华北落叶松—白桦凋落物混合分解研究  

Mixed litter decomposition of Larix principis-rupprechtii and Betula platyphylla

作　　者：赵喆[1] 刘延文 纪福利 刘晓兰 贾忠奎[1] 马履一[1] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083 [2]塞罕坝机械林场,河北围场068466

出　　处：《中南林业科技大学学报》2016年第12期74-78,84,共6页Journal of Central South University of Forestry & Technology

基　　金：中央高校基本科研业务费专项(TD2011-08);林业公益性行业科研专项(201004021)

摘　　要：采用凋落物袋法对华北落叶松Larix gmelinii和白桦Betula platyphylla叶凋落物以不同比例混合(PB、PL、8L:2B、7L:3B、6L:4B、5L:5B),研究凋落物混合分解的分解速率及养分动态变化。结果表明:不同比例华北落叶松—白桦凋落物混合分解均表现出了前期分解迅速,后期分解缓慢的特点。单独分解时,纯白桦的分解速率要高于纯华北落叶松的分解速率,混合凋落物对凋落物的分解有不同程度的促进作用,6L:4B的凋落物残留量最小,分解最快。在分解前期,混合凋落物对分解速率并没有显著影响,但对分解过程中的养分动态有显著混合效应。混合分解促进了华北落叶松凋落物中N、P的富集,且随着白桦比例的增加凋落物中N、P的富集加剧,混合处理的N、P含量均高于纯华北落叶松处理,在分解后期,部分处理(6L:4B、5L:5B)N、P含量甚至超过纯白桦。混合分解对K的释放无显著影响。混合分解降低了华北落叶松凋落物的C/N和C/P。Research the mixed litter decomposition rate and nutrient dynamic change of Larix principis-rupprechtii and Betula platyphylla leaf litter with different mixing ratio （PB, PL, 8L：2B, 7L：3B, 6L：4B, 5L：5B）. This reserch use the litter bag method. Important findings： （1） Different proportion of Larix principis-rupprechtii and Betula platyphylla mixed litter showed early decompose rapidly, slow decomposition characteristics late. （2） Decomposition rate of pure Betula platyphylla was higher than that of pure Larix principis-rupprechtii when separate decomposition, mixed treatment on litter decomposition have different degrees of promoting function, 6L：4B had the highest decomposition rate. （3） Mixed litter decomposition had significant effect on nutrient dynamic in the process of decomposition. It promoted the enrichment of Larix principis-rupprechtii litter of N element and P element, and N element and P element of the mixed litter enrichment raised with the increase of proportion of Betula platyphylla litter. The N element and P element content of mixed litter were higher than pure Larix principis-rupprechtii, and parts process （6L：4B, 5L：5B） N element and P element content even more than pure Betula platyphylla in the late decomposition. It had no significant effect on the release of K. （4） Mixed litter decomposition reduced C/N and C/P of the larch litter.

关 键 词：华北落叶松 白桦 混合分解 分解速率 养分动态 

分 类 号：S718.55[农业科学—林学] S791.22