宏观根系吸水补偿模型研究进展  

A review of studies on macroscopic compensated root water uptake model

作　　者：陈立[1,2] 王文科[1,2] 赵明[1,2] 王周锋[1,2] CHEN Li;WANG Wenke;ZHAO Ming;WANG Zhoufeng(School of Environmental Science and Engineering,Chang′an University,Xi′an 710054,China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region,Chang′an University,Xi′an 710054,China)

机构地区：[1]长安大学环境科学与工程学院,西安710054 [2]长安大学旱区地下水文与生态效应教育部重点实验室,西安710054

出　　处：《南水北调与水利科技》2018年第5期122-127,共6页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金(41230314)~~

摘　　要：根系吸水模型是研究植被耗水规律的关键要素,尤其在干旱-半干旱地区,土壤经常出现水分胁迫状态,使得根系吸水过程更为复杂。为准确描述根系的吸水过程,吸水补偿模型在1989年被概念化并成为一个重要的研究方向,国外进行了大量的研究探索,而国内在该领域鲜有研究。虽然根系吸水补偿模型已取得一定的进展,但其模型本身仍然存在一定的物理缺陷,因此,总结并综合分析根系吸水补偿模型发展历程,指出补偿吸水模型忽视了水分胁迫抑制根系吸水的物理机制,以及植物胁迫指数判定是否进行吸水补偿有一定局限性。在此基础上,提出根系吸水补偿模型应考虑潜在蒸腾量和土壤可利用水量供需关系、植物根系生长环境,补偿模型应耦合植物胁迫函数、土壤水分分布及地下水动态特征。The root water uptake model is essential to the study of vegetation evapotranspiration.In arid and semi-arid regions,the soil often has water stress,which makes the root water uptake process even more complicated.In order to describe the root water uptake more accurately,the compensated root water uptake model was conceptualized in 1989 and became an important research direction.There are many explorations abroad,but few in China.Although certain progress has been made on the compensated root water uptake model,it still has some physical defects.This paper summarizes and analyzes the development history of the compensated root water uptake model.It points out that the compensated water uptake model overlooks the physical mechanism of water stress restraining the root water uptake and that using plant stress index to judge whether there is compensated water uptake has certain limitations.Based on comprehensive analysis,this paper proposes that the compensated root water uptake model should consider the growing environment of plant roots and the supply-demand relationship between potential transpiration and available soil moisture.The compensated model should couple the plant stress function,the characteristics of soil moisture distribution,and the dynamic characteristics of groundwater.

关 键 词：根系吸水 宏观模型 补偿机制 

分 类 号：Q945[生物学—植物学]