Effects of grazing intensity on soil thermal properties and heat flux under Leymus chinensis and Stipa grandis vegetation in Inner Mongolia, China

2012 ◽  
Vol 118 ◽  
pp. 147-158 ◽  
Author(s):  
L. Gan ◽  
X. Peng ◽  
S. Peth ◽  
R. Horn
Keyword(s):  
Heat Flux ◽  
Thermal Properties ◽  
Inner Mongolia ◽  
Grazing Intensity ◽  
Leymus Chinensis ◽  
Soil Thermal Properties

Response of soil moisture and temperature to grazing intensity in a Leymus chinensis steppe, Inner Mongolia

2010 ◽  
Vol 340 (1-2) ◽  
pp. 89-102 ◽  
Author(s):  
Ying Zhao ◽  
Stephan Peth ◽  
Agnieszka Reszkowska ◽  
Lei Gan ◽  
Julia Krümmelbein ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Inner Mongolia ◽  
Grazing Intensity ◽  
Leymus Chinensis ◽  
Leymus Chinensis Steppe

Greenhouse gases fluxes and soil thermal properties in a pasture in central Missouri

2010 ◽  
Vol 22 (7) ◽  
pp. 1029-1039 ◽  
Author(s):  
Nsalambi Vakanda Nkongolo ◽  
Shane Johnson ◽  
Kent Schmidt ◽  
Frieda Eivazi
Keyword(s):  
Thermal Properties ◽  
Greenhouse Gases ◽  
Soil Thermal Properties

Analytical Model to Predict Nonhomogeneous Soil Temperature Variation

1995 ◽  
Vol 117 (2) ◽  
pp. 100-107 ◽  
Author(s):  
M. Krarti ◽  
D. E. Claridge ◽  
J. F. Kreider
Keyword(s):  
Thermal Properties ◽  
Soil Temperature ◽  
Temperature Variation ◽  
Analytical Model ◽  
Soil Surface ◽  
Deep Soil ◽  
Soil Thermal Properties ◽  
Order Of Magnitude ◽  
Soil Surface Temperature ◽  
Annual Time

This paper presents an analytical model to predict the temperature variation within a multilayered soil. The soil surface temperature is assumed to have a sinusoidal time variation for both daily and annual time scales. The soil thermal properties in each layer are assumed to be uniform. The model is applied to two-layered, three-layered, and to nonhomogeneous soils. In case of two-layered soil, a detailed analysis of the thermal behavior of each layer is presented. It was found that as long as the order of magnitude of the thermal diffusivity of soil surface does not exceed three times that of deep soil; the soil temperature variation with depth can be predicted accurately by a simplified model that assumes that the soil has constant thermal properties.

Response of plant functional traits of Leymus chinensis to extreme drought in Inner Mongolia grasslands

Plant Ecology ◽  
2018 ◽  
Vol 220 (2) ◽  
pp. 141-149 ◽  
Author(s):  
Xiyuan Yue ◽  
Xiaoan Zuo ◽  
Qiang Yu ◽  
Chong Xu ◽  
Peng Lv ◽  
...  
Keyword(s):  
Functional Traits ◽  
Inner Mongolia ◽  
Plant Functional Traits ◽  
Extreme Drought ◽  
Leymus Chinensis

The Primary and Secondary Analysis of Uncertain Factors in Soil Thermal Properties for GSHP

2012 ◽  
Vol 614-615 ◽  
pp. 688-694 ◽  
Author(s):  
Yi Wang ◽  
Guo Min Shen
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Water Table ◽  
Unsaturated Soil ◽  
Solid Phase ◽  
Saturated Soil ◽  
Soil Thermal Conductivity ◽  
Saturation Degree ◽  
Soil Thermal Properties ◽  
Soil Solid Phase

In this paper, at first, an effective soil thermal conductivity model was established. Single factor regression analysis for 6 uncertain factors contained in the model was then conducted respectively. Finally, the primary and secondary characters of these uncertain factors were analyzed by using the orthogonal test. The analysis results show that the effective soil thermal conductivity has linear relationships with the saturation degree of unsaturated soil and the depth of water table and has power function relationships with other 4 uncertain factors; the porosity of unsaturated soil has the greatest effect on the effective soil thermal properties, followed by saturation degree of unsaturated soil, porosity of saturated soil, solid phase thermal conductivity of unsaturated soil, solid phase thermal conductivity of saturated soil and the depth of water table.

The Use of Serpentine Earth Coils in Ground Coupled Heat Pump Systems

1984 ◽  
Vol 106 (4) ◽  
pp. 438-446
Author(s):  
P. D. Metz
Keyword(s):  
Thermal Properties ◽  
Heat Pump ◽  
Research Program ◽  
Undisturbed Soil ◽  
Heat Rejection ◽  
Term Operation ◽  
The Earth ◽  
Soil Thermal Properties ◽  
Coil Performance ◽  
Ground Coupled Heat Pump

A research program at Brookhaven National Laboratory (BNL) has studied ground coupling, i.e., the use of the earth as a heat source/sink or storage medium for solar-assisted and stand-alone heat pump systems. As part of this research program, five serpentine earth coil experiments were operated between December 1978 and September 1981. Heat was added to or removed from the earth coils according to weekly schedules based on computer simulations of solar-assisted and stand-alone, ground-coupled heat pump systems operated in the local (New York) climate. Each earth coil was operated according to a different control strategy. This paper presents experimental results from these experiments for the period December 1978 to April 1981, and compares these results to those generated by a comptuer model, GROCS, developed at BNL. The model is found to provide a reasonably good fit to the data, for the most part, using the experimental undisturbed soil thermal properties. In some cases, the use of a lower soil thermal conductivity provides a better fit, particularly during summer months when heat was added to the ground. Thus, given soil properties, GROCS can be used to predict earth coil performance. If given earth coil performance, the model can predict soil thermal properties. Serpentine earth coils are found to be suitable to provide auxiliary heat or heat rejection for solar heat pump systems. In fact, earth coil-based, stand-alone, ground-coupled heat pump systems can provide all heat needed for winter space heating and all heat rejection required for summer space cooling with no need for any auxiliary heating. Subfreezing winter operation is necessary for shallow earth coils in cold climates. No deleterious effects to the ground were observed from the long-term operation of these experiments.

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