Pedogenesis, permafrost, substrate and topography: Plot and landscape scale interrelations of weathering processes on the central-eastern Tibetan Plateau
Pedogenesis, permafrost, substrate and topography: Plot and landscape scale interrelations of weathering processes on the central-eastern Tibetan Plateau
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成土作用、多年冻土、基质和地形：青藏高原中东部风化过程的地块和景观尺度相互关系
DOI：
10.1016/j.geoderma.2014.02.019
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发表时间：
2014-08
期刊：
影响因子：
6.1
通讯作者：
Kuehn, Peter
中科院分区：
文献类型：
--
作者：
Doerfer, Corina;He, Jin-Sheng;Scholten, Thomas;Kuehn, Peter
风化指数（WI）和成土氧化物比（POR）被用来描述沿着气候梯度的风化强度和成土作用的模式，主要是受亚洲和印度季风的不同影响。这些气候环境诱导特定的土壤水分（SM）条件，反过来密切相关的冻土状态，基板和地形。在青藏高原中东部的一条东、西样带沿着，选取了9个样点，共30个土壤剖面。此外，四个土壤组之间的差异进行了分析。据我们所知，本研究是第一次尝试的综合应用不同的WI和POR目前多年冻土影响的土壤基质。它提供了一个评价的各种工具，在化学上描述和区分相关的过程，以不同的环境设置在低风化地区。我们发现，风化趋势沿着气候梯度可以清楚地概述了WI，而POR，而占小规模的变化，描述了显着差异的成土作用之间的连续和不连续的冻土条件。焦磷酸盐可溶性铁（Fep）与土壤有机碳含量具有较强的相关性（r = 0.89），可用于区分冻土和地下水影响的土壤。化学蚀变指数（CIA）是最合适的WI，而无钙CPA更容易偏向于在负水平衡的网站表土的盐分变化，从而假装较低的风化强度。用主要自变量对WI和POR进行回归分析，突出了其具体特点：气候参数最能解释WI，而SM对POR起主导作用。比率（Fed-Feo）/Fet被证明是最合适的POR，通过多元线性回归模型解释了64%的变异，这意味着SM和pH值越高，铁释放量越低。土壤酸度对Fep的解释率为63%，其次是SM。重要的是，所提出的研究提供了工具，调查过去和未来的稳定性或各自的退化过程的冻土生态系统在青藏高原，并可能适用于其他冻土影响的环境。
Weathering indices (WI) and pedogenic oxides ratios (POR) were used to describe patterns of weathering intensities and pedogenesis along climatic gradients, mainly affected by varying influences of the Asian and Indian Monsoon. These climate settings induce particular soil moisture (SM) conditions, in turn closely related to permafrost state, substrate, and topography. Nine sites including a total of 30 soil profiles were examined along an eastern and a western transect across the central-eastern Qinghai–Tibet Plateau. Additionally, differences between four soil groups were analysed. According to our knowledge, the presented study is the first attempt of a comprehensive application of different WI and POR to substrates of currently permafrost-affected soils. It provides an evaluation of various tools in terms of chemically describing and differentiating the related processes to distinct environmental settings in low-weathering regions. We found that weathering trends along the climatic gradients could be clearly outlined by WI, whereas POR rather account for small scale variations, describing significant differences of pedogenesis between continuous and discontinuous permafrost conditions. Pyrophosphate soluble iron (Fep) proved to be useful for differentiating permafrost and ground water influenced soils, showing a strong correlation to total organic carbon (r = 0.89). The chemical index of alteration (CIA) is the most suitable WI, whereas Ca-free CPA is more easily biased by salinity variations of topsoils at sites with negative water balance, thus pretending lower weathering intensities. Regression analyses for WI and POR with main independent variables underline the specific characteristics: climatic parameters best explain WI, while SM is dominant for POR. The ratio (Fed-Feo)/Fet proved as the most appropriate POR with 64% explained variation by a multiple linear regression model, implying significantly lower iron release with higher SM and pH values. Variation of Fep can be explained by 63% with soil acidity being most important, followed by SM. Importantly, the presented research provides tools for investigating past and future stability or respective degradation processes of permafrost ecosystems on the Tibetan Plateau and may be applicable to other permafrost-affected environments.
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影响因子：
6.1
作者：
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通讯作者：
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影响因子：
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作者：
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X. Xue;Jian Guo;Bangshuai Han;Qingwei Sun;Li-chao Liu
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2.8
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通讯作者：
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青藏高原冻融过程中高山生态系统退化对土壤温度的影响
DOI：
10.1007/s00254-008-1417-7
发表时间：
2009-05-01
期刊：
ENVIRONMENTAL GEOLOGY
影响因子：
--
作者：
Hu, Hongchang;Wang, Genxu;Wang, Junfeng
通讯作者：
Wang, Junfeng