SOIL EROSION AND ITS IMPACTS ON ENVIRONMENT IN YIXING TEA PLANTATION OF JIANGSU PROVINCE

Soil erosion on sloping field has led to a lot of environmental problems. In order to reveal the seriousnessof the damage of soil erosion on sloping fields 137^Cs tracer method was used to estimate soil erosion rate. 137^Cs referenceinventory of 2200Bq/m^2 in Yixing, southern Jiangsu Province, was estimated and a model for estimating erosion of cultivat-od soil was established in order to avoid overestimating soil erosion rates. Then based on the soil erosion rates and mea-sured soil physical and chemical properties, direct and indirect impacts of soil erosion on environment were further dis-cussed. Direct impacts of erosion on environment included on-site and off-site impacts. The on-site impacts were thatsoil layer became thin, soil structure was deteriorated and soil nutrients decreased. The off-site impacts were that waterbodies were polluted. The indirect impacts of soil erosion on environment were the increase of fertilizer application andenergy consumption, and change of adaptability of land uses. Although erosion intensity was not serious in the studyarea, its environmental impacts should not be ignored because of great soil nutrient loss and coazseness of soil particles.     

构建机制抓工程 节约集约促转型——江苏省宜兴市大力推进节约集约用地的经验

宜兴是一座山清水秀的生态宜居城市,境内有“三山两水五分田”,生态禀赋得天独厚,山在城中、城在水中的特色非常鲜明,自古就有“阳羡山水甲江南”的美誉,素有“陶的古都,洞的世界,茶的绿洲,竹的海洋”之称,是中国优秀旅游城市、国家卫生城市、国家环保模范城市、全国生态示范区、国家生态市。宜兴又是一座文脉厚重的历史文化名城。7000多年的制陶史、2200多年的建城史,孕育了宜兴特殊的地域文化现象,是全国著名的“教授之乡”、“书画之乡”,被国务院列为国家历史文化名城。     

江苏宜兴市地质资源环境承载能力评价

当前资源环境承载能力的研究多针对区域尺度,县域尺度地质资源环境承载能力评价较少。以江苏宜兴市为例,基于承载本底和承载状态建立了评价指标体系,并从地质资源、水土环境和地质安全3个方面,开展了地质资源环境承载能力评价,为县市地质资源环境承载能力评价技术要求制定提供了支撑和参考。评价结果显示,宜兴南部丘陵山区地质资源承载能力大于北部平原区,地质安全承载能力则小于北部平原区,水土地质环境承载能力总体为中等水平,提出宜兴市应加强南部山区资源环境保护与地质灾害防范,中部地区水土污染重点防控,为宜兴市地质资源合理利用与地质环境安全保障提供科学依据。     

"发蛟"灾害的成因及防范

“发蛟”是江苏宜兴市湖Fu镇，张渚等地植被覆盖良好的低山区发生的一种局地性泥石流灾害。作者通过对湖Fu镇一处发蛟地的调研，从黄石山区的地表组成，气候条件和地形因素三个方面分析了“发蛟”的形成原因，并提出了具体的防范措施。     

机载成像光谱数据预处理方法研究--以江苏宜兴市为例

该文基于土地利用／土地覆盖分类目的,对国产128波段的宜兴市机载成像光谱数据进行了数据导入、镜像变换、辐射畸变纠正、相对反射率转换和几何精纠正以及多航带间的镶嵌试验研究。通过分析发现：经验线性法定标效果明显好于其他两种定标方法;图像精纠正后多条带镶嵌图能够与土地利用现状数据库较好吻合。     

基于GIS的江苏宜兴市地质灾害易发区评价

宜兴市地质环境条件复杂,人类工程活动强烈,地质灾害发育、危害严重。本文通过对宜兴市地质灾害发育现状、形成条件及影响因素分析,选取了评价因子,在网格剖分的基础上,采用加权指数模型,分别计算出每个单元的滑坡和崩塌、岩溶地面塌陷、采空地面塌陷的易发程度指数,然后利用MapGIS的空间分析功能进行叠加,得到宜兴市的地质灾害易发程度综合指数分区图,划分出地质灾害高、中、低和不易发区,为科学地开展地质灾害防治提供了依据。