会议名称：“2022世界木材日”研讨会暨第四届国际林联（IUFRO）林产品文化研究组讨论会
会议时间：2022年3月22日

报告嘉宾：Elaine Loreen C. Villanueva
嘉宾简介：菲律宾大学洛斯班那斯分校, Inocencio E. Buot Jr.教授科研团队人员

摘要：

Inventory studies on forests over limestone are critically important in un derstanding forest dynamics and in managing the complex forests land scape. However, there is lack of comprehensive inventory in Samar Island National Park (SINP) forests over limestone, a nominee to the UNESCO World Natural Heritage List. Thus, a study was conducted in SINP inland forests over limestone. The study aims firstly, to discuss the woody vegeta tion structure in Paranas and Taft forests of the SINP and secondly, it pre dicts the environmental factors affecting the characteristic physiognomy and ecology of Paranas and Taft forests using ordination analysis. Standard vegetation techniques were used and a total of eighteen 20m x 20m plots were established to assess the tree species (≥1m tall). The line intercept method was used within each plot to assess the plants in the understory. Plant abundance data were recorded and computed. Soil samples were collected while climate data were obtained from the Philippines’ Weather Bureau. To identify the major plant communities, cluster analysis was done using the relative basal area of trees per plot. Subsequently, a canonical correspondence analysis was done to pinpoint which environmental variables influenced the plant data sets. A total of 3,595 tree individuals in 72 species, under 46 genera in 35 families, were found in the sampling plots of Paranas and Taft in SINP. Cluster analysis revealed 3 vegetation clusters named after the dominant species: 1) Shorea-Manilkara-Walaceodendron Cluster, 2) Shorea and Hancea Cluster and 3) Shorea-Manilkara-Hancea Cluster. Canonical correspondence analysis identified elevation as having greater influence in the variation of the relative basal area of the species. Other factors affecting variation include, disturbance and soil nutrients like phosphorus, chlorine, and potassium.

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