JapanFlux2024 JP-Ynf Yona-Field Tower Site

This is the southernmost university training forest in Japan, located in the "Yanbaru" region in the northern part of Okinawa's main island.A variety of trees make up the highly diverse forest. The training forest was established in 1954. It is located on the west side of the Seiryo Mountains in Kunigami Village, and is leased from the 76-79 stock group of the prefectural forest.
Subtropical evergreen broadleaf forests dominated by Japanese knotweed and iju are widespread. Ten percent of the total area has been converted to planted forests of Ryukyu pine, cedar, iju, and Japanese cypress.
In March 2013, a 15-meter-high observation tower will be installed on the ridge of Group 79. Located in the southernmost part of Japan, the tower is expected to play a major role in clarifying the actual conditions of the material canopy of subtropical forests, where little is known. Observation of water, heat, and CO2 fluxes between the forest and the atmosphere has begun at the tower. In a 0.25 ha plot centered on the tower, regular surveys of tree growth, leaf area index, litterfall, and soil respiration are also being conducted.

本实训林为日本最南端的高校实训林，坐落于冲绳本岛北部的山原（Yanbaru）地区。该林分由丰富多样的树种构成，拥有高度复杂的森林群落结构。本实训林始建于1954年，位于国头村清凉山脉西侧，租赁自县营林的76-79林分组。
以虎杖（Japanese knotweed）及iju为优势种的亚热带常绿阔叶林广泛分布于该区域。林分总面积的10%已被改造为琉球松、雪松、iju及日本扁柏的人工林。
2013年3月，79林班的山脊上架设了一座高15米的观测塔。作为日本最南端的同类观测设施，该塔将为阐明鲜为人知的亚热带森林物质冠层实际状况发挥关键作用。目前已依托该塔开展森林与大气间水、热及二氧化碳（CO₂）通量的连续观测。在以该塔为中心的0.25公顷样地内，同步开展树木生长、叶面积指数（leaf area index）、凋落物量及土壤呼吸的常规监测工作。