南京林业大学学报（自然科学版）2017，Vol.41Issue(5)：27-34,8.DOI:10.3969/j.issn.1000-2006.201609051
甘肃兴隆山不同演替阶段典型森林群落的凋落物动态
Litterfall dynamics of typical forest communities at different succession stages in Xinglong Mountain of Gansu Province, China
摘要
Abstract
[Objective]Provide a scientific basis for research on forest ecosystem carbon storage and nutrient cycling, by analyzing the quantity, seasonal changes and components of litterfall in three typical forests at different successional sta?ges in the Xinglong Mountain of Gansu Province, China. [Method]By using a litter trap, the quantity, components ( needles, broadleaves, branches, flowers, fruits, bark and unclassified litter) of litterfalls and their monthly dynamics were measured in two successional stages of coniferous and broadleaf mixed forest ( Populus davidiana?Betula platyphylla?Picea wilosonii forest) to dark coniferous forest ( Picea wilsonii?shrub forest and Picea wilsonii?Fargesia nitida?moss for?est) from August 2011 to July 2015.[Result]Annual litterfall amount ranged from 553448 kg/hm2 to 795125 kg/hm2 for the three forest communities, with the order ranked as Populus davidiana?B. platyphylla?Picea wilosonii forest>Picea wilsonii?shrub forest>Picea wilsonii?F. nitida?moss forest. The litterfall amount of the coniferous and broadleaf mixed for?est was remarkably higher than that of the dark coniferous forest. The annual litterfall amount decreased gradually along with forest succession. Leaves ( 4491%) , unclassified ( 2053%) , branches ( 1586%) and fruits ( 1474%) were the main components of litter in the Populus davidiana?B. platyphylla?Picea wilosonii forest;leaves ( 4122%) , unclas?sified ( 2358%) , branches ( 1853%) and fruits ( 1332%) were the main components of litter in the Picea wilsonii?shrub forest;and leaves ( 3748%) , unclassified ( 2751%) , and branches ( 2235%) were the main components of litter in the Picea wilsonii?F. nitida?moss forest. In leaf litter, broadleaves were dominant for the coniferous and broadleaf mixed forest, while needles were dominant for the dark coniferous forest. In all three communities, the annual dynamics of litterfall showed double?peaked curve patterns, although the timing of the highest and lowest points were different. For the coniferous and broadleaf mixed forest, the highest and lowest points occurred in October and July, respectively. For the dark coniferous forest, the highest and lowest points occurred in April or May and August or September, respectively. A double?peaked curve also described the monthly dynamics of needle litter, where the high points occurred in April or May and October. A single?peaked curve described the monthly dynamic of broadleaves, unclassified litter, branches, fruits and flowers. The highest peak of broadleaves occurred in October, while those for unclassified liter, branches, and fruits oc?curred in April or May, and that for flowers occurred in May or June. There was no obvious pattern for bark litter.[Conclu?sion]There was an obvious effect of forest succession on the amount and composition of litter. As forest succession pro?gressed from deciduous broadleaf forest to dark coniferous forest, the annual litterfall amount decreased gradually. The per?centage of annual litterfall of broadleaves gradually decreased, while that of needles gradually increased.关键词
凋落物组成/凋落量/凋落节律/森林演替/甘肃兴隆山Key words
component of litterfall/amount of litterfall/litterfall dynamics/forest succession/Xinglong Mountain of Gan⁃su Province分类
农业科技引用本文复制引用
魏强,凌雷,柴春山,陶继新,李国林,张广忠,王多锋,戚建莉,薛睿..甘肃兴隆山不同演替阶段典型森林群落的凋落物动态[J].南京林业大学学报（自然科学版）,2017,41(5):27-34,8.基金项目
国家自然科学基金项目(31160180) （31160180）
国家林业局"948"项目(2013-4-72) （2013-4-72）
