武夷山不同海拔高度土壤氮矿化对温度变化的响应

生态学杂志

武夷山不同海拔高度土壤氮矿化对温度变化的响应

徐宪根¹;周焱¹;阮宏华¹;韩勇¹;於华¹;曹慧敏¹;汪家社²;徐自坤²

¹南京林业大学森林资源与环境学院江苏省林业生态工程重点实验室，南京 210037; ²福建武夷山国家级自然保护区管理局，福建武夷山 354300

收稿日期:2008-12-02 修回日期:1900-01-01 出版日期:2009-07-10 发布日期:2009-07-10

Responses of soil nitrogen mineralization to temperature change along an elevation gradient in Wuyi Mountains, China.

XU Xian-gen¹;ZHOU Yan¹;RUAN Hong-hua¹;HAN Yong¹;YU Hua¹;CAO Hui-min¹;WANG Jia-she²;XU Zi-kun²

¹Key Laboratory of Forestry Ecological Engineering of Jiangsu Province, College of Forest Resources and Environmental Science, Nanjing Forestry University, Nanjing 210037, China;²Administrative Bureau of Wuyi Mountain National Nature Reserve, Wuyishan 354300, Fujian, China

Received:2008-12-02 Revised:1900-01-01 Online:2009-07-10 Published:2009-07-10

摘要/Abstract

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30 d，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。

关键词: 间作, 混作, 油菜, 紫云英, 经济效益, 土地利用效益

Abstract: 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 broadleaf forest, coniferous forest, subalpine dwarf forest, and alpine meadow) in Wuyi Mountains Fujian 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 Q10 value of soil N mineralization fluctuated between 103 and 154. The Q10 from 15 ℃ to 25 ℃ was higher than that from 5 ℃ to 15 ℃ and from 25 ℃ to 35 ℃, indicating that soil N mineralization was more sensitive to the temperature from 15 ℃ to 25 ℃.

Key words: Inter cropping, Mixed cropping, Rape, Milk vetch, Economic benefit, Land use benefit

徐宪根;周焱;阮宏华;韩勇;於华;曹慧敏;汪家社;徐自坤. 武夷山不同海拔高度土壤氮矿化对温度变化的响应[J]. 生态学杂志.

XU Xian-gen¹;ZHOU Yan¹;RUAN Hong-hua¹;HAN Yong¹;YU Hua¹;CAO Hui-min¹;WANG Jia-she²;XU Zi-kun². Responses of soil nitrogen mineralization to temperature change along an elevation gradient in Wuyi Mountains, China.[J]. cje.

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