贡嘎山东坡亚高山森林区蒸散力的估算

以海螺沟 30 0 0m气象站的观测资料为基础 ,运用Penman公式法　空气饱和差法和桑斯维特公式法 ,计算了贡嘎山东坡亚高山林林的年平均蒸散力 ,其结果为分别为 431 81mm、171 4mm和 44 6 4mm。通过分析蒸散力的影响因素 ,对这三种计算蒸散力的方法作了比较 ,对计算结果存在的差异作了比较合理的解释 ,认为用Penman公式法可以估计出本研究区的蒸散力。同时 ,对蒸散力及其影响因自进行了相关分析 ,指出湿度和风不是速制约研究区蒸散力的主导因子 ,并分析了蒸散力与水面蒸发的关系 ,由此推导出估算蒸散力的简便方程 :PE =6 6 77 0 6 91E60 1 0 75 1ITm 0 0 396Pm。     

Numerical modeling of 3-D terrain effect on MT field

Using the boundary element method, the numerical modeling problem of three-dimensional terrain effect on magnetotelluric (MT) field is solved. This modeling technique can be run on PC in the case of adopting special net division. The result of modeling test for 2-D terrain by this modeling technique is basically coincident with that by 2-D modeling technique, but there is a great difference between the results of 3-D and 2-D modeling for 3-D terrain. Project supported by the National Natural Science Foundation of China.     

五台山冰缘地貌植物群落的数量分类与排序

在野外样方调查的基础上,采用双向指示种分析法(TWINSPAN)和除趋势对应分析法(DCA)对五台山冰缘地貌植被进行了数量分类和排序研究,将五台山冰缘地貌植被分为13个群丛,13个群丛是不同冰缘地貌生态景观的重要组成要素,各群丛的群落学特征与冰缘地貌生境有密切的生态关系。DCA样方排序结果和种排序结果表明,五台山冰缘地貌植物群落分布格局是土壤、水分、热量等综合环境因子决定的。而不同冰缘地貌上植物群丛优势种的分布格局在很大程度上决定着植物群丛类型的分布格局,反映出植物群落类型和物种分布随冰缘地貌类型及环境梯度变化的趋势。     

平顶山金矿床黄铁矿化学成分特征及其找矿意义

本文依据21件黄铁矿样品的电子探针成分分析数据,讨论了Au,Ag,Fe,Co,Ni,S,As,Sb,Cu,Te,Sn,Se等13个元素在黄铁矿中的含量和S/Fe,As/Sb比值在时间和空间上的变化规律。对矿体上的黄铁矿单晶体进行的能谱扫描电镜成分分析,Fe,S,As等成分在黄铁矿内部呈环带状分布,由晶体中心向边缘,它们的含量呈脉动式变化,反映成矿热液活动频繁。     

中国东部第四纪自然环境演化及庐山“冰碛层”堆积时期的自然环境研究

根据第四纪地层内孢粉组合和动物群等新资料恢复了我国东部各大区域第四纪各个时期的自然环境特征,其温暖期与干冷期的交替与深海沉积O~(18)温度变化趋势大致对应。庐山三次“冰期冰碛层”内孢粉组合表明均为温暖湿润针阔叶混交林景观,而不是寒冷的冰川环境。     

对我国35年来珠峰高程测定成果的思考

20世纪60年代以来，我国曾单独或与外国合作，在1966年，1975年，1992年，1998年及1999年对珠穆朗玛峰高程进行了5次测定，开展了大规模的大地测量外业作业、数据处理和科学研究，其中包括天文、重力、平面、高程和气象等方面。本文对我国近35年来的珠峰高程测定的成果和最新进展作分析研究，将我国35年来所精确测定的珠峰峰顶雪面高程值取中数，以我国60(似)大地水准面为基准面，得珠峰海拔高为8849.0m±0.5m；若以接近全球高程系统的EGM96大地水准面为基准面，珠峰海拔高为8850.1m±0.5m。     

Discussion and Reply Lithostratigraphic revision and correlation of the Oligo‐Miocene Murray Supergroup,western Murray Basin,South Australia

Sequence‐stratigraphic interpretations of the 4200 m‐thick Palaeoproterozoic (1700–1650 Ma) Mt Isa Group and underlying Surprise Creek Formation identify three unconformity‐bounded packages termed the Prize, Gun and Loretta Supersequences. Siliciclastic rocks of the Surprise Creek Formation and Warrina Park Quartzite comprise the Prize Supersequence. Rapid facies changes from proximal, conglomeratic fluvial packages to distal, fine‐grained and deep‐water, rhythmites characterise this supersequence. Conglomeratic intervals in the Mt Isa area reflect syndepositional movement along basin‐margin faults during the period of supersequence initiation. A major unconformity, which extends over a period of about 25 million years, separates the Gun and Prize Supersequences. In the Leichhardt River Fault Trough uplift and incision of Prize sedimentary rocks coincided with emplacement of the Sybella Granite (1671±8 Ma) and Carters Bore Rhyolite (1678±2 Ma) and the removal of an unknown thickness of Prize Supersequence section. Deep‐water, turbiditic rhythmites of the Mt Isa Group dominated the Gun and Loretta Supersequences. Tempestites are present over discrete intervals and represent times of relative shallowing. High accommodation and sedimentation rates at the base of the Gun Supersequence resulted in the deposition of transgressive nearshore facies (uppermost Warrina Park Quartzite) overlain by a thick interval of deep‐water, siltstone‐mudstone rhythmites of the Moondarra Siltstone and Breakaway Shale. With declining rates of siliciclastic sedimentation and shallowing of the succession, calcareous sediments of the Native Bee Siltstone prograded over the deeper water deposits. Two third‐order sequences, Gun 1 and 2, characterise these lower parts of the Gun Supersequence. An increase in accommodation rates near the top of the Native Bee Siltstone in Gun 3 time, resulted in a return to deep‐water sedimentation with deposition of dolomitic rhythmites of the Urquhart Shale and Spear Siltstone. The Pb–Zn–Ag ore‐hosting interval of the Urquhart Shale is interpreted to occur in progradational highstand deposits of the Gun 3 Sequence. In the Leichhardt River Fault Trough the Loretta Supersequence boundary forms a correlative conformity. Coarser grained and thicker bedded sediments of the Kennedy Siltstone comprise lowstand deposits at the base of this cycle. These sediments fine up into the transgressive, deep‐water, siliciclastic facies of the Magazine Shale, which in turn are truncated against the Mt Isa Fault.     

珠峰北坡绒布河谷大气二氧化碳浓度低值观测

In the summers of 2006 and 2007, the atmospheric CO2 concentration and the wind speed in the Rongbuk Valley on the northern slope of Mt. Everest were measured by an ultrasonic anemometer with an Li-7500 CO2/H2O gas analyzer. The average CO2 concentration was 370.23±0.59 and 367.45±1.91 ppm in June of 2006 and 2007, respectively. The values are much lower than those at sites with similar latitudes and altitudes worldwide. The observed atmospheric CO2 concentration in Rongbuk Valley can be affected by the transportation of prevailing down-valley winds from the up-valley direction to the observation site. Our results suggest that the Mt. Everest region could be ideal for background atmospheric and environmental studies.     

1970-2007年西藏念青唐古拉峰南、北坡冰川显著退缩

1999年和2007年夏季,利用GPS技术先后对念青唐古拉峰(念峰)南、北坡的5条冰川末端位置进行了实地测量.结果表明:同1970年比较发现,过去近40 a来5条冰川退缩显著,1970-2007年间念峰北坡的拉弄和扎当冰川与南坡的爬努冰川末端平均退缩速率均接近10.0 m.a-1;西布冰川在1970-1999年间达到38.9 m.a-1,而爬努冰川流域海拔较高的小冰川5O270C0049退缩幅度较小,为4.8 m.a-1.2007年野外观测发现,爬努冰川1970年代的积累区有冰面河形成.念峰周围的冰川变化,不仅仅是末端的显著退缩,而且消融区面积也在扩大.