The relationship between ENSO cycle and temperature, precipitation and runoff in the Qilian mountain area     

LAN Yongchao  DING Yongjian  KANG Ersi  ZHANG Jishi 《地理学报》2003,13(3):293-298

El Nino and La Nina are the events concerned internationally. The corresponding relationship between El Nino events, temperature, precipitation and runoff in the Qilian mountain area are analyzed according to the date from the weather and the hydrometric stations in the area, the results show that effects of El Nino events to temperature, precipitation and runoff are different in the different time and zones. When El Nino occurs, temperature rises, but precipitation and runoff decrease in the whole Qilian mountain area, especially in the east and middle parts of the area. Temperature rises, precipitation and runoff still decrease in the eastern Qilian mountain area in the next year El Nino occurring, but decrease extent is fewer. There are not obvious relationship between temperature, precipitation and runoff with El Nino events in the western Qilian mountain area.  相似文献   

根据土壤化学特征划分伏牛山亚热带北界   总被引：1，自引：0，他引：1  

马建华  许叔明  韩晋仙  ZHU Lianqi  Zhao Qingliang 《地理学报(英文版)》2003,13(3):299-304

The boundary between subtropical zone and temperate zone is not only important in physical geography, but also attractive in agricultural production. Seven soil profiles studied in this paper are placed along the southern slope of Funiu Mountain at different heights above sea level.Many compositions and properties of these soils have been determined in laboratory. In this paper,the laws of migration and accumulation of soil materials on the southern slope of Funiu Mountain are discussed first, then the division of the boundary between subtropical zone and temperate zone in this area according to soil geochemistry is discussed with qualitative methods and mathematical classification method in which twelve selected indexes such as Km, Saf, Ba, β, Feo/Fet, Mno/Mnt and so on are used. The result indicates that the boundary between subtropical zone and temperate zone on the southern slope of Funiu Mountain is about 950 m above sea level.  相似文献   

2001年昆仑山口西8.1级大震预报的再讨论   总被引：3，自引：1，他引：3  

郭增建  韩延本  吴瑾冰 《地震研究》2002,25(4):309-313

由立交模式、静中动判据和高山峰指标讨论了2001年昆仑山口西8．1级大震的地点骤报。由74年周期性、三性法和倍九律讨论了这个8．1级大震的时间预报。倍九律包括热红外异常、6级地震活动和K＝8的大磁暴在震前出现的倍九天时间特征。  相似文献   

Carbon cycling of alpine tundra ecosystems on Changbai Mountain and its comparison with arctic tundra   总被引：4，自引：0，他引：4  

代力民  吴钢  赵景柱  孔红梅  邵国凡  邓红兵 《中国科学D辑(英文版)》2002,45(10):903-910

The alpine tundra on Changbai Mountain was formed as a left-over ‘island’ in higher elevations after the glacier retrieved from the mid-latitude of Northern Hemisphere to the Arctic during the fourth ice age. The alpine tundra on Changbai Mountain also represents the best-reserved tundra ecosystems and the highest biodiversity in northeast Eurasia. This paper examines the quantity of carbon assimilation, litters, respiration rate of soil, and storage of organic carbon within the alpine tundra ecosystems on Changbai Mountain. The annual net storage of organic carbon was 2092 t/a, the total storage of organic carbon was 33457 t, the annual net storage of organic carbon in soil was 1054 t/a, the total organic carbon storage was 316203 t, and the annual respiration rate of soil was 92.9% and was 0.52 times more than that of the Arctic. The tundra-soil ecosystems in alpine Changbai Mountain had 456081 t of carbon storage, of which, organic carbon accounted for 76.7% whereas the mineral carbon accounted for 23.3%.  相似文献   

祁连L山主要植被下土壤水的时空动态变化特征   总被引：13，自引：1，他引：13  

牛云  张宏斌  刘贤德  张学龙  葛双兰 《山地学报》2002,20(6):723-726

通过对祁连山青海云杉林、祁连圆柏林、亚高山灌丛林、牧坡草地等4种主要植被类型的土壤水测量数据进行分析表明，土壤水的空间垂直动态表现为随深度的增加而减少，可划分为土壤水分易变层、利用层、调节层三个层次；土壤水的时间动态可划分为土壤失水期、聚水期、退水期、稳水期四个时期。土壤水总的特征是，不同植被地类的土壤水季节变化规律基本一致，主要受降水量及其分配的影响。  相似文献   

河南省连康山光萼苔科植物区系地理成分研究     

赵建成  崔彦伟  叶永忠  袁志良 《地理与地理信息科学》2002,18(4):107-110

该文在研究标本和文献的基础上,介绍河南省连康山自然保护区所产的光萼苔科(Porellaceae)植物2属8种,即光萼苔属Porella(7种)和多瓣苔属Macvicaria(1种)。讨论了它们的生境、识别特征和植物区系地理成分,并编制了河南省连康山自然保护区光萼苔科植物的分属、分种检索表。  相似文献   

衡山旅游客源市场的开发与营销对策研究   总被引：3，自引：0，他引：3  

刘玉桥 《热带地理》2002,22(4):350-354

分析了衡山旅游客源市场规模、时空分布规律和游客行为特征等旅游需求特征，在此基础上研究了衡山的旅游客源市场竞争机制和开发定位，提出了衡山旅游业可持续发展的旅游客源市场营销策略。  相似文献   

Patterns of Growth and Change: Depicting the Impacts of Restructuring in Idaho     

Gayla Smutny 《The Professional geographer》2002,54(3):438-453

Geographers and other social scientists investigating the impact of economic and demographic restructuring have tended to focus on urban metropolitan areas. There has been much less exploration of the local impacts of such change in largely nonmetropolitan locales. Many of these nonmetropolitan regions, however, are some of the fastest growing in the U.S. This article addresses this issue by examining, at the county level, economic and population trends in the state of Idaho. Generally recognized for its agricultural outputs (such as potatoes), Idaho experienced a population growth rate of 18.1 percent during the 1990s, making it one of the fastest growing states in the U.S. However, population growth and the associated changes in the local economy were unevenly distributed across the state. This article develops a typology of growth and change, indicating patterns of growth related to two predominant trends: high–tech footloose capital investment and amenity– and tourism–related residential development. Implications of this analysis for future research are discussed.  相似文献   

祁连山北麓不同海拔土壤化学计量特征     

高海宁  李彩霞  孙小妹  张勇  陈年来 《中国沙漠》2021,41(1):219-227

对祁连山中段冰沟流域土壤有机C、N、P含量垂直分布与化学计量特征及其影响因素进行研究。结果表明：冰沟流域土壤有机C、N、P含量在各样点随土层深度而降低,并在表层土中聚集较明显;在0—40 m土层中,土壤有机C、N、P平均含量随海拔升高总体呈现先增高后下降的趋势,在中、高海拔处最高,P含量变异较小。0—40 cm土层中土壤C/N在海拔3 128—2 814 m处高于其他海拔,在3 075 m处C/N最高,土壤C/N、C/P随海拔升高总体呈下降趋势,均在中高海拔处最高,而土壤N/P在海拔3 454 m处最高,在低海拔2 814 m处最低。不同植被类型土壤的C/N、N/P差异性不显著,而土壤SOC/P差异显著,3种植被类型影响土壤C/N和C/P的大小为乔木林>高山灌丛>高山草地,而土壤N/P为灌丛>乔木林>高山草地;植被类型、海拔是影响土壤C、N、P含量和化学计量比的主要因素,其次为盖度、坡向。  相似文献   

A full-scale field experiment to study the thermal-deformation process of widening highway embankments in permafrost regions     

ShuangJie Wang  Long Jin  Kun Yuan  DongGen Chen  JinPing Li  Yi Song 《寒旱区科学》2021,13(2):123-132

As one of the widely used upgrading way in road engineering, the widening embankment(WE) has suffered evident differential deformation, which is even severer for highway in permafrost regions due to the temperature sensitivity of frozen soil and the heat absorption effect of the asphalt pavement. Given this issue, a full-scale experimental highway of WE was performed along the Qinghai-Tibet Highway(QTH) to investigate the differential deformation features and its developing law. The continuous three years' monitoring data taken from the experimental site, including the ground temperature and the layered deformation of WE and original embankment(OE), were used to analyze the thermal-deformation process. The results indicate that the widening part presented the remarkable thermal disturbance to the existing embankment(EE). The underlying permafrost was in a noteworthy degradation state, embodying the apparent decrease of the permafrost table and the increase of the ground temperature. Correspondingly, the heat disruption induced by widening led to a much higher deformation at the widening side compared to the original embankment, showing a periodic stepwise curve. Specifically, the deformation mainly occurred in the junction of the EE and the widening part, most of which was caused by the thawing consolidation near the original permafrost table. In contrast, the deformation of EE mainly attributed to the compression of the active layer. Furthermore, it was the deformation origination differences that resulted in the differential deformation of WE developed gradually during the monitoring period, the maximum of which reached up to 64 mm.  相似文献