FOREST LITTER DECOMPOSITION IN RELATION TO SOIL-NITROGEN DYNAMICS AND LITTER QUALITY
FOREST LITTER DECOMPOSITION IN RELATION TO SOIL-NITROGEN DYNAMICS AND LITTER QUALITY
复制标题
DOI：
10.2307/1941327
复制
发表时间：
1985-01-01
期刊：
影响因子：
4.8
通讯作者：
MELILLO, JM
中科院分区：
文献类型：
--
作者：
MCCLAUGHERTY, CA;PASTOR, J;MELILLO, JM
对美国威斯康星州 5 个邻近森林中 6 种森林凋落物的分解和氮及有机化学含量的分解和变化进行了为期两年的研究。这 5 个森林的植物区系不同，分别以糖枫 (Acer saccharum)、白橡 (Quercus alba)、大齿白杨 (Populus grandidentata)、白松 (Pinus strobus) 和铁杉 (Tsuga canadensis) 为主。 5 个林分的氮矿化率范围为 29-125 kg.ha-1.yr-1。在所有 5 个林分中，移植的糖枫叶和红枫 (A. rubrum) 木材的分解率与氮矿化率均不相关，表明氮矿化率不影响初始分解率。然而，矿化率与本地主要落叶层的分解率相关。氮首先在所有窝中积累，但到 2 年孵化期结束时，所有叶面窝中都开始释放氮。氮浓度随着累积质量损失近似线性增加，但最终在一些落叶层中下降。最大氮累积量和每克凋落物质量损失累积量均与土壤氮矿化率无关。凋落物的化学成分影响分解速度和模式。可溶性物质和相对富含可溶物的残渣在分解的早期阶段迅速消失。最终，慢慢消失的酸溶性和酸不溶性物质主导了所有窝的质量损失模式。
Decomposition and changes in N and organic-chemical content of 6 types of forest litter were studied for 2 yr in 5 adjacent Wisconsin [USA] forests. The 5 forests were floristically dissimilar, being dominated, respectively, by sugar maple(Acer saccharum), white oak (Quercus alba), bigtooth aspen (Populus grandidentata), white pine (Pinus strobus), and hemlock (Tsuga canadensis). N mineralization rates in the 5 stands ranged 29-125 kg.ha-1.yr-1. Decomposition rates of transplanted sugar maple leaves and red maple (A. rubrum) wood were not correlated with N mineralization rates in all 5 stands, indicating that N mineralization rates do not affect initial decomposition rates. However, mineralization rates were correlated with decomposition rates of the native dominant foliage litter. N first accumulated in all litters, but by the end of the 2-yr incubation period N release had begun in all foliage litters. N concentrations increased approximately linearly with cumulative mass loss but eventually declined in some foliage litters. Neither maximum amount of N accumulated nor amount accumulated per gram of litter mass loss was related to the rate of soil N mineralization. Chemical composition of litter affected decomposition rates and patterns. Soluble substances and litters relatively rich in solubles disappeared rapidly during early stages of decomposition. Eventually, slowly disappearing acid-soluble and acid-insoluble substances dominated the pattern of mass loss in all litters.