本文選題：冬小麥冠層　切入點(diǎn)：土壤表層濕度　出處：《光譜學(xué)與光譜分析》2017年05期 　論文類(lèi)型：期刊論文

【摘要】：為探究土壤表層濕度影響下冬小麥冠層光譜反射率響應(yīng)晚霜凍害的特征,并檢驗(yàn)敏感光譜波段預(yù)測(cè)小麥產(chǎn)量變化的能力,于2013和2014年小麥拔節(jié)期,分別設(shè)置了表層土壤含水量為10%(干)、10%~20%(中)和20%(濕)的三個(gè)濕度處理的凍前試驗(yàn),并在低溫室內(nèi)進(jìn)行降溫處理。分析了不同土壤表層濕度下受凍冬小麥的穗數(shù)、穗粒數(shù)、千粒重、單株產(chǎn)量、冠層光譜反射率及其一階微分值的差異,對(duì)冬小麥凍害產(chǎn)量變化率和高光譜特征參量進(jìn)行了相關(guān)分析和一元線(xiàn)性擬合。結(jié)果表明:冬小麥穗粒數(shù)和單株產(chǎn)量總體上均隨土壤表層濕度的降低而呈減少態(tài)勢(shì),在土壤表層干處理?xiàng)l件下凍害對(duì)冬小麥產(chǎn)量造成的影響最為顯著(p0.05);在綠峰(523nm附近)、黃邊(571nm附近)、紅邊(732nm附近)和近紅外臺(tái)的兩個(gè)水分吸收帶(952和1 145nm附近),干+凍害處理冬小麥冠層反射率的一階微分值與中+凍害、濕+凍害處理的差值明顯;剝離了土壤表層濕度對(duì)光譜的影響后,冬小麥冠層反射率一階微分差值在以570nm為中心的黃邊區(qū)域和以710nm為中心的紅邊區(qū)域?qū)Ω伞⒅泻蜐裉荻忍幚硐峦硭獌龊憫?yīng)的差異明顯;兩年試驗(yàn)中的黃邊面積(SDy)和570nm處一階微分值(d570)均與凍害產(chǎn)量變化率達(dá)到顯著正相關(guān)(p0.05),說(shuō)明黃邊區(qū)域的高光譜特征參量可用于檢測(cè)土壤表層濕度影響下的冬小麥晚霜凍害程度。本研究可為土壤表層濕度和晚霜凍害疊加影響下冬小麥產(chǎn)量變化預(yù)測(cè)方法的探討提供參考。
[Abstract]:In order to investigate the characteristics of canopy spectral reflectance of winter wheat under the influence of soil surface moisture, and to test the ability of sensitive spectral bands to predict wheat yield changes, wheat jointing stage was conducted in 2013 and 2014. The pre-freezing experiments of three humidity treatments with water content of 10 (dry) and 20 (wet) in the surface soil were carried out respectively, and the number of panicles, the number of kernels per ear, the weight of 1000 kernels of frozen winter wheat under different soil surface moisture were analyzed, and the results were as follows: (1) the number of grains per ear, the number of grains per ear, and the weight of 1000 grains in different soil layers were analyzed. Differences in yield per plant, spectral reflectivity of canopy and its first order microfraction, Correlation analysis of yield change rate and hyperspectral characteristic parameters of winter wheat was carried out. The results showed that grain number per spike and yield per plant decreased with the decrease of soil surface moisture. The effect of freezing injury on winter wheat yield was most significant under the condition of soil surface dry treatment, and dry near 952 and 1145 nm in the two water absorption zones of the near infrared station, I. e., the green peak (523nm), the yellow edge (571nm) and the red edge (732nm). The first order differential value and moderate freezing injury of canopy reflectance of winter wheat were treated by freezing injury. The difference value of wet freezing injury treatment was obvious, and the first order differential difference of canopy reflectance of winter wheat was dried in the yellow edge region with 570 nm as the center and the red edge region with 710 nm as the center after the effect of soil surface moisture on the spectrum was removed. The difference of response to late frost injury was obvious under neutralization and wet gradient treatment. SDY) and the first order differential value (d570) at 570 nm were significantly positively correlated with the yield change rate of freezing injury, indicating that the hyperspectral characteristic parameters in the Yellow River edge region can be used to detect winter wheat lateness under the influence of soil surface moisture. This study can be used as a reference for the prediction of winter wheat yield under the influence of soil surface moisture and late frost damage.
【作者單位】： 農(nóng)業(yè)部農(nóng)業(yè)環(huán)境重點(diǎn)實(shí)驗(yàn)室中國(guó)農(nóng)業(yè)科學(xué)院農(nóng)業(yè)環(huán)境與可持續(xù)發(fā)展研究所;商丘市農(nóng)林科學(xué)院小麥研究所;
【基金】：公益性行業(yè)(農(nóng)業(yè))科研專(zhuān)項(xiàng)(201503116) 國(guó)家自然科學(xué)基金青年科學(xué)基金項(xiàng)目(31101074,51109214)資助
【分類(lèi)號(hào)】：S425;S512.11

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