Idri Hastuty Siregar, Marta Camps-Arbestain, Gabor Kereszturi, Alan Palmer, Miko U. F. Kirschbaum, Tao Wang
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引用次数: 0
摘要
全球变暖对土壤有机碳(C)的影响可以通过比较不同温度的地点来研究。然而,温度与其他环境属性的协变可能会影响观测结果。在此,我们研究了塔拉纳基火山(新西兰)上火山物质形成的森林土壤的热梯度,以厘清温度和活性矿物对土壤有机碳数量和组成的影响。我们采集了四个深度和四个海拔高度的土壤,年平均温度在 7.3 ℃ 至 10.5 ℃ 之间。不同地点的土壤有机碳储量差异不大(85 厘米深度的平均值为 162 MgC ha-1, P > .05)。铝(Al)络合碳和矿物螯合碳均未随温度发生显著变化(P > .05)。土壤有机质的分子特征显示,植物源碳随温度升高而减少,而微生物加工的碳则有所增加。伴随着这些变化,土壤短程阶(SRO)成分(包括异芬烷)普遍随温度升高而增加。结构方程建模的结果表明,虽然根据分子指纹推断,温度升高往往会加速土壤有机碳的分解,但它也会对土壤总碳产生积极影响,这可能是通过增加植物碳的输入来实现的。尽管矿物质相关碳与土壤有机碳之间存在密切联系,但随着温度升高,30-85 厘米深度的活性矿物质丰度增加,并没有增加该深度的土壤有机碳浓度。因此,我们认为,在湿润-温带气候条件下,新鲜 C 输入而非活性矿物介导了火山岩土壤热梯度下土壤 C 对温度的响应。
Disentangling the effects of temperature and reactive minerals on soil carbon stocks across a thermal gradient in a temperate native forest ecosystem
Effects of global warming on soil organic carbon (C) can be investigated by comparing sites experiencing different temperatures. However, observations can be affected by covariance of temperature with other environmental properties. Here, we studied a thermal gradient in forest soils derived from volcanic materials on Mount Taranaki (New Zealand) to disentangle the effects of temperature and reactive minerals on soil organic C quantity and composition. We collected soils at four depths and four elevations with mean annual temperatures ranging from 7.3 to 10.5 °C. Soil C stocks were not significantly different across sites (average 162 MgC ha−1 to 85 cm depth, P > .05). Neither aluminium (Al)-complexed C, nor mineral-associated C changed significantly (P > .05) with temperature. The molecular characterisation of soil organic matter showed that plant-derived C declined with increasing temperature, while microbial-processed C increased. Accompanying these changes, soil short-range order (SRO) constituents (including allophane) generally increased with temperature. Results from structural equation modelling revealed that, although a warmer temperature tended to accelerate soil organic C decomposition as inferred from molecular fingerprints, it also exerted a positive effect on soil total C presumably by enhancing plant C input. Despite a close linkage between mineral-associated C and soil organic C, the increased abundance of reactive minerals at 30–85 cm depth with temperature did not increase soil organic C concentration at that depth. We therefore propose that fresh C inputs, rather than reactive minerals, mediate soil C responses to temperature across the thermal gradient of volcanic soils under humid-temperate climatic conditions.
期刊介绍:
Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.