Yixing City Research Articles

Study on Measurement of Level of Economic–Environmental System's Coordination Development in Yixing City

Abstract The quantitative measure to the coordination of the development of the regional economy and environment is important to the scientific evaluation to the level of development of the regional economy and environment, and the current research to the quantitative measure to the coordination of the development of the regional economy and environment is still rarely paid a attention. For the shortcomings of existing research, the index system of the quantitative measure to the coordination of the development of the regional economy and environment is established firstly, and then the model to measure the coordination of the development of the regional economy and environment is also established by the principal component analysis and the deviation, and fin ally the model is made use of the measure to the coordination of the development of the regional economy and environment in City Yixing for the period of 2004-2009.the results show that during the period of 2004-2007, the level of coordination of the development of the City Yixing's economy and environment is good,but for the period 2007-2009,the level was downward trend.

Japanese and Chinese firms aim to improve wastewater treatment in rural areas

Teijin Ltd has signed a business collaboration agreement with Yixing City Water Works & Construction Investment Co Ltd, which manages water supply and sewage systems for the city of Yixing, Jiangsu Province, China, to co-develop wastewater treatment systems for rural communities.

An approach to partition the anthropogenic and natural components of heavy metal accumulations in roadside agricultural soil

This paper describes a new approach that allows us to partition the anthropogenic and natural contributions to heavy metal accumulations in roadside agricultural soils. This approach, combining trend analysis and multivariate statistical analysis, partitions total heavy metals into three components: anthropogenic, natural, and unexplained residual. The approach was applied in a case study in Yixing City, China, to determine the spatial distributions of heavy metal accumulations. The results show that anthropogenic components of Pb, Cu, Zn, and Cd account for 52.4%, 23.04%, 5.09%, and 10.9% of total content, respectively. Spatial distributions of anthropogenic components are characterized by decreasing accumulation with increasing distance from the road. Ranges of influence of traffic for Pb, Cu, and Cd are beyond 300m, whereas the range of Zn is less than 200m. The spatial distributions of the four elements' natural components show relatively similar distribution patterns. Assessments of variable partition methods show that the predicted values of Pb, Cu, Zn, and Cd are consistent with their measured values. The anthropogenic components extracted from total contents of heavy metal will be useful for modeling heavy metal accumulations produced by human activities.

Heavy metals contents in soil profiles of typical agricultural lands in Yixing, Jiangsu Province, China

The effect of land use pattern on the heavy metals (HMs) distribution in soil profiles was investigated in Yixing City, China, for the four typical types of land utilization, i.e. vegetable fields on the plain, paddy fields, tea gardens on hilly lands and bamboo groves. The variance of HMs concentration in the depth of 0–15 cm, 15–30 cm, 30–60 cm of soil profiles was compared among the different tillage ages. Results showed there was a notable accumulation of Cd, Hg, Cu, Pb, Zn and Cr in the soil profiles of vegetable fields and paddy fields causing a pollution of Cu, Hg and Cd in some profiles, while no remarkable accumulation of HMs in the soil profiles of the tea gardens and bamboo groves was found. The accumulation extent of HMs in the soil profiles of the four kinds of land use followed a sequence of vegetable fields>paddy fields>tea gardens>bamboo groves. The accumulation of HMs was mainly due to the industry, transportation, other urban human activities, and intensive use of fertilizers and pesticides. The downward leaching of HMs was relatively remarkable in the soil profiles of vegetable fields. There was an accumulation in surface and subsurface layers for Cd, Hg, Pb, Zn in the soil profiles of paddy fields and tea gardens, and for Cd, Hg in those of bamboo groves. Serious pollution effects of Hg, Pb, and Zn have been shown in the soil of vegetable fields. All the four kinds of agricultural land are basically free from the pollution of the external sources of As and Ni. With the increase of tillage time, the soil of vegetable and paddy fields will face the potential risk of HMs pollution, which mainly comes from Hg, Cd and Cu, whereas that of tea gardens and bamboo groves faces a relatively small risk.

Spatial distribution and sources of soil heavy metals in the outskirts of Yixing City, Jiangsu Province, China

City outskirts serve as the concentration centers for the pollutants discharged from various sources such as industry, agriculture and transportation. With the acceleration of industrialization and urbanization, the eco-environment of the city outskirts has become a hot spot of public concern. An analysis was conducted in this paper on the soil in the outskirts of Yixing City using frequency distribution functions. The heavy metal sources in this region had been divided into two components, i.e. natural background component and strong human disturbance component. The corresponding interpretation of the distribution pattern and features of heavy metal elements was presented by spatial analysis. The results showed that the strong human disturbance components of Hg, Pb, and Cu accounted for 36.9%, 26.7%, and 23.3% in their contents respectively, which indicated directly the serious effect of human activities on heavy metal contents. Hg and Pb, because of the human disturbance, showed the greatest spatial variability, and human activities intensified the heterogeneity of the spatial distribution. The anisotropic analysis showed the higher organisation of Hg and Zn in the direction of urban-rural transition, which indicated their spatial characteristics with urban-rural transition. Pb displayed distinctive structure in the vertical direction of urban-rural transition, which was largely controlled by highway distribution. Cu content in paddy fields was significantly higher than those of other land-use-types, and the agricultural non-point source pollution played an important role in the distribution pattern of Cu.

Water quantity exchanges between typical river network area and western Lake Taihu

The study focused on the water quantity exchanges between the typical river network area (at Dapu Town,Yixing City) and the western Lake Taihu.Effect of rainfall taken into consideration,the runoff formation and flow concentration model considering various underlying surfaces was adopted to simulate the runoff process, both of the typical river network area and the nearby western hill area(2002 (base year),1998(wet year),1995 (normal year) and 1994(dry year) respectively).Then the non-steady state river network water quantity model was established by adapting to the typical river network area.Combined with the results of the runoff formation and flow concentration simulation,the water quantity model was applied to simulate the dynamic changes of water flow in the typical river network area,for each year mentioned respectively.Finally,water quantity exchanges between the typical river network area and the western Lake Taihu was ascertained.Changes of the water quantity exchanges in the year and between the years was also studied,on both co-current and adveme current conditions.

An illustrative study on local landscape and its long-term changes based on IKONOS and historical aerial photo

Nowadays, the research works on landscape at fine scales using high-resolution images are uncommon. This research is based on the analysis of the combination of remote sensing data (IKONOS imagery acquired in 2002 and historical aerial photo taken in 1942). In the paper, the ecotopes in Qiujiadou and Xishao villages in Yixing City of Jiangsu Province in 1942 and 2002 were compared and landscape changes as well as the causes of the considerable changes were analyzed. It was found that the ecotope changes were at greater level in some aspects such as water surface and perennial vegetation coverage etc. This study at fine scale is globally significant for the rural areas, especially for the subsistence agricultural land, which occupies larger percentage in the earth. And it analyzes the structure of landscape based on a new landscape classification system—stratifications method.