戴云山黄山松群落生态火用空间异质性

Eco-exergy spatial heterogeneity of Pinus taiwanensis community in Daiyun Mountain

热力学指标生态火用作为传统群落结构指数的补充,通过衡量物种包含的遗传信息量化群落生物热力学空间结构,评估其群落稳定性和健康程度。基于生态火用理论研究了戴云山黄山松(Pinus taiwanensis)群落乔木层、灌木层生态火用和结构火用的空间异质性及分布规律。主要结果如下:(1)乔木层和灌木层分别是群落生态火用和结构火用的主要贡献者。(2)黄山松种群在群落中具有更高的竞争能力和生存概率,群落生态火用贡献率为98.39%,对维持群落结构稳定性具有关键作用。(3)乔灌层的生态火用和结构火用在研究尺度上均具有强烈空间自相关,其空间异质性主要由结构性因素引起,所占比例大于75%。(4)乔灌层的生态火用和结构火用均呈明显条带状及斑块状分布,有多个明显高值区,等值线较弯曲且密集,空间异质性程度较高。研究确定了戴云山黄山松种群的热力学地位,黄山松在维系戴云山群落结构稳定和群落健康中发挥着重要作用,结果可为黄山松群落演替动态和可持续管理提供科学依据。

As a supplement to the traditional community structure index system,eco-exergy is applied to forest ecosystems to quantify the bio-thermodynamic spatial structure of the community by measuring the genetic information contained in the species,and to measure and evaluate the stability and health of the community.Based on the eco-exergy theory,the spatial heterogeneity and distribution of tree layer and shrub layer of Pinus taiwanensis community in Daiyun Mountain were studied by geostatistics and GIS technology.The main results are as follows:(1)Tree layer and shrub layer are the main contributors to community ecology and structure,respectively.(2)P.taiwanensis population has higher competitiveness and survival probability in the community,and the contribution rate of community ecology is 98.39%,which plays a key role in maintaining the stability of community structure.(3)Eco-exergy and specific eco-exergy of tree and shrub layer have strong spatial autocorrelation on the local scale,and their spatial heterogeneity is mainly caused by structural factors,accounting for more than 75%.(4)The eco-exergy and specific eco-exergy of tree and shrub layer show obviously banded and patchy distribution.There are many obviously high value areas,the isoline is curved and dense,and the degree of spatial heterogeneity is high.The study could not only confirm the thermodynamic status of P.taiwanensis population in Daiyun Mountain,but also highlight its crucial role in maintaining community stability and complexity.The results could provide a theoretical basis for the succession dynamics and sustainable management of P.taiwanensis community.