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对旱区葡萄园采用MAESTRA模型进行参数化并对其气孔导度子模型进行筛选,模拟了冠层辐射传输和碳同化量积累过程。结果表明PARp最大值集中在冠层顶0.4m深度以上及南侧0.1m深度以外,冠层北侧和中心部位的光强迅速减小。以液流测定结果为基准,检验了Jarvis系列气孔导度模型的效果。考虑土壤水分影响和引入参考冠层导度的J-Ref子模型使单株蒸腾量的模拟结果(18.34mol·vine-1·h-1)与测定值(17.74mol·vine-1·h-1)之间没有显著偏差。摸清了西北旱区葡萄园的干物质积累过程。干物质积累量模拟值为1 441.0g,仅比实测值高3.8%。模拟值积累曲线斜率滞后于实测值说明当年初葡萄萌芽消耗的碳水化合物并非来自当年光合产物,而是源于上年储存量,该储存量约占当年干物质总积累量的15%。本研究为西北旱区葡萄园冠层辐射传输和水碳通量研究提供了一套简单易行的模拟方法和参数化方案。
The MAESTRA model was used to parameterize the arid area vineyards and the stomatal conductance sub-model was screened. The process of canopy radiation transfer and carbon assimilation accumulation was simulated. The results showed that the maximum PARp concentration was beyond the depth of 0.4m at the top of the canopy and beyond the depth of 0.1m on the south side, and the light intensity at the north side and the center of the canopy rapidly decreased. The effect of Jarvis series of stomatal conductance models was tested on the basis of flow measurements. The J-Ref sub-model considering the influence of soil moisture and the introduction of canopy conductance made the simulation of transpiration volume (18.34 mol · vine-1 · h-1) and the measured value (17.74 mol · vine-1 · h- 1) there is no significant deviation. Find out the process of dry matter accumulation of vineyards in the arid region of Northwest China. The simulated dry matter accumulation was 1 441.0 g, only 3.8% above the measured value. The slope of the simulated value accumulation curve lags behind the measured values to show that the carbohydrate consumed by the grapes during the early part of the year was not derived from the photosynthetic products of that year but from the previous year’s stored amount accounting for about 15% of the total dry matter accumulated in that year. This study provides a simple and feasible simulation method and parameterization scheme for the study of canopy radiative transfer and water-carbon fluxes in the arid region of Northwest China.