地理研究 ›› 2007, Vol. 26 ›› Issue (3): 491-499.doi: 10.11821/yj2007030009

• 城市与乡村 • 上一篇    下一篇

福建万木林自然保护区米槠和杉木细根分解动态

金 钊1,3, 杨玉盛2, 董云社1,2, 齐玉春1, 陈光水2   

  1. 1. 中国科学院地理科学与资源研究所,北京 100101;
    2. 福建师范大学地理科学学院,福州 350012;
    3. 中国科学院研究生院,北京 100039
  • 收稿日期:2006-08-06 修回日期:2007-01-16 出版日期:2007-05-25 发布日期:2007-05-25
  • 作者简介:金钊(1979-),男,湖北咸宁人,博士研究生。研究方向为环境生物地球化学与全球变化。 通讯作者 : 杨玉盛,教授,博士生导师。E-mail:geoyys@fjnu.edu.cn
  • 基金资助:

    国家自然科学基金资助项目(40501072,30170770);高等学校优秀青年教师教学科研奖励计划资助项目;中国科学院知识创新重大项目(KZCXI-SW-01-04);国家重点基础研究发展规划项目(2002CB412503);中国科学院地理科学与资源研究所知识创新项目(CXIOG-E01-03-03)

Studies on decomposition of fine roots of Castanopsis carlesii and Cunninghamia lanceolatain Wanmulin Natural Reserve, Fujian province (1.Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101,China|2.College of Geography Science, Fujian Normal University, Fuzhou 350012, China|3.Graduate School of the Chinese Academy of Sciences, Beijing 100039, China )

JIN Zhao1,3, YANG Yu-sheng2, DONG Yun-she1,2, QI1, CHEN2   

  1. 1. ;
    2. ;
    3.
  • Received:2006-08-06 Revised:2007-01-16 Online:2007-05-25 Published:2007-05-25
  • Supported by:

    国家自然科学基金资助项目(40501072,30170770);高等学校优秀青年教师教学科研奖励计划资助项目;中国科学院知识创新重大项目(KZCXI-SW-01-04);国家重点基础研究发展规划项目(2002CB412503);中国科学院地理科学与资源研究所知识创新项目(CXIOG-E01-03-03)

摘要: 应用网袋法和砂滤管法对福建省万木林自然保护区米槠、杉木细根及两树种细根混合样品分解进行了为期两年的研究。结果表明:(1)两种方法研究细根分解,米槠细根在自身群落中分解最快,月分解速率分别为0.0052(0~1 mm)和0.0080(1~2 mm)。此外,米槠细根及其混合样品在米槠林中分解,1~2 mm径级分解快于0~1 mm径级;而杉木细根及其混合样品在杉木林中分解,规律相反。林地土壤环境条件、各径级细根自身的质量特性是影响细根分解的主要因子。(2)两种方法所得结果均能应用Olso负指数方程进行较好的拟合,拟合的各项指标相近。在亚热带森林生态系统中,运用砂滤管法研究细根分解具有可行性。此外,砂滤管法研究细根分解过程中养分的释放规律,具有一定的应用前景。

关键词: 细根, 分解, 网袋法, 砂滤管法, 米槠, 杉木, 万木林自然保护区, 福建省

Abstract: Decomposition of fine roots plays an important role in carbon turnover and nutrients cycling in forest ecosystems. To date, several methods have been suggested to study the decomposing process of fine roots: (1) litterbag; (2) intact soil core; (3) minirhizotrons and so on. The method of litterbag is commonly used worldwide for researching on the process of decomposition of fine roots, and its primary disadvantage is strongly disturbing in situ conditions which may result in an underestimation of decomposition rate of fine roots. Intact soil core is another technique for researching on the fine roots decomposition. The major disadvantages of this method are laborious in sampling and different greatly among samples. Minirhizotrons is an advanced technique for studying the decomposition of fine roots, but may overestimate the decomposition rate. Therefore, the greatest challenge in study of fine-root decomposition is to design efficient experiments and develop new techniques. In this study, we applied the method of carborundum tube widely used in agriculture ecosystem into forest ecosystem to study the decomposing process of fine roots of C.carlesii, C.lanceolata(chinese fir) and their mixed samples, and compared it with the method of litterbag. The experimental site is located at Wanmulin Natural Reserve(27°03'N, 118°09'E)in Fujian province. This experiment was conducted from May 2002 to May 2004. Through two years’ experiment, the results show that: (1) fine roots of C.carlesii decomposed fastest in its community with the two decomposition methods, and its monthly decomposition rates are 0.0052(0~1 mm)and 0.0080(1~2 mm). In addition, fine roots of C.carlesii and its mixed samples decomposed in C.carlesii community show that the decomposition of 1~2 mm diameter is faster than 0~1 mm diameter; fine roots of chinese fir and its mixed samples decomposed in chinese fir plantation laws contrary. Soil condition and biochemical quality of fine roots are the main factors affecting fine roots decomposition. (2) The results of the two methods can be better fitted by Olso negative exponential equation and the fitted decomposition indicators shows small difference between the two methods. In subtropical forest ecosystems, carborundum tube method can be applied to study fine-root decomposition.

Key words: C.carlesii, C.lanceolata, fine roots, decomposition, litterbag method, carborundum tube method, Wanmulin Natural Reserve, Fujian province