【摘要】 水分在沙地生态系统中起着重要作用,是土壤、植物和大气中物质与能量循环不可缺少的介质,因此研究沙地土壤水分变化规律及其影响因子对揭示沙地生态系统的稳定性及阐明沙地水文变化过程具有重要的意义。从沙地土壤水分时间和空间变化、水分入渗特征以及水量平衡研究方面阐述了沙地土壤水分研究现状和动态特征,分析了土壤水分的时空变化特征及其影响因子,揭示了不同层次土壤水分时空变化规律、不同降雨条件下土壤水分变化特征以及不同人工植被区在不同降雨条件下土壤水分入渗量的响应,总结了沙地土壤水分模型的研究进展,探讨了沙地土壤水分模型的研究与环境因素的关系。通过对沙地土壤水分研究进展的综述,展望了今后应加强如下研究:(1)对沙区不同造林模式混交林开展植物功能型与土壤水量关系研究,找出人工植被在不同时期对土壤水分利用的阈值;(2)建立从点到面尺度转化的模型关系,更好地定量大尺度下区域水分承载力;(3)对土壤—植被—大气系统水量平衡和水分传输过程及转化规律等进行系统研究并建立耦合模型;(4)探索在有限的水资源环境下通过提高沙地土壤肥力,进而提高植被生产力。更多还原

【Abstract】 Water plays an important role in the ecosystem of sandy land, and it is an indispensable medium for the circulation of matter and energy in soil, plants and atmosphere. Therefore, the study on the change law of soil water in sandy land and its influencing factors is of great significance to reveal the stability of the ecosystem of sandy land and to clarify the process of hydrological change in sandy land. From sandy soil moisture changes in time and space, water infiltration characteristics and water balance research expounded the sandy soil water dynamic characteristics, research status and analyzed the spatial and temporal variations of soil moisture and its impact factors, revealed the different levels of soil moisture change rules of time and space, changes of soil moisture in different rainfall conditions and different artificial vegetation zone in the response of the amount of soil water infiltration under different rainfall conditions, summarized the research progress of sand soil moisture model, discussed the research of sand soil moisture model′s relationship with environmental factors. Based on the review of the research progress on soil moisture in sandy land, the following researches should be strengthened in the future.(1) To study the relationship between plant function type and soil water amount in mixed forests with different afforestation modes in sandy land, and to find out the threshold value of artificial vegetation on soil water use in different periods.(2) To establish the model relation of transformation from point to plane scale to better quantify regional water bearing capacity under large scale.(3) To Systematically study the water balance, water transfer process and transformation law of the soil-vegetation-atmosphere system and establish the coupling model;(4) To explore how to improve the productivity of vegetation by improving the soil fertility of sandy land in the limited water resources environment.更多还原