A meta-analysis of the canopy light extinction coefficient in terrestrial ecosystems

doi:10.1007/s11707-014-0446-7

Front. Earth Sci.

2014, Vol. 8

Issue (4) : 599-609 https://doi.org/10.1007/s11707-014-0446-7

RESEARCH ARTICLE

A meta-analysis of the canopy light extinction coefficient in terrestrial ecosystems

Liangxia ZHANG^1,²,Zhongmin HU^1,^*(

),Jiangwen FAN^1,^*(

),Decheng ZHOU³,Fengpei TANG⁴

1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China
3. College of Urban and Environmental Sciences, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China
4. China University of Mining & Technology, Beijing 100083, China

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Abstract

The canopy light extinction coefficient (K) is a key factor in affecting ecosystem carbon, water, and energy processes. However, K is assumed as a constant in most biogeochemical models owing to lack of in-site measurements at diverse terrestrial ecosystems. In this study, by compiling data of K measured at 88 terrestrial ecosystems, we investigated the spatiotemporal variations of this index across main ecosystem types, including grassland, cropland, shrubland, broadleaf forest, and needleleaf forest. Our results indicated that the average K of all biome types during whole growing season was 0.56. However, this value in the peak growing season was 0.49, indicating a certain degree of seasonal variation. In addition, large variations in K exist within and among the plant functional types. Cropland had the highest value of K (0.62), followed by broadleaf forest (0.59), shrubland (0.56), grassland (0.50), and needleleaf forest (0.45). No significant spatial correlation was found between K and the major environmental factors, i.e., mean annual precipitation, mean annual temperature , and leaf area index (LAI). Intra-annually, significant negative correlations between K and seasonal changes in LAI were found in the natural ecosystems. In cropland, however, the temporal relationship was site-specific. The ecosystem type specific values of K and its temporal relationship with LAI observed in this study may contribute to improved modeling of global biogeochemical cycles.

Keywords canopy light extinction coefficient ecological modeling biogeochemical model forest grassland cropland leaf area index

Corresponding Author(s): Zhongmin HU

Online First Date: 03 June 2014 Issue Date: 13 January 2015

Cite this article:

Liangxia ZHANG,Zhongmin HU,Jiangwen FAN, et al. A meta-analysis of the canopy light extinction coefficient in terrestrial ecosystems[J]. Front. Earth Sci., 2014, 8(4): 599-609.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-014-0446-7
https://academic.hep.com.cn/fesci/EN/Y2014/V8/I4/599

Tab.1 Means±standard deviations of the canopy light extinction cofficient (K) during the whole growth season (K_mean) and at the peak growing season (K_pg) for each plant functional type (PFT). One-Way ANOVA was used to compare the difference among PFTs and a Paired-Sample T test was used to compare the difference between K_mean and K_pg at the 0.05 level.

Fig.1 Relationships between mean canopy light extinction coefficient in the growing season (K_mean) and (a) mean annual temperature (MAT), and (b) mean annual precipitation (MAP) for main plant functional types in terrestrial ecosystems. Each dot or circle in the figure indicates the value of one site. No significant correlation was found between K_mean and MAT or MAP.

Fig.2 Relationship between leaf area index at the peak growing season (LAI_max) and the canopy light extinction coefficient (K_pg) at the peak growing season for main plant functional type in terrestrial ecosystems. Each dot or circle in the figure indicates the value of one site. No significant correlation was found between K_pg and LAI_max .

Fig.3 Relationships between the canopy light extinction coefficient (K) and seasonal changes in leaf area indices (LAI) for three terrestrial plant functional types: (a) grassland, (b) shrubland, (c) needleleaf forest.

Fig.4 Relationships between K and seasonal changes in LAI for different crops. (a) Uncorrelated, (b) positively correlated, (c) negatively correlated.

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