气候变暖使珠穆朗玛峰地区冰川处于退缩状态

９９７年中美联合考察队对珠穆朗玛峰绒布冰川考察期间,采用ＧＰＳ技术对冰川末端位置进行了测量．将其结果与１９６６年考察测量的位置对比得出,过去３０ａ间该冰川末端后退了１７０～２７０ｍ,平均年退缩量为５５～８７ｍ．由于目前气候仍在变暖,该冰川将继续保持退缩状态．     

山岳型旅游地国内客流时空特性--以黄山、九华山为例

在大量实地调查的基础上，以黄山、九华山旅游地为例，结合其他山岳型旅游地以及海滨型旅游地，分析了山岳型旅游地国内客流年际变化、季节变化、日分布等时间特性；对黄山、九华山国内客流空间结构演变进行了研究，得出了其客源市场稳定、客源市场集中度降低、客源吸引力增强、客源市场呈波浪式推进和跳跃式增长的演变结论；提出了山岳型旅游地发展的基本对策。     

Reconstruction of summer temperature (June-August) at Mt. Helan, China, from tree-ring stable carbon isotope values since AD 1890

From stable carbon isotope analysis of tree-rings of Chinese pine (Pinus tabulaeformis) from Mt. Helan, China, we found that high-δ13C values were related to high mean temperatures from June to August (T68), and low-δ 13C values corresponded to low T68. From these data, a transfer function has been used to reconstruct summer temperatures (T68) for the Mt. Helan region. The explained variance of reconstruction is 34.9% (F=15.01, p<0.001). The time period containing the highest summer temperatures in northern China (late 1920-1930s) was confirmed by our reconstruction. The data indicate that there is a tele-connection between summer temperatures in Mt. Helan area and sea-surface-temperatures in the tropical Pacific. The extreme low temperature periods around the years of 1920 and 1947 for Mt. Helan region correspond well to the cold climate in the tropical Pacific. Along with other analyses, this suggests that climate variations in the Mt. Helan region are driven not only by local events, but also by the global climate. Significant periodicities appearing in the reconstruction are 2.56 and 2.63 years.     

Statistical analysis of earthquake activity at Etna volcano (March 1981 eruption)

Seismic activity that preceded, accompanied, and followed the 17–23 March 1981 Etnean eruption has been statistically analyzed.On the grounds of both time evolution of seismicity and catalogue completeness, three time intervals have been defined (12 February–2 March, 12–17 March, 19–31 March) and for each of these periods both the b coefficient of theGutenberg-Richter's (1956) relationship and the E parameter of the cluster size (Shlien andToksoz, 1970) have been calculated.No significant variations were observed between the first and third periods, while lower values of bothb andE coefficients were found in the second one. These findings might indicate that changes in the seismicity features occur just before the eruption start.Small but fast variations in the stress field acting on the volcano might originate this type of seismic activity, while the importance of the tectonic control on volcanic phenomena seems to be confirmed.     

以全球参照系为基准的珠峰地区重力场

珠穆朗玛峰位于欧亚板块和印度板块边缘的碰撞地带 ,地壳运动活跃 ,地形复杂。三十余年来 ,我国曾单独或与国外合作在珠穆朗玛峰及其北部毗邻地区进行了五次 (196 6、1975、1992、1998和 1999年 )大规模的大地测量工作 ,其中包括天文、重力、平面、高程和气象等测量工作。根据这些大地测量成果以全球参照系为基准 ,对该地区的重力场进行了研究。提出了适用于该地区的推估重力异常、垂线偏差和高程异常的最佳技术方案和相应成果     

安徽大别山南麓柑桔冻害分布模式的研究

本文将地形因子参数化,建立了柑桔冻害低温与测点海拔高度、遮蔽度、山体遮蔽长度和地势倾斜度之间的数量关系。     

西藏南迦巴瓦峰地区第四纪环境探讨

本文根据西藏南迦巴瓦峰地区第四纪沉积物特征和孢粉分析结果,讨论了环境变化问题。指出,中更新世以来南峰地区抬升约2000—3000米,全新世抬升约600米,并对气候变化作了论述。     

四川龙门山区早泥盆世Emsian期群落古环境分析

通过对群落特征生物构造、生态习性、成活曲线、赋存围岩沉积及群落构成内容等特征分析,本文认为四川龙门山区Emsian期地层已经识别的以腕足动物为主的八个底栖群落生态位集中于B.A.3,少数可归入B.A.2,其相当的沉积环境主要为浅海内陆棚相、台地生物礁相。     

各拉丹冬峰东冰川冰、雪、水地球化学特征

论述了长江之源各拉丹冬峰东坡的尕日曲流域冈加曲巴冰川和水晶矿冰川冰、雪、水样品中的ｐＨ值、总碱度、总硬度、矿化度，以及Ｋ＋，Ｎａ＋，Ｃａ（２＋），Ｍｇ（２＋）和Ｃｌ－，ＳｉＯ２等可溶性离子的含量，同时讨论了其水化学组成类型．     

哈尔克山西段中浅变质岩系变形解析及构造地层

通过构造地层和构造解析的研究，确定哈尔克山西段上奥陶－下泥盆统中浅变质岩系经历了推覆剪切→推覆强变形→近南北挤压收缩三期变形。前两期以推覆平卧褶皱组合为特点，形成韧性变形带，第三期变形最终形成轴面直立的开阔褶皱。本区构造形态以推覆岩片大量叠置、平卧与尖棱倒转褶皱复合为特征，属板块聚合带成分。变形研究表明，塔里木西北缘构造运动早期以由南向北的韧性推覆为主。