植物生态学报 ›› 2008, Vol. 32 ›› Issue (3): 734-740.DOI: 10.3773/j.issn.1005-264x.2008.03.023
• 综述 • 上一篇
收稿日期:
2007-04-24
接受日期:
2007-09-19
出版日期:
2008-05-30
发布日期:
2008-05-30
通讯作者:
牛铮
作者简介:
*E-mail:niuz@irsa.ac.cn基金资助:
WU Chao-Yang1,2, NIU Zheng1,*()
Received:
2007-04-24
Accepted:
2007-09-19
Online:
2008-05-30
Published:
2008-05-30
Contact:
NIU Zheng
摘要:
应用遥感技术可以建立光化学植被指数(Photochemical reflectance index, PRI)和光能利用效率(Light use efficiency, LUE)的关系,LUE可用来估算净初级生产力(Net primary productivity, NPP)。因而,用PRI估算植物的LUE,为估算NPP提供了新的方法,弥补了以往以经验模式通过温度和水分对最大LUE的胁迫来获取实际LUE的不足,进而可提高 NPP 的估算精度。研究表明:PRI和LUE在叶片、冠层和景观尺度上都有着很好的相关性,但是随着尺度的变化,很多因素会对这一关系产生干扰,如水分、氮元素含量、叶面积指数和太阳高度角等,从而削弱了PRI和LUE的关系。该文对建立PRI和LUE的关系过程中的影响因素进行了分析,并指出今后这一研究领域中可能改进的方面,主要包括526 nm 和545 nm 处的反射率对531 nm 处的反射率的作用机制、PRI随LUE的饱和现象、PRI和LUE关系的时间效应以及利用PRI估算LUE的尺度效应。
吴朝阳, 牛铮. 光化学植被指数估算植物光能利用率的研究进展. 植物生态学报, 2008, 32(3): 734-740. DOI: 10.3773/j.issn.1005-264x.2008.03.023
WU Chao-Yang, NIU Zheng. REVIEW OF RETRIEVAL LIGHT USE EFFICIENCY USING PHOTOCHEMICAL REFLECTANCE INDEX (PRI). Chinese Journal of Plant Ecology, 2008, 32(3): 734-740. DOI: 10.3773/j.issn.1005-264x.2008.03.023
类型Type | 公式 Formula | 来源 Sources | |||||
---|---|---|---|---|---|---|---|
线性 Linearity | PRI=20LUE-0.4 | Peňuelaset al., | |||||
PRI=33.3LUE-0.53 | Peňuelaset al., | ||||||
PRI=5.98LUE-0.093 | Nichol et al., | ||||||
非线性 Nonlinearity | PRI=0.16(LUE-0.009 6)/(0.012+LUE-0.009 6) | Peňuelaset al., |
表1 PRI和LUE的关系
Table 1 Relationships between PRI and LUE
类型Type | 公式 Formula | 来源 Sources | |||||
---|---|---|---|---|---|---|---|
线性 Linearity | PRI=20LUE-0.4 | Peňuelaset al., | |||||
PRI=33.3LUE-0.53 | Peňuelaset al., | ||||||
PRI=5.98LUE-0.093 | Nichol et al., | ||||||
非线性 Nonlinearity | PRI=0.16(LUE-0.009 6)/(0.012+LUE-0.009 6) | Peňuelaset al., |
干扰 Interferences | PRI响应 PRI responses | 来源 Sources | |||
---|---|---|---|---|---|
叶片取向 Leaf direction | 水平 Planophile | 6.23% | Barton & North, | ||
垂直 Erectophile | -7.52% | ||||
物种数量 Species number | 单一种 Single species | R2=0.97, p<0.001 | Nichol et al., | ||
8物种 Eight species | R2=0.79, p<0.001 | Trotter et al., | |||
物候变化 Seasonal change | 单一时相 Single time | 稳定 Stabilization | Trotter et al., | ||
四季 Four seasons | 斜率、截距变化 Slope and intercept change | Nakaji et al., | |||
叶面积指数LAI | 3.0 | 1.0 | -143.80% | Barton & North, | |
3.0 | 5.0 | 22.89% | |||
几何关系 Geometrical relationship | 太阳天顶角 Sun zenith angle | 45° | 60° | 41.23% | Barton & North, |
45° | 30° | -26.70% | |||
观测天顶角 View zenith angle | 天底角 Nadir | 30° | 35.51% | ||
-30° | -20.24% | ||||
湿土壤 Wet soil 干土壤 Dry soil | -18.83% | Barton & North, |
表2 各种参数对PRI和LUE关系的影响
Table 2 Effects of some parameters on relationships of PRI and LUE
干扰 Interferences | PRI响应 PRI responses | 来源 Sources | |||
---|---|---|---|---|---|
叶片取向 Leaf direction | 水平 Planophile | 6.23% | Barton & North, | ||
垂直 Erectophile | -7.52% | ||||
物种数量 Species number | 单一种 Single species | R2=0.97, p<0.001 | Nichol et al., | ||
8物种 Eight species | R2=0.79, p<0.001 | Trotter et al., | |||
物候变化 Seasonal change | 单一时相 Single time | 稳定 Stabilization | Trotter et al., | ||
四季 Four seasons | 斜率、截距变化 Slope and intercept change | Nakaji et al., | |||
叶面积指数LAI | 3.0 | 1.0 | -143.80% | Barton & North, | |
3.0 | 5.0 | 22.89% | |||
几何关系 Geometrical relationship | 太阳天顶角 Sun zenith angle | 45° | 60° | 41.23% | Barton & North, |
45° | 30° | -26.70% | |||
观测天顶角 View zenith angle | 天底角 Nadir | 30° | 35.51% | ||
-30° | -20.24% | ||||
湿土壤 Wet soil 干土壤 Dry soil | -18.83% | Barton & North, |
图1 以散点图表示的冠层性质以及几何关系对光化学植被指数(PRI)和光能利用效率(LUE)关系的影响 LUE基于冠层吸收的光合有效辐射,太阳天顶角为20°~60°,观测天顶角为-60°~60°,叶面积指数(LAI)变化范围为0~8, 3种叶片形状的蒙特卡洛模拟 LUE is based on incident photosynthetic photon flux density (PPFD) absorbed by the canopy absorbed photosynthetically active radiation (APAR). Monte Carlo sampling with solar zenith (20°-60°), view zenith (-60°-60°), leaf area index (LAI) (0-8), three LADs (Leaf angle distribution), and two soil types (from Barton & North, 2001)
Fig.1 Scatter plot showing the influence of canopy properties and view and illumination geometry on the relationship between canopy photochemical reflectance index (PRI) and canopy light use efficiency (LUE) (from Gamon et al. 1997)
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