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典型喀斯特山区植被类型对土壤有机碳、氮的影响

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
  • 维普
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.
Effect of vegetation types on soil organic carbon and nitrogen in typical karst mountainous area
The variations of soil nutrients under tour vegetation types (grassland, shrubs, secondary 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).Moreover, 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.

vegetation typesoil organic carbontotal nitrogenkarst mountainous area

李菲、李娟、龙健、廖洪凯、刘灵飞、张文娟

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贵州师范大学贵州省山地环境重点实验室,贵阳550001

贵州师范大学地理与环境科学学院,贵阳550001

植被类型 土壤有机碳 土壤全氮 喀斯特山区

国家自然科学基金国家自然科学基金贵州省社发攻关项目贵州省科技厅-贵州师范大学联合基金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

4146107231360121黔科合SY字[2013]3162号黔科合J字LKS[2012]25号研创201320

2015

生态学杂志
中国生态学学会

生态学杂志

CSTPCDCSCD北大核心
影响因子：1.439
ISSN：1000-4890
年,卷(期)：2015.34(12)
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