The responses of early foliar litter humification to reduced snow cover during winter in an alpine forest

Ni, Xiangyin; YangWanqin,; LiHan,; XuLiya,; Hejie,; TanBo,; WuFuzhong,

doi:10.4141/cjss2013-121

Cited by 24 publications

(22 citation statements)

References 39 publications

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“…One important reason for this result was the presence of deep snow cover (approximately 20-30 cm extending from October to April of the following year [30]) in these forests, which allows soil decomposers to maintain considerable activity beneath the insulating snow cover [52,53]. Alternatively, snowmelt may directly contribute to the release of dissolved substances from foliar litter and thus indirectly provide a source of available carbon and nutrients for soil fauna [4].…”

Section: Discussionmentioning

confidence: 99%

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Water, Rather than Temperature, Dominantly Impacts How Soil Fauna Affect Dissolved Carbon and Nitrogen Release from Fresh Litter during Early Litter Decomposition

Liao

Yang

et al. 2016

Forests

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Abstract:Longstanding observations suggest that dissolved materials are lost from fresh litter through leaching, but the role of soil fauna in controlling this process has been poorly documented. In this study, a litterbag experiment employing litterbags with different mesh sizes (3 mm to permit soil fauna access and 0.04 mm to exclude fauna access) was conducted in three habitats (arid valley, ecotone and subalpine forest) with changes in climate and vegetation types to evaluate the effects of soil fauna on the concentrations of dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) during the first year of decomposition. The results showed that the individual density and community abundance of soil fauna greatly varied among these habitats, but Prostigmata, Isotomidae and Oribatida were the dominant soil invertebrates. At the end of the experiment, the mass remaining of foliar litter ranged from 58% for shrub litter to 77% for birch litter, and the DOC and TDN concentrations decreased to 54%-85% and increased to 34%-269%, respectively, when soil fauna were not present. The effects of soil fauna on the concentrations of both DOC and TDN in foliar litter were greater in the subalpine forest (wetter but colder) during the winter and in the arid valley (warmer but drier) during the growing season, and this effect was positively correlated with water content. Moreover, the effects of fauna on DOC and TDN concentrations were greater for high-quality litter and were related to the C/N ratio. These results suggest that water, rather than temperature, dominates how fauna affect the release of dissolved substances from fresh litter.

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Section: Discussionmentioning

confidence: 99%

“…Thus, we collected samples at the end of winter and at the end of the growing season in these regions according to our previous observations [30][31][32][33]. Three litterbags were randomly harvested from each plot on April 22 and October 23, 2014, 162 and 346 days after the initial setup, respectively.…”

Section: Sample Collection and Analysismentioning

confidence: 99%

Water, Rather than Temperature, Dominantly Impacts How Soil Fauna Affect Dissolved Carbon and Nitrogen Release from Fresh Litter during Early Litter Decomposition

Liao

Yang

et al. 2016

Forests

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“…Forest gaps and the associated crown canopies create winter snowpack gradient and freeze-thaw cycles in winter and redistribute precipitation, temperature and solar radiation during the growing season , 2014a, 2014b. Previous studies conducted by our team investigated the litter decomposition dynamics in alpine forests, including the loss of mass, release of nutrients, response of humification and effects on microbial biomass, and we concluded that the deep snow patches caused by forest gaps promoted litter decomposition during winter (Tan et al 2011a, 2011b, Zhu et al 2013, Ni et al 2014, Wu et al 2014b. Based on these results, we measured the litter CTs content and losses during different decomposition periods from the gap center to the closed canopy.…”

Section: Introductionmentioning

confidence: 74%

“…1. The values of the following factors were calculated to clearly describe the temperature characteristics: daily mean temperature (DMT), positive accumulated temperature (PAT, sum of temperatures above 0 °C), negative accumulated temperature (NAT, sum of temperatures below 0 °C - He et al 2015, Ni et al 2014 and the frequency of soil freeze-thaw cycles (FSFC, the total number of times the temperature changed from above/below 0°C to below/above 0 °C in a 3-hour period, Konestabo et al 2007 -Tab. 2).…”

Section: Iforest -Biogeosciences and Forestrymentioning

confidence: 99%

The losses of condensed tannins in six foliar litters vary with gap position and season in an alpine forest

Li¹,

Wu²,

Yang³

et al. 2016

iForest

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“…, Ni et al. ), and considerable humic substances were observed even in fresh litter (Qualls et al. , Adani et al.…”

Section: Introductionmentioning

confidence: 99%

Rapid release of labile components limits the accumulation of humic substances in decomposing litter in an alpine forest

Yang

Liao

et al. 2018

Ecosphere

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Recent evidence suggests that recalcitrant compounds are not selectively preserved in soils and that labile components are the precursors of humic substances, but the relationship between the slow accumulation of humic substances and the rapid release of labile components during litter decomposition is not well understood. In an in situ litterbag experiment, we quantified the litter mass loss, release of acid‐soluble labile components, and accumulation of alkali‐soluble humic substances during four years of decomposition of fir (Abies faxoniana) needle and twig litters in an alpine coniferous forest. We found that fresh litter had high contents of humic substances (121 and 151 mg/g for needle and twig litters, respectively), with needle litter showing increases in humic substances contents at the early decomposition stage and decrease later, whereas twig litter showed the reverse pattern. However, the net accumulation of humic substances in both needle and twig litters decreased during decomposition, and the decrease was related to the rapid release of labile components. We conclude that the rapid release of labile components limits the accumulation of humic substances in plant litter during decomposition in this alpine coniferous forest.

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The responses of early foliar litter humification to reduced snow cover during winter in an alpine forest

Cited by 24 publications

References 39 publications

Water, Rather than Temperature, Dominantly Impacts How Soil Fauna Affect Dissolved Carbon and Nitrogen Release from Fresh Litter during Early Litter Decomposition

Water, Rather than Temperature, Dominantly Impacts How Soil Fauna Affect Dissolved Carbon and Nitrogen Release from Fresh Litter during Early Litter Decomposition

The losses of condensed tannins in six foliar litters vary with gap position and season in an alpine forest

Rapid release of labile components limits the accumulation of humic substances in decomposing litter in an alpine forest

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