建立了以日长 (L)和日总辐射 (TDR)为自变量的春小麦 (TriticumaestivumL .)碳同化和干物质累积 (DMA)的简化模型 ;考虑了水分限制下光能利用效率 (α)、碳传输导度 (gc)均被降低的设定 ,将反映春小麦水分状况的叶水势 (Ψ)作为参数纳入本模型 ;Ψ则通过多元回归由 80cm土层相对含水量 (θR ,80 )、气温 (Ta)、水汽压差 (VPD)、低于- 1.5MPa叶水势之和 (Ψc ,1.5)给出。讨论了模型在“黑河地区地气相互作用研究”中的应用实例。模型分析和模拟结果表明 ,该简化生长模型能较好地描述春小麦在水分限制和无水分限制条件下的干物质累积过程。
【英文摘要】 The authors constructed a simplified model of spring wheat (Triticum aestivum L.) carbon assimilation and dry matter accumulation (DMA) process which consisted of two independent variables, day length (L) and total daily radiation (TDR). Leaf water potential (Ψ) was incorporated into the simplified growth model based on the assumption that both light use efficiency (α) and CO 2 conductance of assimilation (g c) were depressed by water limitation. Finally,Ψ was estimated from a regression equation i...
【基金】 TheNationalNaturalScienceFoundationofChina!( 94870 0 4) ;; TheChineseAcademyofSciencesandJapaneseMinistryofEducation Science
