本文選題：通徑分析 + 決策系數(shù)��； 參考：《中國(guó)農(nóng)業(yè)氣象》2017年04期

【摘要】：基于2011-2015年冬小麥農(nóng)田實(shí)測(cè)大型稱重式蒸滲儀數(shù)據(jù)及農(nóng)業(yè)氣象觀測(cè)數(shù)據(jù),分析不同時(shí)間尺度農(nóng)田蒸散量的分布特征,并利用通徑分析方法對(duì)各時(shí)間尺度農(nóng)田蒸散的影響因子進(jìn)行辨識(shí)。結(jié)果表明:(1)冬小麥開(kāi)花-乳熟期典型晴天小時(shí)尺度蒸散呈單峰變化,最大值為0.9~1.1mm·h~(-1),日累計(jì)蒸散量7.0~9.1mm·d~(-1);冬小麥全生育期多年平均蒸散總量為385.4mm,日平均蒸散量為2.6mm·d~(-1),最大日蒸散量11.0mm·d~(-1),變化趨勢(shì)為前期較低、后期較高;在生育期尺度,播種-返青期的蒸散速率較小,多年平均值為1.1mm·d~(-1),返青后,農(nóng)田蒸散速率加快,多年平均值為4.2mm·d~(-1)。(2)不同時(shí)間尺度蒸散變化的影響因子主要包括凈輻射(Rn)、飽和水汽壓差(VPD)、0cm地溫(T_(g0))、20cm土壤水分(SW20)。在小時(shí)尺度,VPD對(duì)典型晴天蒸散變化的直接作用最大,其次為Rn,T_(g0)通過(guò)Rn路徑對(duì)EThourly變化產(chǎn)生間接影響,對(duì)蒸散的綜合決定能力排序依次為VPDT_(g0)Rn;在日尺度,Rn作為最關(guān)鍵的影響因子,對(duì)蒸散的直接影響最大,VPD對(duì)蒸散的間接影響最大,VPD、T_(g0)主要通過(guò)Rn路徑間接影響蒸散,SW20再通過(guò)T_(g0)路徑間接影響蒸散且為負(fù)效應(yīng),各因子決策系數(shù)排序依次為RnVPDT_(g0)SW20;在生育期尺度,T_(g0)和Rn是驅(qū)動(dòng)蒸散變化的最主要因子并起直接影響作用,決策系數(shù)表明T_(g0)對(duì)蒸散變化的促進(jìn)作用比Rn明顯。
[Abstract]:Based on the data of measured large weighing lysimeter and agrometeorological observation data of 2011-2015 years of winter wheat field, the distribution characteristics of the evapotranspiration in different time scales were analyzed, and the influence factors of the evapotranspiration in each time scale were identified by means of path analysis. The results showed that: (1) the typical sunny hour ruler of the flowering and milk ripening period of Winter Wheat The maximum evapotranspiration is 0.9~1.1mm. H~ (-1), and the daily evapotranspiration is 7.0~9.1mm. D~ (-1). The average annual evapotranspiration of winter wheat is 385.4mm, the average daily evapotranspiration is 2.6mm. D~ (-1), the maximum daily evapotranspiration is 11.0mm. The trend is lower in the early stage and higher in the later period. The rate of dispersion is small, the average annual value is 1.1mm. D~ (-1). After returning to green, the evapotranspiration rate of farmland is quicker, the average value is 4.2mm. D~ (-1). (2) the influence factors of the variation of evapotranspiration in different time scales mainly include net radiation (Rn), saturated vapor pressure difference (VPD), 0cm ground temperature (T_ (G0)) and 20cm soil moisture. The direct effect of transformation is the largest, followed by Rn, T_ (G0) has an indirect effect on the change of EThourly through the Rn path. The order of the comprehensive determination of evapotranspiration is VPDT_ (G0) Rn in turn; in the daily scale, Rn is the most critical influence factor, and the direct influence on the evapotranspiration is the greatest. VPD has the greatest indirect effect on the evapotranspiration, VPD, and T_ mainly through the path indirect. The influence of evapotranspiration, SW20 and T_ (G0) path indirectly influenced the transpiration and negative effect. The order of factor decision coefficients of each factor was RnVPDT_ (G0) SW20, T_ (G0) and Rn were the main factors driving the change of evapotranspiration, and the decision coefficient showed that T_ (G0) promoted the Evapotranspiration to be more obvious than that of Rn.

【作者單位】： 南京信息工程大學(xué)氣象災(zāi)害教育部重點(diǎn)實(shí)驗(yàn)室/江蘇省農(nóng)業(yè)氣象重點(diǎn)實(shí)驗(yàn)室/氣象災(zāi)害預(yù)報(bào)預(yù)警與評(píng)估協(xié)同創(chuàng)新中心;中國(guó)科學(xué)院大學(xué);中國(guó)科學(xué)院地理科學(xué)與資源研究所生態(tài)系統(tǒng)網(wǎng)絡(luò)觀測(cè)與建模重點(diǎn)實(shí)驗(yàn)室;
【基金】：公益性行業(yè)(氣象)科研專項(xiàng)(GYHY201506001;GYHY201306046) 氣象災(zāi)害教育部重點(diǎn)實(shí)驗(yàn)室(南京信息工程大學(xué))開(kāi)放課題(KLME1415) 江蘇省農(nóng)業(yè)氣象重點(diǎn)實(shí)驗(yàn)室項(xiàng)目(KYQ1404)
【分類號(hào)】：S512.11;S161.4

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王笑影;農(nóng)田蒸散實(shí)測(cè)方法研究進(jìn)展[J];農(nóng)業(yè)系統(tǒng)科學(xué)與綜合研究;2004年01期

2 王朝華;農(nóng)田蒸散發(fā)量變化規(guī)律分析[J];水文;2005年03期

3 汪永欽;介紹一種農(nóng)田蒸散力的計(jì)算方法[J];氣象;1982年01期

4 李旭輝;國(guó)外農(nóng)田蒸散理論計(jì)算方法[J];力學(xué)進(jìn)展;1985年03期

5 陳文軍,周英;南京地區(qū)農(nóng)田蒸散初步研究[J];南京氣象學(xué)院學(xué)報(bào);1991年03期

6 謝傳寧,陳文軍,簡(jiǎn)慰民;微滴式農(nóng)田蒸散器的研制[J];南京氣象學(xué)院學(xué)報(bào);1993年02期

7 劉紹民,劉志輝,傅瑋東;作物農(nóng)田蒸散計(jì)算模型的研究[J];生態(tài)學(xué)雜志;1998年04期

8 周英，申雙和，，張紅衛(wèi);大氣穩(wěn)定度對(duì)農(nóng)田蒸散計(jì)算準(zhǔn)確性的影響[J];南京氣象學(xué)院學(xué)報(bào);1994年01期

9 楊必仁;渭北旱塬農(nóng)田蒸散規(guī)律初探[J];陜西氣象;1996年04期

10 周英;申雙和;;陜西涇陽(yáng)冬小麥農(nóng)田蒸散[J];中國(guó)農(nóng)業(yè)氣象;1992年03期

相關(guān)重要報(bào)紙文章 前1條

1 記者 龐永來(lái);隴中大地萬(wàn)畝作物喊渴有效降雨初步緩解旱情[N];定西日?qǐng)?bào);2009年

本文編號(hào)：1844507