- 相關(guān)推薦
重金屬污染水稻的冠層反射光譜特征研究
摘要：利用野外光譜儀獲取礦區(qū)農(nóng)田重金屬污染水稻的冠層反射光譜,通過(guò)曲線(xiàn)模擬和統(tǒng)計(jì)分析提取了與水稻冠層葉片重金屬含量變化極顯著相關(guān)的光譜敏感波段(Pb,460 nm;Zn,560 nm;Cu,660 mm;As,1 100 nm)、歸一化植被指數(shù)(Pb,NDVI_((510.810));Zn,NDVI_((510.870));Cu,NDVI_((660.870));As,NDVI_((510,810)))和紅邊位置等水稻冠層反射光譜特征.表明水稻重金屬污染可以被地面遙感傳感器快速榆測(cè),其濃度變化與所提取的光譜特征之間存在極顯著相關(guān),歸一化植被指數(shù)與紅邊位置對(duì)光譜信息的表達(dá)要優(yōu)于敏感波段.歸一化植被指數(shù)以及紅邊位置可以作為水稻重金屬污染遙感監(jiān)測(cè)模型的光譜特征參數(shù)選擇參考.同時(shí),文章提出了利用遙感技術(shù)監(jiān)測(cè)水稻重金屬污染的光譜臨界值概念,并計(jì)算出研究中各重金屬對(duì)應(yīng)的光譜臨界值.Abstract：Because of frequent mining,heavy metals are brought into environment like soils,water and atmosphere,resulting heavy metal contamination in the agricultural region beside mines.Heavy metals contamination causes vegetation stress like destruction of chloroplast structure,chlorophyll content decrease,blunt photosynthesis,etc.Spectral responses to changes in chlorophyll content and photosynthesis make it possible that remote sensing is applied in monitoring heavy metals stress on paddy plants.Field spectroradiometer was used to acquire canopy reflectance spectra of paddy plants contaminated by heavy metals released from local mining.The present study was conducted to(1)investigate discrimination of canopy reflectance spectra of heavy metal polluted and normal paddy plants;(2)extract spectral characteristics of contaminated paddy plants and compare them.By means of correlation analysis,sensitive bands(SB)were firstly picked out from canopy spectra.Secondly,on the basis of these sensitive bands,normalized difference vegetation indices(NDVI)were established,and then red edge position(REP)was extracted from canopy spectra via curve fitting of inverted Gaussian model.As a result of correlation analysis,460,560,660 and 1 100 nm were considered respectively as sensitive band for Pb,Zn,Cu and As concentration in paddy leaves.Furthermore,heavy metal concentrations(Pb,Zn,Cu and As)were significantly correlated with NDVIs(Pb,NDVI_((510,810));Zn,NDVI_((510,870));Cu,NDVI_((660,870));As,NDVI_((510,810)).Heavy metals were also significantly correlated with REP,however,the inflexion termed as spectral critical value(SCV)between low and high heavy metals concentrations should be considered during applying REP in remote sensing monitoring.Moreover,NDVI and REP are much better than SB in terms of capability of expressing spectral information.Therefore,heavy metals contamination in paddy plants can be remotely monitored v/a ground spectroradiometer when NDVI and REP are selected as spectral characteristics. 作者： 任紅艷[1]莊大方[2]潘劍君[3]史學(xué)正[1]施潤(rùn)和[4]王洪杰[1] Author： REN Hong-yan[1] ZHUANG Da-fang[2] PAN Jian-jun[3] SHI Xue-zheng[1] SHI Run-he[4] WANG Hong-jie[1] 作者單位： 中國(guó)科學(xué)院南京土壤研究所,土壤與農(nóng)業(yè)可持續(xù)發(fā)展國(guó)家重點(diǎn)實(shí)驗(yàn)室,江蘇,南京,210008中國(guó)科學(xué)院資源環(huán)境科學(xué)數(shù)據(jù)中心,北京,100101;南京農(nóng)業(yè)大學(xué)資源與環(huán)境科學(xué)學(xué)院,江蘇,南京,210095南京農(nóng)業(yè)大學(xué)資源與環(huán)境科學(xué)學(xué)院,江蘇,南京,210095華東師范大學(xué)教育部地理信息科學(xué)重點(diǎn)實(shí)驗(yàn)室,上海,200062 期 刊： 光譜學(xué)與光譜分析 ISTICEISCIPKU Journal： SPECTROSCOPY AND SPECTRAL ANALYSIS 年，卷(期)： 2010, 30(2) 分類(lèi)號(hào)： X87 關(guān)鍵詞： 重金屬 水稻 冠層反射 光譜特征 光譜臨界值 Keywords： Heavy metal Paddy Canopy reflectance Spectral characteristics Spectral critical value 機(jī)標(biāo)分類(lèi)號(hào)： S51 X53 機(jī)標(biāo)關(guān)鍵詞： 農(nóng)田重金屬污染 水稻冠層 冠層反射光譜 特征研究 Heavy Metals Canopy heavy metals NDVI 歸一化植被指數(shù) correlation analysis chlorophyll content canopy spectra remote sensing heavy metal contamination 光譜特征參數(shù) vegetation indices agricultural region 顯著相關(guān) 敏感波段 critical value 基金項(xiàng)目： 國(guó)家自然科學(xué)基金，中國(guó)博士后科學(xué)基金【重金屬污染水稻的冠層反射光譜特征研究】相關(guān)文章：
水稻葉片氣孔導(dǎo)度與冠層反射光譜的定量關(guān)系分析04-26
利用水稻冠層光譜特征診斷土壤氮素營(yíng)養(yǎng)狀況05-02
小麥葉片氮含量與冠層反射光譜指數(shù)的定量關(guān)系05-02
污灌區(qū)重金屬污染及其在水稻體內(nèi)的積累的研究04-26
鄂北TGM地區(qū)地震反射特征研究及有效儲(chǔ)層預(yù)測(cè)04-29
鎘污染水稻高光譜診斷分析與建模05-07
新型光譜曲線(xiàn)特征參數(shù)與水稻葉綠素含量間的關(guān)系研究05-07
地物反射波譜特征及高光譜成像遙感04-27