不同立地沙柳生长特性的研究

Study on the Characteristics of Salix Growth in Different Sites

[目的]通过研究不同立地类型沙柳生长特性与地上生物量,指出鄂尔多斯鄂托克前旗东南部沙柳最适合的生存立地类型。[方法]对鄂尔多斯市鄂前旗昂素镇不同立地类型沙柳生长特征——枝高、基径、冠幅进行实测,并分析各立地类型沙柳生长特性、灌丛枝生物量、叶生物量和单枝总生物量的差异以及各项指标间的关系。[结果]沙柳枝高、基径、冠幅及平均枝生物量的变化趋势均为固定沙地>半固定沙地背风坡>半固定沙地丘间低地>半固定沙地迎风坡;沙柳单枝平均叶生物量和单枝总生物量排序为固定沙地>半固定沙地丘间地>半固定沙地背风坡>半固定沙地迎风坡;沙柳单枝枝生物量在单枝总生物量中所占比例大小为半固定沙地背风坡>半固定沙地丘间低地>固定沙地>半固定沙地迎风坡,而单枝叶生物量占单枝总生物量的比例大小顺序正好相反;沙柳生长因子间的关系和生长因子与生物量的关系都可用一元线性回归模型Y=a+bX表示。[结论]研究区固定沙地是最理想的沙柳培育立地类型,半固定沙地背风坡和丘间低地也比较适合沙柳生长,而半固定沙地迎风坡不宜推广沙柳。

[Objective] The most suitable site for salix growth in the southeastern part of the Etuokeqian in Ordos county was pointed out based on the research on the growth characteristics and biomass at different types of sites.[Method] The height of tree,the diameter of basic stem and the width of tree crown of salix grown in the different types of sites were measured and the growth characteristics of salix plant,the biomass of salix shrub shoot,the biomass of leaf and the difference in total biomass among single branches and the relationship between the indicators were analyzed.[Result] The order of the variation trend in the height,the diameter of basic stem,the width of tree crown and the average biomass of branch was fixed sandy land leeward slope semi-fixed sandy land lowland among hills in semi-fixed sand land windward slope in semi-fixed sandy land.The order in the average biomass of leaf in single branch and total biomass of single branch was fixed sandy land place among hills in semi-fixed sandy land leeward slope in semi-fixed sandy land windward slope in semi-fixed sandy land.The order in the ratio of total biomass of the stem of single branch to total biomass of single branch was leeward slope in semi-fixed sandy land lowland among hills in semi-fixed sandy land fixed sandy land windward slope in semi-fixed sandy land,but the order was right reversed in the ratio of the biomass of the leaf of single branch to total biomass of single branch.The relationship among growth factors and the relationship between growth factors and biomass were available in the linear regression model： Y=a＋bX said.[Conclusion] The fixed sandy land was the ideal type of site for the salix growth and the leeward and the lowland slope among hills in semi-fixed sandy land were also more suitable for the salix growth and the windward slope in semi-fixed sandy land was not suitable for salix planting.