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Multiple abiotic and biotic drivers of long-term wood decomposition within and among species in the semi-arid inland dunes: A dual role for stem diameter
Erdenebileg, Enkhmaa1; Wang, Congwen1; Ye, Xuehua; Cui, Qingguo; Du, Juan; Huang, Zhenying; Liu, Guofang; Cornelissen, Johannes H. C.
AbstractLitter decomposition in sunny, semi-arid and arid ecosystems is controlled by both biotic factors including litter traits and abiotic factors including UV light, but for wood decomposition it still remains uncertain which of these environmental factors are the predominant controls among different woody species. In these dry ecosystems, it is likely that the stem diameter and spatial position of the dead wood are of particular importance especially where wood can be buried versus exposed due to substrate displacement by wind. Here we focus on the fact that stem diameter can affect decomposition rates both via the relative surface exposure to sunlight or soil and via higher resource quality of narrower stems to decomposers. In a field manipulation experiment, we investigated the relative importance of litter position (sand burial vs. surface vs. suspended above the surface), UV radiation (block versus pass) and stem diameter class (<2, 2-4, 4-8, 8-13 and 13-20 mm) on the mass loss of woody litters of four shrub species in an inland dune ecosystem in northern China. We found that after 34 months of in situ incubation, the mass loss of buried woody litters was three times faster than those of suspended and surface woody litters (53.5 +/- 2.7%, 17.0 +/- 1.0% and 14.4 +/- 1.2%, respectively). In surface and suspended positions, litter decomposition rates were almost equally low and most mass loss was during the first 2 years, when bark was still attached and UV radiation had no significant effect on woody litter mass loss. These findings suggest that sand burial is the main environmental driver of wood decomposition via its control on microbial activity. Moreover, wood N and diameter class were the predominant factors driving woody litter decomposition. A key finding was that wider stems had slower litter decomposition rates not only directly (presumably via greater relative surface exposure) but also indirectly via their higher wood dry matter content or lower wood N; these effects were modulated by litter position. Our findings highlight a dual role of stem diameter on wood decomposition, that is, via relative surface exposure and via wood traits. The accuracy and confidence of global carbon cycling models would be improved by incorporating the different effects of stem diameter on woody litter decomposition and below-ground wood decomposition processes in drylands. A free Plain Language Summary can be found within the Supporting Information of this article.
Keyworddryland functional traits litter position sand burial shrub encroachment stem diameter wood litter decomposition
Subject AreaEcology
Indexed BySCI
WOS Research AreaEnvironmental Sciences & Ecology
WOS IDWOS:000529744400001
Publication PlaceHOBOKEN
Funding OrganizationNational Key Research and Development Program of China [2016YFC0500501, 2018YFE0182800] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31470712] ; CAS President's International Fellowship Initiative [2018VCA0014]
Corresponding Author Emailzhenying@ibcas.ac.cn ; liugf@ibcas.ac.cn
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Cornelissen, Johannes H. C.] Vrije Univ Amsterdam, Dept Ecol Sci, Syst Ecol, Amsterdam, Netherlands
Recommended Citation
GB/T 7714
Erdenebileg, Enkhmaa,Wang, Congwen,Ye, Xuehua,et al. Multiple abiotic and biotic drivers of long-term wood decomposition within and among species in the semi-arid inland dunes: A dual role for stem diameter[J]. FUNCTIONAL ECOLOGY,2020,34(7):1472-1484.
APA Erdenebileg, Enkhmaa.,Wang, Congwen.,Ye, Xuehua.,Cui, Qingguo.,Du, Juan.,...&Cornelissen, Johannes H. C..(2020).Multiple abiotic and biotic drivers of long-term wood decomposition within and among species in the semi-arid inland dunes: A dual role for stem diameter.FUNCTIONAL ECOLOGY,34(7),1472-1484.
MLA Erdenebileg, Enkhmaa,et al."Multiple abiotic and biotic drivers of long-term wood decomposition within and among species in the semi-arid inland dunes: A dual role for stem diameter".FUNCTIONAL ECOLOGY 34.7(2020):1472-1484.
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