用双涌源能量守恒模型计算浑善达克沙地羊草群落蒸腾量的研究

The Calculation of Transpiration of the Community of the Leymus Chinensis in Otingdag Sandy Area by Energy Conservation Mode

文章利用浑善达克沙地南沙梁试验站两年的羊草群落气孔导度及相关的环境因子观测数据,用多元逐步回归法建立了羊草群落单一牧草与环境因子间响应关系模型,并用此模型计算出单一牧草的冠层导度。羊草群落冠层的导度用叶宽、株高加权单一牧草气孔导度获得。利用羊草群落冠层阻力及其他阻力按S-W能量守恒模型计算了两个不同水文年的羊草群落蒸腾量。2004年是丰水年(生育期雨量R=274.6mm;P=5%),计算的羊草群落的蒸腾量为430.1mm,实测土壤蒸发169.0mm;2005年(生育期雨量R=178.8mm;P=50%)计算的羊草群落的蒸腾量为378.4mm,实测土壤蒸发124.2mm。

The research studied the response relationship between the stomatal conductance of single grass among the Leymus chinensis community and environment factors by multi - regression model using two years of experimental data of stomatal conductance and environment factors . The stomatal conductances of the Leymus chinensis community were gained by weighing stomatal conductance of single grass with width of leaf and highth of grass. The transpiration rate of the Leymus chinensis community in the different hydrology years was calculated by S - W energy conservation model using simulated data of stomatal resistances and other resistances. The transpiration of the Leymus chinensis community （rainfall in growth seasons is 274.6 mm with probability of 5% ） is 430.1 mm while soil evaporation observed is 169.0 mm in 2004 and （ rainfall in growth seasons is 178.8 mm with probability of 50% ） is 378.4 mm while soil evaporation observed is 124.2 mm in 2005.