【摘要】：【目的】研究傳統(tǒng)土壤全氮含量測(cè)定方法,解決復(fù)雜、耗時(shí)、耗力等問題�！痉椒ā恳孕陆珊祬^(qū)灰漠土為研究對(duì)象,運(yùn)用經(jīng)典統(tǒng)計(jì)學(xué)和光譜學(xué)相結(jié)合的方法,研究灰漠土土壤全氮含量的光譜反射特性,通過對(duì)原始光譜的數(shù)據(jù)變換和相關(guān)性分析,構(gòu)建了土壤全氮含量的高光譜估測(cè)模型,并對(duì)模型進(jìn)行對(duì)比和驗(yàn)證。【結(jié)果】土壤中全氮含量不同光譜反射特性趨勢(shì)相近,土壤的光譜反射率在780、1 800和2 140 nm波長附近出現(xiàn)波峰,在1 910 nm附近有明顯的波谷,土壤全氮含量與原始光譜反射率相關(guān)性較差。通過一階微分處理后的光譜數(shù)據(jù)與全氮含量的相關(guān)性顯著優(yōu)于原始光譜和二階微分處理,最大相關(guān)系數(shù)為0.819,達(dá)到極顯著相關(guān);利用一階微分變換從中提取特征波段667和1 414 nm,建立土壤全氮含量的估測(cè)模型:Y=2 698.048 X667-1062.149 X1414-0.015,R2為0.75,對(duì)估測(cè)模型進(jìn)行驗(yàn)證發(fā)現(xiàn),R2為0.80,當(dāng)全氮含量過大或過小時(shí),模型估測(cè)偏差相對(duì)較大,總體預(yù)測(cè)精度較高。【結(jié)論】高光譜分析技術(shù)對(duì)土壤全氮含量的預(yù)測(cè)具有一定的意義,利用估測(cè)模型可以快速鑒定土壤全氮含量。
[Abstract]:[objective] to study the traditional methods for the determination of total nitrogen in soil, and to solve the complex, time-consuming and labor-consuming problems. [methods] the grey desert soil in arid area of Xinjiang was used as the research object, and the combination of classical statistics and spectroscopy was used. The spectral reflectance characteristics of soil total nitrogen content in grey desert soil were studied. The hyperspectral estimation model of soil total nitrogen content was established through the data transformation and correlation analysis of the original spectrum. The model was compared and verified. [results] the trend of different spectral reflectance characteristics of soil total nitrogen content was similar, and the spectral reflectance of soil appeared wave peaks near the wavelength of 780,1800 and 2140 nm, and obvious troughs near the wavelength of 1,910 nm. The correlation between soil total nitrogen content and original spectral reflectance was poor. The correlation between the first order differential treatment and the total nitrogen content was significantly better than that of the original spectrum and the second order differential treatment, and the maximum correlation coefficient was 0.819, which was extremely significant. The estimation model of soil total nitrogen content was established by using the first order differential transform to extract characteristic bands 667,1 414 nm,. The results showed that the estimated R2 was 0.75. The result showed that R2 was 0.80. When the total nitrogen content was too large or too small, the estimation deviation of the model was relatively large. [conclusion] the high spectral analysis technique has certain significance in predicting soil total nitrogen content, and the estimation model can be used to quickly identify soil total nitrogen content.
【作者單位】： 石河子大學(xué)農(nóng)業(yè)資源與環(huán)境系;
【基金】：國際科技合作項(xiàng)目(2015DFA11660) 國家大學(xué)生創(chuàng)新創(chuàng)業(yè)訓(xùn)練計(jì)劃項(xiàng)目(201610759002) 石河子大學(xué)校級(jí)項(xiàng)目(RCZX201522,SRP2016012) Fund project:gray desert soil;total nitrogen content;hyperspectral inversion
【分類號(hào)】：S153.6

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