Assessment of carbon sink potential and driving factors of island forests on national nature reserve

doi:10.3969-j.issn.1001-909X.2023.01.008

Abstract

Abstract:

The monitoring of carbon flux dynamics and assessment of carbon sink functions of island forest ecosystems are rarely reported due to their special geographical location and few data sources. In this study, the forest ecosystem of the Nanji Island was used as the research object, the carbon sink potential of island forests and their driving factors were assessed. Based on eddy correlation techniques, the temporal variation characteristics and driving factors of net ecosystem productivity (NEP), gross primary productivity (GPP), and ecosystem respiration (Reco) from 2020 to 2021 were explored. Results showed that the forest ecosystem of Nanji Island was carbon sink. Net CO₂ uptake in 2020 and 2021 were 516 g C·m^-2·a^-1 and 598 g C·m^-2·a^-1, Reco were 1 037 g C·m^-2·a^-1 and 1 646 g C·m^-2·a^-1, and GPP were 1 552 g C·m^-2·a^-1 and 2 244 g C·m^-2·a^-1, respectively. Total solar radiation (Rg), photosynthetically active radiation (PAR), net radiation (Rn) and sensible heat (H) were significantly and positively correlated with NEP and GPP (p≤0.001); air temperature (Tair) and soil temperature (Tsoil) were significantly and positively correlated with Reco(p≤0.001). The photosynthesis time of Nanji Island forest was longer than the carbon sink time on the daily scale. When Tair reached 10.05-27.76 ℃ and PAR reached 110.47-429.44 μmol·m^-2·s^-1, the photosynthesis intensity of island forest was higher than that of ecosystem respiration, which showed CO₂ absorption. The monitoring and assessment of carbon fluxes in the forest ecosystems of Nanji Island will provide an important theoretical support for the establishment of a dynamic monitoring and assessment management system for blue carbon in China.

Key words: eddy covariance, blue carbon, carbon flux, gross primary productivity, ecosystem respiration, island forest

CLC Number:

S718.5

WU Liangxu, ZOU Huimin, CHEN Wei, XU Minghai, CAI Houcai, CHEN Shuyi, LI Xianglan. Assessment of carbon sink potential and driving factors of island forests on national nature reserve[J]. Journal of Marine Sciences, 2023, 41(1): 96-109.

Figures/Tables 8

References 48

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研究区域	经纬度	蓝碳类型	NEP/(g C·m^-2·a^-1)	参考文献
广东高桥	21.56°N, 109.75°E	自然红树林	2 101.77	文献[32]
福建云霄	23.92°N, 117.41°E	自然红树林	540~1 233	文献[25]
广东雷州	20.00°N, 110.09°E	恢复红树林	1 105.15	文献[32]
香港米埔	22.49°N, 114.3°E	恢复红树林	690~890	文献[33]
广东高桥	21.56°N, 109.75°E	自然红树林	721	文献[34]
广东珠江口	22.60°N, 113.64°E	恢复红树林	175	文献[35]
中国		红树林	209~973	文献[10,13]
Florida Everglades, USA	25.364 6°N, 81.077 9°W	自然红树林	832~1 170	文献[36]
Sundarbans, India	20.82°N, 88.61°E	自然红树林	249	文献[37]
New Caledonia, France	20.937 5°N, 164.658 3°E	自然红树林	73.8	文献[38]
全球		红树林	649.89	文献[39]
上海长江口	31.213 0°N, 121.906 9°E	盐沼湿地	901	文献[40]
上海九段沙	31.213 0°N, 121.906 9°E	盐沼湿地	550~869	文献[41]
上海崇明东滩	31.516 6°—31.516 9°N, 121.960 0°—121.971 6°E	盐沼湿地	518~737	文献[42]
山东黄河三角洲	37.763 8°N, 118.973 3°E	盐沼湿地	237~261	文献[43]
中国		盐沼湿地	865	文献[12]
Massachusetts, USA	42.736°N, 70.828°W	盐沼湿地	256~337	文献[18]
全球		盐沼	522.17	文献[39]
全球		海草床	367~646	文献[11]
Tucson, USA Arizona, USA	32.416 6°N, 110.725 3°W	海岛森林	371~651	文献[5]
Vancouver Island, Canada	49.519 4°—49.872 2°N, 124.901 6°—125.335 0°W	海岛森林	359 ~635	文献[44]
浙江南麂岛	27.476°N, 121.053°E	海岛森林	516~598	本研究

研究区域	经纬度	蓝碳类型	NEP/(g C·m^-2·a^-1)	参考文献
广东高桥	21.56°N, 109.75°E	自然红树林	2 101.77	文献[32]
福建云霄	23.92°N, 117.41°E	自然红树林	540~1 233	文献[25]
广东雷州	20.00°N, 110.09°E	恢复红树林	1 105.15	文献[32]
香港米埔	22.49°N, 114.3°E	恢复红树林	690~890	文献[33]
广东高桥	21.56°N, 109.75°E	自然红树林	721	文献[34]
广东珠江口	22.60°N, 113.64°E	恢复红树林	175	文献[35]
中国		红树林	209~973	文献[10,13]
Florida Everglades, USA	25.364 6°N, 81.077 9°W	自然红树林	832~1 170	文献[36]
Sundarbans, India	20.82°N, 88.61°E	自然红树林	249	文献[37]
New Caledonia, France	20.937 5°N, 164.658 3°E	自然红树林	73.8	文献[38]
全球		红树林	649.89	文献[39]
上海长江口	31.213 0°N, 121.906 9°E	盐沼湿地	901	文献[40]
上海九段沙	31.213 0°N, 121.906 9°E	盐沼湿地	550~869	文献[41]
上海崇明东滩	31.516 6°—31.516 9°N, 121.960 0°—121.971 6°E	盐沼湿地	518~737	文献[42]
山东黄河三角洲	37.763 8°N, 118.973 3°E	盐沼湿地	237~261	文献[43]
中国		盐沼湿地	865	文献[12]
Massachusetts, USA	42.736°N, 70.828°W	盐沼湿地	256~337	文献[18]
全球		盐沼	522.17	文献[39]
全球		海草床	367~646	文献[11]
Tucson, USA Arizona, USA	32.416 6°N, 110.725 3°W	海岛森林	371~651	文献[5]
Vancouver Island, Canada	49.519 4°—49.872 2°N, 124.901 6°—125.335 0°W	海岛森林	359 ~635	文献[44]
浙江南麂岛	27.476°N, 121.053°E	海岛森林	516~598	本研究