收稿：2018-08-15，
纸质出版：2020-06-07
移动端阅览
随机辐射传输模型可用于模拟水平分布不均一森林的辐射传输过程。本文以云南松林分为研究对象，提出一种应用随机辐射传输模型的郁闭度反演方法。该方法以随机辐射传输模型中参数与林分郁闭度的定量关系为基础，提出了针对云南松的冠型等效模型，构建了郁闭度和卫星反射率（GF-1和Landsat 8卫星影像）的查找表，并实施了反演。基于野外实测的30个样地进行了郁闭度数据验证，并和基于NDVI回归模型的反演方法进行对比。结果表明，反演结果能够较准确反映云南松林分郁闭状况（
R
2
=0.8345，RMSE=0.0688），通过冠型修正能够降低反演误差，冠型等效模型是合理的。反演方法机理清晰且适用范围广，研究成果可为大面积森林郁闭度反演提供模型和方法支持。
Remote sensing is an important method used to estimate forest canopy closure in large scale. The three kinds of remote sensing algorithms for canopy closure retrieval are statistical
physical
and mixed models. Although statistical models are commonly used
they lack physical explanation and are limited in local areas. Physical models have clear understanding on mechanism
which can be used in large areas. However
due to higher complexity
physical models are less applied. The Stochastic Radiative Transfer (SRT) model is applicable in simulating forests with horizontally distributed heterogeneity
which may represent different canopy closures. Exploring the inversion method using the SRT model could improve the efficiency and precision of canopy closure inversion.
On the basis of the SRT model
an inversion method has been proposed on canopy closure retrieval of Yunnan pine forests. The fundamental step is to determine the quantitative relationship between the canopy closure and the probability of finding foliage elements in SRT model. To match the Yunnan pine crown shape
an equivalent model was used to correct the cylinder shape assumption. Then
a look-up-table was constructed to inverse the canopy closure to obtain the reflectance from GF-1 and Landsat 8 satellite images. The probability of finding foliage elements and leaf area index were determined in the case of a minimum difference between simulated reflectance and satellite observations
and to calculate the canopy closure on the basis of the stochastic Beer–Lambert–Bouguer law. Thirty plots of field data were used to assess the inversion accuracy. A statistical inversion method based on NDVI was conducted for comparison.
Results showed that the inversion can accurately map the canopy closure of Yunnan pine forests in the study area (
R
2
=0.8345
RMSE=0.0688). Reflectance of the bands used for retrieval performed sensitively to canopy closure. The use of composite image from GF-1 and Landsat 8 is feasible. The equivalent shape correction model is reasonable
which reduced RMSE by 0.0466
and the algorithm is flexible in different crown cases.
This study can support forward models and inversion methods for large-scale forest canopy closure retrieval. The research could be extended to any tree species by changing the model parameter input
and any crown type by crown shape equivalent correction.
Bréda N J J . 2003 . Ground-based measurements of leaf area index: a review of methods, instruments and current controversies . Journal of Experimental Botany , 54 ( 392 ): 2403 - 2417 [ DOI: 10.1093/jxb/erg263 http://dx.doi.org/10.1093/jxb/erg263 ]
Dawson T P , Curran P J and Plummer S E . 1998 . LIBERTY—Modeling the effects of leaf biochemical concentration on reflectance spectra . Remote Sensing of Environment , 65 ( 1 ): 50 - 60 [ DOI: 10.1016/S0034-4257(98)00007-8 http://dx.doi.org/10.1016/S0034-4257(98)00007-8 ]
Demarez V , Duthoit S , Baret F , Weiss M and Dedieu G . 2008 . Estimation of leaf area and clumping indexes of crops with hemispherical photographs . Agricultural and Forest Meteorology , 148 ( 4 ): 644 - 655 [ DOI: 10.1016/j.agrformet.2007.11.015 http://dx.doi.org/10.1016/j.agrformet.2007.11.015 ]
Du X M , Cai T J and Ju C Y . 2008 . Estimation of forest canopy closure by using partial least square regression . Chinese Journal of Applied Ecology , 19 ( 2 ): 273 - 277
杜晓明 , 蔡体久 , 琚存勇 . 2008 . 采用偏最小二乘回归方法估测森林郁闭度 . 应用生态学报 , 19 ( 2 ): 273-277 [ DOI: 10.13287/j.1001-9332.2008.0110 http://dx.doi.org/10.13287/j.1001-9332.2008.0110 ]
Gonsamo A and Pellikka P . 2009 . A new look at top-of-canopy gap fraction measurements from high-resolution airborn imagery . EARSeL eProceedings , 8 : 64 - 74
Huang D , Knyazikhin Y , Wang W , Deering D , Stenberg P , Shabanov N , Tan B and Myneni R . 2008 . Stochastic transport theory for investigating the three-dimensional canopy structure from space measurements . Remote Sensing of Environment , 112 ( 1 ): 35 - 50 [ DOI: 10.1016/j.rse.2006.05.026 http://dx.doi.org/10.1016/j.rse.2006.05.026 ]
Li Q , Ma H C , Wu J W and Tian L Q . 2008 . Use of small-footprint scanning airborne LIDAR to estimate forest stand characteristics. Forest Resources Management, (1): 74 - 81 , 102
李奇 , 马洪超 , 邬建伟 , 田礼乔 . 2008 . 机载小光斑LIDAR的森林参数评估. 林业资源管理, (1): 74 - 81 , 102 [ DOI: 10.13466/j.cnki.lyzygl.2008.01.018 http://dx.doi.org/10.13466/j.cnki.lyzygl.2008.01.018 ]
Li Y N , Zhang B L , Qin S Y , Li S Y and Huang X R . 2008 . Review of research and application of forest canopy closure and its measuring methods . World Forestry Research , 21 ( 1 ): 40 - 46
李永宁 , 张宾兰 , 秦淑英 , 李帅英 , 黄选瑞 . 2008 . 郁闭度及其测定方法研究与应用 . 世界林业研究 , 21 ( 1 ): 40-46 [ DOI: 10.13348/j.cnki.sjlyyj.2008.01.006 http://dx.doi.org/10.13348/j.cnki.sjlyyj.2008.01.006 ]
Lin Q N , Huang H G , Chen L , Yu L F and Huang K . 2016 . Simulation of needle reflectance spectrum and sensitivity analysis of biochemical parameters of Pinus yunnanensis in different healthy status . Spectroscopy and Spectral Analysis , 36 ( 8 ): 2538 - 2545
林起楠 , 黄华国 , 陈玲 , 俞琳锋 , 黄侃 . 2016 . 不同病虫害危害程度下云南松针叶光谱模拟及其生化参数敏感性分析 . 光谱学与光谱分析 , 36 ( 8 ): 2538-2545 ) [ DOI: 10.3964/j.issn.1000-0593(201608-2538-08 http://dx.doi.org/10.3964/j.issn.1000-0593(2016)08-2538-08 ]
Liu Q H , Cao B , Zeng Y L , Li J , Du Y M , Wen J G , Fan W L , Zhao J and Yang L . 2016 . Recent progresses on the remote sensing radiative transfer modeling over heterogeneous vegetation canopy . Journal of Remote Sensing , 20 ( 5 ): 933 - 945
柳钦火 , 曹彪 , 曾也鲁 , 李静 , 杜永明 , 闻建光 , 范渭亮 , 赵静 , 杨乐 . 2016 . 植被遥感辐射传输建模中的异质性研究进展 . 遥感学报 , 20 ( 5 ): 933-945 [ DOI: 10.11834/jrs.20166280 http://dx.doi.org/10.11834/jrs.20166280 ]
Ning K . 2014 . Forest Canopy Density Evaluation in the Mountain Areas based on SAR Images . Chengdu : Southwest Jiaotong University : 77
宁凯 . 2014 . 基于SAR影像反演山区森林郁闭度的方法研究 . 成都 : 西南交通大学 : 77
Pu R , Xu B and Gong P . 2003 . Oakwood crown closure estimation by unmixing Landsat TM data . International Journal of Remote Sensing , 24 ( 22 ): 4422 - 4445 [ DOI: 10.1080/0143116031000095989 http://dx.doi.org/10.1080/0143116031000095989 ]
Shabanov N V , Huang D , Knjazikhin Y , Dickinson R E and Myneni R B . 2007 . Stochastic radiative transfer model for mixture of discontinuous vegetation canopies . Journal of Quantitative Spectroscopy and Radiative Transfer , 107 ( 2 ): 236 - 262 [ DOI: 10.1016/j.jqsrt.2007.01.053 http://dx.doi.org/10.1016/j.jqsrt.2007.01.053 ]
Shabanov N V , Knyazikhin Y , Baret F and Myneni R B . 2000 . Stochastic modeling of radiation regime in discontinuous vegetation canopies . Remote Sensing of Environment , 74 ( 1 ): 125 - 144 [ DOI: 10.1016/S0034-4257(00)00128-0 http://dx.doi.org/10.1016/S0034-4257(00)00128-0 ]
Shabanov N V and Gastellu-Etchegorry J P . 2018 . The stochastic Beer–Lambert–Bouguer law for discontinuous vegetation canopies . Journal of Quantitative Spectroscopy and Radiative Transfer , 214 : 18 - 32 [ DOI: 10.1016/j.jqsrt.2018.04.021 http://dx.doi.org/10.1016/j.jqsrt.2018.04.021 ]
Vainikko G M . 1973a . The equation of mean radiance in broken cloudiness . Trudy MGK SSSR, Meteorological Investigations , 21 : 28 - 37 (in Russian)
Vainikko G M . 1973b . Transfer approach to the mean intensity of radiation in non-continuous clouds . Trudy MGK SSSR, Meteorological Investigations , 21 : 38 - 57 (in Russian)
Wang C , Du H Q , Zhou G M , Xu X J , Sun S B and Gao G L . 2015 . Retrieval of crown closure of moso bamboo forest using unmanned aerial vehicle (UAV) remotely sensed imagery based on geometric-optical model . Chinese Journal of Applied Ecology , 26 ( 5 ): 1501 - 1509
王聪 , 杜华强 , 周国模 , 徐小军 , 孙少波 , 高国龙 . 2015 . 基于几何光学模型的毛竹林郁闭度无人机遥感定量反演 . 应用生态学报 , 26 ( 5 ): 1501-1509 [ DOI: 10.13287/j.1001-9332.20150302.001 http://dx.doi.org/10.13287/j.1001-9332.20150302.001 ]
Wang R , Xing Y Q , Wang L H , You H T , Qiu S and Wang A J . 2015 . Estimating forest canopy cover by combining spaceborne ICESat-GLAS waveforms and multispectral Landsat-TM images . Chinese Journal of Applied Ecology , 26 ( 6 ): 1657 - 1664
王蕊 , 邢艳秋 , 王立海 , 尤号田 , 邱赛 , 王爱娟 . 2015 . 联合星载ICESat-GLAS波形与多光谱Landsat-TM影像的森林郁闭度估测 . 应用生态学报 , 26 ( 6 ): 1657-1664 [ DOI： 10.13287/j.1001-9332.20150331.005 http://dx.doi.org/10.13287/j.1001-9332.20150331.005 ]
Wu Y , Zhang D R , Zhang H K and Wu H G . 2012 . Remote sensing estimation of forest canopy density combined with texture features . Scientia Silvae Sinicae , 48 ( 2 ): 48 - 53
吴飏 , 张登荣 , 张汉奎 , 武红敢 . 2012 . 结合图像纹理特征的森林郁闭度遥感估测 . 林业科学 , 48 ( 2 ): 48-53 [ DOI: 10.11707/j.1001-7488.20120207 http://dx.doi.org/10.11707/j.1001-7488.20120207 ]
Yu L F , Huang J X , Zong S X , Huang H G and Luo Y Q . 2018 . Detecting shoot beetle damage on Yunnan pine using Landsat time-series data . Forests , 9 ( 1 ): 39 - 52 [ DOI: 10.3390/f9010039 http://dx.doi.org/10.3390/f9010039 ]
Zeng Y , Schaepman M , Wu B , Clevers J and Bregt A . 2008 . Scaling-based forest structural change detection using an inverted geometric-optical model in the Three Gorges region of China . Remote Sensing of Environment , 112 ( 12 ): 4261 - 4271 [ DOI: 10.1016/j.rse.2008.07.007 http://dx.doi.org/10.1016/j.rse.2008.07.007 ]
Zheng D M , Zeng W S , Zhi C G and Shi P C . 2013 . Remote sensing estimation of forest canopy closure in forests of Three Gorges Reservoir Region . Journal of Central South University of Forestry and Technology , 33 ( 9 ): 1 - 4, 26
郑冬梅 , 曾伟生 , 智长贵 , 施鹏程 . 2013 . 三峡库区森林郁闭度的遥感定量估测 . 中南林业科技大学学报 , 33 ( 9 ): 1 - 4 , 26 [ DOI: 10.14067/j.cnki.1673-923x.2013.09.012 http://dx.doi.org/10.14067/j.cnki.1673-923x.2013.09.012 ]
相关作者
相关机构
京公网安备11010802024621
