中文摘要：

为了明确开放式空气CO2浓度增高（FACE）对水稻叶面积动态的影响，借助我国的稻/麦FACE技术平台，以武香粳14为供试品种，设置不同施N量处理，对FACE条件下水稻LAI动态进行研究，并构建了相应的模拟模型。模型以时间为驱动因子，以水稻叶片干物重（LDMW）及比叶重（SLW）为研究对象，确立了LAI随LDMW及SLW的动态变化过程。模拟结果表明，大气CO2浓度增加后水稻叶片干物重随之增加，而比叶重保持不变，因此LAI相应增加，施N量越大这种趋势越明显。通过不同年份试验数据对模型的验证，表明模型拟合程度高，具有较好的适应性和预测性。

英文摘要：

In order to predict the changes of LAI in rice under FACE condition, a FACE experiment was conducted at Anzhen（31°37′N, 120°28′E）, Wuxi, Jiangsu province, using the japonica cuhivar Wuxiangjing 14 in 2001 -2003. Seeds were sowed on 18 May and seedlings were hand transplanted with 3 plants each hill on 13 June. Hills and rows were 16.7 and 30 cm apart, respectively （equivalent to 24 hill·m^-2）. The target CO2 concentration of the FACE plots was 200 μmol·mol^-1 above that in the ambient air, and three levels of N were supplied： LN（150 kg·hm^-2）, MN（250 kg·hm^-2） and HN（350 kg·hm^-2）. The simulation models of LAI in FACE rice were developed, in which the change of leaf dry matter weight （LDMW） and special leaf weight（SLW） were described with time after transplanting, and the dynamic process of LAI in FACE rice was established with LDMW and SLW. The results of simulation indicated that the leaf dry matter weight in rice increased remarkably with free air CO2 enrichment but SLW showed no change, so LAI increased accordingly and affected by the nitrogen application amount. Through testing with different year experimental data, the maximum and minimum RMSE were forecasted as 0.56 and 0.39 in 2001 and as 0.65 and 0.38 in 2002, respectively, suggesting that the models had high fitting degree and preferable applicability and predictability.