Subjects: Biology >> Botany >> Applied botany submitted time 2024-05-15 Cooperative journals: 《广西植物》
Li Jinghan
Zhang Shunwei
Yang Xiaobo
Li Donghai
Qi Chunlin
Huang Yao
Zhang Xiang
Hao Jiewei
Liang Caiqun
Zhu Zicheng
Jiang Yuexin
Wang Chongyang
HE Yiqi
Abstract： Based on the ‘National Key Protected Wild Plants List’ and related data in 2021, combined with field investigation, the ‘National Key Protected Wild Plants List of Hainan Province’ was integrated, and its composition and floristic characteristics were analyzed. The results were as follows: (1) Among the national key protected wild plants, the original Cycas changjiangensis, C. hainanensis, C. lingshuigensis and C. taiwaniana were incorporated into C. taiwaniana; compared with the National Key Protected Wild Plant List in 1999, the original Semiliquidambar cathayensis and Amphicarpaea linearis were removed from the protection category, and Bretschneidera sinensis was degraded from the Category I protection to the Category II protection.127 species of national key protected wild plants were added, and a total of 173 species ( including varieties ) were added, belonging to 53 families and 83 genera, including 8 species of national Category I protected wild plants. There are 165 species of national Category II protected wild plants and 32 endemic species in Hainan Province, which belong to 4 groups. Among them, the angiosperm species are the most abundant, with 129 species. (2) Based on years of field investigation information and the results of this survey, Cycas rumphii, C. shanyagensis, Alsophila costularis and Paphiopedilum purpuratum have not been investigated. (3) The life forms of 173 protected plants were divided into 5 types, mainly phanerophytes ( 115 species ), followed by hemicryptophytes ( 34 species ) and hemicryptophytes ( 22 species ), and hemicryptophytes and cushion plants were the least ( 1 species ). (4) At the family level, Orchidaceae had the most species, including 47 species ( 27.17% ). At the genus level, Dendrobium has the largest number of species, including 21 species ( 12.14% ). (5) The floristic elements are complex and have obvious tropical characteristics. The families are mainly distributed in the pantropics and their variants. The genera are mainly distributed in tropical Asia and its variants. In summary, the tropical nature and unique phenomena of national key protected wild plants in Hainan Province are obvious, and there are many new protected species. Therefore, background investigation and dynamic monitoring should be carried out continuously, law enforcement should be strengthened, human factors should be reduced to interfere with and destroy habitats, and in-situ and ex-situ protection measures should be taken to strengthen protection and management.
Subjects: Biology >> Botany >> Applied botany submitted time 2024-05-07 Cooperative journals: 《广西植物》
ZHANG Shunwei
LI Jinghan
YANG Xiaobo
LI Donghai
WANG Chongyang
ZHU Zicheng
JIANG Yuexin
HE Yiqi
Shang Naiyan
DU Chunyan
LIU Chang
ZHONG Iishuang
SU Xin
Abstract： In order to reveal the distribution and habitat characteristics of national key protected wild plants in Hainan Province, this paper selected national key protected wild plants, based on the 2021 edition of the List of national key protected wild plants th rough field surveys, researched the distribution of national key protected wild plants in Hainan Province and their type of vegetation. The results were as follows : (1) T here were a total of 53 families, 83 genera and 173 species of national key protected wild plants in Hainan Province, ranking fifth in the number of species and first in the density of species in China (based on the current data base of wild). (2) A ll 19 counties and municipalities in Hainan Province had national key protected wild plants, and the number of species in the central and the south of the cities/counties is much larger than that in the north, with the largest species richness in Changjiang Li Autonomous County (75 species), and the highest species density in Lingshui Li Autonomou s County (0.60 4 5 ind.•km 2 ); T he number of species of national key protected wild plants was distributed in nine gradients (with a gradient value of 200 m) from 0 to 1 867 m above sea level, and there were a trend of slightly decreased very rapidly increa sed slowly decreased, with the highest number of species distributed in the elevation band. When 800 m Altitude < 1 000 m and 1 000 m Altitude < 1 200 m, there was 81 national key protected wild plant species, while only 9 species in the segment 1 600 m Altitude < 1 867 m (3) The habitats of national key protected wild plants in Hainan Province were complex ed , rel ied on a total of 11 vegetation types, among which the lowland rainforest ha d the highest species richness (114 species), followed by mountain rainforest (105 species) and the semi mangrove forest (1 species); and the most severely externally disturbed is freshwater wet grassland, followed by lowland rainforest, and the least is m ontane cloud forest. The results of the study can provide scientific reference for the conservation and utilization of national key protected wild p lants in Hainan Province.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-05-21 Cooperative journals: 《广西植物》
Abstract： Altitude is the key factor affecting species diversity pattern. In order to explore the altitude distribution pattern of species diversity in tropical natural forest in Diaoluo Mountain, vegetation survey was conducted in 6 tropical natural forest plots from 245 to 1 130 m. The species diversity and community characteristics of tropical natural forest along the altitude of Diaoluo Mountain were analyzed from the aspects of species composition, species diversity, flora composition and leaf characteristics. The results were as follows: (1)With the increase of altitude, the temperature decreased, the humidity increased and the human disturbance decreased. The species composition of tropical natural forest in Diaoluo Mountain and the diversity indexes of Margalef, Shannon-Wiener, Simpson, and Pielou all showed a pattern of first increase and then decrease. The middle-altitude community had the most suitable hydrothermal conditions and moderate human disturbance, so the α species diversity was the highest. (2)With the increase of altitude, the proportion of important value (IV) of dominant species decreased first and then increased, and the dominant species had obvious replacement phenomenon. The middle altitude community showed the transition nature of lowland rain forest and mountain rain forest. (3) The Sørensen community similarity coefficient between communities was significantly negatively correlated with altitude difference (P＜0.05). (4)The floristic composition was dominated by tropical elements and mainly distributed in tropical Asia (India-Malaysia). The proportion of tropical distribution was negatively correlated with altitude (P＜0.01), and the proportion of temperate distribution was positively correlated with altitude (P＜0.01). (5)The leaf characteristics showed the obvious indigenous characteristics in tropical regions mainly with mesophyll leaves, single leaves, leathery leaves and entire leaves. The proportion of microphyll leaves and single leaves was significantly positively correlated with altitude (P＜0.01), while the proportion of leathery leaves and non-entire leaves was not significantly correlated with altitude (P＞0.05). To sum up, the hydrothermal conditions and human disturbance degree of low altitude community in Diaoluo Mountain are quite different from those of high altitude community, which leads to the difference of species distribution and community characteristics, and reflects the characteristics of tropical plants adapting to their habitat conditions.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-05-21 Cooperative journals: 《广西植物》
Abstract： The terrain of Hainan is high in the middle and surrounded by low terrain on all sides. From the central mountains to the eastern coastal plains, due to the difference of natural conditions and historical human interference, the composition of flora has changed. In this study, quadrant sampling and line transect survey was carried out in Huishan Nature Reserve (in the middle and north of Hainan Island) to discover its composition. Then combined with the data of Wuzhishan Nature Reserve in the middle of Hainan Island (now part of the Tropical Rainforest National Park), Baishiling Nature Reserve in the eastern noncoastal area and Tongguling Nature Reserve in the northeastern coast, which investigated by our the team, compared and analyzed their flora composition characteristics. Try to explore the relationship between the change of flora composition and the secondary, area and altitude of Nature Reserve. The results were as follows: (1) There were 1 893 species, 1415 species, 634 species, and 913 wild seed plants in Wuzhishan, Huishan, Baishiling, and Tongguling Nature Reserves, the number of species in the central protected areas was significantly higher than that in the other 2 protected areas. (2)Species similarities between protected areas were significantly correlated with differences in altitude and area (P<0.05). (3) Four protected areas were dominated by tropical elements, but at the level of genera, Wuzhishan was dominated by tropical Asia, while others were dominated pan-tropical distribution; At the level of species, distribution of tropical Asia were the most in four reserves. In conclusion, from the central mountains to the eastern coastal plains, the more secondary, the lower the altitude, the less habitat types, and the number of plant species is poorer; At the same time, at the level of genera and species, the tropical composition were increased, while temperate, endemic and relict elements were decreased.
Subjects: Biology >> Botany >> Applied botany submitted time 2020-08-03 Cooperative journals: 《广西植物》
Abstract：鸭脚木（Schefflera octophylla）是海南文昌铜鼓岭国家级自然保护内滨海森林的优势种，也是海南其它地区热带森林常见伴生种。为了深入了解该区滨海森林内鸭脚木种群的生存现状、更新机制以及未来发展的动态变化特点，该研究通过对海南热带滨海森林 2.56 hm2 样地中鸭脚木种群的调查，以径级结构代替年龄结构，编制鸭脚木种群静态生命表，并结合种群动态量化指数、生存函数、时间序列预测模型等方法定量分析鸭脚木种群结构和数量动态变化。结果显示：（1）研究区域内记录鸭脚木数量 2814 株，按照径级大小共划分为 12 个龄级，龄级结构呈倒 J 字型，属于趋向稳定型种群。（2）该区鸭脚木的存活曲线趋于 Deevey-II 型，种群各径级的死亡率相接近。（3）鸭脚木种群的量化指数显示：Vpi=030.685>0，Vpi’=0.236>0，说明该种群现处增长阶段并且相对稳定。（4）据时间序列模型预测：鸭脚木种群在未来 3、6、9 年内各龄级的种群个体数量整体呈现增加的趋势。经本次调查分析表明，该区生境有利于鸭脚木种群的生长且该种群形成了良好的生存策略，其幼龄个体较多且后备资源丰富，能够较好地补充各龄级个体自然死亡造成的损失，对森林的天然更新起到一定促进作用。
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