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Effect of Wet Settlement on Mercury in alpine soil in Mercury Mining Area

Pedosphere 1995年第4期5卷 379-381页

作者： HEJIN－LIN TANHONG GuizhouResearchCentreofPhysicalTestingandChemicalAnalysis Guiyang550002China GuizhouResearchCentreof

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关键词： alpine soil gaseons Hg wet settlement

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Study on the impact of vegetation degeneration to hydrology characteristic of the alpine soil

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Research in Cold and Arid Regions 2011年第3期3卷 233-242页

作者： YiBo Wang QingBai Wu FuJun Niu GenXu Wang HuiYan Cheng Laboratory of Frozen soils CoM and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou Gansu 730000 China College of Earth and Environment Science Lanzhou University Lanzhou Gansu 730000 China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu Sichuan 610041 China Lanzhou University of Technology Lanzhou Gansu 730000 China

alpine soil infiltration process is an important part of the hydrological characteristics of alpine soil in permafrost. This research is carried out in the source region of the Yellow River where the permafrost is severely degraded, using various methods for choosing typical sample areas, and to experiment, study and simulate the soil water curve, soil saturated hydraulic conductivity, soil infiltration and soil moisture under different characteristics of degraded vegetation. The results indicate that the empirical equation θ=AS-B, proposed by Gradner and Visser, is very reliable in simulating the soil moisture curve; soil saturated hydraulic conductivity and soil infiltration are significantly different under different vegetation coverage： in the soil surface within 0-10 cm, the saturated hydraulic conductivity and infiltration intensity of Black Beach are the strongest; respectively, in soil layers below 30 cm, vegetation has almost no impacts on the saturated hydraulic conductivity, infiltration intensity and soil moisture content. Significant reduction of soil moisture occurs in soil surfaces with degraded vegetation. The more serious the degradation, the more water loss, and it can be up to 38.6% in the worst situation. soil moisture of developed vegetation root systems in depths within 10-20 cm has the greatest impact on the soil environment, and the loss of moisture induces difficulty in the restoration of degraded meadows. Through a comparative study, the Kostiakov infiltration equationf（t） = at-b is more applicable for studies on the process of soil moisture infiltration of the alpine meadow in the source region of the Yellow River.

关键词： vegetation degradation alpine soil foil infiltration

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Characterizing Subzero-Temperature Thermal Properties of Seasonally Frozen soil in alpine Forest in the Western Sichuan Province, China

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Journal of Water Resource and Protection 2016年第5期8卷 583-593页

作者： Hui Sun Shuai Liu Jihong Qin Department of Environmental Science and Engineering Sichuan University Chengdu China Institute of soil Science Chinese Academy of Sciences Nanjing China Department of Environmental Engineering College of Urban and Rural Construction Chengdu University Chengdu China

Seasonally frozen soil in alpine and subalpine zones in the mountains of Qinghai-Tibetan Plateau is particularly sensitive to global climate change. Therefore, a better understanding of the thermal properties of frozen soil is crucial for predicting the responses of frozen soils to soil warming. In this study, thermal properties of frozen soil with different moisture contents under subzero temperature (0°C - 20°C) in an alpine forest in western Sichuan were analyzed by KD2 Pro in its cooling and heating processes, respectively. Our results reveal that the soil apparent volumetric specific heat capacity (Cv) and apparent thermal conductivity (K) under the same water content show similar response patterns to changing temperature lower than -2°C in both heating and cooling processes. Moreover, ice content of frozen soils can be well predicted by Logistic model in cooling and heating processes. The Cv and K tend to increase along with increasing soil moisture contents. Remarkably, asymptotic characters of the value of Cv and K are at the vicinity of the initial temperature of phase transitions, indicating that both Cv and K are particularly sensitive to changing soil temperature at the range of -2°C to 0°C. Therefore, the widely distributed frozen soil layers with temperature above -2°C in alpine and subalpine zones over Qinghai-Tibetan Plateau are susceptible to the observed climate warming during cold season.

关键词： alpine soil Seasonally Frozen soil Thermal Properties Qinghai-Tibetan Plateau

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