The Comparison and Dynamic Calibration between the LAI Values of a Larix principis-rupprechtii Plantation Determined by Canopy Scanner and Litter-fall Collection

HAO Jia; XIONG Wei; WANG Yan-hui; YU Peng-tao; LIU Yan-hui; XU Li-hong; WANG Yi-hao; ZHANG Xiao-bei

Volume 25 Issue 2

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The Comparison and Dynamic Calibration between the LAI Values of a Larix principis-rupprechtii Plantation Determined by Canopy Scanner and Litter-fall Collection

1.
Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
2.
Forestry College, Agricultural University of Hebei, Baoding 071000, Hebei, China

Received Date: 2011-08-21

Abstract

In order to test the accuracy of the usually-used fixed calibration factor of the canopy scanner of LAI-2000 for measuring the leaf area index (LAI), a Larix principis-rupprechtii plantation was chosen in the small watershed of Xiangshuihe located at the Liupan Mountains of Ningxia Hui Autonomous Region of NW China, the LAI was measured in October 2010, a period from full canopy to the total fall of needles, by using both the LAI-2000 and litter-fall collection method. Then, a comparison was made between the LAI values determined by the litter-fall collection and that calculated based on the figures read from LAI-2000 and the fixed calibration factor (1.49). It showed that the average of LAI measurements of the 2 methods was very close, with a difference of only 5%. However, the calculated LAI from LAI-2000 was obviously higher than the true values determined by litter-fall collection when the canopy was full of needles; and obviously lower than the true value when the canopy was sparse after needle falling. The reason may be that LAI-2000 takes the projection of twigs as needles. So, a dynamic calibration factor is needed, especially in the seasons when the needle amount and the percentage of twigs projection in crown projection change quickly. Therefore, a statistic relation in a quadratic polynomial form between the 2 series of LAI data was well fitted. This relation can be used for a more accurate estimation of LAI based on the data read from the easily-used canopy scanners like LAI-2000.
- Larix principis-ruprechitee,
- leaf and index,
- LAI-2000,
- litter-fall collection,
- calibration factor

References

[2] Nackaerts K, Coppin P, Muys B, et al. Sampling methodology for LAI measurements with LAI-2000 in small forest stands [J]. Agricultural and Forest Meteorology, 2000, 101(4):247-250
[2]	Van Gardingen P R, Jackson G E, Hernandez-daumas S, et al. Leaf area index estimates obtained for clumped canopies using hemispherical photography [J]. Agricultural and Forest Meteorology, 1999, 94:243-257
[3] Sonnentag O, Talbot J, Chen J M, et al. Using direct and indirect measurements of leaf area index to characterize the shrub canopy in an ombrotrophic peatland [J]. Agricultural and Forest Meteorology, 2007, 144(3):200-212
[4] Chen J M, Cihlar J. Retrieving leaf area index of boreal conifer forests using Land sat TM images [J]. Remote Sensing of Environment, 1996, 55(2):153-162
[5] Lee K S, Cohen W B, Kennedy R E, et al. Hyperspectral versus multispectral data for estimating leaf area index in four different biomes [J]. Remote Sensing Environment, 2004, 91:508-520
[6] Asner G P, Scurlock J M O, Hicke J A. Global sythesis of leaf area index observation: Implications for ecological and remote sensing studies [J]. Globe Ecology and Biogeography, 2003, 12:191-205
[7] Zhang H Q, Chen Y R, Niu D. Retrieving effective leaf area index of conifer forests using Landsat TM images in red soil hilly region [J]. Acta Agricultuae University is Jiangxiensis, 2004, 26(2):159-163
[8] 王希群,马履一,贾忠奎,等. 叶面积指数的研究和应用进展[J]. 生态学杂志, 2005, 24(5):537-541
[9] Leblanc S G, Chen J M. Apractical scheme for correcting multiple scattering effects on optical LAI measurements [J]. Agricultural and Forest Meteorology, 2001, 110:125-139
[10]	[10] Nagler P L, Glenn E P, Thompson T L, et al. Leaf area index and normalized difference vegetation index as predictors of canopy characteristics and light interception by riparian species on the Lower Colorado River [J]. Agricultural and Forest Meteorology, 2004, 125:1-17
[11]	[11] Eriksson H, Eklundh L, Hall K, et al. Estimating LAI in deciduous forest stands [J]. Agricultural and Forest Meteorology, 2005, 129:27- 37
[12]	[12] Diao D X, Li C R, Guan C P. LAI and its dynamics of young red pine plantation [J]. Forestry Science and Technology, 2000, 25(4):16-17
[13]	[13] Xi J C, Zhang H Q, Zhang Z Q. Retrieving effective leaf area index of conifer forests using Landsat TM images [J]. Journal of Beijing Forestry University, 2004, 12(3):253-257
[14]	[14] Zhou Y Y, Tang S H, Zhu Q J, et al. Measurement of LAI in Changbai Mountains Nature Reserve and its result [J]. Resources Science, 2003, 25(6):38-42
[15]	[15] 席建超,张红旗,张志强. 应用遥感数据反演针叶林有效叶面积指数[J]. 北京林业大学学报, 2004, 26(6):36-39
[16]	[16] Barclay H J, Goodman D. Conversion of total to projected leaf area index in conifers [J]. Canadian Journal of Botany, 2000, 78(4):447-454
[17]	[17] 李轩然,刘琪,蔡哲,等. 千烟洲针叶林的比叶面积及叶面积指数[J]. 植物生态学报, 2007, 31(1):93-101
[18]	[18] Dovey S B, Du toit B. Calibration of LAI-2000 canopy analyzer with leaf area index in a young eucalypt stand [J]. Trees, 2006, 20:273-277
[19]	[19] Chen J M, Rich P M, Gower S T, et al. Leaf area index of boreal forests: theory, techniques and measurements [J]. Journal of Geophysical Research,1997, 102(24):29429-29433
[20]	[20] 熊伟,王彦辉,徐德应. 宁南山区华北落叶松人工林蒸腾耗水规律及其对环境因子的响应[J]. 林业科学, 2003, 39(2):2-7
[21]	[21] 陶洪斌,林杉.打孔称重法与复印称重法和长宽校正法测定水稻叶面积的方法比较[J]. 植物生理学通讯, 2006,42(3):496-498
[22]	[22] 柏军华,王克如,初振东,等. 叶面积测定方法的比较研究[J]. 石河子大学学报:自然科学版, 2005, 23(2):216-218
[23]	[23] 李家龙. 快速测算针叶面积的方法[J]. 林业科技通讯, 1985(10):封三
[24]	[24] 李轩然,刘琪璟,蔡哲,等. 湿地松林叶面积指数测算[J]. 生态学报, 2006, 26(12):4100-4105
[25]	[25] 刘立鑫,李凤日. 两种测定天然次生林叶面积指数方法的比较[J]. 森林工程, 2009, 25(3):44-47
[26]	[26] 杜春雨,范文义. 有效叶面积指数与真实叶面积指数的模型转换[J]. 东北林业大学学报, 2010, 38(7): 126-128
[27]	[27] 张继祥,魏钦平,张静,等. 利用冠层分析仪测算苹果园叶面积指数及其可靠性分析[J]. 园艺学报, 2010, 37(2):185-192
[28]

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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The Comparison and Dynamic Calibration between the LAI Values of a Larix principis-rupprechtii Plantation Determined by Canopy Scanner and Litter-fall Collection

1. Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China

2. Forestry College, Agricultural University of Hebei, Baoding 071000, Hebei, China

Received Date: 2011-08-21

Available Online: 2012-04-13

Abstract: In order to test the accuracy of the usually-used fixed calibration factor of the canopy scanner of LAI-2000 for measuring the leaf area index (LAI), a Larix principis-rupprechtii plantation was chosen in the small watershed of Xiangshuihe located at the Liupan Mountains of Ningxia Hui Autonomous Region of NW China, the LAI was measured in October 2010, a period from full canopy to the total fall of needles, by using both the LAI-2000 and litter-fall collection method. Then, a comparison was made between the LAI values determined by the litter-fall collection and that calculated based on the figures read from LAI-2000 and the fixed calibration factor (1.49). It showed that the average of LAI measurements of the 2 methods was very close, with a difference of only 5%. However, the calculated LAI from LAI-2000 was obviously higher than the true values determined by litter-fall collection when the canopy was full of needles; and obviously lower than the true value when the canopy was sparse after needle falling. The reason may be that LAI-2000 takes the projection of twigs as needles. So, a dynamic calibration factor is needed, especially in the seasons when the needle amount and the percentage of twigs projection in crown projection change quickly. Therefore, a statistic relation in a quadratic polynomial form between the 2 series of LAI data was well fitted. This relation can be used for a more accurate estimation of LAI based on the data read from the easily-used canopy scanners like LAI-2000.

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[1]	[2] Nackaerts K, Coppin P, Muys B, et al. Sampling methodology for LAI measurements with LAI-2000 in small forest stands [J]. Agricultural and Forest Meteorology, 2000, 101(4):247-250
[2]	Van Gardingen P R, Jackson G E, Hernandez-daumas S, et al. Leaf area index estimates obtained for clumped canopies using hemispherical photography [J]. Agricultural and Forest Meteorology, 1999, 94:243-257
[3]	[3] Sonnentag O, Talbot J, Chen J M, et al. Using direct and indirect measurements of leaf area index to characterize the shrub canopy in an ombrotrophic peatland [J]. Agricultural and Forest Meteorology, 2007, 144(3):200-212
[4]	[4] Chen J M, Cihlar J. Retrieving leaf area index of boreal conifer forests using Land sat TM images [J]. Remote Sensing of Environment, 1996, 55(2):153-162
[5]	[5] Lee K S, Cohen W B, Kennedy R E, et al. Hyperspectral versus multispectral data for estimating leaf area index in four different biomes [J]. Remote Sensing Environment, 2004, 91:508-520
[6]	[6] Asner G P, Scurlock J M O, Hicke J A. Global sythesis of leaf area index observation: Implications for ecological and remote sensing studies [J]. Globe Ecology and Biogeography, 2003, 12:191-205
[7]	[7] Zhang H Q, Chen Y R, Niu D. Retrieving effective leaf area index of conifer forests using Landsat TM images in red soil hilly region [J]. Acta Agricultuae University is Jiangxiensis, 2004, 26(2):159-163
[8]	[8] 王希群,马履一,贾忠奎,等. 叶面积指数的研究和应用进展[J]. 生态学杂志, 2005, 24(5):537-541
[9]	[9] Leblanc S G, Chen J M. Apractical scheme for correcting multiple scattering effects on optical LAI measurements [J]. Agricultural and Forest Meteorology, 2001, 110:125-139
[10]	[10] Nagler P L, Glenn E P, Thompson T L, et al. Leaf area index and normalized difference vegetation index as predictors of canopy characteristics and light interception by riparian species on the Lower Colorado River [J]. Agricultural and Forest Meteorology, 2004, 125:1-17
[11]	[11] Eriksson H, Eklundh L, Hall K, et al. Estimating LAI in deciduous forest stands [J]. Agricultural and Forest Meteorology, 2005, 129:27- 37
[12]	[12] Diao D X, Li C R, Guan C P. LAI and its dynamics of young red pine plantation [J]. Forestry Science and Technology, 2000, 25(4):16-17
[13]	[13] Xi J C, Zhang H Q, Zhang Z Q. Retrieving effective leaf area index of conifer forests using Landsat TM images [J]. Journal of Beijing Forestry University, 2004, 12(3):253-257
[14]	[14] Zhou Y Y, Tang S H, Zhu Q J, et al. Measurement of LAI in Changbai Mountains Nature Reserve and its result [J]. Resources Science, 2003, 25(6):38-42
[15]	[15] 席建超,张红旗,张志强. 应用遥感数据反演针叶林有效叶面积指数[J]. 北京林业大学学报, 2004, 26(6):36-39
[16]	[16] Barclay H J, Goodman D. Conversion of total to projected leaf area index in conifers [J]. Canadian Journal of Botany, 2000, 78(4):447-454
[17]	[17] 李轩然,刘琪,蔡哲,等. 千烟洲针叶林的比叶面积及叶面积指数[J]. 植物生态学报, 2007, 31(1):93-101
[18]	[18] Dovey S B, Du toit B. Calibration of LAI-2000 canopy analyzer with leaf area index in a young eucalypt stand [J]. Trees, 2006, 20:273-277
[19]	[19] Chen J M, Rich P M, Gower S T, et al. Leaf area index of boreal forests: theory, techniques and measurements [J]. Journal of Geophysical Research,1997, 102(24):29429-29433
[20]	[20] 熊伟,王彦辉,徐德应. 宁南山区华北落叶松人工林蒸腾耗水规律及其对环境因子的响应[J]. 林业科学, 2003, 39(2):2-7
[21]	[21] 陶洪斌,林杉.打孔称重法与复印称重法和长宽校正法测定水稻叶面积的方法比较[J]. 植物生理学通讯, 2006,42(3):496-498
[22]	[22] 柏军华,王克如,初振东,等. 叶面积测定方法的比较研究[J]. 石河子大学学报:自然科学版, 2005, 23(2):216-218
[23]	[23] 李家龙. 快速测算针叶面积的方法[J]. 林业科技通讯, 1985(10):封三
[24]	[24] 李轩然,刘琪璟,蔡哲,等. 湿地松林叶面积指数测算[J]. 生态学报, 2006, 26(12):4100-4105
[25]	[25] 刘立鑫,李凤日. 两种测定天然次生林叶面积指数方法的比较[J]. 森林工程, 2009, 25(3):44-47
[26]	[26] 杜春雨,范文义. 有效叶面积指数与真实叶面积指数的模型转换[J]. 东北林业大学学报, 2010, 38(7): 126-128
[27]	[27] 张继祥,魏钦平,张静,等. 利用冠层分析仪测算苹果园叶面积指数及其可靠性分析[J]. 园艺学报, 2010, 37(2):185-192
[28]

The Comparison and Dynamic Calibration between the LAI Values of a Larix principis-rupprechtii Plantation Determined by Canopy Scanner and Litter-fall Collection

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通讯作者: 陈斌, bchen63@163.com

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The Comparison and Dynamic Calibration between the LAI Values of a Larix principis-rupprechtii Plantation Determined by Canopy Scanner and Litter-fall Collection

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