生態特性に基づいた熱帯林樹種の挿木発根能力の予測

基于生态特征的热带林木树种采伐生根能力预测

• 批准号: 12760110
• 负责人: 伊東 明
• 金额: $ 1.15万
• 依托单位: Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Encouragement of Young Scientists (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12760110/
• 关键词: 挿木; 発根; 熱帯林; 苗木; フタバガキ; 生態系修復; 森林保全; サラワク; タイ

1.生態特性データを基にサラワク熱帯雨林樹種の挿木発根率を推定するためのロジスチック回帰モデルを作成した.このモデルは,各樹種の最大直径,生育場所の土質,標高,傾斜の特性値から,挿木の発根率を推定する.調査区(面積52ha)に300個体以上が分布する298種に本モデルを適用したところ,推定発根率20%未満の種が25種(8.3%),20%〜50%が243種(81.5%),50%以上が34種(14.0%)であった.ただし,現時点での推定精度は実用上十分とはいえず,モデルの改良が必要である.2.熱帯季節林樹種の発根能力を調査するため,タイ北部の乾燥フタバガキ林構成樹種10種について,密閉法および被陰下でのビニールポット挿床による実験を行った.いずれの樹種でも発根は全く見られなかった.また,生態特性解明のため,永久調査区(1ha)で胸高直径1センチ以上のすべての個体の再計測を行い,Dalbergia dibgbauebsu(マメ科)の直径成長が特に早いことが明らかになった.3.以上の結果から,熱帯林樹種の挿木発根能力と生態特性の関係を次のようにまとめた.熱帯雨林樹種の挿木発根能力は,その種の最大直径,生育地の特徴,成長速度,萌芽能力と有意な関係をもつ.これらの特徴から,挿木可能性が未知の樹種の発根能力をある程度予測できた.しかし,現在の予測精度は低く,極めて可能性の高い一部の種を特定することが可能な程度である.一方,熱帯季節林の樹種は,熱帯雨林の樹種と比べて成長が早く,萌芽能力が極めて大きいが,挿木の発根は全く見られなかった.熱帯雨林と熱帯季節林では,生態特性と挿木発根能力の関係が異なっていることが示唆される.

1. Ecological characteristics of the forest tree species in the hot zone are estimated based on the establishment of the tree root rate. The maximum diameter of each tree species, the soil quality of the growing site, the elevation, the inclination, and the root growth rate of the tree are estimated. In the survey area (area 52 ha), more than 300 individuals were distributed, 298 species were suitable, and the estimated root rate was 20%, 25 species (8.3%), 20%~50%(81.5%), and more than 50%(34 species (14.0%)). 2. Investigation on the ability of tree species to grow roots in seasonal forest in hot zone. 10 species of tree species constituting dry forest in northern part of China. The tree species in the middle of the tree is full of roots. The results show that the growth of diameter of Dalbergia dibgbauebsu (family) in the permanent survey area (1ha) is very early, and the relationship between the root development ability and ecological characteristics of tree species in the thermal zone is secondary. Rooting ability of tropical rain forest tree species is related to the maximum diameter of the species, characteristics of the breeding site, growth rate, germination ability and intention. The probability of tree growth and the ability of tree growth to grow roots are estimated. The accuracy of prediction is low, the probability is high, and the probability is high. In one direction, the tree species in the hot zone seasonal forest grow earlier than the tree species in the hot zone rainforest, and the germination ability is extremely high. The roots of the tree grow completely. The relationship between thermal zone rainforest and thermal zone seasonal forest, ecological characteristics and root development ability of trees is different.

项目成果

Itoh, Akira: "Rooting ability of cuttings relates to phylogeny, habitat preference and growth characteristics in tropical rain forest trees"Forest Ecology and Management. (in press). (2002)

Itoh, Akira：“插条的生根能力与热带雨林树木的系统发育、栖息地偏好和生长特征有关”《森林生态与管理》。