Soil organic matter fractions under different vegetation types in permafrost regions along the Qinghai-Tibet Highway, north of Kunlun Mountains, China

Shang, Wen; Zhao, Lin; Wu, Xiaodong; Li, Yuqiang; Yue, Guozhen; Zhao, Youpeng; Qiao, Yongping

doi:10.1007/s11629-014-3372-y

Cited by 16 publications

(19 citation statements)

References 53 publications

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“…It is critical to fractionate SOM into its different transformation and stability phases because the phase predetermines the vulnerability of SOM to environmental changes (Shang et al, ). Sequential density fractionation minimally alters SOM compounds with consistent results (Gregorich & Janzen, ).…”

Section: Methodsmentioning

confidence: 99%

Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai‐Tibet Plateau

Chen

Lei

et al. 2019

JGR Biogeosciences

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Soils in the Qinghai‐Tibet Plateau are young in terms of development and form a thin, skeletal soil layer because the gravel parent materials are glaciofluvial deposit, eluvium, and fluvial sediment, which are extremely sensitive to global climate change. The lack of understanding of soil organic matter (SOM) transformation processes in this region hinders the prediction of SOM stocks under future climate conditions. In this study, SOM transformation processes were investigated by density groupings and pyrolysis‐gas chromatography/tandem‐mass spectrometry (Py‐GC–MS/MS) in five alpine ecosystems: alpine desert, alpine grassland, alpine meadow, alpine wetland, and alpine forest. The roles of microbial community in different density fractions were elucidated. Soil samples were separated into three fractions with NaI solution: labile fraction (FL; ρ ≤ 1.6 g/cm3), moderate fraction (FM; 1.6 < ρ < 2.25 g/cm3), and recalcitrant fraction (FR; ρ ≥ 2.25 g/cm3). The following results were obtained. (1) The ratios of different fractions (FM/FL, FR/FM, and FR/FL) indicated the transformation processes of SOM, and ratios less than 1 represented degradation. The transformation processes were similar in alpine grassland and meadow and were similar in alpine desert, wetland, and forest but differed from each other. (2) Fungi preferred to degrade plant detritus, which mainly affected FL, whereas bacteria chiefly affected FM. (3) Precipitation altered vegetation type and soil pH, thus affecting communities and microorganism activities and resulting in the above differences. These findings highlight the importance of understanding the limited transformation processes of SOM in ecosystems to predict the impact of climate change on SOM preservation.

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Section: Methodsmentioning

confidence: 99%

Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai‐Tibet Plateau

Chen

Lei

et al. 2019

JGR Biogeosciences

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“…It suffers from the multiple effects of global drying and warming [23,24], massif uplifts [25,26] and human activities (such as over-grazing, tourism development and engineering construction). As a result, many ecological deterioration phenomena have been noted, such as rising snow lines [27], glacier recession [28][29][30], loss of soil organic matter [31,32] and desertification [33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Responses of Ecosystem Service to Land Use Change in Qinghai Province

2016

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Qinghai Province has a very fragile ecological environment and is an important component of the Qinghai-Tibet Plateau. To understand the disturbance caused by human activities to the local ecological system, it is necessary to evaluate the response of ecological service functions to land use change in Qinghai Province and to uncover the sensitivity of ecological service functions to land use change. This study uses a proxy-based method and proposes a sensitivity index to describe the degree of ecological service function response to the land use change in Qinghai Province. The findings were as follows.

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“…The soil texture, especially clay and silt fractions, and SM are the most important factors contributing to the variations in soil organic content on the QTP (Wu et al, ). Vegetation and SM mutually influence each other (Shang et al, ). Higher SM combined with lower soil temperature in the alpine swamp meadow may be associated with a lower decomposition rate, which in turn leads to higher soil organic matter content (Shang et al, ; Wu et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Vegetation and SM mutually influence each other (Shang et al, ). Higher SM combined with lower soil temperature in the alpine swamp meadow may be associated with a lower decomposition rate, which in turn leads to higher soil organic matter content (Shang et al, ; Wu et al, ). For example, the higher soil organic carbon content assessed using laboratory measurements at QT03 may be explained by the higher SM (Shang et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…The large discrepancies exist in the soil organic content and soil texture that obtain from CLDAS and the laboratory measurements (Tables and ). The field work shows that 85% of the soil is sand at the depth of 0–7 cm at QT04 (Shang et al, ). The CLDAS assimilation models may not well represent the high sand content (45.2%), which causes the overestimation of the surface SM at QT04 (Table ).…”

Section: Discussionmentioning

confidence: 99%

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Assessment of reanalysis soil moisture products in the permafrost regions of the central of the Qinghai–Tibet Plateau

Qin

et al. 2017

Hydrological Processes

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The long‐term and large‐scale soil moisture (SM) record is important for understanding land atmosphere interactions and their impacts on the weather, climate, and regional ecosystem. SM products are one of the parameters used in some Earth system models, but these records require evaluation before use. The water resources on the Qinghai–Tibet Plateau (QTP) are important to the water security of billions of people in Asia. Therefore, it is necessary to know the SM conditions on the QTP. In this study, the evaluation metrics of multilayer (0–10, 10–40, and 40–100 cm) SM in different reanalysis datasets of the European Centre for Medium‐Range Weather Forecasts interim reanalysis (ERA‐Interim [ERA]), National Centers for Environmental Prediction Climate Forecast System and the Climate Forecast System version 2 (CFSv2), and China Meteorological Administration Land Data Assimilation System (CLDAS) are compared with in situ observations at 5 observation sites, which represent alpine meadow, alpine swamp meadow, alpine grassy meadow, alpine desert steppe, and alpine steppe environments during the thawing season from January 1, 2011, to December 31, 2013, on the QTP. The ERA SM remains constant at approximately 0.2 m3⋅m−3 at all observation sites during the entire thawing season. The CLDAS and CFSv2 SM products show similar patterns with those of the in situ SM observations during the thawing season. The CLDAS SM product performs better than the CFSv2 and ERA for all vegetation types except the alpine swamp meadow. The results indicate that the soil texture and land cover types play a more important role than the precipitation to increase the biases of the CLDAS SM product on the QTP.

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Soil organic matter fractions under different vegetation types in permafrost regions along the Qinghai-Tibet Highway, north of Kunlun Mountains, China

Abstract: organic mat an importa and soil pr carbon (C) different SO microbial b and analyze permafrost in the No samples we types -A meadow (A (AD) -at

Cited by 16 publications

References 53 publications

Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai‐Tibet Plateau

Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai‐Tibet Plateau

Responses of Ecosystem Service to Land Use Change in Qinghai Province

Assessment of reanalysis soil moisture products in the permafrost regions of the central of the Qinghai–Tibet Plateau

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