干旱区山地草原叶绿素含量高光谱反演研究

项目名称： 干旱区山地草原叶绿素含量高光谱反演研究

项目编号： No.31460625

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 林学

项目作者： 郑逢令

作者单位： 新疆畜牧科学院

项目金额： 45万元

中文摘要： 干旱区天然草原不仅具有重要的生态功能，而且提供大量饲草资源，为更好的监测和管理天然草原，必须要及时掌握草原的数量和质量动态。在前期的野外实地调查和光谱采集过程中我们发现，干旱区天然草地具有不同的类型和植被种类组合、植被覆盖度低、异质性很强。不同植被种类组合的样地冠层光谱特征差异很大，土壤背景对冠层光谱有重要影响，如何反演天然草地的生理生化参量是一个挑战。本次研究拟选择新疆天山北坡中段山地草原，从叶片和冠层水平，在不同生育期对近地高光谱数据和叶绿素含量进行采集和分析的基础上，运用经验统计模型和基于辐射传输理论的PROSAIL模型反演叶绿素含量，通过分析和比较各模型与实测值的拟合精度，进行验证和误差分析、评价。探索在干旱区山地草原通过高光谱反演叶绿素含量研究中，怎样更好的去除土壤背景噪声，在物种多样的异质性条件下，获得一个精度合乎要求的反演模型，更好的服务于草地生态监测和畜牧业生产。

中文关键词： 山地草原；叶绿素；高光谱；干旱区

英文摘要： Grassland in arid region has important ecological functions,it also provides a lot of forage resource.for better monitoring and management of grassland,we must conduct the dynamic monitoring of the quantity and quality of grassland. In the field investigation and spectral acquisition process , we found that the grassland in arid region note for its different types,species combinations , low vegetation coverage,strong heterogeneity.plots with different species combinations have diverse canopy spectral characteristics,the soil background have a marked impact on the canpony spectral,it is a challenge to inverse the biophysical and biochemical parameters of grassland.our study area locate in mountain grassland of middle section of the northern slope of Tianshan Mountain,from the leaves and canopy levels,in different growth stages of plant, Hyperspectral Data and chlorophyll content plan to be collected and analysed, empirical statistical model and PROSAIL that based on the theory of radiative transfer are going to be utilize for inversion the chlorophyll content of grassland plant, through analysis and fitting accuracy of each model and comparing the measured values , validation , error analysis ,evaluation.aims to learn how to get rid of the soil backgraound noise in the research of chlorophyll content retrival of mountain grasslands in arid region research chlorophyll content retrieval by hyperspectral ,and in a variety of species heterogeneity conditions , how to get a desirable accuracy inversion model.our goal is to serve the needs of ecological monitoring of grassland and animal husbandry production.

英文关键词： Mountain grassland;Chlorophyll;Hyperspectral;Arid region