Subjects: Biology >> Botany >> Applied botany submitted time 2022-07-05 Cooperative journals: 《广西植物》
Abstract： The spatial distribution pattern of population is an important means to describe population characteristics, interspecific interactions, and its relationship between population and environment. Cyclobalanopsis glauca is a constructive population of climax community in karst ecosystems, in order to further understand the spatial distribution pattern of its populations. According to the sample plot investigation specification, a sample plot of 60 m × 60 m was set up, and the woody plants in the plot were spatially located and investigated for each tree. The C. glauca population was divided into three different diameter classes in the study, belonging to saplings (DBH<2 cm), small trees (2 cm≤DBH<10 cm), adult trees (10 cm≤DBH). Using the point pattern analysis method, g (r) and L12 (r) functions based on Ripley’sK function was used for the analysis of the spatial distribution pattern and correlation analysis of C. glauca population in different diameter classes. The results were as follows: (1)The diameter class structure of C. glauca population is in an inverted “J” distribution. (2) On the small scale, the stage of saplings, small trees and adult trees, the spatial distribution pattern tends to cluster distribution，and the small trees, large tree stage tends to random distribution on the large scale. (3) The performance of spatial correlation between different diameter classees is different, the seedling and sapling are positively related on the scale of 0-15 m; sapling and adult trees reflected in the scale of 0-10 m is no correlation, it showed a positive correlation on the scale of 10-15 m; Seedling and adult trees performance on the scale of 0-2 m is no correlation, it showed positive correlation on the scale of 2-15 m. The spatial distribution pattern and correlation of C. glauca population in the karst area of Guilin change with the spatial scale and development stage, which was the result of the combined effects of the population’s bioecological characteristics, intraspecific and interspecific relationships, and environmental conditions. The results of the study can provide basic information for the formation and maintenance mechanism of plant community and resource utilization research of karst hills.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-07-05 Cooperative journals: 《广西植物》
Abstract： In order to analyze the variation characteristics and the effect of microhabitat on leaf functional traits of woody plants in Tiankeng. Shenmu Tiankeng is a typical karst Tiankeng in Dashiwei Tiankeng Group in Guangxi, and there is a well-preserved underground forest that is easily accessible. Ten leaf functional traits (leaf thickness, leaf tissue density, leaf area, etc.) were selected to study woody plants in different microhabitats (bottom, waist, and edge) of Shenmu Tiankeng. Single-factor analysis of variance and correlation analysis were conducted to investigate the relationship between leaf functional traits in different microhabitats. The results were as follows: (1) The variable coefficient for leaf area (113.9%) was highest, while leaf carbon content was relatively stable (10.5%). (2) Ten leaf functional traits were almost no significant difference (P>0.05) for woody lianas in three different microhabitats. The leaf tissue density for trees was significantly higher at the edge and waist compared to the bottom, while the leaf potassium content for trees and shrubs, that the bottom was higher than the edge. (3) Leaf thickness was extremely significantly positively correlated with leaf area (P<0.01) at the edge of Tiankeng. The results of principal component analysis suggested that leaf tissue density (-0.833), leaf potassium content (0.782), and leaf dry matter content (-0.647) were the critical indicators for leaf functional traits of woody plants in different microhabitats of Shenmu Tiankeng. This study demonstrate that different growth types of woody plants can adapt to the three microhabitats of Tiankeng via the trade-off of leaf functional traits. This study is expected to provide theoretical guidance for the protection of Tiankeng vegetation.
Hits
Hits
Downloads
Comment