| 深圳湾红树林老鼠簕灌丛的光合固碳及其影响因子 |
| Vegetative Carbon Accumulation and the Environmental Factors of Acanthus ilicifolius Shrubs in Shenzhen Mangroves of China |
| 投稿时间：2019-10-11 修订日期：2019-11-20 |
| DOI： |
| 中文关键词: 红树林 碳库 生物量 光合作用 光照强度 |
| 英文关键词:Mangrove Carbon stock Biomass Photosynthesis Light intensity |
| 基金项目:本研究得到深圳市城管局科研项目(201801)、广东省林业科技创新项目(2017KJCX038)和国家林业局林业生态站监测运行补助项目(2019132075)共同资助 |
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| 中文摘要: |
| 红树林(Mangroves)是生长在热带和亚热带海岸潮间带的木本植物群落。老鼠簕(Acanthus ilicifolius)是我国红树林林下灌丛的主要物种,是林下植被碳库的主要构成。本研究选取深圳福田红树林区的林下、林窗、林缘和光滩等不同生境下,自然生长的老鼠簕植株,测定植株生物量和光合特性等相关指标。研究表明林窗生境下的老鼠簕植株的光合能力、光合固碳速率和地上生物量累积均达到最大；林下生境最不利于老鼠簕植株固碳；光滩的老鼠簕植株具有较高的地下生物量累积,但由于其蒸腾速率高、水分利用率低下,其固碳较低。光照强度是决定不同生境老鼠簕植株固碳的关键因子。在未来我国红树林造林中,老鼠簕可作为林下植被构建,以提高红树林生物量总碳库；但最适宜老鼠簕固碳的光照约为40-80%。该结果将为红树林造林实践中的物种选择和林分构建提供理论参考。 |
| 英文摘要: |
| Mangroves are woody communities naturally distributed along the coastal line of tropical and subtropical regions. As the major under forest species in mangroves of China, Acanthus ilicifolius is one of the components of vegetative carbon stock in mangroves. This study aimed to discover the growth, leaf assimilation traits of Acanthus ilicifolius in different environment in natural mangroves, which were two kinds of environments under dense canopy of Kandelia obovata forests and Avicennia marina forests, forest gaps, forest edges and the mudflats. The results showed that leaf assimilation capacities, assimilation rates and the aboveground biomass reached the maximum in forest gaps and forest edges among the five environments. While the two understory environments were not suitable for Acanthus ilicifolius carbon accumulation. Although Acanthus ilicifolius in mudflats maintained the highest belowground biomass, while the highest transpiration rates and the lowest water use efficiency depressed the total biomass. Light intensity was the key among all environmental factors that contributing to carbon assimilation of Acanthus ilicifolius vegetation. In future mangrove reforestation, Acanthus ilicifolius vegetation could act as understory carbon stock and contribute to total vegetative carbon stocks of mangroves. However, 40-80% of light intensity would be the most suitable for Acanthus ilicifolius carbon assimilation. These results provided a reference for species selection and forest structure establishment in mangrove afforestation in China. |
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