Quantitative characteristics of Salix gordejevii population in different sandy land habitats
不同沙地生境下黄柳(Salix gordejevii)种群若干数量特征的比较研究

Plant morphology,growth and population characteristics of S.gordejevii in different sandy land habitats (semi fixed sand dunes,fixed sand dunes and inter dunes lowland),as well as species composition and their frequency in the herb layer of the scrubs,were compared.Plants in the inter dunes lowland were more branchy with a larger number of first year shoots which were shorter,and grew more slowly;the frequency distribution of the first year shoot lengths tended to have a "thin" peak drifting towards the left;their leaves were shorter and narrower with a high length/width ratio.Plants growing in the semi fixed sand dunes,on the other hand,were less branchy with a larger number of first year shoots which were longer,and grew faster;the frequency distribution of the shoot lengths followed the Normal Distribution Model;their leaves were longer and wider with a low length/width ratio.The measures of the branching system and leaf dimensions of the plants in fixed sand dunes were rather intermediary between those of the above and the frequency distribution of the first year shoot lengths followed the Weibull Distribution Model. The species composition and their frequency in the herb layer of the scrubs also varied with habitats.