Subjects: Biology >> Botany >> Applied botany submitted time 2022-03-18 Cooperative journals: 《广西植物》
Abstract： In-depth exploration of the species abundance distribution (SAD) pattern of plant communities under different terrains in the subtropical karst area can reveal the mechanism of formation of the SAD of the community under different terrains, thereby enriching the theory of plant community construction in this area. In this paper, the arbor layer and shrub layer of plant communities under four typical landforms of ridge, trough, saddle and depression in Maolan karst area of Guizhou Province were used as the objects. The empirical cumulative distribution function(ECDF) was used to characterize the SAD, at the same time, the Wilcoxon rank sum test was used to analyze the differences in species abundance between different terrains. Then different ecological models were used for fitting, and Kolmogorov-Smirnov (K-S) test and Akaike Information Criterion (AIC) were used to detect model acceptance and goodness of fit. The results were as follows: (1) There were differences in the number of individuals and species in plant communities under different terranes, the number of individuals in saddles was the most, the number of species in depressions was the most, and the number of individuals and species in ridges was the least. (2) There were significant differences among shrub layers, between ridge and saddle, between ridge and depression, between saddle and trough valley, and between saddle and depression, while there were no significant differences in the SAD of arbor layers in plant communities under different terrains. (3) The SAD of the arbor layer under different terrains was well accepted by the neutral model. The ridge fits best, but all terrains were poorly accepted by ecological models, only the ridge and saddle passed through the two niche models, and the goodness of fit was not as good as that of the neutral model. The shrub layer was also well accepted by the neutral model with the best fit of the saddle, but it was poorly accepted by the niche model, and only the depression passed the broken stick model. Overall, the arbor layer was more acceptable to the two ecological models than the shrub layer, probably because the SAD of the arbor layer had more obvious imprints of ecological processes. However, the difference in the goodness of fit of the shrub layer under different terrains is greater, which may be related to the more drastic changes of the shrub layer species to the environment. Consequently, different terrains lead to different ecological processes of community construction, and the SAD pattern gradually adapts to the terrain.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-13 Cooperative journals: 《广西植物》
Abstract： Paphiopedilum of Orchidaceae is a “flagship” group in biodiversity conservation, with high research value and ornamental value, and it grows in special environment. In order to understand the resource status and conservation effect of Paphiopedilum in Guizhou Province, this study conducted a special investigation of wild Paphiopedilum, and the resource status, distribution pattern, threatened factors and local protection of them were analyzed. The results were as follows: (1) A total of 103 distribution sites of 8 species of Paphiopedilum were found in this special survey, distributed in 27 Counties, with the southern and southwestern regions as the main distribution areas. Their habitats are complex and diverse, and the natural distribution are uneven; (2) Their distribution areas are sorted from the largest to the smallest as P. micranthum > P. barbigerum > P. malipoense > P. bellatulum > P. hirsutissimum > P. dianthum > P. emersonii > P. concolor, the order of resource richness from high to low is P. micranthum > P. barbigerum > P. hirsutissimum > P. bellatulum > P. malipoense > P. emersonii > P. dianthum > P. concolor; (3) The plants of this genus suffer from complex disturbance factors and serious threats, among which overexploitation, drought, habitat degradation and fragmentation are the main reasons for its endangered status; (4) Two species of the genus “effective protection (EP)”, one species of “well protection (WP)”, two species of “general protection (GP)”, three species of “less protection (LP)”, two species of “unknown protection status (UPS)” because no target species were found. The species conservation rate was 100%, but the conservation rate of distribution sites was 29.13%. There were significant differences in population conservation rates among different species. It is suggested that relevant departments should enhance the protection intensity of Paphiopedilum plants in Guizhou, and further optimize the protection mode and scope, so as to ensure the sustainable survival and development of these rare and endangered plant resources.
Subjects: Biology >> Botany >> Applied botany submitted time 2020-09-15 Cooperative journals: 《广西植物》
Abstract：兰科（Orchidaceae）植物是植物界中最进化、种类最丰富的类群之一，有较高的环境要求和较强的生态系统依存性，加上很多兰科植物具有较高的观赏价值和药用价值，各地采挖频繁，受威胁十分严重，已成为保护植物中的“旗舰”类群。本文基于文献资料和近年来课题组野外调查数据，分析贵州省野生兰科植物的地理分布状况、就地保护现状与保护空缺，以期为该地区野生兰科植物科学合理的保护管理提供参考。结果表明：（1）贵州省野生兰科植物共“累计筛选法”共鉴别出保护贡献率较高的前
Subjects: Biology >> Botany >> Applied botany submitted time 2019-08-26 Cooperative journals: 《广西植物》
Abstract： This study used national protected wild plants as indicator species and combined with the statistical survey information of national protected wild plants on the county (city, district) to analyze the geographical distribution feature of species richness based on the GIS technology in Guizhou Province. We applied Dobson algorithm to identify the protection priority area of national protected plant. Then we used the information of existing nature reserves to assess the protection status of the national protected wild plants priority conservation areas in Guizhou. The results were as follows: (1) In terms of the species richness distribution of the national key protected wild plants in Guizhou, the Southern region is generally higher than the northern region, and the species richness of the area extending inland from the provincial boundary is obviously decreasing. (2) In terms of the 75% and 100% national protected wild plants conservation levels,four and seventeen counties (cities, districts) were identified priority conservation areas, for example Libo County, respectively. Among them, 1 and 9 national priority zones of key protection of wild plants cover less than 5% of the nature reserves, and 68.26% of the areas involved were city/county level. (3) The areas with abundant wild plant species under state key protection and the biodiversity hotspots in the whole province have good spatial correspondence with the selected priority areas in Guizhou. (4) Local protection of wild plants under state key protection should be carried out in priority areas with rich geographical distribution of wild plants under state key protection combined with priority areas selected in this study in Guizhou.
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