采用网袋法对台湾桤木与黑麦草复合模式下的细根和草根分解及养分释放进行了为期1年的研究。结果表明：直径0~1 mm、1~2 mm、0~2 mm台湾桤木细根、黑麦草草根、混合根(台湾桤木0~2 mm细根与草根质量比1∶1混合)的干质量残留率分别为39.47%、32.23%、37.11%、16.93%、24.05%，应用Olson指数方程模拟细根和草根的分解过程，拟合程度较好(p<0.01)。分解初期细根N、P、Ca的浓度存在上升趋势，K浓度则明显下降，Mg浓度变化平稳，草根和混合根N、K浓度变化趋势与细根的相同，其余的养分浓度与细根的浓度表现出不同规律。细根和草根分解过程中K、Mg、P的残留率与其干质量残留率变化相似，而N、Ca的残留率下降则较平缓；元素释放速率以K最快，其次为Mg、P、N，Ca最慢。混合处理的分解速率和N、P、K、Ca释放率介于单独分解的0~2 mm细根和草根相应释放率之间，而Mg释放率则大于单独分解的0~2 mm细根和草根的释放率。
Abstract
This study aims to investigate the rate of decomposition and nutrient dynamics of fine root and grass root in a complex ecosystem of Alnus formosanaLolium multiflorum with one year buried bag experiment. The yearly dry weight remaining rate were 39.47%, 32.23%, 37.11%, 16.93% and 24.05% for fine root 0—1 mm, 1—2 mm, 0—2 mm, grass root and mixed root respectively. The process of the decomposition of fine root and grass root was simulated by Olson exponential equation, which showed good degree of fitting (p<0.01). At the initial phase of fine root decomposition, N and P and Ca concentrations increased, while K concentration declined adversely, and the Mg concentration had fluctuated slightly. The concentration of N and K for grass root and mixed root had the same trend as fine root during the decomposition process. However, the other nutrient concentrations demonstrated different trend. The residual rate of K, Mg and P demonstrated the same trend as dry weight remaining rate during the decomposition process of fine root and grass root. On the contrary, the residual rate of N and Ca decreased slowly. The releasing rate of K was the most quickly among all the elements, and the next were Mg, P, N and Ca lied in the last. The decomposition rate of mixed process and the releasing rate of N, P, K and Ca approximately lied between the fine root (0—2 mm) which decomposed by itself and grass root. On the contrary, the releasing rate of Mg was larger than the fine root (0—2 mm) which decomposed by itself and grass root.
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基金
收稿日期：2008-07-24修回日期：2009-03-10基金项目：国家自然科学基金资助项目(30771717)；国家“十一五”科技支撑计划(2006BAC01A11)；教育部重点学科博士点基金(20050626001)；四川省教育厅重点实验室资助项目(2006ZD006)作者简介：王敬(1983—)，硕士。*李贤伟(通讯作者)，教授，研究方向为恢复生态、细根生态及森林经营与管理。 Email: lxw@sicau.edu.cn。引文格式：王敬,李贤伟,张健,等. 台湾桤木与黑麦草复合模式细根和草根的
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