A study on the variations of pivotal photosynthetic active radiation parameters of a Leymus chinensis meadow-steppe in Hulunber

Abstract

Abstract: The diurnal and seasonal variations of photosynthetic active radiation (PAR) parameters, the calculation of reflectance of canopy and transmittance of soil in a Leymus chinensis meadow-steppe in Hulunber were studied. The seasonal variations of both PAR and absorbed photosynthesis active radiation (APAR) tended to decrease in the growth period from early June to late September. PAR fluctuated over a wider range (25 and 58 mol/m²) than APAR (17 and 34 mol/m²). However, the fraction of photosynthetic active radiation (FPAR) tended to increase during the season. It fluctuated between 0.46 and 0.77 with the highest FPAR value of 0.77 in the last ten days of August. Changes of incident PAR, reflectance PAR, and transmittance PAR of the canopy and the soil reflectance PAR during clear days were standard sine curves. The diurnal variation of canopy reflectance ratio was highest in the morning and evening but lowest around 12:00 noon. The diurnal change (0.4) of the reflectance ratio of soil varied over a wider range in June than in July and September (0.08). The diurnal variation of APAR was identical with the incident PAR. The diurnal FPAR variation was a curve of cosine on clear days in June, July, and the middle of August, with a variation of 0.60, compared with a variation of only 0.13 in September. The relative correct PAR data were obtained by measuring on the ground as well as FPAR and it provided a reference for the evaluation of precision and validation of FPAR in grassland.

CLC Number:

Q945.11
S812

LI Jin, ZHANG De-gang, ZHANG Hong-bin, LI Gang, YANG Gui-xia, LI Lin-zhi, XIN Xiao-ping. A study on the variations of pivotal photosynthetic active radiation parameters of a Leymus chinensis meadow-steppe in Hulunber[J]. Acta Prataculturae Sinica, 2010, 19(4): 243-250.

References

[1] 何洪林, 于贵瑞, 牛栋. 复杂地形条件下的太阳资源辐射计算方法研究[J]. 资源科学, 2003, 25(1): 78-85.
[2] Podesta G P, Nunez L, Villanueva, et al. Estimating daily solar radiation in the Argentine Pampas[J]. Agricultural and Forest Meteorology, 2004, 123(1-2): 41-53.
[3] 张运林, 秦伯强. 太湖地区光合有效辐射(PAR)的基本特征及其气候学计算[J]. 太阳能学报, 2002, 23(1): 118-123.
[4] 周允华, 项月琴, 左大康. 地球表层辐射平衡研究[M]. 北京: 科学出版社, 1991.
[5] Li Z, Moreau L, Cihlar J. Estimation of photosynthetically active radiation absorbed at the surface[J]. Journal of Geophysica Research, 1997, 102(24): 29717-29727.
[6] Asrar G, Fuchs M, Kanemasu E T, et al. Estimating absorbed photosynthetic radiation and leaf area index from spectral reflectance in wheat[J]. Agronomy Journal, 1984, 76: 300-306.
[7] Roujean J L, Breon E M. Estimating PAR absorbed by vegetation from bi-directional reflectance measurements[J]. Remote Sensing of Environment, 1995, 51: 375-384.
[8] Ridao E, Conde J R, Mínguez M I. Estimating FAPAR from nine vegetation indices for irrigated and nonirrigated faba soybean and semileafless pea canopies[J]. Remote Sensing of Environment, 1998, 66: 87-100.
[9] Tian Y H, Dickinson R E, Zhou L, et al. Comparison of seasonal and spatial variations of leaf area index and fraction of absorbed photosynthetically active radiation from moderate resolution imaging spectraradiometer (MODIS) and common land model[J]. Journal of Geophysical Research, 2004, 109: 1103.
[10] Fensholt R, Sandholt I, Rasmussen M S. Evaluation of MODIS LAI, FAPAR and the relation between FAPAR and NDVI in a semi-arid environment using in situ measurements[J]. Remote Sensing of Environment, 2004, 91: 490-507.
[11] Goward S N, Huemmrich K F. Vegetation canopy PAR absorptance and the normalized difference vegetation index: An assessment using the SAIL model[J]. Remote Sensing of Environment, 1992, 39: 119-140.
[12] Huemmrich K F, Goward S N. Vegetation canopy PAR absorptance and NDVI: An assessment for ten tree species with the SAIL model[J]. Remote Sensing of Environment, 1997, 61: 254-269.
[13] Knyazikhin Y, Kranigk J, Myneni R B, et al. Influence of small-scale structure on radiative transfer and photosynthesis in vegetation cover[J]. Journal of Geophysical Research, 1998, 103: 6133-6144.
[14] 刘洪顺. PAR的观测和计算[J]. 气象, 1980, 6: 5-6.
[15] 董振国, 于沪宁. 农田PAR观测与分析[J]. 气象, 1983, (7): 23-24.
[16] 周允华, 项月琴, 左大康. 地球表层辐射平衡研究[M]. 北京: 科学出版社, 1991.
[17] 周晓东, 朱启疆, 王锦地, 等. 夏玉米冠层内PAR截获及FPAR与LAI的关系[J]. 自然资源学报, 2002, 17(1): 110-116.
[18] 王培娟, 朱启疆, 吴门新, 等. 冬小麦冠层的FAPAR、LAI、VIs之间关系的研究[J]. 遥感信息, 2003, (3): 19-22.
[19] 刘荣高, 刘纪远, 庄大方. 基于MODIS数据估算晴空陆地光合有效辐射[J]. 地理学报, 2004, 59(1): 65-73.
[20] 张佳华, 符淙斌. 生物量估测模型中遥感信息与植被光合参数的关系研究[J]. 测绘学报, 1999, 27(2): 128-132.
[21] 江东, 王乃斌, 杨小唤, 等. 吸收光合有效辐射的时序变化特征及与作物产量的响应关系[J]. 农业系统科学与综合研究, 2002, 18(1): 51-54.
[22] 杨飞, 张柏, 李凤秀, 等. 大豆和玉米冠层光合有效辐射各分量日变化[J]. 生态学杂志, 2007, 26(8): 1153-1158.
[23] Churkina G, Running S W. Contrasting climatic controls on the estimated productivity of global, terrestrial biomes[J]. Ecosystems, 1998, 1: 206-215.
[24] Sellers P J, Collatz G J. A revised land surface parameterization (SiB2) for atmospheric GCMS: I. Model formulation[J]. Journal of Climate, 1996, 9: 676-705.
[25] Lobell D B, Asner G P, Ortiz-Monasterio J I, et al. Remote sensing of regional crop production in the Yaqui Valley, Mexico: Estimates and uncertainties[J]. Agriculture Ecosystems & Environment, 2003, 94: 205-220.
[26] Qi J, Kerr Y H, Moran M S, et al. Leaf area index estimates using remotely sensed data and BRDF models in a semi-arid region[J]. Remote Sensing of Environment, 2000, 73: 18-30.
[27] 高志强, 刘纪远. 基于遥感和GIS的中国植被指数变化的驱动因子分析及模型研究[J]. 气候与环境研究, 2000, 5(2): 155-164.
[28] Morisette J T, Privette J L, Justice C O. A framework for the validation of MODIS land products[J]. Remote Sensing of Environment, 2002, 83: 77-90.
[29] Huemmrich K F, Privette J L, Mukelabai M, et al. Time-series validation of MODIS land biophysical products in a Kalahari Woodland, Africa[J]. International Journal of Remote Sensing, 2005, 26(19): 4381-4398.
[30] Potter C S, Randerson J T, Field C B, et al. Terrestrial ecosystem production: A process model based on globe satellite and surface data[J]. Global Biogeochemical Cycles, 1993, 7: 811-841.
[31] Xiao X, Zhang Q, Braswell B, et al. Modeling gross primary production of temperate deciduous broadleaf forest using satellite images and climate data[J]. Remote Sensing Environment, 2004, 91: 256-270.
[32] 赵有益, 龙瑞军, 林慧龙, 等. 草地生态系统安全及其评价研究[J]. 草业学报, 2008, 17(2): 143-150.
[33] 王俊明, 张兴昌. 退耕草地演替过程中的碳储量变化[J]. 草业学报, 2009, 18(1): 1-8.
[34] Yang W Z, Huang D, Tan B, et al. Analysis of leaf area index and fraction of PAR absorbed by vegetation products from the terra MODIS sensor: 2000-2005[J]. IEEE Transactions on Geoscience and Remote Sensing, 2006, 44(7): 1829-1842.
[35] Hu J N, Su Y, Tan B, et al. Analysis of the MISR LAI/FPAR product for spatial and temporal coverage, accuracy and consistency[J]. Remote Sensing of Environment, 2007, 107: 334-347.
[36] 黄黔. 我国的生态建设与生态现代化[J]. 草业学报, 2008, 17(2): 1-8.
[37] Gallo K P, Daughtry C S T. Techniques for measuring intercepted and absorbed photosynthetically active radiation in corn canopies[J]. Agronomy Journal, 1986, 78: 752-756.