Comparative Study on Antioxidant Systems of Polygonum Viviparum Grown at Two Different Altitudes

Study on the antioxidant systems of Polygonum viviparumgrown at two different altitudes indicated plants grown at Haibei Research Station at 3200 m altitude as compared with plants grown in Xining at 2300 m altitude had apparently higher contents of ultroviolet-absorbing compounds and ascorbic acid, and significantly higher activities of superoxide dismutase, peroxidase and ascorbic peroxidase. Higher contents of superoxide radical anions and malonadehyde were also found in plants at Haibei Research Station as compared with the plants grown in Xining which have been transplanted from Haibei Research Station for at least four years. The differences in antioxidant system reflect a long term of time of adaptation to different environments.

草毡寒冻雏形土CO_2释放特征

研究了植物生长季节海北高寒草甸生态系统高寒嵩草草甸覆被下草毡寒冻雏形土的 CO2 释放速率。其结果表明：CO2 释放速率有明显的日变化和季节动态。日最大排放速率多出现在 1 4 :0 0～ 1 6:0 0时 ,最小排放速率在 6:0 0～ 8:0 0时。植物生长季日最大振幅为 797.75mg/m2·h,最小振幅 1 97.33mg/m2·h。CO2 排放白天大于夜晚。不同物候期 CO2 释放速率不同,其顺序为草盛期>枯黄期>返青期。生长季土壤CO2释放速率的范围是4 41 .72 mg/m2 · h± 1 55.2 9mg/m2· h,最大日均值为 681 .0 6mg/m2 · h( 7月 1 6日 )，最低值176.65 mg/m2 · h(6 月1 日)。退化草地土壤CO2 释放速率明显低于未退化草地, 生长季平均日均值低137.47 mg/m2 · h。相关分析表明: 土壤CO 2 排放速率与气温、地表温度、土壤5cm、10cm、15cm、20cm、30cm 地温均呈显著和极显著相关关系。温度是影响土壤CO2 释放速率的主要因子。

捕食干扰对 Myospalax baileyi 种群繁殖力的影响

采用去除法对高原鼢鼠种群繁殖力的变化进行了研究。结果表明, 在未受干扰的种群内有50% 的雌性成体不参与繁殖, 其平均胎仔数3.4只, 种群受干扰后其成体鼠的比例下降, 幼体鼠的比例相对提高, 繁殖鼠的比例和平均胎仔数均相应增加, 随着干扰程度的加剧, 其繁殖力也明显增加。土壤硬度和杂类草生物量决定了高原鼢鼠的种群密度, 而种群密度是影响繁殖力的主要因素, 未受捕食干扰的种群其数量接近于环境容纳量, 由于密度作用使其繁殖力较低, 而在捕食干扰的种群中由于密度降低, 种群内压力减少, 使种群的繁殖力增加。

Seasonal regulations of energetics, serum concentrations of leptin, and uncoupling protein 1 content of brown adipose tissue in root voles (Microtus oeconomus) from the Qinghai-Tibetan plateau

Survival of small mammals in winter requires proper adjustments in physiology, behavior and morphology. The present study was designed to examine the changes in serum leptin concentration and the molecular basis of thermogenesis in seasonally acclimatized root voles (Microtus oeconomus) from the Qinghai-Tibetan plateau. In January root voles had lower body mass and body fat mass coupled with higher nonshivering thermogenesis (NST) capacity. Consistently, cytochrome c oxidase activity and mitochondrial uncoupling protein-1 (UCP1) protein contents in brown adipose tissues were higher in January as compared to that in July. Circulating level of serum leptin was significantly lower in winter and higher in July. Correlation analysis showed that serum leptin levels were positively related with body mass and body fat mass while negatively correlated with UCP1 protein contents. Together, these data provided further evidence for our previous findings that root voles from the Qinghai-Tibetan plateau mainly depend on higher NST coupled with lower body mass to enhance winter survival. Further, fat deposition was significantly mobilized in cold winter and leptin was potentially involved in the regulation of body mass and thermogenesis in root voles. Serum leptin might act as a starvation signal in winter and satiety signal in summer.

内蒙古龙头山Ag-Pb-Zn多金属矿床成矿模式及找矿模型

The recent years research indicated that middle-south section of Da Hinggan Mountains metallogenic belt has two periods(Hercynian and Yanshanian) characteristics of metallogenesis, as well as the most of ore deposits in the area closely relate to Permian strata. Longtoushan ore deposit discovered in 2004 is an Ag-Pb-Zn polymetallic ore deposit born in Permian and located in the east hillside of the metallogenic belt, which has considerable resources potentials. It has important research value for its good metallogenic location and blank research history. Base on the detail field geology studies, the geology characteristics of "two stages and three kinds of metallogensis" has established. According to further work through geochemistry research including trace element, REE, S, Pb and Sr isotope, as well as petrography, microtemperature measurement, Laser Raman analysis and thermodynamics calculation of fluid inclusion, origin and characteristic of the ore-forming material and fluid has been discussed. And a new technology of single pellet Rb-Sr isochrones has been tried for dating its born time. Bae on above work, study of ore deposit comparison has been carried out, and metallogesis controlling factor and geological prospecting symbol have been summarized. Finally, metallogenic model and prospecting model have been established. According to above, the next step work direction has been proposed. Main achievement of the paper are listed as follow: 1.Longtoushan ore deposit has experienced two metallogenic periods including hot-water sedimentation period and hydrothermal reformation period. There are three kinds of metallizing phase: bedded(or near-bedded) phase, vein-shaped phase and pipe-shaped phase. The mian metallogenic period is hot-water sedimentation period. 2.Ore deposit geochemistry research indicated that the metal sulfides have charcateristic of hot-water sedimentation metallogensis, but generally suffered later hydrothermal transformation. The barite mineral isotope content is homogenous, showing the seabed hot-water sedimentation origin characteristic. Wall rock, such as tuff is one of metallogenic material origins. Both of Pb model age and Rb-Sr isochrone research older age value than that of strata, possibly for been influenced by hydrothermal transformation, and interfusion of ancient basis material. 3.There are two kinds of main metallogenic fluid inclusion in barite of the Longtoushan ore deposit, which are rich gas phase( C type) and liquid phase (D type). Their size is 2～7um, and principal components is H2O. Both kinds of fluid inclusion have freezing point temperature -7.1～-2.4℃ and -5.5～-0.3℃, salinity 4.0～10.6wt% and 0.5～8.5wt%, homogeneous temperature 176.8～361.6℃ and 101.4～279.9℃, which peak value around 270℃ and 170℃, respectively. Density of the ore-forming fluid is 0.73～0.97g/cm3, and metallogenic pressure is 62.3×105～377.9×105Pa. Above characteristic of the fluid inclusion are well geared to that of ore deposit originated in seabed hot-water sedimentation. 4.Through the comparison research, that Longtoushan ore deposit has main characteristic of hot-water sedimentation ore deposit has been indicated. Ore-forming control factor and prospecting symbol of it has been summarized, as well as metallogenic model and prospecting model. Next step work direction about prospecting has also been proposed finally.

贵州平坝县白云岩风化壳中稀土元素分布特征之初步研究

本文报道了平坝白云岩风化剖面风化前缘稀土元素超常规富集(总量达3％ 以 上)现象及其特征，并通过主元素、稀土元素的测定，结合白云岩中“酸不溶物”的提取和代表性样品的化学淋溶实验研究，讨论了白云岩风化壳剖面稀土元素的丹异特征．认为风化前缘稀土元素的富集是由3方面的因素共同作用造成的：1)对白云岩风化残积的继承；2)剖面上部一部分轻稀土淋滤聚积；3)碳酸盐岩中非均匀分布的原生含磷矿物风化产生的稀土磷酸盐矿物的聚集，后者是最重要的原因。

锑的表生地球化学行为与环境危害效应

锑(Sb) 是一种典型的有毒有害重金属元素。由于自然过程和人为活动的影响,锑及其化合物广泛分布于大气、土壤、水体等表生环境中,锑的环境污染日益严重。Sb 不是植物必需元素,但能够被植物体及农作物吸收。Sb 对人体和动物体产生慢性毒性及潜在致癌性。本文主要通过分析Sb 的主要矿物、锑及其化合物在表生环境中的分布与迁移特性,来阐述人体可能的锑暴露途径及由此产生的环境危害效应。

2．0GPa、室温至1200℃条件下斜长角闪岩的纵波速度及其衰减

利用YJ－3000t压力机，在2．0GPa、室温至1200℃条件下，测量了新疆库地地区斜长角闪岩的纵波速度（vp）和力学品质因子（Q值）。实验结果表明：斜长角闪岩的vp和Q值随温度的升高而降低，在升温的初始阶段，vp和Q值随温度下降的幅度较小，随着温度的升高其下降的幅度逐渐增大；由于斜长角闪岩的各向异性，导致了在三个方向上vp随温度而下降的幅度显著增大时的温度不同，其中x和y方向为812℃，z方向为673℃。而在各方向上的Q值随温度下降的幅度显著增大时的温度相差不大，约为812℃。观察回收的实验产物表明：当温度大于647℃时，产物中开始出现熔体，vp在x和y方向上的下降幅度没有明显的变化，而在x方向上的下降幅度增大；此时熔体对Q值的影响不大。当温度大于812℃时，产物中的熔体含量明显增多，vp和Q值下降的幅度都显著增大。据此认为，部分熔融是弹性波速度减小和衰减增大的主要原因.

Isotope Geochemistry of Gold Ore Deposits in the Gezhen Shear Zone, Qiongxi, Hainan Island

Gold deposits hosted in the Gezhen shear zone at Qingxi, Hainan Island occur in the Precambrian metamorphic rock series and are regionally developed in the N-E direction along the tectonic zone. From northeast to southwest are distributed the Tuwaishan-Baoban gold mining district, the Erjia gold mining district and the Bumo gold mining district, making up the most industrially important gold metallogenesis zone on the Hainan Island. Isotope geochemical studies of the typical gold deposits in this metallogen

卡拉麦里金矿带典型矿床——双泉金矿的地质地球化学特征及成因

双泉金矿是东准噶尔卡拉麦里金矿带中新近发现的一个中型构造蚀变岩型金矿床。矿床产于韧性剪切带中,赋矿地层为下石炭统南明水组地层,矿石类型主要为蚀变岩型。本文通过主要矿化阶段热液矿物毒砂成分的测定,利用相图中共生金属硫化物稳定温度范围得出主要矿化阶段的温度为300~450℃,它比通过石英流体包裹体测得的均一温度更准确地代表成矿流体的温度,由此温度平均值计算出的氢氢同位素能准确判断初始流体的来源。氢氢同位素的小范围内变化可能受成矿流体不同阶段温度的变化和组分变化的影响。综合地质地球化学资料表明,双泉金矿为与韧性剪切带有关的变质热液金矿床,韧性剪切带即为导矿构造和容矿构造;成矿物质可能主要来源于下石炭统南明水组中的火山岩和火山碎屑岩.

三类高强度悬式瓷绝缘子的成分和物相分析

为探讨高原牌70kN和进口120，210kN瓷绝缘子的成分和结构性能，文中采用原子吸收光谱（AAS）和X射线衍射（XRD）方法，对三类产品进行了检测。结果表明，有效成分除K2O外，70kN和210kN的SiO2,Al2O3,Fe2O3含量接近，主晶相基本相同，有刚玉，莫来石、石英和长石等；结晶相总量：70kN35%，120kN40%,210kN48%，这表明机械强度愈大，结晶相含量愈高，只需调整70kN原样的部分成分，粒度和工艺，即生产出高等级（如210kN)瓷绝缘子。

滇西上芒岗红色粘土型金矿常量元素地球化学

西上芒岗红色粘土剖面中常量元素的垂向分布研究表明，K20、 03、Al203在剖面中的变化一致，呈双 峰曲线变化，即在坡积带稍有富集、在残积带明显富集；而SiOz与铁、铝等在剖面中的变化相反。红色粘土与 矿区地层和矿化蚀变岩的常量元素对比分析表明了红色粘土可能来源于地层和矿化蚀变岩。常量元素之间 的相关性以及常量元素与金的相关性分析表明K20、F 03、Al203在红色粘土中为共生元素；金的富集主要受红 色粘土中褐铁矿和伊利石的吸附影响。红土化参数分析说明了红色粘土剖面经历两次红土化作用，残积带相 对于其它带经受过较强的红土化作用，但整个红色粘土剖面遭受的红土化作用不强，红土化程度低。仅处于粘 土化阶段。

辣椒氟平均含量及其影响因素研究

西南地区是我国燃煤污染型氟中毒流行最为严重的地区，同时也是我国主要辣椒优异种质资源的分布地之一。大量的研究已经证明，辣椒和玉米等食物在用煤火烘干过程中可以吸收富集燃煤过程释放到大气中的氟，因此由燃煤型氟污染引起的食物型氟中毒也不断受到关注。 国内外至今缺乏对辣椒氟的背景值、平均含量以及影响其含量变化的因素的系统研究，只有部分研究者对燃煤型地方性氟中毒地区的辣椒进行了零星的调查分析，所采样品具有很大的局限性，远远不能代表辣椒整体的氟含量水平；且国内外迄今尚无辣椒氟含量的卫生标准，由于辣椒与其他食物和蔬菜相比具有其特殊性，而目前国家有关食品中氟的限量标准（GB2762-2005）对辣椒而言明显不合适，因此只有在对辣椒中氟的含量进行充分调查研究，才能有针对性地制定出更为科学合理的卫生标准，才能为辣椒是否受到氟污染的判别及防止辣椒氟污染提供理论依据。本研究的目的、方法、结果及结论如下所示。 目的：调查我国西南部分地区新鲜辣椒及干辣椒的氟含量水平，了解辣椒中氟的分布规律，进而确定新鲜辣椒中氟的污染判别值并探讨辣椒氟污染的防治措施。方法：按照《食品中氟的测定》（GB/T 5009.18-2003）方法对采自西南77个县市的新鲜辣椒（176个）及干辣椒（296个）进行氟的含量测定，根据地区、辣椒品种、干燥方式、储存时间及赋存状态，对辣椒中氟的含量进行统计分析。结果：采自农田的新鲜辣椒氟的几何平均含量为8.9mg•kg-1（干重，176个样，置信度95％），干辣椒样品氟的几何平均含量为19.6mg•kg-1（干重，296个样，置信度95％）。结论：研究证实辣椒的干燥与储存方式不当是导致辣椒氟污染的主要原因；通过对新鲜辣椒中氟含量的研究，证实我国现行的食品中氟限量标准(GB2762-2005)并不适用于辣椒，建议以24.7mg•kg-1 (干重)、5.2mg•kg-1 (鲜重)为新鲜辣椒氟污染判别值。