摘要
有机碳氮是影响陆地生态系统的重要因子,保持并提高土壤碳氮储量,是稳定生态系统生产力的关键.以南京紫金山土壤为研究对象,依照海拔高度进行采样,对比分析了土壤有机碳氮的变化规律.研究结果表明:紫金山土壤有机碳氮受地表植被的影响比较大,混交林>林地>草地,土壤有机碳氮总量随海拔的升高呈现上升趋势,土壤碳氮比高达34～45,且随海拔升高呈下降趋势.相关分析表明,紫金山土壤有机碳与全氮质量分数呈显著正相关关系,由此说明氮素主要以有机氮的形式存在于有机质中.
As important factors affecting terrestrial ecosystems, organic carbon and nitrogen can maintain and enhance soil carbon and nitrogen reserves, which is the key to ecosystem productivity. Soil samples were taken in different altitudes in Purple Mountain, and organic carbon and total nitrogen content were determined using routine analytical methods. The results show that the soil organic carbon and nitrogen contents vary with covering vegetation, which is largest in mingled forest and smallest in meadow. The soil organic carbon and nitrogen increase with alti- tude,while the ratio of carbon to nitrogen decreases with altitude. Significant linear relationship exists between organic carbon and total nitrogen, which suggests that the nitrogen is mainly existed in soil organic matter in organic form. The study is hoped to provide scientific references for ecological and environmental protection in Purple Mountain.
出处
《南京信息工程大学学报（自然科学版）》
CAS
2012年第4期326-329,共4页
Journal of Nanjing University of Information Science & Technology（Natural Science Edition）
基金
江苏省农业气象重点实验室开放基金(JKLAM201203)
国家自然科学基金(40901146)
关键词
紫金山
不同海拔高度
土壤
有机质
全氮
Purple Mountain
different altitude
soil
organic matter
total nitrogen
