根系吸水的最小能量模型的实验验证与评价

三峡水库是我国特大型水利枢纽工程.三峡工程建成后,随水库运行将在厍区两岸形成垂直落差30 m的消落带,面积达300 km2.结合三峡库区消落带的气候、坡度、水深、地貌等区域基本特征,以遥感数据为基础,以GIS技术为手段,对三峡库区消落带土地资源进行分析研究,划分出消落带土地资源的6种类型,即硬岩型消落带、软岩型消落带、松软堆积型消落带、库尾松软堆积型消落带、湖盆松软堆积型消落带、岛屿松软堆积型消落带,并给出了不同类型消落带的可持续土地资源利用模式.

Experimental Validation and Evaluation of Minimum Energy Model on Root Water Exaction

The quantitative modeling of root water exaction is difficult in research on soilroot hydraulic dynamics. Present models were constructed under certain ideal conditions and based on poor understandings of the mechanisms of root water exaction and thus their applications were rather limited. The minimum energy model was presented based on the physical concept that plant would consume minimum energy for root water exaction in order to survive. But it is not clear if this theory could truly reflect root water exaction. In this research,a soil column experiment was conducted to validate the model. Results indicate that the model had a higher modeling precision under normal water condition, while the modeling precision decreased under drought condition. The reason may be related with the biological mechanism inside plant themselves.