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[其他资源] 对太阳辐射的拦截叶形状的影响 The effect of leaf shape on the interception of sol

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    发表于 2014-12-8 17:09 |只看该作者 |倒序浏览
    |招呼Ta 关注Ta
    The effect of leaf shape on the interception of solar radiation: y+ B- k/ _. o$ t+ a. V
    C.B.S. Teh*
    ' z& h$ c2 M! ODepartment of Land Management, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor,
    ' C, _: g5 h, E" W" B# mMalaysia
    ' O! E. D) v6 N/ s; U* a# y5 Abstract
    & X2 V9 t6 |  W& u( c, P. Z; Q1 yOne of the properties of canopy architecture is leaf shape, and its effect on solar radiation
    - O0 G  m  {" _# tinterception by a plant is little understood and studied. Consequently, this study was to evaluate9 ^% \4 f" s6 E; @6 V
    the effect of six leaf shapes on both direct and diffuse solar radiation interception using a
    : S& U' H+ o, y6 l0 a4 idetailed 3-D solar radiation model. Six hypothetical plant prototypes were computer-generated. P2 l$ G# J8 }! W) J- n
    10 so that each prototype was equal to each other in all aspects; only the leaf shape for each
    " |6 X4 a: \' Z0 k9 kprototype was varied. The leaf shapes selected were round (RD), square (SQ), triangle (TR)," P. M( w  S. v  X' L4 E- a; m
    inverted triangle (ITR), ellipse (EL) and lobe (LB). Computer simulations revealed that leaf  u0 d& d/ H' L
    shape did have an effect on direct and diffuse solar radiation interception. However, its effect
    : n! J% c9 P2 M% E# }5 P7 A3 Awas to a rather small extent of not more than 11% increase in solar radiation interception. The
    . e- {8 S: Y- s$ }3 y1 O15 mean hourly interception of solar radiation by the prototypes decreased in the following1 A: g- O; V5 Z  M, @! ?
    manner: (ITR ≈ EL) > (RD ≈ SQ ≈ TR ≈ LB). Although leaf lobbing is often hypothesised to1 E7 f; y4 W  a; E2 u
    produce deeper sunflecks within the canopy, this study however revealed that leaf lobbing per/ N" ~* _5 r5 s  T$ @( ?
    se had no effect on solar radiation interception. All properties being equal, solar radiation2 T  r& h! ?, _  _1 Y  b, a
    interception could be increased by having leaf shapes that are: 1) long and narrow, 2) broader at# y8 h! O# Y) U3 m% E. T* x& v
    20 the apex than at the basal, and 3) supported by leaf petioles. These three conditions increase& A- B3 V4 X1 y( ^
    solar radiation interception by causing the canopy to be spread out more uniformly in the aerial
    8 N" q( j2 M2 ~7 m) \# [  pspace; this, in turn, means less leaf clustering and self-shading. However, the effect of leaf
    8 M% U% u" n1 g3 r4 Hshape on solar radiation interception decreases for near or full canopy cover because at this
    / I+ @6 O  k6 ?# [9 J! sstage, the canopy is already intercepting solar radiation at near maximum capacity. Leaf shape! ?9 P( N! _4 [
    25 also did not affect the diurnal variation of direct and diffuse solar radiation interception. This
    5 m( g3 x! R- Ystudy may help to better select crop varieties having the “proper leaf form” for optimum plant6 y3 P- Q% m) N4 |  v+ T8 Z0 _% p, {
    production, as well as to better understand plant adaptation mechanisms in response to
    3 c. Q% W$ @* W" k% lenvironmental stresses.' ]( s0 {! I- E, a) P! [
    Keywords: leaf shape; solar radiation; Beer’s law; canopy architecture
    0 k) O# Y9 C  d1 u. t' V. `% Q4 G. \& I! B+ P

    0 E, _* J. I( d  M7 ?/ z4 R' d1 V3 F* `% \
    leafshape.pdf (409.86 KB, 下载次数: 2)
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    ) d  b  z/ b* w# k# Y; m/ i! H' l9 X% x; ?( `% q: F8 r; h
    ) s) W  E* L, L% |1 H# P, |
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