枫香人工林凋落物量及其N,P化学计量季节动态特征

发布时间：2018-01-31 03:24

本文关键词： 枫香凋落物氮磷质量比生态化学计量特征季节动态　出处：《湖南师范大学自然科学学报》2016年02期 　论文类型：期刊论文

【摘要】：为了探索凋落物量及其N,P化学计量随着季节变化所呈现的规律性和相关关系,以湖南枫香(Liquidamba formosana Hance)人工林两年的凋落物为研究对象,开展凋落物量、各组分产量及其N,P质量分数和质量比生态化学计量特征的研究.结果表明:2012和2013年凋落物总量无显著差异性,分别为5 085.9±657.6 kg·hm-2和4 935.7±609.7 kg·hm-2.各组分凋落量从大到小排序为:叶、枝、花果、碎屑.叶的N,P质量分数之间,叶的w(P)与m(N)∶m(P)之间,枝的w(P)与m(N)∶m(P)之间以及碎屑的w(P)与m(N)∶m(P)之间均存在一定的相关性(P0.01).枫香人工林凋落物及各组分产量及N,P质量分数和生态化学计量均存在显著的季节动态,表明季节变化对其均产生了一定的影响.而枫香林凋落物的N,P质量比值逐渐增加,表明P元素对该生态系统起到了限制作用.
[Abstract]:In order to explore the regularity and correlation of litter quantity and its N ~ + P stoichiometry with seasonal variation. The litter amount, yield and N content of two years' litter were studied in the plantation of Liquidamba formosana ance in Hunan Province. The results showed that there was no significant difference in the total litter amount between the two groups in 2013 and 2012. It was 5 085.9 卤657.6 kg 路hm-2 and 4935.7 卤609.7 kg 路hm ~ (-2), respectively. The order of litter was: leaf, branch, flower and fruit. Detritus. Between the mass fraction of Nu P in leaves, the wo P in leaves and the N 1: M P in leaves. There is a certain correlation between the twigs (WP0. 01) and mN0. 01), and between the clastic wP0. 01) and the mN0. 0% mP0. 01 (mP0. 01). The litter and yield and N. There were significant seasonal dynamics of P mass fraction and ecological stoichiometry, which indicated that seasonal variation had a certain influence on them, while the ratio of N / P mass of litter in Maple forest increased gradually. The results indicated that P had a limiting effect on the ecosystem.
【作者单位】：中南林业科技大学生命科学与技术学院;南方林业生态应用技术国家工程实验室;
【基金】：国家林业局“948”先进技术引进项目(2014-4-62) 2013湖南省自然科学基金创新研究团体项目(湘基金委字[2013]7号)
【分类号】：S714
【正文快照】： 凋落物层是森林生态系统能量转换和物质循环的重要场所,凋落物分解后形成森林表层土壤的腐殖质和有机质[1].因此,森林凋落物在维持土壤肥力、维持森林生态系统稳定性以及确保森林生态系统物质循环和能量循环正常运转方面具有重要的作用[2-3].凋落物的N,P质量比制约着凋落物的

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