【摘要】 在干旱半干旱气候条件下,土壤水分状况通常是决定植物气孔导度的重要因素,现有气孔导度模型Jarvis-类和耦合模型(或光合-导度模型)未充分考虑这一因素对气孔导度的影响。本文以Jarvis气孔导度模型为基础,提出一个充分考虑土壤水分状况因素的气孔导度模型。该模型对羊草连续两年(1998~1999)野外实地观测结果拟合良好(R2=0.603),预测能力较线性回归方程(R2=0.361)有明显提高。更多还原

【Abstract】 In arid and semi-arid area,soil moisture is a vital factor affecting plant stomatal conductance,but was ignored to some extent by most stomatal conductance models which were generally classified into two types,i.e.,Jarvis-type and photosynthesis-conductance type.This paper presented a new model,which adopted the main structure of Jarvis-type and fully considered the importance of soil moisture condition.The stomatal conductance of Leymus chinensis,a dominant species of the typical steppe in Inner-Mongolian grassland,was predicted by the model during two growth seasons(1998～1999),with a precision of R~2=0.603,obviously higher than R~2=0.361 obtained by regression equations.更多还原