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A triaxial deformation apparatus with 3 GPa molten salt medium pressure vessel was developed to study the mechanical behavior of the rock under high temperature and ultra-high pressure. It is based on the conventional Griggs design and the molten salt cell concept is after the concept of Green and Borch (1989) and Rybacki et al (1998). The pressure vessel is improved with respect to systems described previously by the use of different salt mixtures with low eutectic temperatures, and by a mechanically stable arrangement of the thermocouples. In this study, we focus on the temperatures distribution around the sample under confined pressure of 500 MPa. The experimental results show that there is a good linear correlation between temperatures monitored by the upper thermocouple (at the upper 1/3 position of the sample center, outside the sample) and others. Based on the linear slopes, we can identify temperature difference in positions of sample. The temperature difference between the upper and the lower thermocouple (at the lower 1/3 positon of the sample center, outside the sample) is so small that both of them can be used as temperature controller for the heating system. The temperature in the center of the sample is by 4% lower than the ones monitored by the upper thermocouple. The temperature in the bottom of the sample is by 5% lower than that in the center of the sample. The temperature in the lower quarter of the sample is by 2% lower than that in the center of the sample. The temperature distribution in the sample show that vertical temperature gradient in the sample is constant (16 ℃/mm at 900 ℃). The temperature controlling resolution and temperature distribution in the pressure vessel are similar to the same type apparatuses in other laboratories of the world.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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