Population quantitative characteristics and dynamics of rare and endangered plantDavidia involucratain Hunan Province

Abstract

Davidia involucrata Baill is the only species in Davidiaceae. It originated from tertiary period and now is a relic plant known to the world. But now, it becomes one of the world famous ornamental tree for gardens and parks in many countries because its flowers look like flying doves ( dove tree) . In recent years, the increase of regional developing projects has led to decrease of this ancient and rare plant in nature, especially its habitats and populations. The plant has been listed in the rare and endangered plants in China. D. involucrata mainly distributed in very special niche habitats in the mountainous region of Youngzi River in China. To better understand its natural community and propose management strategy, we investigated the population structure and natural succession of D. involucrata in Hunan province. Seven plots were established in Badagongshan and Hupingshan Nature Reserves. We developed a static life table of D. involucrata based on the population life table and theory of survival analysis. Survivorship curves, mortality rate, killing power, survival rate, mortality density and hazard rate were determined. The results showed that the population structure of D.involucrata was an inverse鄄pyramid type. The death rate of young trees was higher. The D. involucrata population in Hunan province was declining. There were fewer young and old D. involucrata trees in Badagongshan and Hupingshan Nature Reserves. The young trees mainly belonged to sprouted seedlings. Population structure was fluctuated and the survival curve

Population structure and quantitative characteristics of Tetracentron sinense (Trochodendraceae) in Leigong Mountain Nature Reserve, China

“…However, the dynamic index between adjacent age classes was negative, especially for the I age class. Furthermore, the seedling and sapling individuals were usually lacking that was consistent with those of Davidia involucrata (Liu et al 2012). These results indicated that most of the T. sinense populations investigated in the LMNR were relatively stable, but some of they were in early recession (Deevey 1947).…”

Predicting the Potential Habitat Distribution of Relict Plant Davidia involucrata in China Based on the MaxEnt Model

“…The geographic distribution data of D. involucrata were collected from two approaches, most of which were obtained from the Global Biodiversity Information Facility (GBIF, https://www.gbif.org/ (accessed on 8 September 2023)) and the Chinese Virtual Herbarium (CVH; http://www.cvh.org.cn/ (accessed on 8 September 2023)); the rest were obtained directly from related literature [28,[47][48][49]. To avoid the effect of spatial autocorrelation caused by the too-close spatial distribution points, after eliminating the duplicate and unclear (without accurate coordinates of latitude and longitude) records [50], we used the SDM toolbox (version 2.6) [51] in ArcGIS10.2 to ensure that only one distribution record existed within 10 km × 10 km [52], which finally gained a total of 130 distribution points (Figure 1).…”

“…Since its discovery by French priest Davis in Muping (Baoxing), Sichuan Province, in 1869, D. involucrata has been introduced to numerous countries and regions, becoming a renowned economic and ornamental garden tree worldwide. Current studies on D. involucrata mostly focus on its photosynthetic characteristics [24], gene cloning and expression [25][26][27], population structure and dynamics [28,29], and community characteristics and diversity [30]. Regarding its geographical distribution, most existing studies primarily consider climate factors as the main environmental variables [31,32], while soil factors have received less attention.…”