李文凤 张静 达娃旺杰



摘要:为了解森林土壤养分的空间特性,以西藏色季拉山为主要研究对象,根据野外调查采样和室内样品测定分析为基础,结合GIS空间插值方法分析森林土壤养分空间分布状况。结果表明,色季拉山属酸性土壤,其土壤有机质和全氮含量高于全国平均值,土壤有机质和速效磷随海拔增加而升高,速效钾与之相反,全氮含量在山体中部较高;山体东、西坡土壤养分指标差异显著,随海拔上升均有一定的变异规律。
关键词:色季拉山;不同坡向;土壤养分;空间分布
中图分类号:S714.8 文献标识码:A 文章编号:0439-8114(2015)14-3361-03
DOI:10.14088/j.cnki.issn0439-8114.2015.14.008
Study on Spatial Distribution of Soil Nutrients in Sejila Mountain
LI Wen-feng, ZHANG Jing, DAWA Wang-jie
(Department of Resources and Environment, Agricultural and Animal Husbandry College of Tibet University, Linzhi 860000, Tibet, China)
Abstract: In order to analyze the spatial characteristics of forest soil nutrients in Sejila mountain, based on field investigation and laboratory sample measurement,spatial distribution of forest soil nutrients was analyzed with GIS spatial interpolation methods.The results showed that, the soil of Sejila mountain was acidic,the organic matter and total nitrogen content of soil were higher than the national average,soil organic matter and available phosphorus content rised with increasing altitude,available potassium decreases with increasing altitude,total nitrogen content was higher in the middle of the mountain.The soil nutrient indicators in east and west slope were significantly different,and there were some variation regularities as altitude rised.
Key words: Sejila mountain; different slope; soil nutrients;spatial distribution
土壤是重要的生态因子,也是植物养分元素的主要来源,并直接关系到作物的生长状况。土壤养分更是为植物提供生长发育所必须的营养元素,也是评价土壤肥力的主要内容[1,2]。土壤有机质及矿物质是土壤养分的重要来源,其中土壤有机质更是衡量土壤养分的重要指标之一,在全国第二次土壤普查中,将土壤养分划分为6个等级,分别根据土壤养分的指标内容进行等级划分[3],其中有机质含量大于4%为一级,有机质含量小于0.6%为六级(极低)。因此,了解并分析土壤养分的空间分布特征,对于研究植被分布生长、植物群落组成和生态环境保护发展等都有着极其重要的作用。
森林土壤养分的空间分布特征和其地形、地质因子有直接的联系,对于林地的产量分析、环境保护和土地质量评价等都十分重要[4-6],更体现了不同林地生态恢复状况和植被类型的影响。……