Forest gaps slow the sequestration of soil organic matter: a humification experiment with six foliar litters in an alpine forest.
Forest gaps slow the sequestration of soil organic matter: a humification experiment with six foliar litters in an alpine forest.
复制标题
林隙减缓了土壤有机质的固存：在高山森林中对六片落叶层进行腐殖化实验
DOI：
10.1038/srep19744
复制
发表时间：
2016-01-21
影响因子：
4.6
通讯作者：
Wu F
中科院分区：
文献类型：
--
作者：
Ni X;Yang W;Tan B;Li H;He J;Xu L;Wu F
含有碳和其他养分的植物凋落物的腐殖化作用极大地促进了土壤有机质的积累，但这一过程可能会被冬季和生长季节森林间隙引起的环境变化所改变。2012年11月至2014年10月，在青藏高原东部高山森林进行了野外凋落物袋试验。6种优势类型的落叶被放置在不同的林窗位置，包括林窗中心，冠层的差距，扩大的差距和关闭的冠层的森林地面。经过两年的培养，所有的落叶基本上腐殖化，特别是在第一个冬天，虽然新积累的腐殖物质是年轻的，可以进一步分解。林隙对凋落物腐殖化的影响显著，但受取样季节和凋落物类型的调节。与郁闭林冠下的凋落物相比，经过2年的田间培养，差距中心的腐殖化作用受到抑制。这里提出的结果表明，林隙的形成延迟了土壤有机质的积累，减少了土壤固碳在这些高山森林。
Humification of plant litter containing carbon and other nutrients greatly contributes to the buildup of soil organic matter, but this process can be altered by forest gap-induced environmental variations during the winter and growing seasons. We conducted a field litterbag experiment in an alpine forest on the eastern Tibetan Plateau from November 2012 to October 2014. Six dominant types of foliar litter were placed on the forest floor in various forest gap positions, including gap centre, canopy gap, expanded gap and closed canopy. Over two years of incubation, all foliar litters were substantially humified especially during the first winter, although the newly accumulated humic substances were young and could be decomposed further. The forest gaps exhibited significant effects on early litter humification, but the effects were regulated by sampling seasons and litter types. Compared with the litter under the closed canopy, humification was suppressed in the gap centre after two years of field incubation. The results presented here suggest that gap formation delays the accumulation of soil organic matter and reduces soil carbon sequestration in these alpine forests.