Soil carbon and litter development along a reconstructed biodiverse forest chronosequence of South-Western Australia
Soil carbon and litter development along a reconstructed biodiverse forest chronosequence of South-Western Australia
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DOI：
10.1007/s10533-010-9519-1
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发表时间：
2010-09
期刊：
影响因子：
4
通讯作者：
S. George;R. Kelly;P. Greenwood;M. Tibbett
中科院分区：
文献类型：
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作者：
S. George;R. Kelly;P. Greenwood;M. Tibbett
随着景观的恢复，土壤有机质随时间的增加而增加。研究SOM随恢复森林时间序列的发展将有助于澄清量化森林砍伐和随后恢复的碳周转率的一些不确定性。本文研究了一个恢复了16年的jarrah森林的4个深度的矿质土壤中土壤有机质的发育。采用粒度分异SOM分异和δ13C同位素位移分析土壤C随植被发育的时空变化。恢复的森林时间序列揭示了土壤C如何随年龄发展的几个重要见解。恢复后12年内凋落物积累超过原生林水平。表层土壤总碳含量随年龄的增长呈上升趋势，但在较低深度的变化不明显。在表层0 ~ 2 cm深度，随着恢复年龄的增加，所有3个SOM粒度组分的碳积累均有所增加。这些生物多样性森林表现出以顽固的稳定形式积累碳的趋势，但仅在表层0-2 cm的矿质土壤中。随着恢复年龄的增加，较低深度的中度不稳定SOM分数有明显的相反趋势。将土壤δ13C与总C浓度进行对比，揭示了在较老的修复地点，随着土壤深度的变化，重新建立了同位素耗尽的易失碳到富集的难失碳连续体。这表明，从成土角度看，恢复土壤正在向原生土壤碳剖面发展。
Soil organic matter (SOM) increases with time as landscape is restored. Studying SOM development along restored forest chronosequences would be useful in clarifying some of the uncertainties in quantifying C turnover rates with respect to forest clearance and ensuing restoration. The development of soil organic matter in the mineral soils was studied at four depths in a 16-year-old restored jarrah forest chronosequence. The size-separated SOM fractionation along with δ13C isotopic shift was utilised to resolve the soil C temporal and spatial changes with developing vegetation. The restored forest chronosequence revealed several important insights into how soil C is developing with age. Litter accumulation outpaced the native forest levels in 12 years after restoration. The surface soils, in general, showed increase in total C with age, but this trend was not clearly observed at lower depths. C accumulation was observed with increasing restoration age in all three SOM size-fractions in the surface 0–2 cm depth. These biodiverse forests show a trend towards accumulating C in recalcitrant stable forms, but only in the surface 0–2 cm mineral soil. A significant reverse trend was observed for the moderately labile SOM fraction for lower depths with increasing restoration age. Correlating the soil δ13C with total C concentration revealed the re-establishment of the isotopically depleted labile to enriched refractory C continuum with soil depth for the older restored sites. This implied that from a pedogenic perspective, the restored soils are developing towards the original native soil carbon profile.