摘要
选取典型喀斯特山区荒草地、灌丛地、次生林地和原生林地作为研究对象，分别在4个季节对选定区域分层（0—15和15～30em）进行土壤采集，探讨不同植被类型下土壤养分的动态变化。结果表明：不同植被类型下，土壤有机碳和全氮含量差异较大，其中原生林2项指标全年平均分别为72．61和7．39g·kg^-1，显著高于次生林（30．33和2．90g·kg^-1）、灌丛地（19．32和2．04g·kg^-1）和荒草坡（17．75和1．83g·kg^-1）。在土壤各理化指标中，土壤有机碳、氮储量与其他指标均有良好相关性，影响研究区土壤理化指标的主要因素是植被因素（74．31％），次要因素是季节因素（14．85％）。不同植被类型土壤有机碳、全氮含量及其储量在各个季节变化趋势大致相同，表现为春秋两季较高，夏冬两季较低。
The variations of soil nutrients under four vegetation types （grassland, shrubs, se- condary forest and natural forest） in karst mountainous area of central Guizhou Province, South- west China were investigated. Soil samples （0-15 and 15-30 cm layers） were collected from the four vegetation types in different seasons （January, April, July and October）. The results showed that the SOC and TN concentrations changed obviously under different vegetation types. The sea- sonal average concentrations of SOC and TN were 72.61 and 7.39 g ·kg^-1 in the natural forest, respectively, being significantly higher than those in the secondary forest （30.33 and 2.90 g ·kg^-1） , shrubs （ 19.32 and 2.04 g ·kg^-1） and grassland （ 17.75 and 1.83 g ·kg^-1 ）. More- over, SOC and TN stocks were significantly correlated with SOC and TN concentrations, C/N, and bulk density. Soil nutrient indexes were dominantly affected by vegetation type （74.31% ） , followed by season （14.85%）. Changes of SOC and TN concentrations and stocks had the same trend in each season under different vegetations, being higher in spring and autumn, and lower in summer and winter.
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第12期3374-3381,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(41461072
31360121)
贵州省社发攻关项目(黔科合SY字[2013]3162号)
贵州省科技厅-贵州师范大学联合基金项目(黔科合J字LKS[2012]25号)
贵州师范大学博士研究项目
贵州师范大学研究生创新基金项目(研创2013(20))资助
关键词
植被类型
土壤有机碳
土壤全氮
喀斯特山区
vegetation type
soil organic carbon
total nitrogen
karst mountainous area
