摘要
为了解土壤理化性质对中国沙棘生长及生产力的影响,对毛乌素沙地丘间地和迎风坡中国沙棘人工林进行研究。差异性检验结果表明,丘间地的土壤含水率、有机质、全N、速效N及全P含量均极显著或显著高于迎风坡;丘间地的树高、地径、冠幅以及地上生物量、林分生产力均极显著高于迎风坡。相关分析表明,树高、地上生物量与土壤含水率、速效N、全P含量呈极显著或显著正相关关系;树高与有机质含量呈显著正相关关系。土壤含水率与有机质、速效N、全P含量呈极显著正相关关系;有机质与速效N呈极显著正相关关系,速效N与全P呈显著正相关关系。逐步回归分析表明,土壤含水率在生长量及地上生物量积累中起重要作用,是决定林地质量和生产力的主导因子。通径分析表明,土壤含水率对树高、地上生物量的直接作用最大,起的间接作用较大。
In order to know the influence of soil physico-chemical properties on the growth and productivity of the plantations of Hippophae rhamniodes ssp.sinensis,the plantations located in interdunes and in the windward slope in Mu Us sandland were selected to carry out the study.Difference significance test showed that the soil moisture,organic matter,total nitrogen,available nitrogen,total phosphorus in interdunes were very significantly or significantly higher than those in windward slope.The height,base diameter,crown width,aboveground biomass and stand productivity in interdunes were very significantly higher than those in windward slope.Pearson correction analysis demonstrated that the height and aboveground biomass had a very significantly or significantly positive correction with soil moisture,available nitrogen and total phosphorus.The height had a significantly positive correction with soil organic matter.Soil moisture had a very significantly positive correction with soil organic matter,available nitrogen and total phosphorus.Soil organic matter had a very significantly positive correction with available nitrogen,and available nitrogen had a significantly positive correction with total phosphorus.Stepwise regression analysis indicated that soil moisture played an important role in the accumulation of growth increment and aboveground biomass.Soil moisture was a dominant factor which determine stand quality and produc-tivity.Path analysis suggested that soil moisture had the greatest direct effect on height and aboveground biomass,and had a greater indirect effect.
出处
《西北林学院学报》
CSCD
北大核心
2015年第2期22-26,共5页
Journal of Northwest Forestry University
基金
国家自然科学基金(31070551)
云南省省级重点建设学科"森林培育学基金"(XKZ200906)
关键词
中国沙棘
毛乌素沙地
丘间地
迎风坡
土壤理化性质
生长
Hippophae rhamnoides ssp.sinensis
Mu Us sandland
interdune
windward slope
soil physicochemical property
growth
