福建万木林自然保护区米槠和杉木细根分解动态

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中文摘要：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.

外文标题：Studies on decomposition of fine roots of Castanopsis carlesii and Cunninghamia lanceolata(chinese fir)in Wanmulin Natural Reserve,Fujian province

外文摘要：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) minirhi-zotrons 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 a-mong 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.

外文关键词：

C. carlesiiC. lanceolatafine rootsdecompositionlitterbag methodcarborundum tube methodWanmulin Natural ReserveFujian province

作者：

金钊、杨玉盛、董云社、齐玉春、陈光水

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作者单位：

中国科学院地理科学与资源研究所,北京,100101

中国科学院研究生院,北京,100039

福建师范大学地理科学学院,福州,3550012

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

基金：

国家自然科学基金国家自然科学基金教育部高等学校优秀青年教师教学科研奖励计划中国科学院基金国家重点基础研究发展计划(973计划)中国科学院知识创新工程项目

项目编号：

4050107230170770KZCXI-SW-01-042002CB412503CXIOGE01-03-03

出版年：

2007

地理研究

中国科学院地理科学与资源研究所

地理研究

CSTPCDCSCDCHSSCD北大核心

影响因子：2.214

ISSN：1000-0585

年,卷(期)：2007.26(3)

被引量9
参考文献量15