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• 研究报告 • 上一篇    下一篇

典型喀斯特山区植被类型对土壤有机碳、氮的影响

李菲1,李娟2**,龙健1,2,廖洪凯1,刘灵飞1,张文娟1,2   

  1. (1贵州师范大学贵州省山地环境重点实验室, 贵阳 550001; 2贵州师范大学地理与环境科学学院, 贵阳 550001)
  • 出版日期:2015-12-10 发布日期:2015-12-10

Effect of vegetation types on soil organic carbon and nitrogen in typical karst mountainous area.

LI Fei1, LI Juan2**, LONG Jian1,2, LIAO Hong-kai1, LIU Ling-fei1, ZHANG Wen-juan1,2   

  1. (1Guizhou Key Laboratory of Mountain Environment, Guizhou Normal University, Guiyang 550001, China; 2Department of Geography and Environmental Science, Guizhou Normal University, Guiyang 550001, China)
  • Online:2015-12-10 Published:2015-12-10

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15~30 cm)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7.39 g·kg-1,显著高于次生林(30.33和2.90 g·kg-1)、灌丛地(19.32和2.04 g·kg-1)和荒草坡(17.75和1.83 g·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。

关键词: 民族乡镇, 阿尔拉镇, 城市化, 景观格局, 驱动力

Abstract: 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, Southwest 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 seasonal 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.

Key words: driving force., urbanization, ethnic township, landscape pattern, Aerla Town