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Comparison of extrapolation and interpolation methods for estimating daily photosynthetically active radiation (PAR)

机译:外推法和内推法估算每日光合有效辐射(PAR)的比较

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摘要

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.
机译:光合有效辐射(PAR)的测量通常是非常稀缺的,这对于模拟植物的生长和生产力是必不可少的。本研究旨在比较两种外推方法和一种内推方法,以估算每天到达中国reaching阳湖国家级自然保护区内地表的PAR。取得了南昌市气象站的日全球日辐射记录和Po阳湖附近9个气象站的日照时长数据,以达到这一目的。在南昌站和自然保护区附近的三个站(永秀,星子和都昌)分别利用记录和估计的全球太阳辐射进行了两种外推法,并结合了三角不规则网(TIN)和反距离相结合的空间插值法实施加权(IDW)来估计每日PAR。使用在大湖池保护站测量的PAR的三种方法的性能评估(测量的天数= 105天)表明:(1)空间插值方法获得了最佳的PAR估计(R2 = 0.89,se = 0.99,F = 830.02,P <0.001); (2)南昌站的外推法得到无偏结果(R2 = 0.88,s.e. = 0.99,F = 745.29,P <0.001);然而,(3)永秀,星子和都昌台站的外推方法不适合该特定地点的估计。考虑到支持外推法和内插法的假设和原则,作者得出结论,空间内插法比外推法产生更可靠的结果,并且在所有测试方法中具有最大的潜力,应记录更多的PAR测量值以评估季节性,这些模型的年度和空间稳定性,可用于Po阳湖自然保护区。

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