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| 长白山区水曲柳根呼吸的季节动态及影响因子 | |
| 引用本文： | 任军,徐程扬,魏彦波,林玉梅,段永宏.长白山区水曲柳根呼吸的季节动态及影响因子[J].林业科学,2010,46(5). |
| 作者姓名： | 任军 徐程扬 魏彦波 林玉梅 段永宏 |
| 作者单位： | 1. 北京林业大学,北京100083;吉林省林业科学研究院,长春130033 2. 北京林业大学,北京,100083 3. 吉林省林业厅,长春,130031 4. 吉林省林业科学研究院,长春,130033 |
| 基金项目： | 国家自然科学基金项目(30571483);;教育部博士点基金项目(20050022007) |
| 摘 要： | 为了探讨林木呼吸的季节动态及影响因素,采用LI-COR-6400-06测定并研究长白山红松针阔混交林中天然水曲柳根系呼吸的季节变化规律,分析根系呼吸与土壤温度、土壤湿度和土壤全氮含量等因子的关系。结果表明:天然水曲柳不同径级根系呼吸速率在生长季节均有明显的季节动态,其中7月最高,10月最低,呈单峰曲线,呼吸速率在1.02～9.27μmol·g-1s-1之间;水曲柳根系呼吸速率与10cm深处土壤温度季节变化一致,二者呈显著指数相关(P<0.05);根系呼吸与土壤湿度呈二次曲线相关,即当土壤湿度在一定范围内时根系呼吸速率与其成正比,而当土壤湿度超过一定值时根系呼吸速率则与土壤湿度成反比;根系呼吸速率与土壤N含量呈线性相关,并且随树木年龄的增加呼吸速率下降;不同径级根系呼吸温度系数Q10值在2.21～2.71之间变化,且Q10值随根系径级增大而降低,表明细根对土壤温度的敏感性高于粗根。 |
| 关 键 词： | 长白山 水曲柳 根呼吸 季节动态 |
Seasonal Dynamics and Influence Factor of Root Respiration of Fraxinus mandushurica in the Changbai Mountain |
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| Ren Jun,Xu Chengyang,Wei Yanbo,Lin Yumei,Duan Yonghong.Seasonal Dynamics and Influence Factor of Root Respiration of Fraxinus mandushurica in the Changbai Mountain[J].Scientia Silvae Sinicae,2010,46(5). | |
| Authors: | Ren Jun Xu Chengyang Wei Yanbo Lin Yumei Duan Yonghong |
| Institution: | 1. Beijing Forestry University Beijing 100083/a>;2. Jilin Provincial Academy of Forestry Sciences Changchun 130033/a>;3. Forestry Department of Jilin Province Changchun 130031 |
| Abstract: | To research seasonal variation and influence factor of tree root respiration,the seasonal dynamics of root respiration of Fraxinus mandushurica were measured at a mixed forest of broad-leaved and Korean pine in the Changbai Mountain of Jilin,China. CO2 effluxes rate was monitored using an infrared gas exchange analyzer ( LI-COR-6400-06) from May to October 2007,and the influence factors,such as soil temperature,soil moisture and soil N contents were also measured in the forest. The results showed that the s... |
| Keywords: | Changbai Mountain Fraxinus mandushurica root respiration seasonal dynamics |
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