摘要
在当前气候变化的背景下,沿海拔梯度,选择长白山4处泥炭地为研究地,以喙叶泥炭藓和大泥炭藓为分解材料,于丘上和丘间两种生境进行分解实验,研究物种、生境以及海拔下降导致的增温对泥炭藓残体分解速率的影响。结果表明,增温以及生境和物种差异均影响泥炭藓残体的分解,即增温促进泥炭藓分解,丘间生境更利于泥炭藓残体分解,喙叶泥炭藓分解率高于大泥炭藓。比较而言,物种即分解材料的内在质地是影响植物残体分解的主要因素,即高氮含量和低C/N比的喙叶泥炭藓更易分解。增温与物种及增温与生境间均存在交互作用,可以改变生境和物种差异对泥炭藓残体分解的影响,可能会对泥炭地碳汇功能产生深远影响。
Sphagnum is the dominant and mainly peat-forming plant component in northern peatlands. The substan- tial function of carbon sequestration for peatlands is due to the slow decomposition of Sphagnum. Until now, we still know very little about the main factors that affect Sphagnum decomposition in Northern China under the current cli- mate change background. Along an altitudinal gradient, we selected Sphagnumfallax and S. palustre litter as ma- terials in two habitats hummocks and hollows of four peatlands, Jinchuan, Hani, Yuanchi and Chichi in the Chang- bai Mountains, to study the effects of warming namely altitudinal decrease, habitat and species on decomposition rate of Sphagnum litter. The results show that, slight warming promoted Sphagnum litter decomposition; the decom- position rate of S. fallax was higher than S. palustre; hollow habitats were beneficial to Sphagnum decomposition. Overall species namely intrinsic quality of litter was the main factor to affect Sphagnum decomposition. S. fallax with high nitrogen content and low C/N was more easily to decompose. Interaction between warming and species and between warming and habitat can change species and habitats effects on decomposition, and it may create a far- reaching impact on carbon sink function of peatlands.
出处
《山地学报》
CSCD
北大核心
2013年第4期442-447,共6页
Mountain Research
基金
国家自然科学基金项目(40971036
40830535)
环保公益性行业科研专项资金项目(201109067)资助~~
关键词
泥炭藓
长白山
海拔
变暖
分解
Sphagnum
Changbai Mountains
elevation
warming
decomposition
