Policy and Practice Progress of Watershed Eco-compensation in China   总被引：2，自引：0，他引：2  

ZHANG Huiyuan LIU Guihuan WANG Jinnan WAN Jun 《中国地理科学(英文版)》2007,17(2):179-185

The ecological protection of the watersheds in China is being confronted with a lot of problems such as soil and water erosion, water pollution at present. Therefore watershed eco-compensation is becoming a question of common interest. Based on the analyses of the major problems and their origins in the watershed protection in China, the paper discusses the concerned policies including relative rules and laws, financial policies and water right transaction policies. Simultaneously the paper reviews the practices carried out in China, including the ecological construction project in the western China, the trans-provincial eco-compensation practice and the small watershed eco-compensation practice. According to the present situation of eco-compensation practices and the future policy requirement, this paper finally puts forward four key problems to be solved in the watershed eco-compensation of China in the future.  相似文献   

A VLBI study of 20 southern extragalactic radio sources     

Zhi-qiang Shen  Tong-shan Wan  Xiao-yu Hong  Dong-rong Jiang  Shi-guang Liang 《Chinese Astronomy and Astrophysics》1996,20(4):415-425

This paper describes a 5 GHz VLBI survey in the southern hemisphere. The first observation of 23 extragalactic radio sources was conducted in November 1992. Twenty VLBI images were obtained, of which 15 sources show core-jet structure, one has a two-sided jet, and three sources are unresolved. No compact double source was found. Eleven of the 16 sources with core-jet (including a two-aided jet) show evidence of jet bending. In addition, four sources appear to be superluminal, of which three sources are new.  相似文献   

Light scattering by an inhomogeneous spherically symmetric cometary atmosphere: Solar flux impinging on the nucleus head     

S. J. Wilson  F. S. Wan 《Earth, Moon, and Planets》1983,29(1):1-6

The generalized Eddington approximation, obtained by the three-stream division of the radiation field, is used to compute the intensity falling on the nucleus head of a spherically-symmetric comet illuminated by parallel solar radiation.  相似文献   

Environmental records of lacustrine sediments in different time scales: Sediment grain size as an example   总被引：2，自引：0，他引：2  

CHEN Jing’an  WAN Guojiang  David Dian Zhang  ZHANG Feng & HUANG Ronggui . State Key Laboratory of Environmental Geochemistry  Institute of Geochemistry  Chinese Academy of Sciences  Guiyang  China  . Department of Geography  Geology  University of Hong Kong  Pokfulam Road  Hong Kong  China 《中国科学D辑(英文版)》2004,47(10):954-960

Understanding the past is the key to know thepresent and to predict the future. As a core project ofthe International Geosphere Biosphere Program, PastGlobal Changes (PAGES) aims to reconstruct theevolution history of global climate, global environ-ment and global ecosystem with resort to all kinds ofnatural records, so as to reveal the change rules(change processes, change amplitude and change rate)of the global environment and thus provide scientificbasis for predicting climate changes p…  相似文献   

Progress in the Study of Deep Profiles of Tibet and the Himalayas (INDEPTH)   总被引：5，自引：0，他引：5  

ZHAO Wenjin  ZHAO Xun  SHI Danian  LIU Kui  JIANG Wan  WU Zhenhan  XIONG Jiayu  ZHENG Yukun Chinese Academy of Geological Sciences  Beijing 《《地质学报》英文版》2004,78(4):931-939

This paper introduces 8 major discoveries and new understandings with regard to the deep structure and tectonics of the Himalayas and Tibetan Plateau obtained in Project INDEPTH, They are mainly as follows. (1) The upper crust, lower crust and mantle lithosphere beneath the blocks of the plateau form a "sandwich" structure with a relatively rigid-brittle upper crust, a visco-plastic lower crust and a relatively rigid-ductile mantle lithosphere. This structure is completely different from that of monotonous, cold and more rigid oceanic plates. (2) In the process of north-directed collision-compression of the Indian subcontinent, the upper crust was attached to the foreland in the form of a gigantic foreland accretionary wedge. The interior of the accretionary wedge thickened in such tectonic manners as large-scale thrusting, backthrusting and folding, and magmatic masses and partially molten masses participated in the crustal thickening. Between the upper crust and lower crust lies a large detachment (e.g  相似文献   

甘肃省农村民居抗震设防现状与地震安全农居示范工程对策   总被引：3，自引：2，他引：1  

张守洁  王兰民  吴建华  高晓明  贺建雄  汤爱华 《震灾防御技术》2006,1(4):345-352

本文根据甘肃省农村社会经济发展和地震环境特征,简要分析了甘肃农村民居主要建筑结构类型和抗震性能,结合近10多年来破坏性地震资料,总结了农村民居主要震害特点,提出了实施甘肃省农村民居地震安全工程的对策与措施。  相似文献   

中国汽车空调行业HFC-134a需求和排放预测   总被引：1，自引：0，他引：1       下载免费PDF全文

胡建信  万丹  李春梅  张剑波  易旭 《气候变化研究进展》2009,5(1):1-06

 近年来HFC-134a作为中国汽车空调行业CFC-12制冷剂最主要的替代品,其消费量增长迅速,是中国消费量最大的HFCs（氢氟烃类物质）。以2005年为基线,通过制冷剂替代、技术进步、熟练操作和政策控制等情景假设,预测了中国汽车空调行业HFC-134a的需求量及排放量。结果表明：到2010和2015年,汽车空调HFC-134a的消费量将分别接近2.0万和3.5万t,排放量将分别接近1.6万和3.0万t,约折合排放21.0 和39.0 Mt CO₂当量。上述排放相对基线情景（即维持当前政策措施和不开展回收活动）,2010年和2015年减排温室气体分别为6.7 和13.0 Mt CO₂当量。  相似文献   

不同陆面方案对沪宁高速公路团雾的模拟   总被引：7，自引：3，他引：4  

万小雁  包云轩  严明良  袁成松  钱玮 《气象科学》2010,30(4):487-494

利用沪宁高速公路实时监测的气象数据分析了2007年11月24日发生在沪宁高速公路镇江段团雾过程的气象要素变化。通过WRF模式耦合三种不同陆面方案对此次过程进行了数值模拟,旨在检验WRF模式耦合陆面方案对镇江段团雾的模拟能力。结果表明:(1)WRF模式模拟出的团雾天气过程对陆面方案的选择比较敏感,耦合了不同陆面参数化方案后的试验结果更接近实况。(2)水汽参量模拟结果中,SLAB方案比NOAH方案和RUC方案效果好些,NOAH方案与RUC方案差异不大。(3)在地面感热通量变化率模拟上,三者有些区别;在长波辐射变化率模拟上,NOAH方案较优越。(4)在涡度场高值区模拟上,NOAH方案效果比SLAB、RUC方案更好。  相似文献   

冬季亚洲大陆年际热力差异与中国气候的关系   总被引：3，自引：1，他引：2  

梁红丽  晏红明  肖子牛  万云霞 《气象科学》2010,30(6):754-762

利用DB16小波对50 a来南亚—东北亚热力差异时间序列进行分析,其周期变化主要集中在3.5 a以下的高频振荡时域内,其次年代际变化也是相对明显的。在此基础上通过尺度分离方法,将亚洲大陆热力差异中的年际和年代际时间尺度进行分离,进一步研究了年际尺度上亚洲大陆热力差异的变化特征及其与中国夏季降水的关系。结果表明年际尺度上亚洲大陆热力差异与亚洲冬夏季风和中国夏季降水同样有一些联系:强(弱)热力差指数年对应的冬夏季风存在差异,中国夏季降水分布类似于第1(3)类雨带。另外,强(弱)指数年夏季东亚季风涌、对流活动分布等的变化均呈现出有利于中国北方降水偏多(偏少)的特征。  相似文献   

基于LDM的乡镇雨量数据分中心的设计与实现     

王敏  张艳玲  刘静  贾平平  王婉 《气象与环境科学》2010,33(Z1)

针对河南省乡镇雨量数据库服务器和雨量查询WEB服务器在有降水过程时经常会因访问压力过大而出现网站瘫痪的情况,根据乡镇雨量数据时效性高的特点,鉴于LDM系统在数据传输过程中的时效性和完整性,建立了基于LDM系统的乡镇雨量数据分中心.乡镇雨量数据分中心由雨量入库软件、乡镇雨量数据库和雨量查询网站构成.使用结果表明,雨量入库软件能及时将获取的雨量数据文件入库;查询(历史或实时)雨量时,访问乡镇雨量中心的速度要快于访问省局乡镇雨量网站的速度.  相似文献