Simulating evapotranspiration and photosynthesis of winter wheat over the growing season
Simulating evapotranspiration and photosynthesis of winter wheat over the growing season
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DOI：
10.1016/s0168-1923(01)00266-0
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发表时间：
2001-09
影响因子：
6.2
通讯作者：
X. Mo;Suxia Liu
中科院分区：
文献类型：
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作者：
X. Mo;Suxia Liu
建立了一个土壤-植被-大气过程模型，模拟了水分、能量和CO2通量。该模型包括：（1）一个改进的多层冠层辐射传输子模型;（2）一个新的冠层电导/光合作用子模型，区分阳光照射和阴影叶片;（3）一个双源土壤-冠层能量平衡子模型;（4）一个多层土壤水热传输子模型。利用华北平原中国科学院禹城试验站冬小麦绿色至成熟期（1992年）和越冬至成熟期（1998年）两组数据对模型进行了验证。模拟和测量的能量分配，表面温度，根区土壤水分，冠层光合作用之间取得了令人满意的协议。模型推导出的每日作物蒸腾和土壤蒸发率与通过蒸渗仪和波文比法获得的实地测量结果一致。敏感性结果表明，气孔导度/光合作用的Leuning模型比Jarvis和Ball-Berry模型提供更好的蒸散量估计。由该模型计算的光合速率与传统的“大叶”模型计算的光合速率存在显著差异，该模型没有区分光照和遮荫效应。然而，这两种模式产生相当相似的蒸散率。1998年的模拟结果表明，该模式不需要详细的微气象资料，而仅使用气象站资料作为驱动力，具有较好的普适性。
A soil–vegetation–atmosphere process model is established to simulate water, energy and CO2fluxes. The model includes: (1) an improved multi-layer canopy radiative transfer submodel; (2) a new canopy conductance/photosynthesis submodel that distinguishes sunlit and shaded leaves; (3) a two-source soil–canopy energy balance submodel; (4) a multi-layer soil water and heat transfer submodel. The model is validated using two groups of data collected in a winter wheat field transitioning from recovering green through to maturity (in 1992) and from overwintering to maturity (in 1998) at Yucheng Experimental Station, Chinese Academy of Sciences in North China Plain. Satisfactory agreement is obtained between simulated and measured energy partitioning, surface temperature, root zone soil moisture, and canopy photosynthesis. Model-derived rates of daily crop transpiration and soil evaporation are in agreement with field measurements obtained via lysimeter and the Bowen ratio method. Sensitivity results show that the Leuning model of stomatal conductance/photosynthesis gives better evapotranspiration estimates than the Jarvis and Ball–Berry models. There are significant differences between the photosynthesis rates produced from our model and the corresponding rates calculated by the traditional “big leaf” model, which does not differentiate sunlit and shaded effects. However, both models generate fairly similar evapotranspiration rates. The successful simulation in 1998 was achieved using meteorological station data alone as driving force of the model instead of using micrometeorological data as in 1992 case, suggesting that the new model could have general applicability without the need for detailed micrometeorological data.