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首页> 外文会议>American Society of Agricultural and Biological Engineers Annual International Meeting >Morning crop water stress index as a sensitive indicator of waterstatus in apple trees
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Morning crop water stress index as a sensitive indicator of waterstatus in apple trees

机译：早晨作物水分应激指数作为苹果树的Waterstatus敏感指标

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We compared the theoretical crop water stress index (CWSI) averaged over late morning hours (10:00-11:00 AM), (CWSImo) and over solar noon hours, midday (1:00-3:00 PM), (CWSImd). We assessed their sensitivity to changes in soil water content includingsoil water deficit, (SWD, %) and soil matric potential, (SMP, kPa) at different root zone depths, and to stem water potential (Vstem). At the effective root zone depth, the linear relationship between SWD and CWSI averaged over morning hours resulted ina reasonably good correlation (R2 = 0.52, p < 0.001) compared with the traditional CWSI at midday (R2 = 0.45, p < 0.001). Also, SMP and CWSIm were well correlated (R2 = 0.63, P<0.001), while it was slightly less correlated with CWSI mi (R2 = 0.50, P<0.001). There was a weak correlation between soil water content and both CWSI mo and CWSImd at the depths 76 cm and 102 cm of the root zone. There was no statistically significant relationship between y/sum and both CWSI mo and CWSImd. The CWSI mo showed high sensitivity to soil water content that can be then used as a good indicator of water status in the root zone profile of apple trees.
机译：我们将理论作物水分压力指数（CWSI）与晚间晚上（10：00-11：00 AM），（CWSIMO）和太阳日，中午（1：00-3：00 PM）进行平均值（10：00-11：00），（CWSIMD ）。我们评估了对不同根区深度的土壤水分含量（SWD，％）和土壤潜力潜力（SMP，KPA）的变化的敏感性，以及茎水势（波动）。在有效的根区深度，SWD和CWSI之间的线性关系在早晨的时间平均导致与中午的传统CWSI相比，相当良好的相关性（R2 = 0.52，P <0.001）（R2 = 0.45，P <0.001）。此外，SMP和CWSIM良好相关（R2 = 0.63，P <0.001），而其与CWSI MI略差（R2 = 0.50，P <0.001）。土壤含水量与CWSI MO和CWSIMD在深度76厘米和102cm根区域之间存在弱相关性。 Y / SUM和CWSI MO和CWSIMD之间没有统计上显着的关系。 CWSI Mo对土壤含水量的敏感性很高，然后可以用作苹果树的根区剖面中的水位良好指标。

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