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一、前言灌木固沙林与沙地水分平衡是治沙工作者极为关注的问题之一。六十年代初期,我国许多沙漠科学工作者或从“地”或从“树”两方面研究水分状况,提出了一系列研究报告,使我们对沙地水分的状态和沙生植物的水分生理的认识不断深入。此后,关于水分平衡的研究,一直持续到现在。这些研究成果几乎全部集中在半荒漠地带的宁夏沙坡头、甘肃民勤、临泽等地,而对毛乌素沙地造林的水分平衡问题,未见报道。我们从1975～1985年就这一问题进行了试验研究。1981年以前,沿袭以往的研究方法,局限于湿沙层水分动态,取得大量观测数据,
I. INTRODUCTION Water balance between shrubs and sandy land is one of the issues of great concern to sand control workers. In the early 1960s, many desert scientists in our country studied the water status either from the “ground” or from the “tree” and put forward a series of research reports that enable us to understand the state of the water in the sand and the hydropathology of sandy plants Deepening. Since then, research on water balance has continued until now. Almost all of these research results are concentrated in Shapotou, Ningxia, Minqin, Linze and other places in the semi-desert area. However, there is no report about the water balance in afforestation in Mu Us desert. We conducted a pilot study on this issue from 1975 to 1985. Before 1981, following the previous research methods, confined to the wet sand water dynamics, to obtain a large number of observations,