不同类型社区绿地规模和结构对居民心理健康的影响——以上海市郊区为例     

李红  塔娜 《热带地理》2022,42(12):2031-2041

以上海市郊区为案例地区,综合问卷调查和多源绿地数据,构建有序Logit模型分析高档、低档、近郊、远郊4类社区的社区内外绿地规模与结构对居民心理健康的影响。结果发现：1）不同社区的绿地数量与结构存在显著差异。高低档社区内的绿地差异大于近远郊社区;近郊社区的周边绿地数量优于远郊社区,但公园绿地可达性更差。2）提高社区内乔木和灌木比例、增加社区周边公园绿地可达性对心理健康有正向影响。3）低档社区居民的心理健康受到社区内植被覆盖和公园绿地可达性的显著影响,而高档社区居民对绿地空间的作用不敏感。4）近郊社区居民受到周边绿地规模和社区内植被覆盖的影响,而远郊社区绿地率和公园绿地的可达性对居民心理健康有显著作用。最后,提出对于低档和近郊社区首先需要关注社区内的绿地规划,对于高档和远郊社区应注重社区内外的绿地平衡的建议。  相似文献   

Evaluating the anthropogenic and geologic impacts on water quality of the Eğirdir Lake, Turkey     

Şehnaz Şener  Ayşen Davraz  Remzi Karagüzel 《Environmental Earth Sciences》2013,70(6):2527-2544

E?irdir Lake is the second largest fresh water lake with 482 km² surface area of Turkey. The lake is an indispensable water source for our country and region because of available water capacity and usage aims such as drinking-irrigation water, tourism, and fishing. However, especially contaminants located in the E?irdir Lake catchment affect the lake water quality negatively in times. Therefore, determination of the water quality of the lake has quite importance for region human health and sustainable usage of the lake. The major factors that control the quality of the E?irdir Lake water are agricultural activities in the basin, water–rock interaction, and domestic and industrial wastes. This study investigates the anthropogenic and geologic impact originated from pollution sources and water–rock interaction in the lake watershed basin to the E?irdir Lake water quality. For this purpose, geological, hydrogeological, and hydrological properties of the lake basin with point and nonpoint pollution sources were investigated. To determine the water quality of the lake, 48 water samples were collected especially from locations representing effects of pollutants in May and October 2009. The analysis results were compared with maximum permissible limit values recommended by World Health Organization and Turkish drinking water standards. The contents of all chemical and physical parameters are higher in dry periods than wet period, and water pollution was observed at discharge points of the streams into the lake. Also, pH, turbidity, potassium, chemical oxygen demand, ammonium, aluminum, iron, and lead concentrations were found to be above drinking water standards.  相似文献   

Planform channel dynamics along the Ningxia–Inner Mongolia reaches of the Yellow River from 1958 to 2008: analysis using Landsat images and topographic maps     

Zhengyi Yao  Jianhua Xiao  Wanquan Ta  Xiaopeng Jia 《Environmental Earth Sciences》2013,70(1):97-106

Channel planform dynamics were analyzed for the Ningxia–Inner Mongolia reaches of the Yellow River. Map data were analyzed by means of GIS and used to determine the planform characteristics and changes in width, sinuosity, and shoreline migration rates between 1958 and 2008. The study was based on topographic maps of 1958 and 1967, which had been derived from aerial photos and a field survey and from satellite imagery of 1977, 1990, 2000, and 2008. The channel planform dynamics were determined by comparing sequential changes in the position of the shorelines in these years. Sinuosity adjustments were small during the study (range: 1.34–1.45). The initial sinuosity (1.45 in 1958) gradually decreased to 1.34 in 1990, and then increased to 1.40 in 2008. Channel contraction had been the dominant planform process, but periodic floods resulted in channel expansion (1958–1990). The river’s channel area expanded substantially from 1958 to 1990 (by 42.1 %), then sharply contracted from 1990 to 2000 (by 45.8 %), with no subsequent changes. The bank erosion and accretion rates were severe. The mean erosion rates ranged from 30.7 to 68.3 m/year on the left side and 27.1 to 58.3 m/year on the right side. The mean accretion rates ranged from 44.4 to 68.3 m/year on the left side and 30.5 to 60.4 m/year on the right side. The mean channel midline shifted by 57.8 m toward the right from 1958 to 2008. The mean channel midline moved 4.8 m to right from 1958 to 1967, 54.3 m to the left from 1967 to 1977, 44.2 m to the right from 1977 to 1990, 64.3 m to the right from 1990 to 2000, and 2.8 m to the right from 2000 to 2008.  相似文献   

Geoheritage values in the Cat Ba islands, Vietnam     

Ta Hoa Phuong  Nguyen Huu Cu  Tran Duc Thanh  Bui Van Dong 《Environmental Earth Sciences》2013,70(2):543-548

Geological wonders have been generally known as natural wonderful products. Resulted from geological processes, geological wonders are diverse in size that have geoheritage values that should be protected from damaging of substance, form and natural development. In a large scale, geological wonders can be geoheritage areas, containing several geodiversity elements that are geologically important or in a smaller scale, they can be geosites of heritage values (or geoheritage sites). In the delimitation of areas, having geoheritage values and the establishment of geoparks, the first thing is to recognise them as geosites and geoheritage areas that indicate great geological values. Besides the Ha Long bay, the world natural heritage with its outstanding aesthetic and geological values, the Cat Ba islands are typical and grandeur karst landscapes formed in tropical condition. Based on the geodiversity elements with their own geoheritage values on aesthetics, uniqueness and grandeur in the Cat Ba islands, the authors have recognised three geoheritage areas: the south cape of the Cat Ba embayment, Tung Gau (shelter), and the Lan Ha bay. Sites where Brachiopods, Crinoids and Tetracorals are exposed on the way through the island are considered as palaeontological geosites. The folds of limestone layers in the northern part of Cat Co 3 beach, with typical turbidite structures in carbonate formations are considered as a lithological geosite. The Devonian-Carboniferous boundary near the Cat Co 3 beach is regarded as a stratigraphical geosite while Que Kem and Turtle islands, etc. are considered as geomorphological geosites.  相似文献   

Fluid inclusion and sulfur isotope thermometry of the Inkaya (Simav-Kütahya) Cu-Pb-Zn-(Ag) mineralization, NW TURKEY     

Yeşim Özen  Fetullah Arik 《Central European Journal of Geosciences》2013,5(3):435-449

The Inkaya Cu-Pb-Zn-(Ag) mineralization, located about 20 km west of the Simav (Kütahya-Turkey), is situated in the northern part of the Menderes Massif Metamorphics. The mineralization is located along an E-W trending fault in the Cambrian Simav metamorphics consisting of quartz-muscovite schist, quartz-biotite schist, muscovite schist, biotite schist and the Ar?kayas? formation composed of marbles. Mineralized veins are 30–35 cm in width. The primary mineralization is represented by abundant galena, sphalerite, chalcopyrite, pyrite, fahlore and minor amounts of cerussite, anglesite, digenite, enargite, chalcocite, covellite, bornite, limonite, hematite and goethite with gangue quartz. Fluid inclusion studies on the quartz samples collected from the mineralized veins indicate that the temperature range of the fluids is 235°C to 340°C and the salinities are 0.7 to 4.49 wt. % NaCl equivalent. The wide range of homogenization temperatures indicates that two different fluid generations were trapped in quartz. Sulfur isotope studies of the sulfide minerals showed that all of the δ ³⁴S values are between ?2.1 and 2.6 per mil. These values are a typical range for hydrothermal sulfide minerals that have sulfur derived from a magmatic source. Pyrite-galena and pyrite-chalcopyrite sulfur isotope fractionation is consistent with an approach to isotopic equilibrium, and calculated temperatures are 254.6 and 277.4°C for pyrite-galena and 274.7°C for pyrite-chalcopyrite. The microthermometric data and sulfur isotope thermometry indicate the existence of a hydrothermal fluid that circulated along the fault crossing the Simav metamorphics and Ar?kayas? formation. Fluid inclusion and sulfur isotope thermometry can be used in combination with ore petrographical and geological information to provide site-specific targets for meso-hypothermal metal concentrations.  相似文献   

Biperiodic orbital period modulation of the W UMa binary system CK Bootis     

Alexandru Pop  Călin Vamoş 《New Astronomy》2012,17(7):667-672

A study of the orbital period variation of the W UMa system CK Bootis is made using an extended observational time base. The biperiodicity of the orbital period modulation is emphasized. Both detected periodicities (24.14 yr and 10.62 yr) cannot be explained through the light-time effect unless the companion would be a white dwarf as suggested by other authors, too. Moreover, we also argue that, nowadays at least, it seems that there is no causal relation between the orbital period variation and the recently discovered visual companion. Consequently, we infer that at least one of the two periodicities may be related to the magnetic activity cycles in the component stars of CK Boo, while the other periodicity could be related to the presence of a fourth companion in the system.  相似文献   

Multiple linear regression,multi-layer perceptron network and adaptive neuro-fuzzy inference system for forecasting precipitation based on large-scale climate signals     

Bahram Choubin  Shahram Khalighi-Sigaroodi  Özgür Kişi 《水文科学杂志》2013,58(6):1001-1009

ABSTRACT

Nowadays, mathematical models are widely used to predict climate processes, but little has been done to compare the models. In this study, multiple linear regression (MLR), multi-layer perceptron (MLP) network and adaptive neuro-fuzzy inference system (ANFIS) models were compared for precipitation forecasting. The large-scale climate signals were considered as inputs to the applied models. After selecting the most effective climate indices, the effects of large-scale climate signals on the seasonal standardized precipitation index (SPI) of the Maharlu-Bakhtaran catchment, Iran, simultaneously and with a delay, was analysed using a cross-correlation function. Hence, the SPI time series was forecasted up to four time intervals using MLR, MLP and ANFIS. The results showed that most of the indices were significant with SPI of different lag times. Comparison of the SPI forecast results by MLR, MLP and ANFIS models showed better performance for the MLP network than the other two models (RMSE = 0.86, MAE = 0.74 for the first step ahead of SPI forecasting).