Conservation gap analysis of coastal blue carbon ecosystems: Taking Guangdong and Guangxi as examples

doi:10.3969-j.issn.1001-909X.2023.01.009

Abstract

Abstract:

Mangroves, salt marshes, and seagrass beds are known as the three major coastal blue carbon ecosystems (CBCEs), which play important roles in marine biodiversity maintenance, water purification, nutrient recycling, carbon sequestration and storage. Guangdong Province and Guangxi Zhuang Autonomous Region in China, where the CBCEs are widely distributed, were selected as the research areas, to investigate the spatial relationship between CBCEs and the marine ecological redlines (MERs). The CBCE conservation gap was analyzed, and the recommended priority conservation areas outside the MERs were proposed. The CBCE distribution data obtained from the satellite images in 2019, combined with field survey and UAV remote sensing data collected during 2020 and 2021 showed that the CBCEs in Guangdong totaled 14 481.39 hm² (mangroves 11 928.87 hm², salt marshes 1 258.00 hm², seagrass beds 1 294.52 hm²), whereas the CBCEs in Guangxi totaled 11 751.30 hm² (mangroves 10 171.70 hm², salt marshes 1 450.36 hm², seagrass beds 129.24 hm²). 62.13% of the CBCEs in Guangdong and 59.88% in Guangxi were covered by the MERs. The distribution areas and protection ratios of mangroves and seagrass beds in Guangdong were both larger than those in Guangxi, while the distribution area and protection ratio of salt marshes in Guangxi were larger than that in Guangdong. As to the 3 types of CBCEs in Guangdong, 62.13% of the mangroves, 38.16% of the salt marshes and 85.41% of the seagrass beds were under protection. For the CBCEs in Guangxi, 61.44% of the mangroves, 49.58% of the salt marshes and 52.99% of the seagrass beds were protected. This research suggests the coast from Rongmujiang Bay to Maowei Sea, the areas of Tieshan Bay, Leizhou Bay, Zhelin Bay and other related locations as the recommended priority conservation areas outside the MERs.

Key words: blue carbon ecosystems, marine ecological redlines, mangrove, seagrass bed, salt marsh

CLC Number:

X171.1

DONG Di, HUANG Huamei, GAO Qing, CHEN Mianrun, YANG Xi. Conservation gap analysis of coastal blue carbon ecosystems: Taking Guangdong and Guangxi as examples[J]. Journal of Marine Sciences, 2023, 41(1): 110-120.

Figures/Tables 5

Fig.1 The distribution of coastal blue carbon ecosystems (CBCEs) in Guangdong and Guangxi

Tab.1 Areas of the CBCEs inside and outside of the marine ecological redlines in Guangdong and Guangxi

生态系统类型	区域	海洋生态红线内面积/ hm²		海洋生态红线外面积/ hm²	总面积/ hm²	海洋生态红线内面积占省/区的对应生态系统总面积的比例/%
生态系统类型	区域	禁止类	限制类	海洋生态红线外面积/ hm²	总面积/ hm²	海洋生态红线内面积占省/区的对应生态系统总面积的比例/%
红树林	广东	1 110.79	6 300.08	4 518.00	11 928.87	62.13
红树林	广西	1 764.41	4 484.92	3 922.37	10 171.70	61.44
盐沼^①	广东	0(0)	480.11(59.87)	777.89(268.08)	1 258.00(327.95)	38.16
盐沼^①	广西	380.13(380.13)	339.02(329.28)	731.21(602.60)	1 450.36(1 312.01)	49.58
海草床	广东	0	1 105.69	188.83	1 294.52	85.41
海草床	广西	32.96	35.52	60.77	129.24	52.99

Fig.2 The protection status of three kinds of CBCEs in Guangdong and Guangxi

Fig.3 The occupancy area of the unprotected CBCE in the coastal zone (AOO value refers to the area of CBCEs (except Spartina alterniflora) that are not inside the MERs within each 10 km×10 km grid, the darker color refers to the higher AOO value.)

Fig.4 The spatial distribution of species number of the unprotected CBCEs (3 different colors represent the species number of the CBCEs (except Spartina alterniflora) that are outside of the MERs in each 10 km×10 km grid.)

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