摘要
采集了武夷山4个不同海拔的植物群落(常绿阔叶林、针叶林、亚高山矮林和高山草甸)的土壤样品,在实验室条件下,将含水量调节为田间持水量60%,置于5℃、15℃、25℃和35℃人工气候箱中培养30d,以测定土壤净氮矿化对温度的敏感性。结果表明:相同海拔植物群落的土壤净氮矿化量和氮矿化速率均随温度的升高显著增加;不同海拔间土壤氮矿化量和氮矿化速率大小均表现为:亚高山矮林>常绿阔叶林>高山草甸>针叶林。土壤氮矿化的Q10在1.03～1.54,并且15℃升高到25℃时的Q10比5℃升高到15℃和25℃升高到35℃时的Q10高,表明土壤氮矿化对温度的敏感性在15℃～25℃较高。
Aimed to examine the sensitivity of soil N mineralization to temperature change, soil samples were collected along an elevation gradient with four plant communities （ evergreen broad-leaf forest, coniferous forest, subalpine dwarf forest, and alpine meadow） in Wuyi Mountains Fu-jian of China. The soils were put in PVC tube, adjusted to 60% of field water-holding capacity, and incubated at 5℃, 15℃, 25℃, and 35℃ for 30 days, with their net N mineralization amount and N mineralization rate determined. For the soils from same altitudes, their net N mineralization amount and N mineralization rate increased significantly with increasing temperature; while for the soils from different altitudes, the two indices were in the order of subalpine dwarf forest 〉 evergreen broadleaf forest 〉 alpine meadow 〉 coniferous forest. The Q10 value of soil N mineralization fluctuated between 1.03 and 1.54. that from 5℃ to 15 ℃ and from 25℃ to 35 %. The Ql0 from 15℃ to 25℃ was higher than indicating that soil N mineralization was more sensitive to the temperature from 15℃ to 25℃.
出处
《生态学杂志》
CAS
CSCD
北大核心
2009年第7期1298-1302,共5页
Chinese Journal of Ecology
基金
国家自然科学基金项目(30370256
30670313)
中国森林生态系统服务功能定位观测与评估技术研究资助项目(200704005/wb-02)
关键词
海拔
温度
净氮矿化量
氮矿化速率
Q_(10)
altitude
temperature
net nitrogen mineralization
nitrogen mineralization rate
Q10
