| 4种退耕模式细根(草根)分解及N动态 |
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| 引用本文： | 荣丽,李贤伟,张健,范川. 4种退耕模式细根(草根)分解及N动态[J]. 林业科学, 2009, 45(8) |
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| 作者姓名： | 荣丽 李贤伟 张健 范川 |
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| 作者单位： | 四川农业大学生态林业工程省级重点实验室,雅安,625014;四川农业大学生态林业工程省级重点实验室,雅安,625014;四川农业大学生态林业工程省级重点实验室,雅安,625014;四川农业大学生态林业工程省级重点实验室,雅安,625014 |
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| 基金项目： | 国家自然科学基金项目,国家十一五科技支撑项目,国家教育部重点学科博士点基金,四川省教育厅重点实验室项目,四川农业大学长江上游植被恢复与重建创新项目共同资助 |
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| 摘 要： | 采用原状土芯法对光皮桦与扁穗牛鞭草复合模式(HN)、光皮桦人工林(H)、扁穗牛鞭草(NC)、柳杉人工林(LS)4种退耕模式细根(草根)分解、影响分解的质量指标及N动态进行研究.结果表明:各模式细根(草根)分解速率符合Olson单指数分解模型,年分解常数(k)分别为1.06,0.93,1.32,0.86,分解1年后干质量损失率分别为65.49%,60.55%,73.32%,57.51%.在1年研究期内,各模式细根(草根)分解过程中的C/N与细根分解速率呈极显著负相关(P≤0.01),与N含量无关,其中光皮桦细根分解速率还与C含量有关.分解90天后,各模式细根(草根)木质素含量与分解速率关系分别为,H,LS呈显著负相关(P≤0.05),HN呈较弱负相关(P=0.087),NC不相关(P=0.279).分解1年后N初始含量最高的HN具有最高的N释放率,N初始含量最低的LS具最低的N释放速率,4种模式N释放速率大小顺序为HN(70.12%)＞H(56.49%)＞NC(46.67%)＞LS(21.76%),N初始含量高是导致此现象的原因.
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| 关 键 词： | 退耕模式 细根 草根 分解 N动态 |
Fine Root and Grass Root Decomposition and N Dynamics in Four Land Use Types of Converting Farmland to Forest |
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| Rong Li,Li Xianwei,Zhang Jian,Fan Chuan. Fine Root and Grass Root Decomposition and N Dynamics in Four Land Use Types of Converting Farmland to Forest[J]. Scientia Silvae Sinicae, 2009, 45(8) |
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| Authors: | Rong Li Li Xianwei Zhang Jian Fan Chuan |
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| Affiliation: | State Key Laboratory of Ecological Forestry Engineering;Sichuan Agricultural University Ya'an 625014 |
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| Abstract: | Decomposition and its influencing factor as well as N dynamics of fine woody root (<2 mm diameter) and grass root in four vegetation forms of birch (Betula luminifera)-grass (Hemarthria compressa) compound(HN),birch (Betula luminifera) plantation (H),grass (Hemarthria compressa) (NC),cedar (Cryptomeria fortunei) plantation(LS) which were all founded in the process of converting farmland to forest or grass. This study was conducted in Hongya,China with the intact-core technique. The decomposition rate patter... |
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| Keywords: | models of converting farmland to forest fine root grass root decomposition N dynamics |
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