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Back台北市樹冠面積兩年減少13.7公頃,研究員憂心市府稱非隨意砍樹
台北市樹冠面積兩年減少13.7公頃,研究員憂心市府稱非隨意砍樹
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自由时报1 hour agoEnvironment2 min readChinaView translation

台北市樹冠面積兩年減少13.7公頃,研究員憂心市府稱非隨意砍樹

Quick Look

中央研究院研究員沈聖峰利用衛星影像發現台北市兩年樹冠面積淨減少13.7公頃,且減少幅度年增,引發憂慮;台北市公園處回應稱減少區域包含國立大學校舍、國道交流道等開發,非市府隨意砍樹,並強調近兩年新增超過1.3萬棵樹。

AI-generated summary

Why It Matters

台北市近期多處路樹遭砍,引發各界討論。中央研究院生物多樣性研究中心研究員沈聖峰利用衛星影像計算樹冠面積變化。

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台北市近期多處路樹遭砍,引發各界討論,中央研究院生物多樣性研究中心研究員沈聖峰指出,根據衛星影像計算,這2年來台北市樹冠面積淨減少13.7公頃,而且第二年減少的幅度比第一年更大,直言這令人憂心。對此,北市公園處回應,樹冠減少區域包含國立大學校舍、國道交流道等開發,顯非市府隨意砍樹。

沈聖峰在臉書表示,為了了解台北市砍樹狀況,他們根據歐洲太空總署(ESA)的Sentinel-2 衛星影像做了一次系統性的計算,把每年同一季節的多幅影像合成,判讀出樹冠面積,並且把市街內部與山邊林地的交界帶分開統計,避免大片山林把城市裡的細微變化掩蓋掉。

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結果北市樹冠消失狀況比預期的還要令人吃驚,光是市街內部,樹冠面積就從2024年的628公頃降到2026年的615公頃,兩年淨減少13.7公頃,而且第二年減少的幅度比第一年更大。

若以每棵樹冠約10平方公尺粗略換算,這相當於1萬3000多棵樹的樹冠從市區消失。把減少的位置畫在地圖上,紅點幾乎布滿整個盆地,並不只集中在少數幾處。

不過沈聖峰強調,衛星看到的是地表覆蓋的變化,無法分辨是砍除、移植、修剪還是颱風,他們不打算替這些數字下結論,「但不管原因是什麼,在一個大家都在談減碳與生物多樣性的年代,看到首都的樹冠一年比一年少,實在很難不憂心」。

對此,台北市政府公園處發表聲明回應,比對相關資料後表示,報告指出的樹冠面積減少較大的地點成因,私人土地開發外,亦包含台大校地開發、國道交流道綠蔭減少等包含中央建設的案例,顯非市府任意砍樹造成;公園處強調,市府具體實踐樹木只增不減,近兩年已新增超過1.3萬棵樹,明年市區將再增3555棵,也願與沈研究員團隊交流、一同推動台北綠色基盤建設。

What to Watch

AI outlook — possibilities, not facts

  • 台北市公園處將與沈聖峰團隊交流,共同推動台北綠色基盤建設。

    Likely · Within months

Open Questions

  • 樹冠減少的具體原因是砍除、移植、修剪還是自然災害?
  • 市府新增的1.3萬棵樹中,有多少是成活的?
  • 未來是否會有更精準的監測機制來區分人為與自然因素?

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