首页|Comparison of Extrapolation and Interpolation Methods for Estimating Daily Photosynthetically Active Radiation (PAR)——A Case Study of the Poyang Lake National Nature Reserve, China

Comparison of Extrapolation and Interpolation Methods for Estimating Daily Photosynthetically Active Radiation (PAR)——A Case Study of the Poyang Lake National Nature Reserve, China

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Measurements of photosynthetically active radiation (PAR), which are indispensable for simulating plant growth and productivity, are generally very scarce. This study aimed to compare two extrapolation and one interpolation methods for estimating daily PAR reaching the earth surface within the Poyang Lake national nature reserve, China. The daily global solar radiation records at Nanchang meteorological station and daily sunshine duration measurements at nine meteorological stations around Poyang Lake were obtained to achieve the objective. Two extrapolation methods of PARs using recorded and estimated global solar radiation at Nanchang station and three stations (Yongxiu, Xingzi and Duchang) near the nature reserve were carried out, respectively, and a spatial interpolation method combining triangulated irregular network (TIN) and inverse distance weighting (IDW) was implemented to estimate daily PAR. The performance evaluation of the three methods using the PARs measured at Dahuchi Conservation Station (day number of measurement = 105 days) revealed that: (1) the spatial interpolation method achieved the best PAR estimation (R2 = 0.89, s.e. = 0.99, F = 830.02, P ＜ 0.001＝; (2) the extrapolation method from Nanchang station obtained an unbiased result (R2 = 0.88, s.e. = 0.99, F = 745.29, P ＜ 0.001＝; however, (3) the extrapolation methods from Yongxiu, Xingzi and Duchang stations were not suitable for this specific site for their biased estimations. Considering the assumptions and principles supporting the extrapolation and interpolation methods, the authors conclude that the spatial interpolation method produces more reliable results than the extrapolation methods and holds the greatest potential in all tested methods, and more PAR measurements should be recorded to evaluate the seasonal, yearly and spatial stabilities of these models for their application to the whole nature reserve of Poyang Lake.

photosynthetically active radiation (PAR)extrapolationinterpolationtriangulated irregular network (TIN)inverse distance weighting (IDW)

WU Guofeng、Jan de Leeuw、Andrew K. Skidmore、LIU Yaolin、Herbert H. T. Prins

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School of Resource and Environmental Science, Wuhan University, 129 Luoyu Road, Wuhan 430079, China

Key Laboratory of Geographic Information System of the Ministry of Education, Wuhan University, 129 Luoyu Road,Wuhan 430079, China

International Livestock Research Institute (ILRI), P. O. Box 30709, Nairobi 00100, Kenya

Department of Natural Resources, International Institute for Geo-Information Science and Earth Observation, P. O. Box 6,Hengelosestraat 99, 7500 AA Enschede, the Netherlands

Resource Ecology Group, Department of Environmental Sciences, Wageningen University, Droevendaalsesteeg 3A 6708 PB Wageningen, the Netherlands

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国家自然科学基金Scientific Research Starting Foundation of Ministry of Education of China for Returned Overseas Chinese ScholarsSpecial Foundation of Ministry of Finance of ChinaInternational Institute for Geo-information Science and Earth Observation (ITC),the Netherlands

40971191200904001

2010

10.1007/s11806-010-0372-0

地球空间信息科学学报(英文版)
武汉大学（原武汉测绘科技大学）

地球空间信息科学学报(英文版)

影响因子：0.207
ISSN：1009-5020
年,卷(期)：2010.13(4)
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