Degradation of natural resources by environmental pollution     

Yaoqiu Kuang  Dazhong Sun 《中国地理科学(英文版)》1999,9(4):358-367

Compared the total agricultural production (TAP) of the 5 counties in Huizhou City with that of the corresponding 5 counties in Zhaoqing City during the period from 1980 to 1996, it can be seen that the TAP growth rate of the 5 counties in Huizhou City had been a little higher than that of the 5 corresponding counties in Zhaoqing City before 1983, but has been becoming lower than the latter since 1984, and the agricultural production in Huizhou City has been gradually becoming lag behind that in Zhaoqing City since then. The TAP loss in Huizhou City kept above 3×10⁸ yuan every year since 1986. Detailed investigation shows that the acid rain caused by the atmospheric pollution may be the main cause for the lower productivity of the land in Huizhou City. The atmospheric pollution arisen from rapid and extensive development of the economy in the Zhujiang(Pearl) River Delta Region has already greatly reduced the load capacity of the natural resources in Huizhou City and severely affected the sustainable development of the region.  相似文献   

地震观测环境对地震台地震记录的影响及对策   总被引：1，自引：1，他引：0  

王兰兰  张雪玲  何家斌  匡福江 《地震地磁观测与研究》2007,28(4):101-106

分析了地震观测环境对地震台地震记录的影响,论述了地震观测环境对地震台地震记录的重要性.为确保地震台记录的安全可靠,提出了相应的对策.  相似文献   

Study on the phytoplankton · in a large reservoir   总被引：3，自引：0，他引：3  

Xia Yicheng  Kuang Qijun 《中国海洋湖沼学报》1992,10(4):359-370

A comprehensive study on the community structure and function of the phytoplankton in Taipinghu Reservoir, the largest reservoir (9400 ha) in Anhui Province, China, was carried out during 1985–1986. A total of 175 species of algae belonging to 8 phyla and 87 genera was noted. The composition of phytoplankton was dominated by species of Chlorophyta, Cyanophyta and Bacillariophyta. The species number, cell density and biomass of the three groups were respectively 88%, 86.5% and 78.9% of the total phytoplankton. The weighted annual average biomass was 1.52 mg/L and cell density was 1.43×10⁶ ind/L. The growth maximum was observed in summer. Diatoms were abundant in the region adjoining a river. A large number of flagellated algae such asEuglena andChromulina occurred in the artificial fish culture bay. It can be inferred from the algal composition and total nitrogen concentration (1.48 mg/L) that this reservoir is a mesotrophic water body that had undergone slight natural eutrophication. Presented are an equation for the relation between cell density and biomass of algae and a newly developed method based on the energy flow principle in ecology for theoretically estimating algal fishery potential. The algae volumes of 128 species were measured for calculating the biomass.  相似文献   

环境污染对自然资源的破坏──从惠州与肇庆农业增长的对比看大气污染造成的经济损失   总被引：1，自引：0，他引：1  

匡耀求  孙大中 《地球化学》1998,(4)

惠州市与肇庆市的相应5县（区）1980—1996年农业总产值对比表明,1983年以前惠州市5县（区）农业总产值和增长速度均略高于肇庆市的相应5县（区）,但自1983年以后惠州市开始落后巨差距逐步拉大,至1987年以后农业总产值的差距达每年3亿元以上。深入分析表明,大气环境污染造成的酸雨可能是导致惠州市土地生产力降低的主要原因。伴随珠江三角洲经济高速发展产生的大气环境污染已经使惠州市自然资源的承载力大为降低,严重影响到这一区域的可持续发展,火电厂的脱硫除硝装置必须尽快安装,珠、港、澳地区跨界污染控制及其补偿与大气环境容量的区际分配必须提上议事日程。  相似文献   

基于资源承载力的区域可持续发展评价模式探讨 --对珠江三角洲经济区可持续发展的初步评价   总被引：15，自引：3，他引：12  

匡耀求  孙大中 《热带地理》1998,18(3):249-255

讨论区域可持续发展评价的现状,将资源的概念广义化,把资源划分成为自然资源,经济资源和社会资源三类,将自然,社会,经济三个子系统的作用量化为三类资源的人口承载能力,一个地区各类资源承载能力之和与当年实际人口数量之比可以作为区域可持续发展年度评价指标,根据１９９６年统计数据,应用这一模式对珠江三角经济区９个城市评价的结果,表明其仍处在可持续发展轨道上,它们的可持续发展能力大小依次是;广州,惠州,肇庆,  相似文献   

电偶源频率电磁测深中的EX分量   总被引：1，自引：1，他引：0  

陈明生  阎述 《煤田地质与勘探》1998,26(6):60-66

在电偶源频率电磁测深的各场量中,电场ＥＸ分量具有分辨率同,观测信噪比高,不需作近场改正等优点。在有地表电性不均匀引起的静态偏移情况下,可通过转换相位消除静态偏移。因此在资料处理与解释中可不局限于比值电阻率的模式,使频率电磁测深具有更大的灵活性与适应性。  相似文献   

Diagnostic study of the summer thermocline depth in the Huanghai Sea and the East China Sea     

Yang Dianrong  Kuang Guorui  Zhang Yulin  Zhou Dejian 《海洋学报(英文版)》1990,9(3):331-342

- In this paper, the depth of the summer thermocline of the South Huanghai Sea and the East China Sea is calculated with two kinds of one-dimentional models, and the formation reasons are explained for the summer thermocline depth distribution characteristics in the study area. It is proved that in the shelf area of the East China Sea, tidal mixing has an important impact on the thermocline depth. And a new explanation for certain phenomena of the so-called coastal upwelling in the East China Sea is proposed.  相似文献   

Effects of hexavalent chromium on early development of the bay scallop Argopecten irradians Lamarck     

Kuang Shihuan  Zhang Fusui 《海洋学报(英文版)》1996,15(2):273-282

ＥｆｆｅｃｔｓｏｆｈｅｘａｖａｌｅｎｔｃｈｒｏｍｉｕｍｏｎｅａｒｌｙｄｅｖｅｌｏｐｍｅｎｔｏｆｔｈｅｂａｙｓｃａｌｌｏｐＡｒｇｏｐｅｃｔｅｎｉｒｒａｄｉａｎｓＬａｍａｒｃｋＩＮＴＲＯＤＵＣＴＩＯＮＣｈｒｏｍｉｕｍｉｓｗｉｄｅｌｙｕｓｅｄｉｎｔｈｅｉｎ...  相似文献   

Optical and radiative properties of aerosols during a severe haze episode over the North China Plain in December 2016     

Yu Zheng  Huizheng Che  Leiku Yang  Jing Chen  Yaqiang Wang  Xiangao Xia  Hujia Zhao  Hong Wang  Deying Wang  Ke Gui  Linchang An  Tianze Sun  Jie Yu  Xiang Kuang  Xin Li  Enwei Sun  Dapeng Zhao  Dongsen Yang  Zengyuan Guo  Tianliang Zhao  Xiaoye Zhang 《Acta Meteorologica Sinica》2017,31(6):1045-1061

The optical and radiative properties of aerosols during a severe haze episode from 15 to 22 December 2016 over Beijing, Shijiazhuang, and Jiaozuo in the North China Plain were analyzed based on the ground-based and satellite data, meteorological observations, and atmospheric environmental monitoring data. The aerosol optical depth at 500 nm was < 0.30 and increased to > 1.4 as the haze pollution developed. The Ångström exponent was > 0.80 for most of the study period. The daily single-scattering albedo was > 0.85 over all of the North China Plain on the most polluted days and was > 0.97 on some particular days. The volumes of fine and coarse mode particles during the haze event were approximately 0.05–0.21 and 0.01–0.43 μm³, respectively—that is, larger than those in the time without haze. The daily absorption aerosol optical depth was about 0.01–0.11 in Beijing, 0.01–0.13 in Shijiazhuang, and 0.01–0.04 in Jiaozuo, and the average absorption Ångström exponent varied between 0.6 and 2.0. The aerosol radiative forcing at the bottom of the atmosphere varied from –23 to –227,–34 to –199, and –29 to –191 W m^–2 for the whole haze period, while the aerosol radiative forcing at the top of the atmosphere varied from –4 to –98, –10 to –51, and –21 to –143 W m^–2 in Beijing, Shijiazhuang, and Jiaozuo, respectively. Satellite observations showed that smoke, polluted dust, and polluted continental components of aerosols may aggravate air pollution during haze episodes. The analysis of the potential source contribution function and concentration-weighted trajectory showed that the contribution from local emissions and pollutants transport from upstream areas were 190–450 and 100–410 μg m^–3, respectively.  相似文献   

The Importance of Computational Grids in Hydraulic Numerical Models     

Kuang Cuiping Ph. Doctor  Senior Engineer  River  Harbour Engineering Department  Nanjing Hydraulic Research Institute  Nanjing 《中国海洋工程》1997,(3)

The importance of computational grids in hydraulic numerical models is studied by numericalsimulation of jet flow in a rectangular duct which is linked with a fixed width inlet and a different widthoutlet using a standard k-ε turbulence model.The computational results show the numerical solutionsmay not be reasonable because of the incorrect computational grid and each numerical model has a grid-in-dependent solution.The computational grid has a definitive effect on the accuracy and stability of thecomputational solution,which must be divided well according to the simulated geometry and physicalcharacters of hydraulic problems.The main guidelines about the formation of computational grid in suchaspects as node distribution,smoothness and skewness of grid,have been given.  相似文献