |
| author_sort | Qian Wang |
| collection | DOAJ |
| description | Phenological shifts in events such as flowering and bud break are important indicators of ecosystem processes, and are therefore of particular significance for carbon (C) cycle research. Using long-term flux data from three contrasting plant functional type (evergreen and deciduous) boreal forest sites, we evaluated and compared the responses of annual C fluxes to multiple spring phenological indicators, including the C-uptake period onset (CUP onset), spring temperature (average value from March to May), and satellite-derived enhanced vegetation index (EVI) (average value from March to May). We found that the CUP onset was negatively correlated with annual gross primary production (GPP) for all three sites, but that its predictive strength for annual net ecosystem production (NEP) differed substantially among plant functional types. Spring temperature demonstrated particularly good potential for predicting both annual GPP and NEP for the evergreen sites, but not for the deciduous site. Spring EVI was demonstrated to have potential for predicting annual NEP for all sites. However, both plant functional types confounded the correlation of annual NEP with annual GPP. Although none of these phenological indicators provided consistent insight into annual C fluxes, using various currently available datasets our results remain potentially useful for the assessment of forest C cycling with future climate change. Previous analyses using only a single phenological metric should be considered with caution. |
| first_indexed | 2024-04-11T18:05:09Z |
| format | Article |
| id | doaj.art-4eae055dbde04ae38f67f3166a633b4e |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-04-11T18:05:09Z |
| publishDate | 2014-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-4eae055dbde04ae38f67f3166a633b4e2022-12-22T04:10:21ZengMDPI AGRemote Sensing2072-42922014-03-01631991200710.3390/rs6031991rs6031991Evaluation of Multiple Spring Phenological Indicators of Yearly GPP and NEP at Three Canadian Forest SitesQian Wang0Lifu Zhang1Taixia Wu2Yi Cen3Changping Huang4Qingxi Tong5The State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, ChinaThe State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, ChinaThe State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, ChinaThe State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, ChinaThe State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, ChinaThe State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, ChinaPhenological shifts in events such as flowering and bud break are important indicators of ecosystem processes, and are therefore of particular significance for carbon (C) cycle research. Using long-term flux data from three contrasting plant functional type (evergreen and deciduous) boreal forest sites, we evaluated and compared the responses of annual C fluxes to multiple spring phenological indicators, including the C-uptake period onset (CUP onset), spring temperature (average value from March to May), and satellite-derived enhanced vegetation index (EVI) (average value from March to May). We found that the CUP onset was negatively correlated with annual gross primary production (GPP) for all three sites, but that its predictive strength for annual net ecosystem production (NEP) differed substantially among plant functional types. Spring temperature demonstrated particularly good potential for predicting both annual GPP and NEP for the evergreen sites, but not for the deciduous site. Spring EVI was demonstrated to have potential for predicting annual NEP for all sites. However, both plant functional types confounded the correlation of annual NEP with annual GPP. Although none of these phenological indicators provided consistent insight into annual C fluxes, using various currently available datasets our results remain potentially useful for the assessment of forest C cycling with future climate change. Previous analyses using only a single phenological metric should be considered with caution.http://www.mdpi.com/2072-4292/6/3/1991phenologyEVIspring temperaturecarbon uptake periodremote sensingforest |
| spellingShingle | Qian Wang Lifu Zhang Taixia Wu Yi Cen Changping Huang Qingxi Tong Evaluation of Multiple Spring Phenological Indicators of Yearly GPP and NEP at Three Canadian Forest Sites Remote Sensing phenology EVI spring temperature carbon uptake period remote sensing forest |
| title | Evaluation of Multiple Spring Phenological Indicators of Yearly GPP and NEP at Three Canadian Forest Sites |
| title_full | Evaluation of Multiple Spring Phenological Indicators of Yearly GPP and NEP at Three Canadian Forest Sites |
| title_fullStr | Evaluation of Multiple Spring Phenological Indicators of Yearly GPP and NEP at Three Canadian Forest Sites |
| title_full_unstemmed | Evaluation of Multiple Spring Phenological Indicators of Yearly GPP and NEP at Three Canadian Forest Sites |
| title_short | Evaluation of Multiple Spring Phenological Indicators of Yearly GPP and NEP at Three Canadian Forest Sites |
| title_sort | evaluation of multiple spring phenological indicators of yearly gpp and nep at three canadian forest sites |
| topic | phenology EVI spring temperature carbon uptake period remote sensing forest |
| url | http://www.mdpi.com/2072-4292/6/3/1991 |
| work_keys_str_mv | AT qianwang evaluationofmultiplespringphenologicalindicatorsofyearlygppandnepatthreecanadianforestsites AT lifuzhang evaluationofmultiplespringphenologicalindicatorsofyearlygppandnepatthreecanadianforestsites AT taixiawu evaluationofmultiplespringphenologicalindicatorsofyearlygppandnepatthreecanadianforestsites AT yicen evaluationofmultiplespringphenologicalindicatorsofyearlygppandnepatthreecanadianforestsites AT changpinghuang evaluationofmultiplespringphenologicalindicatorsofyearlygppandnepatthreecanadianforestsites AT qingxitong evaluationofmultiplespringphenologicalindicatorsofyearlygppandnepatthreecanadianforestsites |