梵净山土壤甲螨群落结构与多样性调查

在梵净山自然保护区不同坡向、不同海拔设置了5个样地,于不同季节对其土壤甲螨群落状况进行调查,共记录到土壤甲螨45科81属;并对不同样地中甲螨群落结构和多样性进行分析.调查结果表明,Oppiella、Xylobates、Suctobelbella是该保护区优势类群,而Suctobelbella是梵净山自然保护区比较独特的优势类群.各样地土壤甲螨群落多样性依次为:东坡海拔750 m样地(A)＞西坡海拔1 500 m样地(D)＞东坡海拔1 500 m样地(B)＞西坡海拔750 m样地(C)＞金顶海拔2 200 m样地(E).E样地海拔最高,Malaconothrus在该样地数量剧增;样地C受人为干扰影响较大,Masthermannia数量明显增多;样地D个体数量为5个样地中最多. A、D样地甲螨群落相似性指数最高,为0.836 1;C、E样地甲螨群落最不相似,相似性指数为0.613 6.低等甲螨类群丰富,所占比例较高.另外,人为干扰对土壤甲螨的群落结构和多样性影响较大.     

浅析华宁玉珠水泥有限公司石灰岩矿高品质石灰岩与沉积环境的关系

矿区地处建水台隆(Ⅰ^1-2 3)区,矿体赋存于下二叠统茅口组第三层(P1m3)地层中。石炭纪至二叠纪时期,本区经历了一个完整的海进,海退旋回,而海平面的升降影响高品质石灰岩的分布和变化。     

大坂山不同海拔高寒植被物种多样性研究

[目的]研究大坂山不同海拔高寒植被的物种多样性.[方法]对祁连山山脉东段大坂山高、中、低(3 025、3 405、3 813 m)3个不同海拔的植物群落进行调查,并比较分析了3个不同海拔高度植被的丰富度、多样性指数.[结果]随着海拔的逐渐升高,其植物丰富度逐渐减小;植物群落物种多样性在中海拔相对较低;群落相似性随着海拔的升高而降低,群落的β多样性具有明显的变化.[结论]海拔梯度造成的环境因子的变化以及人类干扰是造成不同海拔高度物种分布格局发生变化的重要原因.     

对西藏自治区昌都县昂青矿区地质特征及成矿原因分析

昂青矿区位于西藏自治区昌都地区昌都县妥坝乡,地处昌都县三河一江地区(昂曲、扎曲、色曲、澜沧江),属中深切割区。工作区最高海拔5078m,最低4412m,相对高差660多m,地表多为基岩裸露或被坡积、残积、冰积砾石、碎石流所覆盖,植被较少,山麓局部地带,零星分布有草甸及灌木。海拔在4500m以下的地区多为灌木和草甸所覆盖。本文对昂青矿区地质特征及矿床成因进行了研究探讨。     

山区土地流转——在城乡统筹中的实践探索

重庆作为全国统筹城乡综合配套改革试验区,自然条件较差,北、东、南三面为山区,大娄山由北入渝,至南部隆起;大巴山脉呈西北--东南走向;山地区域分布较广,占全市面积的85%,最高海拔3000m;而且喀斯特地貌分布也很广泛,有典型的石林、峰林、溶洞、暗河、峡谷等地貌.     

安定区西花沟村彭河社建筑用砂矿地质特征

彭河社建筑用砂矿位于安定区西巩驿镇花沟村一带的西贡河河道中,地形地貌属陇西黄土高原中部西巩河侵蚀堆积形成的河谷平原地貌.海拔最高1765 m,最低1738 m,最大相对高差27 m,属于典型的大陆性气候,属陇中北部冷温带半干旱气候区.本区矿石结构主要为松散砂状结构、角砾状结构,无胶结,疏松.主要为厚层状构造:单层厚在1...     

川西高山松林火烧迹地天然更新研究

[目的]研究川西高山松林火烧迹地的天然更新状况.[方法]通过"空间序列"代替"时间序列"的研究方法对川西高山松林火烧迹地进行了调查研究.[结果]火烧迹地上高山松天然更新效果较好,一般火烧的次年即有大量幼苗发生.同时一定频率低强度的火烧有利于高山松纯林的维持和稳定,这主要是因为该地区高山松分布于阴坡和半阴坡;灌木高山松林火烧迹地天然更新状况较好,草类高山松林火烧迹地次之,高山栎高山松林火烧迹地最差;分布在海拔2800～3600 m的高山松林火烧迹地自然恢复良好,但海拔4000 m以上的火烧迹地上更新的幼苗幼树较为稀少;阴坡、半阴坡迹地天然更新状况优于阳坡迹地,这是因为周围的温度、湿度等环境条件变动幅度直接影响着高山松更新幼苗的成活率.[结论]该研究为加快当地植被恢复、改善环境及建设长江上游生态屏障提供了理论依据.     

修文县花椒引种的农业气候相似诊断分析

根据欧氏距离的相似距离系数方法,利用温度、降水和日照资料,从年内热量、降水等几方面计算了修文县和贞丰花椒区的相似程度,确定相似等级,并通过时引种源地与目标地的花椒生态气候状况的对比分析,找出了修文花椒生态气候和品质比较优势以及存在的问题.结果表明:花椒在县境内海拔1 300 m以上地区虽可种植,但受冬末春初低温天气影响较大,产量不稳定;海拔在1 300 m以下地区为境内花椒稳产区.花椒产量和品质的形成受气候、土壤、栽培管理措施等诸多因素的影响.该研究结果可为修文农业结构调整和退耕还林扩大花椒种植面积提供气候依据.     

藏羚羊的生存现状与保护

藏羚羊(Pantholops hodgsoni)又名藏羚、长角羊、羚羊,是青藏高原的特有物种,主要生活在海拔4 000～6 000 m,分布在青藏高原腹地--青海、新疆、西藏三省交界的可可西里.20世纪80年代中期以来,其数量一度锐减到75 000只,被列为我国十大濒危动物之一.为拯救这一物种,我国相继将藏羚羊栖息地辟为自然保护区,开展广泛宣传教育,建立管理机构,开展执法、巡护、打击盗猎活动等.     

五味子栽培技术

五味子多生于杂木林中,山沟溪流两岸小乔木及灌木丛间.缠绕溪流两岸的小乔木及灌木丛间.缠绕其它树木上.五味子是单性花,但也有两性花的,它是雌、雄同株,但也有异株现象.     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.