基于城市化的中国能源消费前景分析及对碳排放的相关思考   总被引：3，自引：0，他引：3  

樊杰  李平星 《地球科学进展》2011,26(1):57-65

工业化和城市化是中国未来的两大发展趋势.以往对中国未来能源消费及碳排放的预测大都是从工业化层面出发,忽略了城市化过程导致的生活能源消费的巨大增量.推动城市化进程是提升生活质量、满足人的基本权利的重要手段;立足城市化进程,保障人均能源消费及碳排放空间是确保人人享有基本的生存权和发展权的重要基础.从对中国城市化进程的发展态...  相似文献   

Development of 57 novel polymorphic microsatellite markers in half-smooth tongue sole (Cynoglossus semilaevis)     

Guidong Miao  Ying Xu  Di Wang  Songlin Chen  Tingjun Fan  Yongsheng Tian 《中国海洋大学学报(英文版)》2011,10(3):241-245

Half-smooth tongue sole (Cynoglossus semilaevis) is a promising species for aquaculture in China.The wild population of C. semilaevis is under threat from environmental factors. Microsatellite markers are very suitable for assessing genetic diversity. Four microsatellite-enriched libraries of half smooth tongue sole (Cynoglossus semilaevis) were constructed,from which 57 polymorphic microsatellites were isolated and characterized.The polymorphism of these microsatellites was assessed by genotyping in 30 ind...  相似文献   

汶川地震灾后重建地区的人口容量分析     

高晓路  陈田  樊杰 《地理学报(英文版)》2011,21(3):521-538

Assessment of population carrying capacity is a key task in the reconstruction planning of areas struck by disasters, in which the precision of estimation is required. This study developed a decision-making model for estimating the population capacity of the involved townships and cities in the 2008 Wenchuan Earthquake based on the assessment of the suitability for reconstruction of the areas. Through analysis, arable land resources were argued to be the critical constraint of population capacity in these areas. Then, the spatial differentiations of the post-quake development conditions across different regions were analyzed with respect to their natural environments, socio-economic development and quake damages. The expected levels of urbanization, family incomes and income structures, output levels of land, and the reliance of agricultural population on arable land were estimated by different regions. With these parameters, the population capacities of the involved townships and cities in three scenarios were estimated. The total population capacity of the entire areas is abundant compared with the actual post-quake population; however, the status of over-population substantially varies across space. It was suggested to put the emphasis of post-quake resettlement policy on those counties where earthquake had been the main causes of over-population. In the Full Recovery Scenario, three mountain counties were identified including Wenchuan, Beichuan and Maoxian, with a total over-population of about 100,000 people.  相似文献   

真鲷（Pagrus major）vasa基因5′端启动子克隆及表达载体构建          下载免费PDF全文

林帆  刘清华  李军  隋娟  肖志忠  徐世宏  马道远  肖永双 《海洋与湖沼》2011,42(2):186-192

采用染色体步移（Genome walking）的方法克隆了真鲷vasa基因5′侧翼序列,采用生物信息学方法分析潜在的顺式作用元件,并与斑马鱼核心启动子进行比对,在此基础上构建了绿色荧光蛋白表达载体。序列分析结果显示：克隆得到的真鲷vasa基因5′侧翼序列序列长度为2762bp,其中包括TATA-box、CAAT-box...  相似文献   

Low-frequency variability of the North Equatorial Current bifurcation in the past 40 years from SODA   总被引：1，自引：1，他引：0  

MENG Qingji  WANG Fan  LIU Na 《海洋学报(英文版)》2011,30(3):14-19

The low-frequency variability of the North Equatorial Current (NEC) bifurcation during 1958 to 2001 was investigated with the Simple Ocean Data Assimilation (SODA) 2.0.2 dataset.In agreement with recent observations,the NEC bifurcation latitude (NBL) shifted northward as depth increases, from about 12.7°N near the surface to about 17.1°N at depths around 500 m for the annual average. This study reveals that the interannual variations of NBL,with five years period,mainly focused on the upper 500 m with amplitude increasing as depth increased.The NBL shifted southward in the past 40 years,which was more significant in the subsurface at more than -0.02°/a.The NBL manifests itself in the transports of NMK (NEC-Mindanao Current (MC)-Kuroshio) system in strong relationship with MC (0.7) and Kuroshio (-0.7).The EOF analysis of meridional velocity off the Philippine coast shows that the first mode,explaining 62% of variance and 5 years period,was highly correlated with the southward shift of NBL with coefficient at about 0.75.The southward shift of NBL consists with the weakening of MC and strengthening of Kuroshio,which exhibited linear trends at -0.24Sv/a and 0.11Sv/a.Both interannual variation and trend of NBL were closely related to the variation of NMK system.  相似文献   

临沂市兰山区城乡建设用地增减挂钩工作探讨     

冯帆  谭晓彤  杜骁  艾文晖  周冉 《山东地质》2011,(5):42-45

城乡建设用地增减挂钩是改善农村生产生活条件和环境,实现城乡统筹,建立城乡统一的土地市场的必然要求。通过对临沂市兰山区的分析,在对＂挂钩政策＂实施中存在的问题分析的基础上,得出＂挂钩政策＂应遵循的基本原则,提出了在挂钩政策下的一条切实可行的操作模式,并依此提出政策建议,为政府决策提供了依据,使其为新农村建设做出更大的贡献。  相似文献   

四川省汶川大地震成因及次生灾害     

宋洪伟  夏凡  龙文华  殷夏 《城市地质》2011,6(2):1-3,17

2008年5月12日14时28分,四川阿坝藏族羌族自治州境内的汶川县（31°N,103．4°E）发生了里氏8．0级浅源地震。震区范围长240km,宽30km,等震线呈长椭圆形,长轴为北东向,震中烈度约为10度,深度为12～19km。震区涉及四川绵阳市北川,德阳、汶川,成都、都江堰、广元、重庆以及甘肃、云南、陕西、河南等地区。除了吉林、黑龙江和新疆地区外,全国都有震感。在北川、汶川等多地区出现次生灾害。地震的发震构造是龙门山构遣带中央断裂带。  相似文献   

世界主要深水含油气盆地烃源岩特征   总被引：2，自引：1，他引：1  

范玉海  屈红军  张功成  冯杨伟  关利群  雷露 《海相油气地质》2011,16(2):27-33

对墨西哥湾、巴西东部大陆边缘、西非被动大陆边缘、澳大利亚西北陆架、挪威中部陆架、南海等六个地区的22个深水含油气盆地烃源岩特征(主力烃源岩形成的时代、构造背景、沉积环境、类型、地球学化指标等)的综合研究结果表明,世界深水含油气盆地主力烃源岩主要集中在白垩系,其次为第三系和侏罗系;裂谷期烃源岩占绝对优势,其次为被动陆缘期...  相似文献   

Accumulation of heavy metals in wild commercial fish from the Baotou Urban Section of the Yellow River,China   总被引：1，自引：0，他引：1  

Changwei Lü  Jiang He  Qingyun Fan  Hongxi Xue 《Environmental Earth Sciences》2011,62(4):679-696

In this work we studied the accumulation of heavy metals in nine species of fish with different life and feeding habitats which are native and major commercial fish in the Baotou Urban Section of the Yellow River. The results showed that the concentration of heavy metals was significantly dependent on fish species; the pollution index of heavy metals in different species were ranked as Hemiculter leucisclus > Carassius auratus auratus > Hemibarbus maculatus > Megalobrama amblycephala > Abbottina rivularis > Cyprinus carpio > Squaliobarbus curriculus > Perccottus glehni > Saurogobio dabryi. Product–moment correlation coefficients among the metal pairs Pb–Zn, Cu–Cd, Cu–Zn, Cu–Pb, Pb–Cd, and Zn–Cd revealed there was no competitions between metals in each tissue. Correlations between heavy metal concentrations and fish length or weight indicated that accumulation of the heavy metals by the different fish species was related to their surrounding environments and their life and feeding habitats. According to the mean bioconcentration factors (BCFs), the heavy metal concentrations in these nine species were ranked Zn ≫ Cu > Cd ≈ Pb. In this work, the bioaccumulation factors (BAFs) were developed by using the sum of exchangeable and bound-to-carbonate heavy metals as Cs values. It was found that BAFs better reveal the accumulation characteristics of the heavy metals in the fish, which might provide an effective method for assessing bioaccumulation of heavy metals.  相似文献   

Optical characterization of CDOM in a marsh-influenced environment in the Changjiang (Yangtze River) Estuary   总被引：1，自引：1，他引：0  

Lei Gao  Daidu Fan  Chengxing Sun  Daoji Li  Jingong Cai 《Environmental Earth Sciences》2011,64(3):643-658

To elucidate the influence of tidal marshes on the amount and chemical structure of chromophoric dissolved organic matter (CDOM) in adjacent coastal waters, surface water samples were collected along three cross-marsh transects in tidal marshes within the Changjiang Estuary. In addition, three sediment cores were collected from the marshes and incubated for 10 h in the laboratory after adding overlying tidal waters. Nutrients, DOC, absorption, fluorescence excitation–emission matrix (EEM) spectroscopy, and other parameters were measured in these samples, which clearly illustrated releases by the tidal marshes of DOC, and CDOM absorbent and fluorescent molecules. To characterize the chemical nature of the marsh-derived CDOM, variations in a suite of optical indices (including molar absorptivity, absorption spectral slope, fluorescence quantum yield, and fluorescence ratios between certain excitation/emission locations) in these samples were plotted against the offshore distance of the stations as well as the incubation time. From the literature, it has been suggested that these variations are closely associated with molecular weight, aromaticity, and humic/fulvic or allochthonous/autochthonous ratios in the CDOM mixtures. This study showed that the CDOM fluorophores changed to more humic-like and were less protein-like from sea to land across the marsh gradients. Furthermore, subtractions between EEM spectra before and after laboratory incubations were applied to illustrate in greater detail the properties of the pure fluorescent compounds exchanged at the sediment–overlying water interface.  相似文献