George Koch教授與其研究團隊在檢視這些樹木的葉片組織結構、光合作用能力、與二氧化碳濃度後發現:在樹木頂端的葉片反應著嚴重的缺水徵狀,就如同這些樹木是生長在沙漠一般。畢竟,樹木將水份從根部、經木質部(xylem)再運送至葉子時,必須克服重力與導管內摩擦力障礙,所以要將水分從土壤中攜帶到一百多公尺高的樹葉,確實相當艱辛,而水分的輸送不易也最直接地影響樹木的生長。因此,George Koch教授認為:這些近兩千歲高齡的樹木雖然目前仍維持著每年0.25公尺的生長速度,但它們想多長高15公尺,還是相當困難。
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