丹参叶面积指数与干物质积累模拟模型

引用“辐热积”概念，建立叶面积指数模型和基于光合的干物质积累模型。将叶面积指数模型和高斯积分法相结合，依据丹参的冠层结构特点，建立三层模型。选用光合直角双曲线模型，并考虑温度对最大光合速率的影响，量化丹参的呼吸消耗；去除生长后期气温下降、光照减弱等因素造成丹参地上部分枯萎、干物质减少，使后期模拟更为精确，从而建立基于生理生态过程的丹参光合生产和干物质转化积累动态模拟模型。用均根方差、相对误差及拟合指数对独立的试验2数据进行检验，叶面积指数和干物质模型模拟值和实测值间决定系数R≥0.992，模拟值和实测值间符合度达到极显著水平，回归相对误差均在10%左右，拟合指数均接近于1。

Simulation of Leaf Area Index and Dry Matter Accumulation in Salvia miltiorrhiza Bge.

For the whole growth analog system and long-range control in Salvia miltiorrhiza Bge, models for Leaf Area Index (LAI) and photosynthesis-driven dry matter were developed. Thermal effectiveness and photosynthetically active radiation (TEP) was quoted to develop the mechanistic LAI model. According to the canopy structure of S.miltiorrhiza, a 3-layer model was established in combination of LAI model and Gaussian integration. Considering the effect of temperature on maximum photosynthesis rate, perpendicular hyperbola model was chosen to quantify photosynthesis. The model calculated maintenance respiration and growth respiration which consumed part of the photosynthate. The shoot would lose some dry matter due to inward and outward factors during the late growing period, including the declined temperature and decreased irradiance. Partition index of shoot was quantified by TEP to calculate shoot dry matter from plant biomass. The senescence and dried-up of shoot was deducted to simulate the dynamic biomass accumulation process precisely. Model accuracy was validated to the independent experiment 2 by three different statistical indices: Root mean squared error (RMSE), Relative error (RE) and the index of agreement (d). There was a significant agreement between predicted and observed values. All their coefficients of determination were higher than 0.992.RE was about 10%, and d approached to 1.