标题: 对太阳辐射的拦截叶形状的影响 The effect of leaf shape on the interception of sol [打印本页] 作者: ゞ_轻描丶幸福的 时间: 2014-12-8 17:09 标题: 对太阳辐射的拦截叶形状的影响 The effect of leaf shape on the interception of sol The effect of leaf shape on the interception of solar radiation 9 D, D/ V$ D+ V8 D) @- kC.B.S. Teh*+ \ B) c- f4 l4 a6 h
Department of Land Management, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor,+ `" h* b6 p7 q# r
Malaysia ) c: [4 U1 |1 s' c5 Abstract( u# d- A& s! U4 O% t& {! O* |( {/ r
One of the properties of canopy architecture is leaf shape, and its effect on solar radiation . D3 o& ^) w6 @interception by a plant is little understood and studied. Consequently, this study was to evaluate * c ?. W+ Q5 s9 Bthe effect of six leaf shapes on both direct and diffuse solar radiation interception using a 3 j$ Y7 k( c. T6 R. r' L& Y8 bdetailed 3-D solar radiation model. Six hypothetical plant prototypes were computer-generated 9 r9 `+ q; O- U% q, b10 so that each prototype was equal to each other in all aspects; only the leaf shape for each 3 {: O6 q4 T. _! R, T8 Vprototype was varied. The leaf shapes selected were round (RD), square (SQ), triangle (TR), ) x4 L" P9 B! R: [9 s; rinverted triangle (ITR), ellipse (EL) and lobe (LB). Computer simulations revealed that leaf1 p z( o* F) F. t
shape did have an effect on direct and diffuse solar radiation interception. However, its effect . G$ Z8 x4 v* S4 p" R' X! iwas to a rather small extent of not more than 11% increase in solar radiation interception. The 2 Y' E/ |% j4 E* g) b4 V15 mean hourly interception of solar radiation by the prototypes decreased in the following. Z9 p' ~ H+ T) v- V% W8 |
manner: (ITR ≈ EL) > (RD ≈ SQ ≈ TR ≈ LB). Although leaf lobbing is often hypothesised to 9 N1 X3 y, k& N5 [2 uproduce deeper sunflecks within the canopy, this study however revealed that leaf lobbing per 0 c# D* x" `! ]" Tse had no effect on solar radiation interception. All properties being equal, solar radiation' O) K* @% F) ^! h& u, E
interception could be increased by having leaf shapes that are: 1) long and narrow, 2) broader at& ^, M+ g. Z8 v4 M. ^# O+ {
20 the apex than at the basal, and 3) supported by leaf petioles. These three conditions increase5 p; u u. _- o1 ] m
solar radiation interception by causing the canopy to be spread out more uniformly in the aerial" x; ?) ~5 e3 u! o( X$ r
space; this, in turn, means less leaf clustering and self-shading. However, the effect of leaf# d9 Y. @0 o0 e4 p# i" I
shape on solar radiation interception decreases for near or full canopy cover because at this* S) M! q) F' H J
stage, the canopy is already intercepting solar radiation at near maximum capacity. Leaf shape, ~" ] H- ? J" D* t' U2 @# j
25 also did not affect the diurnal variation of direct and diffuse solar radiation interception. This9 L- F, A7 A, D+ d9 E; E3 C
study may help to better select crop varieties having the “proper leaf form” for optimum plant& G7 j1 }, d) `% Z
production, as well as to better understand plant adaptation mechanisms in response to % u& f) z- L$ |9 k$ D4 _6 cenvironmental stresses. / K: D/ f7 \% L6 u1 y+ DKeywords: leaf shape; solar radiation; Beer’s law; canopy architecture ; @# n* A# }3 a* G5 C; W+ _9 Z% A7 o* ^4 Z* t
. q0 N3 \6 c1 `8 N6 u4 T( _& D. r( K: ~7 f leafshape.pdf(409.86 KB, 下载次数: 2)
2014-12-8 17:09 上传
点击文件名下载附件
下载积分: 体力 -2 点
# k8 w. p, |! j. ~
; o u7 ^& {4 C+ O( o2 Q
/ |, D0 w1 T8 A) m+ k" f
9 M, m6 W- Z6 W7 \6 a7 T3 g2 x
leafshape.pdf
(409.86 KB, 下载次数: 2)