{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T17:44:30Z","timestamp":1770745470027,"version":"3.49.0"},"reference-count":59,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T00:00:00Z","timestamp":1633910400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Special Project on National Science and Technology Basic Resources Investigation of China","award":["2021FY100704"],"award-info":[{"award-number":["2021FY100704"]}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["31600368"],"award-info":[{"award-number":["31600368"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2017YFC0506102"],"award-info":[{"award-number":["2017YFC0506102"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Natural Science Foundation of Fujian Province, China","award":["2020J01112079"],"award-info":[{"award-number":["2020J01112079"]}]},{"name":"Youth Innovation Foundation of Xiamen, China","award":["3502Z20206038"],"award-info":[{"award-number":["3502Z20206038"]}]},{"DOI":"10.13039\/501100012226","name":"Fundamental Research Funds for the Central Universities of China","doi-asserted-by":"publisher","award":["20720210075"],"award-info":[{"award-number":["20720210075"]}],"id":[{"id":"10.13039\/501100012226","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The photochemical reflectance index (PRI) has been often used as a physiology-based remote sensing indicator of ecosystem carbon fluxes. However, the assessments of PRI in tracking long-term carbon fluxes with climatic anomalies in mangroves are very limited. In this study, four-year (2017\u20132020) continuous time series measurements from tower-based eddy covariance and spectral systems in a subtropical mangrove were used to explore the ability of PRI in tracking the response of mangrove carbon fluxes to climate fluctuations and drought stress. The results showed that the temporal dynamics of daily PRI and carbon fluxes shared similar variation patterns over the study period, experiencing simultaneously decreasing trends under drought stress. Compared with the first three years, annual mean values of NEE in 2020 decreased by 10.7% and PRI decreased by 29.0%, correspondingly. PRI and carbon fluxes were significantly correlated across diurnal, seasonal, and annual time scales with better fitness under drought stress. Dark-state PRI (PRI0), the constitutive component of PRI variation due to seasonally changing pigment pool size, showed similar temporal variation as PRI in response to drought stress, while delta PRI (\u0394PRI), the facultative component of PRI variation due to diurnal xanthophyll cycle, showed no response to drought stress. This study confirms the ability of PRI to track temporal dynamics of mangrove carbon fluxes on both short-term and long-term scales, with the temporal variation of PRI largely affected by the long-term constitutive pigment pool size. This study highlights the potential of PRI to serve as an early and readily detectable indicator to track the response of the mangrove carbon cycle to climatic anomalies such as drought stress.<\/jats:p>","DOI":"10.3390\/rs13204053","type":"journal-article","created":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T21:45:32Z","timestamp":1633988732000},"page":"4053","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Response of Mangrove Carbon Fluxes to Drought Stress Detected by Photochemical Reflectance Index"],"prefix":"10.3390","volume":"13","author":[{"given":"Yaqing","family":"Lu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Marine Environment Science, Xiamen University, Xiamen 361102, China"},{"name":"Key Laboratory of the Coastal and Wetland Ecosystems (Ministry of Education), Xiamen University, Xiamen 361102, China"},{"name":"College of the Environment and Ecology, Xiamen University, Xiamen 361102, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0324-9042","authenticated-orcid":false,"given":"Xudong","family":"Zhu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Marine Environment Science, Xiamen University, Xiamen 361102, China"},{"name":"Key Laboratory of the Coastal and Wetland Ecosystems (Ministry of Education), Xiamen University, Xiamen 361102, China"},{"name":"College of the Environment and Ecology, Xiamen University, Xiamen 361102, China"},{"name":"Coastal and Ocean Management Institute, Xiamen University, Xiamen 361102, China"},{"name":"Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China"}]}],"member":"1968","published-online":{"date-parts":[[2021,10,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"383","DOI":"10.1016\/j.margeo.2004.04.016","article-title":"Sediment accumulation and organic material flux in a managed mangrove ecosystem: Estimates of land\u2013ocean\u2013atmosphere exchange in peninsular Malaysia","volume":"208","author":"Alongi","year":"2004","journal-title":"Mar. 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