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首页> 外文期刊>Australian Journal of Crop Science >Water vapour and carbon dioxide fluxes in sugarcane grown in megathermal humid climate in Northeastern Brazil
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Water vapour and carbon dioxide fluxes in sugarcane grown in megathermal humid climate in Northeastern Brazil

机译：巴西东北部高温潮湿气候中生长的甘蔗中的水蒸气和二氧化碳通量

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摘要

The understanding about biophysical processes taking place between the crop and the atmosphere is essential to define the appropriate management practices in order to increase crop yield. The aim of the present study is to analyze water vapour and carbon dioxide (CO 2 ) fluxes in sugarcane crop between the development and the mid-season as an environmental variables function, as well as to assess the correction effects on fluxes. Latent heat flux (?E) and net ecosystem CO 2 exchange (NEE) micrometeorological measurements were performed through the eddy covariance technique (EC), between June7th and November 17th, 2013 in a sugarcane crop grown in Northeastern Brazil. Days were characterized according to cloudiness conditions through the clearness index (Kt). The ?E and NEE, set through the EC technique, needed correction due to heat and water vapour transfer, because CO 2 and ?E raw fluxes tend to overestimate and underestimate the values, respectively. Both ?E and NEE followed the daily photosynthetic solar irradiance course, but maximum values were not recorded at the same time. Apparent quantum yield and water use efficiency were higher under partly cloudy skies; both variables can be applied to simulation models in order to improve management practices and increase yield.
机译：对作物和大气之间发生的生物物理过程的理解对于定义适当的管理实践以增加作物产量至关重要。本研究的目的是分析甘蔗作物在发育和中期之间的水蒸气和二氧化碳（CO 2）通量，作为环境变量的函数，并评估对通量的校正作用。 2013年6月7日至11月17日之间，通过涡度协方差技术（EC）对巴西东北部种植的甘蔗作物进行了潜热通量（ΔE）和净生态系统CO 2交换（NEE）微气象测量。通过透明度指数（Kt）根据混浊状况对天数进行了表征。通过EC技术设置的ΔE和NEE由于热量和水蒸气的传递而需要进行校正，因为CO 2和ΔE的原始通量往往会分别高估和低估这些值。 ？E和NEE均遵循日光合作用太阳辐照度过程，但未同时记录最大值。在部分多云的天空下，表观量子产率和水分利用效率较高。这两个变量都可以应用于仿真模型，以改善管理实践并提高产量。

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