运用响应函数、相关函数、单年分析等树木年轮气候学的方法，研究了锡林河流域草原沙地上白扦年轮生长指数的变异。结果表明：白扦的生长对环境的变化相当敏感，当年9月至上年8月的月平均温度和月降雨量解释年轮宽度方差量的约70%；白扦当年的生长量与上年9月、当年2月、5月的降雨量之间具明显的正相关性，而与当年5月的大气温度具显著负相关关系。由于沙地具有渗透性较强和防止土壤深层水分蒸发的特点，特别是上年8～10月的降雨可部分保存于沙地内，便于植物下年利用。由此认为，在沿锡林河流域中部的沙带上，建立以现有白扦为分布中心的人工白扦林将是完全可行的。%The variation in ring growth indices of Picea meyeri was assessedby dendrochronological techniques including response functions, correlation functions and single-year analysis on sandy dunes in the Xilin River basin steppe. The results show that growth of Picea meyeri was sensitive to climate change. Furthermore, it was determined that mean monthly temperature and total monthly precipitation from September of the current year to August of the preceding year can account for about 70% of the variance in the tree-ring width. The rainfalls in February and May of the current year together with that of the previous September were significantly correlated with the current year's growth pattern. Additionally,radial growth was negatively correlated with mean monthly temperature in current May. In this region the sandy substrate is characterized by high water infiltration and low soil moisture evaporation rates. As a result, relatively high precipitation from prior August to prior October can be reserved in the sandy soil and the Picea meyeri trees show strong adaptation to the sandy substrate in these semi-arid grasslands. Therefore, the establishment of Picea meyeri forest plantations in the sandy belt along the middle reaches of Xilin River are deemed feasible.
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