北部湾典型红树林岛群生态系统的结构特征与碳储量研究（英文）

通过研究北部湾海域龟仙岛和背风墩红树林岛群生态系统的结构特征与碳储量，为红树林保护及生态补偿提供科学依据。本文以无人机遥感影像和样地调查为数据源，采用面向对象的多尺度分割算法提取红树林群落类型信息，借助单因素方差分析、优势种分析、多样性分析等方法来分析红树林群落的结构特征，基于红树植物的异速生长方程，得出了不同海岛红树林生态系统碳密度和碳储量。(1)龟仙岛和背风墩岛屿群落约 27.10 ha，其中，红树林面积约 11.20 ha，占岛群总面积的 41.32%，红树林群落广泛分布于岛屿周围的浅海滩涂区域；(2)主要群落类型有桐花树群落、秋茄+桐花树群落、白骨壤+桐花树群落和白骨壤群落，物种多样性指数较低；(3)在红树林的生物量中，白骨壤最高(18.52 kg 株^–1)，秋茄次之(7.84 kg 株^–1)，桐花树最小(3.85 kg 株^–1);(4)红树林碳密度差异显著，秋茄的碳密度最高(148.03 t ha^–1)，其次是白骨壤(104.79 t ha^–1)，桐花树最小(9...

Characteristics and Carbon Storage of a Typical Mangrove Island Ecosystem in Beibu Gulf,South China Sea

By studying the structural characteristics and carbon storage of the mangrove island ecosystem in the Beibu Gulf, this study provides a scientific basis for mangrove ecological compensation in the coastal areas of Guangxi, South China Sea. On the basis of the unmanned aerial vehicle remote sensing images and a sample plot survey, the object-oriented multi-scale segmentation algorithm is used to extract the mangrove community type information, and one-way analysis of variance is conducted to analyse the structural characteristics of the mangrove community. The carbon storage and carbon density of different mangrove ecosystems were obtained based on the allometric growth equation of mangrove plants. The analysis yielded four main results. (1) The island group covers about 27.10 ha, 41.32% (11.20 ha) of which represents mangrove areas. The mangrove forest is widely distributed in the tidal flats around the islands. (2) The main mangrove types were Aegiceras corniculatum, Kandelia obovata + Aegiceras corniculatum, Avicennia marina + Aegiceras corniculatum and Avicennia marina communities. (3) Amongst the mangrove plants, Avicennia marina had the highest biomass (18.52 kg plant^-1), followed by Kandelia obovata (7.84 kg plant^-1) and Aegiceras corniculatum (3.85 kg plant^-1). (4) The mangrove carbon density difference was significant. Kandelia obovata had the highest carbon density (148.03 t ha^-1), followed by Avicennia marina (104.79 t ha^-1) and Aegiceras corniculatum (99.24 t ha^-1). The carbon storage of the mangrove island ecosystem was 1194.70 t, which was higher than in other areas with the same latitude. The carbon sequestration capacity of the mangrove was relatively strong.