%0 Journal Article
%T Water uptake model analysis of crop roots under non-uniform water potential<br>非均匀水势下作物根系吸水模型分析
%A CHEN Shao-Qing
%A ZHU Da-Yi
%A OU Zhong-Hui
%A <br>陈少清
%A 朱大艺
%A 欧忠辉
%J 植物生态学报
%D 2012
%I Editorial Office of Chinese Journal of Plant Ecology
%X Aims Our objective is to consider a water uptake model of crop roots under non-uniform water potential. This is based on principles of water conservation in soil-plant system and water potential s driving force on water transport. Methods We introduced two expressions of non-uniform soil water potential, linear and exponential functions, and compared the analytical solutions under non-uniform and uniform water potentials. This model is used to analyze the effect of ratio of radial resistance and axial resistance on plant water uptake and to determine the optimal root length within a reasonable range of this ratio. Important findings In certain circumstances, the water uptake model for plant roots with non-uniform water potential can be simplified to a uniform water potential model, and the optimal root length is close to the actual value after the Poseuille formula is changed to fit plant vessels.
%K axial resistance
%K crop root water uptake model
%K non-uniform and uniform soil water potential
%K radial resistance<br>木质部传导阻力
%K 作物根系吸水模型
%K 土壤非均匀水势与均匀水势
%K 根系吸收阻力
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=2F2173CCFF292BF447DC2681EA33BBAE&aid=42D88A52831D719FB97F1AAD0B446500&yid=99E9153A83D4CB11&vid=933658645952ED9F&iid=DF92D298D3FF1E6E&sid=04FC77FB58A9B53A&eid=8DDBA6455F2E3ECF&journal_id=1005-264X&journal_name=植物生态学报&referenced_num=0&reference_num=0