Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/65914
標題: 構樹苗木對光度與水分之生理反應
Physiological responses to light intensities and water of Broussonetia papyrifera
作者: 陳忠義
Chen, Chung-I
關鍵字: Broussonetia papyrifera
構樹
light
water
physiological response
光度
水分
生理反應
出版社: 森林學系所
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摘要: 構樹廣泛分布於台灣中低海拔地區,其生育地從日射強烈之空曠地至鬱閉的海岸林防風林內,為了解其對不同光環境與其在海岸林下乾旱環境下之適應機制,本研究以不同光度與水分處理苗木,探討其形態及生理反應。 試驗結果顯示構樹苗木在低光下不但形態生長良好,且具有許多耐陰種之特徵,如比葉面積大(323.90 cm2 g-1)、光補償點低(7.01µmol m-2s-1)、葉綠素a/b小(2.46)等,且在高光照射後有快速調適的保護能力,而生長在高光下的苗木則有良好的光合能力與消散過剩能量機制,因此其對光度的適應範圍很廣,分布可從日射強烈之空曠地以至於鬱閉的林下。 構樹苗木在充分供水下生長良好,在20% 水分處理下生長最差,且有較低生物量,然缺水處理者之光合能力較充分供水者處於較低水勢(-2.87 MPa)時之調適能力強,Ci/Ca值約在0.5 - 0.8之間,顯示光合速率的降低主要是由氣孔因素所導致。因此,構樹在面臨乾旱逆境時主要是藉由關閉氣孔來避免體內水分過度散失,此外其葉面有毛與落葉之特性亦可能為幫助其適應乾旱之重要因子。
Broussonetia papyrifera is an expansive distribution tree species from medium to low elevation of Taiwan. The habitat of B. papyrifera has extreme differentiation in light environments. In order to understanding adaptation mechanism of B. papyrifera to different light intensity and water status, we set various light and water treatments and observed the responses on phenology and physiology. Results revealed that, B. papyrifera had well performance in shade and shown several characteristics such as high specific leaf area(323.90 cm2 g-1), low light compensation point(7.01µmol m-2s-1) and chlorophyll a/b ratio (2.46)of shade-tolerance species. B. papyrifera also shown the ability of fast recovery after irradiated by high light. Therefore, B. papyrifera which grown in high light environment shown the well photosynthetic capacity and mechanism of dissipation. So B. papyrifera acclimated broadly to different light environment and distributed from sunlit openness area to understory of windbreak forest. B. papyrifera had the best performance in well-watered treatment. Plants in water-stressed shown more tolerance in photosynthetical ability and better modulated ability to low water potential . The Ci/Ca ratio was between 0.5 and 0.8, so that the reduction in photosynthetic rate by water stress can be attributed to stomatal limitation. When suffered drought stress, B. papyrifera prevented water lose by closing stomata, it's hairy leaf and defoliation may also assist in acclimatized to drought.
URI: http://hdl.handle.net/11455/65914
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2308200716551400
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