The Effect of the Screen on the Mass, Momentum, and Energy Exchange Rates of a Uniform Crop Situated in an Extensive Screenhouse
The Effect of the Screen on the Mass, Momentum, and Energy Exchange Rates of a Uniform Crop Situated in an Extensive Screenhouse
复制标题
屏幕对位于大屏幕室中的均匀作物的质量、动量和能量交换率的影响
DOI：
10.1007/s10546-011-9682-5
复制
发表时间：
2012
影响因子：
4.3
通讯作者：
J. Tanny
中科院分区：
文献类型：
--
作者：
M. Siqueira;G. Katul;J. Tanny
大面积屏房种植的农作物面积正在迅速增长，特别是在半干旱和干旱地区。在这种受保护的环境中，作物释放或吸收的水蒸气、二氧化碳和显热可以显着改变直接的微环境，进而影响这些通量。植物与其小气候之间这种放大的相互作用对简单评估提出了挑战，即通过屏幕部分覆盖作物如何改变植物水分吸收和光合作用。通过新提出的高阶闭合模型，探讨了屏幕对平均流场、湍流应力、辐射和能量通量以及屏幕室内标量源、汇、通量和平均标量浓度的影响。作为起点，假设有一个广泛的屏蔽室，从而降低了模型结果对屏蔽室精确几何配置的敏感性。屏幕室的模型结果被呈现并参考其开放场对应物。研究了由于屏幕的存在而导致的辐射调制和湍流传输的变化。一般来说，屏幕的存在会导致屏幕室内的环境变得更温暖、更潮湿，从而促进树冠光合作用和蒸腾作用的减少。然而，筛网的总体效果是提高水的利用效率，从而在相同的初级生产总量中节省水。
The area of crops cultivated in extensive screenhouses is rapidly growing, especially in semi-arid and arid regions. Water vapour, carbon dioxide, and sensible heat released or taken up by crops within such protected environments can substantially alter the immediate micro-environment, which in turn, affects these fluxes. This amplified interaction between plants and their microclimate challenges simple assessments on how partially covering the crop by a screen modifies plant water uptake and photosynthesis. Via a newly proposed higher-order closure model, the effects of a screen on the mean flow field, turbulent stresses, radiative and energy fluxes, as well as scalar sources, sinks, fluxes, and mean scalar concentration within screenhouses are explored. As a starting point, an extensive screenhouse is assumed thereby reducing the sensitivity of the model results to the precise geometric configuration of the screenhouse. The model findings for the screenhouse are presented and referenced against their open field counterpart. The radiation modulation and changes to turbulent transport due to the presence of the screen are investigated. In general, the presence of a screen results in a warmer and more humid environment inside the screenhouse, promoting reductions in both canopy photosynthesis and transpiration. However, the overall effect of the screen is to enhance water-use efficiency thereby resulting in water savings for the same amount of gross primary production.