落叶松人工林凋落物与土壤肥力变化的研究  

Larch litter and soil fertility.

作　　者：陈立新[1] 陈祥伟[1] 段文标 

机构地区：[1]东北林业大学森林资源与环境学院

出　　处：《应用生态学报》1998年第6期581-586,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金

摘　　要：以东北东部山区帽儿山实验林场落叶松人工林作为研究对象，从林地凋落量、林地凋落物归还量、凋落物层现存量以及土壤理化性质的变化等方面，研究了经抚育间伐后不同年龄阶段同一落叶松林分土壤肥力的变化以及间伐与未间伐林分土壤理化性质的差异．结果表明，落叶松人工林凋落量和以凋落物形式归还于林地的营养元素呈现出随年龄增加而增长的总趋势．经抚育间伐后，由于阔叶树种的引入使凋落物的组成结构发生变化，凋落物层的分解率逐步提高，加速了凋落物中营养物质的释放和归还，减缓了凋落物积累与分解的矛盾，提高了落叶松人工林的土壤肥力．１５年间土壤有机质、全Ｎ和全Ｐ２Ｏ５平均值分别增长了３５２．００％、２２５．５３％和３４．９６％．间伐后的落叶松人工林土壤的理化性质得到不同程度的改善．The larch plantations at Maoershan Mt. Experimental Forest Farm in eastern mountainous region of northeastern China were studied to characterize the dynamics of soil fertility under the same thinning larch stand at different age stages and the difference of soil physical and chemical properties between the thinning and non thinning stands, according to the litter amount, the nutrient return from it, the standing litter, as well as the soil physical and chemical properties. The results show that the litter amount and its nutrient return presented an increasing tendency with increased stand ages. After thinning, the introduction of broad leaf trees into the larch plantation made the litter component structure changed, the litter decomposition rate gradually increased, the nutrient material release and return from litter sped up, the contradiction between litter accumulation and decomposition alleviated and the soil fertility of larch plantation increased. On the average, the contents of organic matter, total N and total P 2O 5 were respectively increased by 352.00%, 225.53% and 34.96% within 15 years. The soil physical and chemical properties of larch plantation after thinning were improved in varying degrees.

关 键 词：落叶松 人工林 凋落物 养分归还量 土壤肥力 

分 类 号：S791.220.2[农业科学—林木遗传育种] S718.516[农业科学—林学]