气候变化领域集成服务门户(CCPortal): Tissue type and location within forest together regulate decay trajectories of Abies faxoniana logs at early and mid-decay stage

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DOI	10.1016/j.foreco.2020.118411
	Tissue type and location within forest together regulate decay trajectories of Abies faxoniana logs at early and mid-decay stage
	Chang C.; Wang Z.; Tan B.; Li J.; Cao R.; Wang Q.; Yang W.; Weedon J.T.; Cornelissen J.H.C.
发表日期	2020
ISSN	0378-1127
卷号	475
英文摘要	Deadwood decomposition plays a crucial role in global carbon and nutrient cycles. Factors controlling deadwood decomposition at local scales could also have strong effects at broader scales. We tested how trait variation within stems (i.e. tissue types) and forest habitat heterogeneity (i.e. location within forest) together influence the deadwood decay trajectory and decay rate. We conducted an in situ decomposition experiment of Abies faxoniana logs in an alpine forest on the eastern Qinghai-Tibetan Plateau, decomposing logs from a series of decay classes I-III (on a 5-class scale) for five years on the forest floor in canopy gap, gap edge and under closed canopy (each sized 25 ± 3 × 25 ± 3 m). We found strong differences in density and chemical composition between tissue types at least across decay classes I-III, which revealed the distinct contribution of each tissue type to carbon and nutrient cycling. There were remarkable interactions of tissue types and locations within forest. We found bark always decomposed faster than wood, while heartwood can decompose faster than sapwood in canopy edge and canopy gap. Locations within forest influenced the best fit decay model and decay rate of bark and sapwood in the same way, while it had no corresponding effects for heartwood decay dynamics. The largest difference in T0.25 and T0.4 (time to 25% and 40% mass loss) between locations were 1.52 and 3.21 (bark), 19.41 and 37.61 (wood overall), 31.82 and 60.15 (sapwood), and 12.86 and 22.84 (heartwood), respectively. We also found that pH was significantly negatively related with sapwood and heartwood mass loss, demonstrating that pH can potentially be applied to evaluate sapwood and heartwood mass loss when density correction is difficult to achieve at least at early to mid-decay stages. However, whether pH is a powerful predictor of decomposition trajectory across more species and biomes remains to be tested. We strongly recommend that further model predictions of coarse log decay include radial positions within stem and locations within forest as factors to increase the reliability of carbon budget estimates. © 2020 Elsevier B.V.
关键词	Budget control Carbon Forestry Location Nutrients Tissue Trajectories Wood products Chemical compositions Closed canopies Density correction Forest habitats Model prediction Nutrient cycling Qinghai-Tibetan plateau Radial position Decay (organic)Abies faxoniana
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132601
推荐引用方式 GB/T 7714	Chang C.,Wang Z.,Tan B.,et al. Tissue type and location within forest together regulate decay trajectories of Abies faxoniana logs at early and mid-decay stage[J]. Forest Ecology and Management,2020,475.
APA	Chang C..,Wang Z..,Tan B..,Li J..,Cao R..,...&Cornelissen J.H.C..(2020).Tissue type and location within forest together regulate decay trajectories of Abies faxoniana logs at early and mid-decay stage.,475.
MLA	Chang C.,et al."Tissue type and location within forest together regulate decay trajectories of Abies faxoniana logs at early and mid-decay stage".475(2020).