干旱区植物水分生态位适宜度的数学模型及其过程数值模拟试验研究

Studies on Numerical Simulation of Moisture Niche-fitness Procedure of Arid Plants

在干旱地区水分是影响植物生长的限制因子。文章分析了沙地植物的水分利用状况 ,通过扩展经典生态位理论的内涵 ,用数学抽象方法定义植物水分生态位适宜度为其水分最适生态位点与现实生态位点的贴近度 ,建立了响应数学模型及数值模拟方法 ,依据试验观测结果进行了植物水分生态位适宜度过程的计算分析 ,所获结果具有较高的精度。

Water is the main restricting factor that influences the growth of plants in ari d area. We focused on moisture utility of plants in sandy region, expended the d efinition of classical niche theory and defined the niche fitness degree of plan t moisture as the closeness between the optimal niche and the real niche by usin g abstract mathematics. Furthermore, we established the mathematical model and t he simulating method corresponding. The relative computation analysis and numeri cal simulation were completed on the basis of field experiment, and the result o f simulation is agreement with the practical observation result. The relative re sults of numerical simulation provide new theoretical model and quantitative bas is for artificial planting in arid regions which without irrigation.