The soil respiration rate was measured with an IRGA in the natural Larix gmelinii forest of the Northern Great Xing’anling Mountain in the cool temperate zone.The environmental factors were recorded using the weather...The soil respiration rate was measured with an IRGA in the natural Larix gmelinii forest of the Northern Great Xing’anling Mountain in the cool temperate zone.The environmental factors were recorded using the weather equipment.The soil respiration showed obvious diurnal variation and a total 706 gC·m-2 was released during the plant growth period(May.1th～Oct.31th).The soil respiration rate was influenced significantly by soil tempeture in this zone,and a significant postive correlation was found between soil respiration rates and soil tempetures in 10 cm depth（r=0.879 5）.However the soil respiration was not significantly influenced by the soil moisture.Furthmore,there was a negative relationship between the soil respiration rate and air CO2 contiontration of the air in forest（r=-0.426 1）.The results from the experiment can provide the basical materials for the calculation of carbon flux in the northern cool temperate zone of China.展开更多
One of the key issues facing the global society today is to find renewable and sustainable energy sources. Hydrogen has gained much attention in recent years since it is one of fuels for fuel cells. It emits no carbon...One of the key issues facing the global society today is to find renewable and sustainable energy sources. Hydrogen has gained much attention in recent years since it is one of fuels for fuel cells. It emits no carbon dioxide when it is used and so on. In this study, a great rate production of high pressure hydrogen rich gas from glycerol/water/metal mixtures was developed since glycerol has become one of the enormous industrial by-products, especially from biodiesel processing plants. It was found that cobalt was the optimum metal additive among tested metals of aluminum, cobalt, magnesium and nickel in terms of a hydrogen producing rate, a hydrogen partial pressure and a conversion ratio from 50 mol% glycerol/water mixtures under an operating temperature of 723 K. Concretely, hydrogen rich gas with concentration about 64%<sub>H<sub>2</sub></sub> and high partial pressure about 4 MPa<sub>N,H<sub>2</sub></sub> could be produced at the great producing rate of 42.9 L<sub>N,H<sub>2</sub></sub> dm<sup>-2</sup>min<sup>-1</sup> and high conversion ratio about 60%<sub>H<sub>2</sub></sub>. All the produced hydrogen rich gases from glycerol/water/metal mixtures were by no means inferior to pure hydrogen as a fuel for the polymer elec-trolyte fuel cell.展开更多
文摘The soil respiration rate was measured with an IRGA in the natural Larix gmelinii forest of the Northern Great Xing’anling Mountain in the cool temperate zone.The environmental factors were recorded using the weather equipment.The soil respiration showed obvious diurnal variation and a total 706 gC·m-2 was released during the plant growth period(May.1th～Oct.31th).The soil respiration rate was influenced significantly by soil tempeture in this zone,and a significant postive correlation was found between soil respiration rates and soil tempetures in 10 cm depth（r=0.879 5）.However the soil respiration was not significantly influenced by the soil moisture.Furthmore,there was a negative relationship between the soil respiration rate and air CO2 contiontration of the air in forest（r=-0.426 1）.The results from the experiment can provide the basical materials for the calculation of carbon flux in the northern cool temperate zone of China.
文摘One of the key issues facing the global society today is to find renewable and sustainable energy sources. Hydrogen has gained much attention in recent years since it is one of fuels for fuel cells. It emits no carbon dioxide when it is used and so on. In this study, a great rate production of high pressure hydrogen rich gas from glycerol/water/metal mixtures was developed since glycerol has become one of the enormous industrial by-products, especially from biodiesel processing plants. It was found that cobalt was the optimum metal additive among tested metals of aluminum, cobalt, magnesium and nickel in terms of a hydrogen producing rate, a hydrogen partial pressure and a conversion ratio from 50 mol% glycerol/water mixtures under an operating temperature of 723 K. Concretely, hydrogen rich gas with concentration about 64%<sub>H<sub>2</sub></sub> and high partial pressure about 4 MPa<sub>N,H<sub>2</sub></sub> could be produced at the great producing rate of 42.9 L<sub>N,H<sub>2</sub></sub> dm<sup>-2</sup>min<sup>-1</sup> and high conversion ratio about 60%<sub>H<sub>2</sub></sub>. All the produced hydrogen rich gases from glycerol/water/metal mixtures were by no means inferior to pure hydrogen as a fuel for the polymer elec-trolyte fuel cell.
