登入選單
返回Google圖書搜尋
Leaf Function in Tropical Rain Forest Canopy Trees
Toon Rijkers
其他書名
The Effect of Light on Leaf Morphology and Physiology in Different-sized Trees
出版Ponsen & Looijen B.V, 2000
ISBN90580831449789058083142
URLhttp://books.google.com.hk/books?id=8ZARAAAACAAJ&hl=&source=gbs_api
註釋The mean leaf life span of different-sized trees for Vouacapoua was 61 months (range 27-101) and for Dicorynia 32 months (range 17-54). The variation in traits in response to leaf age was low. Photosynthetic capacity and nitrogen concentration were relatively constant with time; leaf mass per unit area increased during the first 18 months. Simulations of the daily carbon gain with a low- and highlight regime showed differences among both sun- and shade-leaves and trees of different sizes. Leaf construction cost was independent of leaf life span. Leaf payback time was relatively short (4 to 40 days); it was constant during a wide range of irradiance, but increased sharply in a narrow range of low light. The rate of net return on carbon investment was slow in long-lived leaves of Vouacapoua . Leaf mass per area decreased with increased leaf life span, which could be explained by a light- and height-dependent selection pressure for leaf life span and leaf mass per area.