本文選題：Landsat　切入點(diǎn)：8　出處：《浙江農(nóng)林大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：山核桃是臨安農(nóng)村經(jīng)濟(jì)的主導(dǎo)產(chǎn)業(yè)之一。然而,2013年高溫干旱對山核桃產(chǎn)量和山核桃林可持續(xù)經(jīng)營造成威脅。因此,如何快速有效監(jiān)測山核桃脅迫程度,對政府制定抗旱對策、農(nóng)民做好旱后補(bǔ)救具有重大意義。針對2013年夏季高溫引起的干旱,本文選擇浙江省臨安市西部作為研究區(qū),基于2013年7月,2013年10月和2013年12月三期Landsat 8 OLI數(shù)據(jù),利用線性混合像元分解技術(shù)獲取植被,陰影和土壤分量。利用三個(gè)分量構(gòu)建歸一化多分量指數(shù)和植被-土壤比值指數(shù)分別用于山核桃空間分布提取和干旱監(jiān)測,主要結(jié)果如下:1.基于山核桃種植特征,線性混合像元分解后山核桃土壤分量值顯著比其它落葉闊葉林高,植被、陰影分量較低,構(gòu)建歸一化多分量指數(shù)提取山核桃空間分布信息,其總體精度達(dá)88.67%,Kappa系數(shù)為0.76;2.各分量能有效地反映山核桃干旱前后變化。2013年10月(干旱后)山核桃植被分量減少,土壤分量增加,顯著不同于2013年7月(干旱前),利用植被和土壤分量構(gòu)建植被-土壤比值指數(shù)有效監(jiān)測干旱脅迫程度,劃分閾值,將山核桃劃分為重度干旱、中等干旱、輕度干旱和無旱,以獲得山核桃干旱等級分布圖。
[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.
【學(xué)位授予單位】：浙江農(nóng)林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S664.1;S423

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本文編號：1581686