2001年度1号期刊97篇record1of50author(s)∶jacobs，afgvande(编辑修改稿)

2001年度1号期刊97篇record1of50author(s)∶jacobs，afgvande(编辑修改稿)内容摘要：

r and microtopography. (C) 2020 Elsevier Science . All rights reserved. Addresses: Uppsala Univ, Dept Earth Sci Hydrol, SE75236 Uppsala, Sweden Reprint Address: Kellner, E, Uppsala Univ, Dept Earth Sci Hydrol, Villavagen 16, SE75236 Uppsala, Sweden. Cited References: *SMHI, 1996, VAD VATT VAD 1996. BLANKEN PD, 1996, J APPL ECOL, V33, P842. BUBIER JL, 1994, TRENDS ECOL EVOL, V9, P460. COMER NT, 2020, ATMOS OCEAN, V38, P161. DENHARTOG G, 1994, J GEOPHYS RES, V99, P1539. DEVRIES DA, 1975, HEAT MASS TRANSFER 1, P5. EUGSTER W, 2020, GLOB CHANGE BIOL S1, V6, P84. FAROUKI OT, 1986, GERMANY SERIES ROCK, V11. FINNIGAN JJ, 1987, STOMATAL FUNCTION, P385. FRENZEL P, 2020, BIOGEOCHEMISTRY, V51, P91. FROLKING S, 1994, GLOBAL BIOGEOCHEM CY, V8, P385. GRANBERG G, 1999, WATER RESOUR RES, V35, P3771. HALLDIN S, 1998, J HYDROL, V212, P172. HALLDIN S, 1999, AGR FOREST METEOROL, V98, P5. HALLDIN S, 1999, AGR FOREST METEOROL, V98, P75. HALLIWELL DH, 1987, J CLIMATOL, V7, P571. 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Source Item Page Count: 23 Subject Category: Agronomy。 Forestry。 Meteorology amp。 Atmospheric Sciences ISI Document Delivery No.: 512PX Record 4 of 50 Author(s): Leblanc, SG。 Chen, JM Title: A practical scheme for correcting multiple scattering effects on optical LAI measurements Source: AGRICULTURAL AND FOREST METEOROLOGY, 110 (2): 125139 DEC 27 2020 Language: English Document Type: Article Author Keywords: multiple scattering effect。 leaf area index。 larose forest。 plant canopies Keywords Plus: LEAFAREAINDEX。 STANDS。 ARCHITECTURE。 REFLECTANCE。 CONIFER。 GROWTH Abstract: Accurate and fast nondestructive measurements of leaf area index (LAI) of plant canopies are essential to environmental applications such as water and carbon cycle modelling. A monly used technique to acquire LAI in situ is based on measurements of radiation transmittance through the canopy with optical instruments. The LAI2020, that obtains measurements of effective LAI (Le: LAI retrieved assuming random foliage distribution) based on gap fraction at five view angles, is designed to work under diffuse light conditions. The LAI2020 makes use of blue light to minimise the effect of light scattering in the canopy on LAI measurements. However, actual field LAI measurements are still routinely done under a range of illumination conditions, including direct sunlight. The LAI values measured under conditions of either partial or full direct light are generally smaller than the ones obtained under diffuse conditions. Although this error source is prevailing in many field LAI measurements, hitherto the problem has not been tackled rigorously. To better understand and improve the LAI2020 measurements taken under nonideal conditions, measurements were taken in two deciduous and two coniferous forest sites at different times of cloudless days to study how the scattering of the blue light by plant canopies affects LAI measurements. The sites are located in Larose forest near Ottawa, Canada. It is shown through these measurements and modelling with the canopy radiative transfer model Fivescale [Remote Sens. Rev. 19 (2020) 293305] that the blue light scattering causes underestimation of effective LAI by up to 20% when measured under direct sunlight. A correction for the scattering effect, as a function of solar zenith angle and the effective LAI measured under the sunlit condition, is found through an empirical fit to the measured data in a limited range as well as modelsimulated data in the full possible range possible. It is also found that the LAI2020 fourth ring (4758degrees from zenith) gives a more consistent correction than the other rings and that this ring used alone is also suitable for effective LAI retrieval under diffuse conditions. The correction scheme can reduce the error in effective LAI measurements to。