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EFFECT OF LITTER QUALITY AND DECOMPOSITION ON N MINERALIZATION IN SOIL OF CASTANOPSIS PLATYACANTHA- SCHIMA SINENSIS FOREST
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF APPLIED & ENVIRONMENTAL BIOLOGY
- Issue:
- 2
- DOI:
- 10.3321/j.issn:1006-687X.2005.02.005
- Key Word:
- 中亚热带;凋落物质量;土壤氮矿化;氨化作用;硝化作用
Abstract： 用控温、控水室内培养方法,研究了中亚热带栲木荷常绿阔叶林和邻近柳杉人工针叶林凋落物的分解及其对栲木荷林土壤氮矿化的影响.结果表明:栲木荷阔叶林的凋落物失重率大于针阔混合凋落物的失重率,大于柳杉针叶纯林凋落物的失重率.所有凋落物失重率都与其初始氮含量呈显著负相关,和初始碳含量呈显著正相关,而与凋落物C/N比的相关性不强.不同凋落物处理下的土壤NO3--N含量差异显著(P＜0.05,N=18),NH4+-N含量差异不显著(P＞0.05,N=18),混合凋落物处理下的土壤NO3--N和NH4+-N含量最高,分别是224.21 mg kg-1和56.77 mg kg-1,其氮转化速率也最高,硝化、氨化、氮矿化速率分别为1.74 mg kg-1 d-1、0.36 mg kg-1 d-1和1.90mg kg-1 d-1.各凋落物处理下的土壤氮含量随时间变化的规律不一致.土壤氨化速率与土壤全氮呈显著正相关(r=0.843,P＜0.05,N=21),与栲木荷林凋落物的失重率呈显著负相关(r=-0.997,P＜0.05,N=21).图3表4参29
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