微山湖小型底栖生物群落结构的初步研究

于2009年8月在微山湖取样进行了小型底栖生物的调查研究．结果表明,夏季小型底栖生物平均丰度为341±132ind·10cm^-2,平均生物量为152．7±58．0μgdwt·10cm^-2．共鉴定出5个小型底栖生物类群．其中,按丰度自由生活线虫为最优势类群,比例达97．9％;其他类群依次为桡足类、介型类、甲壳类幼体和动吻类．小型底栖生物分布在2～5cm的次表层沉积物的比例为61．1％,线虫分布在2～5cm的比例为61．7％．本研究为进一步了解小型底栖生物群落、种类组成,以及为淡水底栖生态系统结构和功能的深入研究提供参考．     

高原矿区地下水资源调查评估及利用

西藏玉龙铜矿矿区对地下水资源的研究及利用程度低,通过实地调查及观测并结合前人资料,对该矿区地下水类型及其富水性进行初步分析评估,圈定地下水富水地块,提出矿山开发利用地下水的建议.     

柴达木盆地东部地区古生界烃源岩研究

从有机碳含量、可溶有机质含量及其转化率、热解参数、饱和烃的生物标志化合物特征、饱和烃单体烃碳同位素分布特征等方面 ,综合分析了柴达木盆地东部地区古生界各时代岩样的有机质丰度、类型和成熟度 ,并对其生烃潜力进行了评价。研究结果表明 :①古生界岩样的有机质丰度变化较大 ,其中 ,石炭系泥岩可能为比较好的生油岩 (须证实 ) ,石炭系灰岩在部分地区 (如羊肠子沟石灰沟和德令哈北 )也可能为烃源岩 ,而其他古生界层系可能不是本区有利的烃源岩 ;②烃源岩的有机质类型为Ⅰ ,Ⅱ型干酪根 ,且大多达到成熟—高、过成熟阶段 ;③烃源岩多数为强还原环境下沉积的海相碳酸盐岩、泥页岩 ,部分为海陆过渡相的弱氧化至弱还原环境沉积。     

单晶Co~(2+):MgGa_2Se_4光学吸收谱的理论解释

该文考虑了d电子t2g轨道和eg 轨道局域性差别的影响 ,并计及Racah参量A对光谱跃迁的贡献 ,导出了 3d7电子组态在Td 对称下的哈密顿矩阵公式 .从理论上研究了Co2 + :MgGa2 Se4 中Co2 + 离子的吸收光谱 ,理论结果与实验结果吻合很好 .     

Altitudinal patterns of abundances and parasitism in frugivorous drosophilids in west Java,Indonesia

Abundances and parasitism rates of frugivorous drosophilid flies were studied in three localities at altitudes of 250–1350 m in and near Bogor, Indonesia. The drosophilid and parasitoid species were classified into four groups: low-altitude species, high-altitude species, species abundant at a mid-altitude location and species occurring rather evenly from low to high locations. The ananassae and immigrans species groups were major drosophilids collected. All species of the ananassae species group were more abundant at lower altitudes, and the parasitism rate in this species group decreased with increasing altitude. Thus, the host abundance seems to affect the parasitism rate. On the other hand, the rate of parasitism in the immigrans species group showed no apparent relation with altitude or density, possibly due to the fact that species of this species group varied in altitudinal distribution. It is also suggested that the diversity of drosophilid species affects the composition of parasitoid species.     

Rediscovery,natural history,and conservation status of Idiocranium russeli Parker, 1936 (Amphibia: Gymnophiona: Indotyphlidae)

The indotyphlid caecilian amphibian Idiocranium russeli Parker, 1936 is the only nominal species in its genus. Apart from two additional, largely overlooked locality records that we consider to be of an undescribed species, I. russeli is known with certainty from only a single collection of c.50 specimens from a single locality in 1933. We report new material from fieldwork in 2012 carried out in the vicinity of the type locality. Digging surveys at 34 sites for a total of >2000 person minutes found 50 I. russeli at 15 of these sites, extending the known range of the species by more than 40 km south and from an elevation of c.670 m to 104–820 m. The species probably occurs in nearby Nigeria and in some protected areas, is tolerant of some human disturbance, and is likely to move from Data Deficient to Least Concern on the IUCN Red List. Males have relatively longer and wider heads than females. Total length measured for preserved specimens is less than for freshly anaesthetized specimens, by up to 14.1%. Previously, preserved I. russeli were reported as having a maximum length of 114 mm, but the new sample includes specimens with total lengths of 145 mm in preservation and 167 mm when fresh. The sex of the smallest independent specimens (total length 62 mm in preservation) could be determined from examination of the gonads, hatchlings are c.30 mm, and I. russeli is confirmed as one of the smallest known caecilian species.     

一种基于高斯马尔可夫随机场模型的混合像元分解方法

传统的混合像元分解模型只考虑了光谱信息,而忽略了空间相关信息的利用.事实上遥感影像以及分解后获得的组分影像都具有空间自相关关系.本研究提出利用高斯马尔可夫随机场模型来描述组分空间相关的特性,构建一种综合利用影像光谱和空间信息的混合像元模型,以提高混合像元分解精度.利用模拟与真实的数据证实了本文方法的有效性,一定程度上能...     

ASI法测定土壤有效Zn、Cu、Fe、Mn与植物吸收的相关性研究

本文应用ASI法测定我国北方主要耕地土壤的有效态zn、cu、Fe、Mn,根据测定值高低分别选取各土壤类型的十个土壤样本进行植物栽培的微量元素试验．结果表明,ASI—Zn、Cu、Fe、Mn测定值与小麦生物量均没有达到显著相关水平（n=40,P〉0．05）;ASI—Cu、Fe测定值与小麦吸收量均没有达到显著相关水平（n=40,P〉0．05）,ASI-Zn、Mn测定值与植物吸收量达到显著相关水平（n=40,P〈0．05）．以土壤ASI法临界值的2．5倍为补充土壤微量元素量,小麦吸收zn是有效且合理的,但是小麦吸收cu、Fe和Mn是无效的,表明ASI法的土壤微量元素丰缺指标在我国北方农田土壤应用尚需进一步研究．     

有效烃源岩的识别方法

有效烃源岩的识别和评价是含油气系统和油气成藏研究的基础。以往常用有机碳含量下限 (0 .5 % )作为烃源岩是否有效的判识标志。东营凹陷沙河街组厚达 10 0 0～ 15 0 0m的暗色泥岩的有机碳含量大于 0 .5 % ,因此长期以来人们把其作为有效烃源岩。对东营凹陷进行精细的油源对比发现 ,其有效烃源岩绝未达到 10 0 0m之厚 ,对油气藏真正有贡献的主要为沙四上和沙三下亚段有机碳含量在 1.5 %以上的烃源岩 ,它们控制了东营凹陷各亿吨级大油田的形成。因此 ,有效烃源岩下限标准的确立 ,应以研究区的实际情况而定 ,可首先通过油源对比确立有效烃源岩层段 ,然后运用测井方法删除非烃源岩夹层 ,并获取烃源岩的各项评价参数 ,从而完成有效烃源岩的识别和评价工作。     

硒对新城疫免疫雏鸡红细胞免疫功能的影响

采用鸡红细胞免疫复合物RBC-IC花环、鸡红细胞受体（RBC-CR1）花环及RBC-CR1花环促进试验,通过饮水给硒的方式,探讨硒对新城疫免疫雏鸡红细胞免疫粘附功能及其免疫粘附促进因子活性的影响。试验结果表明：各组平均血清硒含量变化与给硒剂量一致;各试验组红细胞免疫粘附功能及其血清中的免疫粘附促进因子的活性均较对照组为高。