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学者姓名：柯心然
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Abstract ：
In China, Dolichandrone spathacea is a rare and endangered semi-mangrove plant species with an extremely small population, naturally distributed only in Zhanjiang City and the east coast of Hainan Island. Despite conservation concerns, the population status of D. spathacea has received little scientific attention. In this study, we evaluated the current status of D. spathacea on Hainan Island, China, in order to propose sustainable conservation strategies for future ecological restoration of its natural population. D. spathacea on Hainan Island can be divided into four populations. All the D. spathacea populations present a state of overall dispersion, local concentration, and occasionally sporadic existence, and they exist in geographical isolation. The young, middle, and old D. spathacea plants account for 20.42%, 66.20%, and 13.38%, respectively, indicating that the D. spathacea population on Hainan Island is declining. Furthermore, instead of temporal structure, we used diameter at breast height (DBH) to establish a static life table, draw a population survival curve, and quantify the future development trend through population dynamic analysis and time-series prediction. These results suggest that the D. spathacea population in the Bamen Gulf (Wenchang) and Qingmei Harbor (Sanya) on Hainan Island is sensitive to external disturbances and possesses two main increases in mortality rate-namely, in its juvenile and mature stages-due to competition and anthropogenic interferences, which might be the most important reasons for its endangered status. Depending on the current conditions of the D. spathacea population, we should conserve and expand mature trees in situ, preserve their germplasm resources, rehabilitate their habitats to promote provenance restoration, and conduct artificial cultivation and spreading planting in order to realize the sustainable conservation and management of D. spathacea.
Keyword ：
diameter at breast height diameter at breast height Dolichandrone spathacea Dolichandrone spathacea mangrove mangrove natural population natural population population dynamic characteristics population dynamic characteristics static life table static life table
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| GB/T 7714 | Tian, Mi , Ke, Xinran , Li, Ming et al. Population Status of the Endangered Semi-Mangrove Dolichandrone spathacea on Hainan Island, China [J]. | FORESTS , 2024 , 15 (5) . |
| MLA | Tian, Mi et al. "Population Status of the Endangered Semi-Mangrove Dolichandrone spathacea on Hainan Island, China" . | FORESTS 15 . 5 (2024) . |
| APA | Tian, Mi , Ke, Xinran , Li, Ming , Deng, Kaixuan , Yang, Yong , Fang, Zanshan et al. Population Status of the Endangered Semi-Mangrove Dolichandrone spathacea on Hainan Island, China . | FORESTS , 2024 , 15 (5) . |
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Abstract ：
Tannins play vital roles in regulating ecological processes in mangrove forests. However, how tannins affect nitrogen (N) cycling and microbial metabolism in mangrove ecosystems remains largely unexplored. In this study, we hypothesized the types and amounts of tannins released into seawater and sediments during leaf litter decomposition differed among mangrove plant species, thus their effects on N and microbial metabolism also varied. The alterations of tannins, and environmental N and microbial metabolism during leaf litter decomposition of Kandelia obovata, Avicennia marina, and Sonneratia apetala were evaluated by a microcosm-simulated tidal system. Results showed that total polyphenols (TPs) in seawater treated with K. obovata litter were significantly higher than those in A. marina and S. apetala treatments, although the trends of TP changes elicited an initial increase followed by a decrease during decomposition. The dynamic changes in TPs reduced the seawater N concentrations in K. obovata treatment but not in A. marina and S. apetala treatments. The results of microbial metabolism analysis revealed that leaf litter significantly increased microbial metabolic activities and diversities. The types of carbon sources utilized by sediment microorganisms differed among treatments, with the microbes in S. apetala and A. marina litter used more varieties of amino acids, lipids and sugars than those in K. obovata treatment, probably due to the rich amount of hydrolysable tannins (HTs) in the first two species while the last species only contained ondensed tannins (CTs). CTs released from K. obovata leaf litter not only bound nitrogen-containing macromolecular compounds such as amino acids and proteins but also carbohydrates like polysaccharides, which decreased the supply of C and N to sediment microbiota. These results reveal that the release of mangrove tannins during leaf litter decomposition is one of the key factors driving N cycling, and microbial activities and diversities in mangrove wetlands.
Keyword ：
Hydrolysable and condensed tannins Hydrolysable and condensed tannins Leaf litter Leaf litter Mangrove Mangrove Microorganisms Microorganisms Nitrogen Nitrogen Sediment Sediment
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| GB/T 7714 | Lang, Tao , Ke, Xinran , Wei, Jian et al. Dynamics of tannin variations in mangrove leaf litter decomposition and their effects on environmental nitrogen and microbial activity [J]. | SCIENCE OF THE TOTAL ENVIRONMENT , 2023 , 908 . |
| MLA | Lang, Tao et al. "Dynamics of tannin variations in mangrove leaf litter decomposition and their effects on environmental nitrogen and microbial activity" . | SCIENCE OF THE TOTAL ENVIRONMENT 908 (2023) . |
| APA | Lang, Tao , Ke, Xinran , Wei, Jian , Hussain, Muzammil , Li, Mingdang , Gao, Changjun et al. Dynamics of tannin variations in mangrove leaf litter decomposition and their effects on environmental nitrogen and microbial activity . | SCIENCE OF THE TOTAL ENVIRONMENT , 2023 , 908 . |
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Laguncularia racemosa is widely planted in coastal mudflats as a pioneer species of mangrove afforestation in China; however, whether it exhibits invasiveness as an exotic species has been a topic of debate. In this study, we investigated the distribution, community structure, and population characteristics of L. racemosa on Hainan Island, China, to discuss its potential invasiveness. The results showed that Hainan Island has become an important distribution area for L. racemosa in China, covering a total area of 64.90 ha. In this investigation, a total of 11 true mangrove species, belonging to six families and 11 genera, were discovered in the L. racemosa community throughout Hainan Island. Furthermore, L. racemosa exhibited a strong adaptive range to seawater salinity and demonstrated a high capacity for natural dispersion. L. racemosa exhibited high importance values in the tree, shrub, and seedling layers of this artificial community, indicating its dominance and potential exclusion of other mangrove species. Over time, the importance values of L. racemosa in the tree and shrub layers initially decreased and then increased, while the opposite trend was observed in the seedling layer. Overall, the diversity indexes, including the Simpson index, Shannon-Wiener index, and Pielou community evenness index, were low in the planted L. racemosa forest on Hainan Island, suggesting a relatively simple species composition within the L. racemosa community. Additionally, based on the height levels of the L. racemosa population, we found that it mainly belonged to the first level, characterized by a large number of seedlings on Hainan Island. The number of L. racemosa seedlings gradually decreased in subsequent levels, and higher height levels of L. racemosa appeared with longer planting times, indicating a growing trend of potential invasiveness of L. racemosa on Hainan Island over an extended period. We suggest that the government should be able to list L. racemosa as an invasive species that can be harvested in the future. Based on this, this study provides fundamental data and theoretical references for the sustainable prevention, control, and management of the exotic species L. racemosa on Hainan Island, and also in other mangrove wetlands in China.
Keyword ：
biodiversity biodiversity invasive species invasive species mangrove forest mangrove forest natural dispersion natural dispersion
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| GB/T 7714 | Cheng, Cheng , Ke, Xinran , Lang, Tao et al. Current Status and Potential Invasiveness Evaluation of an Exotic Mangrove Species, Laguncularia racemosa (L.) CF Gaertn, on Hainan Island, China [J]. | FORESTS , 2023 , 14 (10) . |
| MLA | Cheng, Cheng et al. "Current Status and Potential Invasiveness Evaluation of an Exotic Mangrove Species, Laguncularia racemosa (L.) CF Gaertn, on Hainan Island, China" . | FORESTS 14 . 10 (2023) . |
| APA | Cheng, Cheng , Ke, Xinran , Lang, Tao , Zhong, Cairong , Lv, Xiaobo , Zhang, Mengwen et al. Current Status and Potential Invasiveness Evaluation of an Exotic Mangrove Species, Laguncularia racemosa (L.) CF Gaertn, on Hainan Island, China . | FORESTS , 2023 , 14 (10) . |
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