The rates of soil N mineralization at soil depths of 0-15, 15-30, 30-45 and45-60 cm and moisture regimes were measured at three sand-fixation plantations of Pinus sylvestrisvar. mongolica by laboratory aerobic incubat...The rates of soil N mineralization at soil depths of 0-15, 15-30, 30-45 and45-60 cm and moisture regimes were measured at three sand-fixation plantations of Pinus sylvestrisvar. mongolica by laboratory aerobic incubation method. The results showed that average rates ofsoil net N-mineralization across soil depth varied from 1.06 to 7.52 mg · kg^(-1)·month^(-1) atsoil depths from 0 to 60 cm. Statistical analyses indicated that the effects of different soildepths, moistures and their interactions on net N-mineralization rates were significant (P < 0.05).The net N-mineralization rates significantly decreased with increasing soil depths and at depth 0-15cm accounted for 60.52% of that at depth of 0-60 cm. There was no difference in soil netN-mineralization rates between half and fully-saturated water treatments, however these rates weresubstantially higher than that without water treatment (P < 0.05). The factors influencing Nmineralization process have to be studied further in these semiarid pine ecosystems.展开更多
早子沟金矿位于秦岭造山带西段夏河—合作断裂带上,矿区成矿作用与岩浆热液及断裂构造关系密切,矿区岩浆岩内石英中含有大量熔体包裹体及流体包裹体,显微测温结果显示,熔体包裹体均一温度范围为700℃-790℃,流体包裹体分为H2O-NaCl包裹...早子沟金矿位于秦岭造山带西段夏河—合作断裂带上,矿区成矿作用与岩浆热液及断裂构造关系密切,矿区岩浆岩内石英中含有大量熔体包裹体及流体包裹体,显微测温结果显示,熔体包裹体均一温度范围为700℃-790℃,流体包裹体分为H2O-NaCl包裹体、NaCl-H2O-CO2包裹体、H2O-CO2包裹体3种类型,包裹体均一温度范围为195℃-360℃,本文通过对熔体包裹体的研究,采用“熔体包裹体＋流体包裹体”的方法 ,估算矿区岩浆岩成岩压力为275MPa,依据断裂带流体垂直分带规律,计算得到早子沟金矿成岩深度为13.96km,成矿深度为2.10-6.02km,平均成矿深度为4.06km。表明矿区深部成矿找矿尚有很大潜力。应用刘斌及Ryzhenko and Bryzgalin推导的计算流体包裹体pH值及Eh值的公式,对矿区不同体系（类型）流体包裹体的pH值及Eh值进行了估算,其结果表明：早子沟金矿包裹体的pH值为2.25-5.88,成矿溶液为酸性,在成矿阶段pH呈升高的趋势;包裹体的Eh值为0.409-0.139V,成矿溶液体系从早期到晚期Eh呈逐渐降低的趋势。pH值及Eh值的这种变化趋势,均有利于矿区Au元素的沉淀富集。展开更多
基金This paper was supported by National Natural Science Foundation of China (30471377), the Chinese Academy of Sciences (Knowledge Innovation Project KZCX3-SW-418), and the Institute of Applied Ecology of Chinese Academy of Sciences (SLYQY0409).
文摘The rates of soil N mineralization at soil depths of 0-15, 15-30, 30-45 and45-60 cm and moisture regimes were measured at three sand-fixation plantations of Pinus sylvestrisvar. mongolica by laboratory aerobic incubation method. The results showed that average rates ofsoil net N-mineralization across soil depth varied from 1.06 to 7.52 mg · kg^(-1)·month^(-1) atsoil depths from 0 to 60 cm. Statistical analyses indicated that the effects of different soildepths, moistures and their interactions on net N-mineralization rates were significant (P < 0.05).The net N-mineralization rates significantly decreased with increasing soil depths and at depth 0-15cm accounted for 60.52% of that at depth of 0-60 cm. There was no difference in soil netN-mineralization rates between half and fully-saturated water treatments, however these rates weresubstantially higher than that without water treatment (P < 0.05). The factors influencing Nmineralization process have to be studied further in these semiarid pine ecosystems.
文摘早子沟金矿位于秦岭造山带西段夏河—合作断裂带上,矿区成矿作用与岩浆热液及断裂构造关系密切,矿区岩浆岩内石英中含有大量熔体包裹体及流体包裹体,显微测温结果显示,熔体包裹体均一温度范围为700℃-790℃,流体包裹体分为H2O-NaCl包裹体、NaCl-H2O-CO2包裹体、H2O-CO2包裹体3种类型,包裹体均一温度范围为195℃-360℃,本文通过对熔体包裹体的研究,采用“熔体包裹体＋流体包裹体”的方法 ,估算矿区岩浆岩成岩压力为275MPa,依据断裂带流体垂直分带规律,计算得到早子沟金矿成岩深度为13.96km,成矿深度为2.10-6.02km,平均成矿深度为4.06km。表明矿区深部成矿找矿尚有很大潜力。应用刘斌及Ryzhenko and Bryzgalin推导的计算流体包裹体pH值及Eh值的公式,对矿区不同体系（类型）流体包裹体的pH值及Eh值进行了估算,其结果表明：早子沟金矿包裹体的pH值为2.25-5.88,成矿溶液为酸性,在成矿阶段pH呈升高的趋势;包裹体的Eh值为0.409-0.139V,成矿溶液体系从早期到晚期Eh呈逐渐降低的趋势。pH值及Eh值的这种变化趋势,均有利于矿区Au元素的沉淀富集。
