Evaluation of the ability of vegetation recovery after human disturbance in fragile tropical forests on nutrient-poor soils

贫营养土壤上脆弱热带森林人为干扰后植被恢复能力评价

• 批准号: 19780125
• 负责人: MIYAMOTO Kazuki
• 金额: $ 1.91万
• 依托单位: Forestry and Forest Products Research Institute
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19780125/
• 关键词: 熱帯ヒース林; ケランガス; ポドゾル; 萌芽; 炭水化物; 窒素; 実生; 比根長; ヒース林; Dacrydium pectinatum; Hopea pentanervia; ボルネオ; 空間分布

Sprouting ability and seedling traits in relation to regeneration were examined for three dominant species (Dacrydium pectinatum, Podocarpaceae ; Hopea pentanervia, Dipterocarpaceae ; Tristaniopsis sp., Myrtaceae) to assess the ability of vegetation recovery after human disturbance such as logging and forest fire in a tropical heath forest on nutrient-poor soils in Nabawan, Sabah, East Malaysia (Borneo Island). Seedlings of Dacrydium and Tristaniopsis allocated more biomass to root than Hopea. Tristaniopsis seedlings showed a higher specific root length of fine roots suggesting effective nutrient uptake. The number of newly sprouted shoots per stump 6-8 months after stem cutting experiment was greater in Hopea (10.8 shoots on average) than the other two species. Sprouts were rarely observed in Tristaniopsis (0.3) and no sprouts in Dacrydium. Total non-structural carbohydrates concentration and nitrogen concentration of stem and root were higher in Hopea than the other two species, suggesting that large carboydrate reserves and high nitrogen availability support the sprouting ability in Hopea. Thus, among the three dominant species, only Hopea had a vigorous sprouting ability, indicating that quick vegetation recovery by sprouting after human disturbance would not be expected in this forest. Results suggest that tropical heath forest on nutrient-poor soils is vulnerable to human disturbance, although seedling regeneration can partly contribute to the vegetation recovery.

研究了三种优势物种（梳状胡檀、罗汉松科、龙脑香科、Tristaniopsis sp.、桃金娘科）的发芽能力和与再生相关的幼苗性状，以评估森林中伐木和森林火灾等人类干扰后植被恢复的能力。东马来西亚（婆罗洲岛）沙巴州纳巴湾营养不良土壤上的热带石南森林。 Dacrydium 和 Tristaniopsis 的幼苗比 Hopea 为根分配了更多的生物量。 Tristaniopsis 幼苗表现出较高的细根比根长度，表明养分吸收有效。茎切割实验后 6-8 个月，Hopea 的每个树桩新发芽的数量（平均 10.8 个）比其他两个物种更多。 Tristaniopsis (0.3) 中很少观察到芽，而 Dacrydium 中则没有观察到芽。 Hopea 的茎和根的总非结构碳水化合物浓度和氮浓度高于其他两个物种，表明大量的碳水化合物储备和高氮利用率支持了 Hopea 的发芽能力。因此，在这三个优势种中，只有希望树具有旺盛的发芽能力，这表明该森林在人为干扰后不可能通过发芽来快速恢复植被。结果表明，营养贫乏土壤上的热带石南森林很容易受到人类干扰，尽管幼苗再生可以部分促进植被恢复。

项目成果

貧栄養条件下に成立する熱帯林における主要樹種の萌芽特性

贫营养条件下热带森林主要树种的萌发特性

• 发表时间: 2010
• 作者: 宮本和樹;Reuben Nilus;壁谷大介;伊藤武治
• 通讯作者: 伊藤武治

熱帯ヒース林における優占種3種の実生の形態的特性

热带石南林3种优势种幼苗形态特征

• 发表时间: 2009
• 作者: 宮本和樹;Reuben Nilus
• 通讯作者: Reuben Nilus

貧栄養条件下に生育する熱帯性針葉樹Dacrydium pectinatumの実生定着様式

贫营养条件下热带针叶树Dacrydium pectinatum的育苗模式

• 发表时间: 2008
• 作者: 宮本和樹;Reuben Nilus
• 通讯作者: Reuben Nilus