Sensitivity of penman-monteith reference crop evapotranspiration in Tao’er River Basin of northeastern China   总被引：1，自引：0，他引：1  

Liqiao Liang  Lijuan Li  Li Zhang  Jiuyi Li  Bin Li 《中国地理科学(英文版)》2008,18(4):340-347

A non-dimensional relative sensitivity coefficient was employed to predict the responses of reference crop evapotranspiration （ET0） to perturbation of four climate variables in Tao＇er River Basin of the northeastern China. Mean monthly ET0 and yearly ET0 from 1961 to 2005 were estimated with the FAO-56 Penman-Monteith Equation. A 45-year historical dataset of average monthly maximum/minimum air temperature, mean air temperature, wind speed, sunshine hours and relative humidity from 15 meteorological stations was used in the analysis. Results show that： 1） Sensitivity coefficients of wind speed, air temperature and sunshine hours were positive except for those of air temperature of Arxan Meteorological Station, while those of relative humidity were all negative. Relative humidity was the most sensitive variable in general for the Tao＇er River Basin, followed by sunshine hours, wind speed and air temperature. 2） Similar to climate variable, monthly sensitivity coefficients exhibit large annual fluctuations. 3） Sensitivity coefficients for four climate variables all showed significant trends in seasonal/yearly series. Also, sensitivity coefficients of air temperature, sunshine hours and wind speed all showed significant trends in spring. 4） Among all sensitivity coefficients, the average yearly sensitivity coefficient of relative humidity was highest throughout the basin and showed largest spatial variability. Longitudinal distribution of sensitivity coefficients for air temperature, relative humidity and sunshine hours was also found, which was similar to the distribution of the three climate variables.  相似文献   

Landscape Effects of Land Consolidation Projects in Central China——A Case Study of Tianmen City,Hubei Province     

GU Xiaokun DAI Bing CHEN Baiming 《中国地理科学(英文版)》2008,18(1):41-46

The goal of land consolidation in China is still to develop agricultural production. The study of landscape effects of land consolidation projects （LCPs） faces many difficulties because of the lack of government＇s interest and data. This paper, taking Tianmen City of Hubei Province in Central China as an example, presents a methodology for analyzing landscape effects of LCPs by GIS and Fragstats3.3. It describes landscape effects with indexes of Patch Density （PD）, Largest Patch Index （LPI）, Landscape Shape Index （LSI）, Interspersion and Juxtaposition Index （IJI）, Aggregation Index （AI）, and Shannon＇s Diversity Index （SHDI）, showing more regular shape, simpler structure and less habitat diversity after LCPs. It computes ten landscape indexes of four categories of patches including Cultivated Land, Road, Water Channel, and River and Pond. The indexes show that 1） cultivated land becomes more fragmental in patch area, less irregular in patch shape and more concentrated in block; 2） the transport capacity of roads and irrigation and drainage capacity of water channels have been improved; 3） the landscape change of river and pond can be summarized as decreasing scale, more regular shape, reducing connectivity and diversity of the class. LCPs can facilitate agricultural production as well as protect cultivated land and food security. However, it is doubted that the increase of cultivated land from LCPs results from the reducing in landscape diversity of water area.  相似文献   

土地开发整理中的环境质量评价体系探析   总被引：2，自引：0，他引：2  

刘军芳 《华北国土资源》2008,(3)

通过分析我国农田环境质量现状、土地开发整理的存在问题以及环境影响评价研究的国内外发展动态,对我国土地开发整理环境影响评价作了探讨,从而初步建立了土地开发整理环境质量评价指标体系,并确定了进行土地开发整理环境影响评价的方法。  相似文献   

新农村建设与村庄土地整理实施保障措施研究     

韩润仙 《华北国土资源》2008,(3)

针对目前新农村建设中各地进行新村建设后旧村仍旧存在的现状,从经济、技术、制度保障等几方面提出了要对旧村进行整理复垦相对应的措施和要求,从而为当前新形势下村庄土地整理实施提供了良好的建议和保障。  相似文献   

我国房地产价格的影响因素分析   总被引：2，自引：0，他引：2  

闫宏宏  朱红琼 《国土资源》2008,(5):58-60

房地产价格的讨论一直都是热门话题。影响我国房价的经济因素主要在于国民收入、土地价格、房地产投资和消费等方面,运用这些因素,采用模型分析方法,可以看出房地产投资是影响房价的重要原因。  相似文献   

规范登记制度落实土地权属——国土资源部有关负责人解读《土地登记办法》     

张晏 《国土资源》2008,(1):41-42

据国土资源部透露,《土地登记办法》(以下简称《办法》)将于2008年2月1日起正式实施。作为《物权法》实施之后的一部有关不动产登记的部  相似文献   

农村集体经济组织成员资格的确认是解决土地补偿费分配的前提     

李庆华  贾方彪 《国土资源》2008,(1):43-45

近年来,随着国民经济的发展和国家建设的需要,国家征收农村土地的数量逐年增加,随之而来的农村征地补偿纠纷案件逐年增加,这些的纠纷焦点往往凸现一个如何  相似文献   

南美及亚非部分国家土地冲突原因分析   总被引：1，自引：0，他引：1  

谭术魁 《国土资源》2008,(1):60-63

土地是解决民生温饱之基。自古人类社会矛盾就是建立在生产力和生产关系上的,一旦这种矛盾达到极度不平衡的时候,将导致战争的爆发。我国在社会主义发展阶段,必然会  相似文献   

深化土地制度改革不可久拖不决   总被引：2，自引：0，他引：2  

党国英 《国土资源》2008,(1):4-5

最近连续看到了几份关于农民为维护土地财产权所进行的集体活动的报道,心里不免沉重。尽管早知道土地维权是当今影响农村政治安定的  相似文献   

城市低收入人群住房     

《国土资源》2008,(3):46

国土资源部官员目前对此城市房地产成交量出现萎缩、房价有所回落的现象表示,这是土地政策、房地产政策、税收政策综合作用的结果。  相似文献