| 研究生: |
李豎筵 Li, Shu-Yan |
|---|---|
| 論文名稱: |
城市綠地土壤理化性質與微生物群落對草本覆蓋梯度及復植之響應 Soil physicochemical properties and microbial community responses to herbaceous cover gradients and revegetation in urban green spaces |
| 指導教授: |
黃兆立
Huang, Chao-Li |
| 學位類別: |
碩士 Master |
| 系所名稱: |
生物科學與科技學院 - 熱帶植物與微生物科學研究所 Institute of Tropical Plant Sciences and Microbiology |
| 論文出版年: | 2026 |
| 畢業學年度: | 114 |
| 語文別: | 中文 |
| 論文頁數: | 117 |
| 中文關鍵詞: | 都市綠地 、自然解方 、草本復植 、總體基因體組裝基因體 、結構方程模型 、氮循環 |
| 外文關鍵詞: | Urban Green Spaces, Nature-based Solutions, Herbaceous Revegetation, Metagenome-Assembled Genomes (MAGs), Structural Equation Modeling, Nitrogen Cycle |
| 相關次數: | 點閱:47 下載:3 |
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本研究探討都市綠地(Urban Green Spaces, UGS)的草本綠覆率梯度與基於自然解方(Nature-based Solutions, NbS)的植被復育策略,如何共同驅動土壤理化性質與地下微生物群落的演替。廣域調查結果顯示,都市綠地的土壤普遍面臨嚴重的砂質化限制與結構劣化。隨著綠覆率降低,受損裸露地的表土受營建殘留物風化的影響,導致鹼土金屬蓄積;同時,因缺乏植物根系的吸收與截留作用,造成速效氮大量流失,進而使表土的穩定同位素(如δ15N)比值顯著升高並產生重同位素富集現象。在極端環境的壓力下,微環境內特定微生物的相對豐度大幅下降,地下群落轉由具備抗逆境特性的放線菌門(Actinomycetota)占據優勢,且此時的群落組裝(Community assembly)主要受隨機過程(Stochastic processes)支配,結構呈現高度不穩定性。為復育此劣化土壤,本試驗引入玉龍草單植與複合豆科混植處理,並配合落葉留置策略。結果證實,先驅植被的建立能有效提升表土持水能力,並降低隨機過程對微生物群落組裝的影響,轉由植物根際主導的環境篩選(Environmental filtering)接手。此機制進一步驅使微生物的分類組成與功能表現,朝向原生高綠覆的基準樣區發生決定性演替(Deterministic succession)。透過結構方程模型與總體基因體分箱(Metagenomic binning)所得之微生基因體(MAGs)資訊進行深入分析,結果表明植被重建主要透過改變土壤 pH 值與有效態硝酸根(NO3-)含量,發揮關鍵的間接改善作用。密集發育的細根網絡對速效氮產生強烈的吸收競爭,改變了地下部的養分環境,進而富集以富營養型(Copiotrophic)假單胞菌門(Pseudomonadota)為主導的核心微生物組,並顯著擴張參與氨氧化與反硝化作用等關鍵步驟的功能基因群(Functional gene repertoire)。綜上所述,本研究從分子生態學觀點指出,NbS策略有助於減緩都市劣化土壤的速效養分流失,並促進氮循環相關微生物群落的功能恢復,為都市綠地的生態管理與復育提供具體的實證基礎。
This study investigated how surface herbaceous green coverage gradients and nature-based solutions (NbS) through revegetation drive belowground soil properties, soluble ion pools, and microbial community succession in urban green spaces (UGS). A wide-area survey showed that UGS substrates face severe sandy texture constraints and structural degradation. Along a declining vegetation gradient, bare soils exposed to concrete masonry weathering exhibit alkaline earth metal accumulation and elevated topsoil pH. Due to the lack of root assimilation, topsoil δ15N showed significant positive enrichment, indicating an open, high-loss soil nitrogen cycle. Under severe physical and chemical filtering, unique niche-specialized microorganisms were eliminated. Belowground community structures distinctly separated, being absolutely monopolized by oligotrophic Actinomycetota, primarily Thermoleophilia, adapted to resource deficits under stochastic drift. An in situ controlled ecological restoration experiment was established on the most degraded bare site to evaluate single planting (Ophiopogon japonicus) and mixed legume planting under litter retention. Vegetation treatments significantly elevated soil gravimetric water content, relieving initial water stress and triggering a surge in functional α-diversity. In the NMDS topological ordination space, microbial community trajectories broke away from stochastic drift and shifted deterministically toward the native healthy baseline. Structural equation modeling and metagenome-assembled genome analyses demonstrated that this vegetation-mediated restoration was predominantly governed by the indirect effects of two major abiotic filters: soil pH and available nitrate. Densely developed fine root systems exerted robust assimilatory capture, significantly depleting soluble nitrate compared to the bare control. The reconstruction of this chemical resource barrier acted as a deterministic force, selectively enriching specific core clusters dominated by rhizosphere Pseudomonadota. This process effectively relieved metabolic streamlining stresses that demand survival defense enzymes like thymidylate synthase (thyA/TYMS) and dihydrofolate reductase (DHFR/folA) commonly found in the degraded control. Furthermore, these plant-enriched clusters exhibited significant expansion in functional genes governing ammonia oxidation (amoA) and denitrification (nirK, nirS, nosZ). At the microscopic molecular level, this study validated the capacity of NbS to redirect degraded urban ecosystems from open, high-loss regimes toward tightly coupled, closed biogeochemical cycling.
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