基于多时相Landsat 8数据对临安西部山核桃受干旱胁迫程度的监测研究

发布时间：2018-03-08 00:36

本文选题：Landsat　切入点：8　出处：《浙江农林大学》2015年硕士论文　论文类型：学位论文

【摘要】：山核桃是临安农村经济的主导产业之一。然而,2013年高温干旱对山核桃产量和山核桃林可持续经营造成威胁。因此,如何快速有效监测山核桃胁迫程度,对政府制定抗旱对策、农民做好旱后补救具有重大意义。针对2013年夏季高温引起的干旱,本文选择浙江省临安市西部作为研究区,基于2013年7月,2013年10月和2013年12月三期Landsat 8 OLI数据,利用线性混合像元分解技术获取植被,阴影和土壤分量。利用三个分量构建归一化多分量指数和植被-土壤比值指数分别用于山核桃空间分布提取和干旱监测,主要结果如下:1.基于山核桃种植特征,线性混合像元分解后山核桃土壤分量值显著比其它落叶阔叶林高,植被、阴影分量较低,构建归一化多分量指数提取山核桃空间分布信息,其总体精度达88.67%,Kappa系数为0.76;2.各分量能有效地反映山核桃干旱前后变化。2013年10月(干旱后)山核桃植被分量减少,土壤分量增加,显著不同于2013年7月(干旱前),利用植被和土壤分量构建植被-土壤比值指数有效监测干旱胁迫程度,划分阈值,将山核桃划分为重度干旱、中等干旱、轻度干旱和无旱,以获得山核桃干旱等级分布图。
[Abstract]:Pecan is one of the leading industries in Linan rural economy. However, the high temperature and drought in 2013 posed a threat to the yield of pecan and the sustainable management of pecan forest. It is of great significance for farmers to remedy drought after drought. In view of drought caused by high temperature in December 2013 summer, this paper selects the west of Linan City, Zhejiang Province as the research area, based on the three issues of Landsat 8 OLI data: July 2013, October 2013 and December 2013. The vegetation, shadow and soil components were obtained by linear mixed pixel decomposition, and normalized multicomponent index and vegetation-soil ratio index were constructed for extracting spatial distribution and drought monitoring of pecan, respectively. The main results were as follows: 1. Based on the planting characteristics of pecan, the soil component value of pecan was significantly higher than that of other deciduous broad-leaved forests after linear mixed pixel decomposition, and the vegetation and shadow components were lower than those of other deciduous broad-leaved forests. The normalized multicomponent index was constructed to extract the spatial distribution information of pecan. The overall accuracy was 88.67 and Kappa coefficient was 0.76 ~ 2. Each component could effectively reflect the change of pecan before and after drought. In October 2013 (after drought), the vegetation component of pecan decreased, the soil component increased. Significantly different from July 2013 (before drought, vegetation and soil components were used to construct vegetation-soil ratio index to effectively monitor the degree of drought stress, divide the threshold, and divide pecan into severe drought, moderate drought, mild drought and no drought. To obtain the map of drought grade distribution of pecan.
【学位授予单位】：浙江农林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S664.1;S423

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