以长江三峡巫山第四纪沉积物为主要研究对象,目的在于弄清它究竟是风化壳还是北方黄土在此区的沉积.利用马尔文激光粒度仪对其粒度进行了检测,并计算了粒度参数,结果表明:(1)砂含量极少,平均值为0.7%,粉砂最高,为68.64%,黏粒次之,为30.66%;风尘基本粒组10～50 μm含量较高,平均值为52.07%,推测其成因有一定的风成特性.(2)剖面粒度分布曲线呈单峰形态,拖有细尾,与风成黄土类似,可能指示沉积后经历了风化成壤作用.(3)望天坪剖面粒度参数特征与北方风成黄土具一定相似性,判别参数分析对应于风成

采用实地调查和实践研究相结合的方法,了解惠州红树林湿地历史变迁和现状,探讨红树林湿地资源对地方经济、生态、环境、景观美学等方面的功能价值,找出惠州红树林湿地遭受破坏的原因以及红树林湿地恢复过程中存在的问题;认为应通过建立红树林自然保护区、加强红树林的管护等方法,恢复和改善红树林湿地资源,使红树林湿地资源得到有效的保护和持续的发展

新丰江是广东最重要的饮用水源之一,事关香港等地区的饮用水安全供应.结合实地调查,以新丰江水库饮用水源地为对象,将水资源管理、水权制度、补偿机制和生态经济等作为一个复杂系统来综合研究.结果显示,目前新丰江水库面临着较大的水资源生态环境压力,经济发展限于水源保护而受到巨大制约,迫切需要启动生态补偿机制.针对新丰江水库饮用水源地面临水资源需求缺乏合理配置和有效管理,补偿方式单一、标准偏低等主要问题,提出了水源地生态补偿机制,通过建立优质水权市场,健全水源地监督管理机制和依靠科技进步创新水源地的可持续发展模式.

以"精明增长"是否适用于中国的城市规划管理为基本出发点,在理清"精明增长"概念的基础上,分析中国与美国城市发展差异,探讨"精明增长"理念对我国城市规划管理的启示.介绍了"精明增长"产生的背景及内涵,阐述了美国"精明增长"发展计划的实践并对此作出评价.基于中美差异的思考对"精明增长"在我国的应用意义和可行性进行了论述,结合中国国情思考其对我国城市规划管理的启示,提出了从理论实践和技术手法上用"精明增长"的理念来为科学合理的城市规划管理进行理念更新的建议.

分析了昆明市区旱季道路尘土样品磁化率特征.结果表明,样品的XlL的变化范围为96×10-8>～9×10-8>m3>/kg,平均值为46.5×10-8>m3>/kg,Xfd值变幅为0.3%～13.8%,平均为2.0%;磁化率数值由市中心区向郊区呈下降趋势,且城市不同功能区的磁化率值也存在明显差异,表明影响昆明市街道尘土磁化率因素的多元性,工业活动可能不是昆明市城区道路尘土磁性矿物颗粒最主要来源,而主要是来自市区日常生产与生活活动,特别是昆明市众多机动车辆产生的磁性颗粒物;道路尘土中磁性矿物含量较高,以人为源

通过对日本农业与农村的实地考察与研究,结合我国生态农业发展实际,首次介绍了日本从2005年开始出现的MIDORI生态农业模式--水土宜居家园,阐述其产生的背景、内涵及特征.这一生态农业模式的特点与启示是:科学的国土资源保护、水土资源精细利用、有效的城乡互动和生态观光农业发展.我国华南沿海地区在自然地理上与之相近,经济也较发达,可以借鉴日本MIDORI成功经验,发展生态农业,加快传统农业向现代农业过渡与社会主义新农村建设.

为制定人体红细胞计数参考值的统一标准提供科学依据,以健康老年女性为例,收集了30 865例健康老年女性的红细胞计数参考值,用5层BP神经网络分析了地理环境的海拔高度、年日照时数、年日照百分率、年平均气温、气温年较差、年平均相对湿度、年降水量和年平均风速等要素对其的影响,通过不同的地理环境变量组合,以训练误差为标准,评估不同地理变量对其的影响.结果表明:海拔高度、气温、湿度和风速对红细胞计数参考值的影响比较显著.认为临床诊断中需要考虑长期在不同海拔高度、气温、湿度和风速环境条件下生活的人群红细胞计数参考值的

围绕广东"双转移"战略背景下欠发达山区面临的产业转移与劳动力转移两大发展命题,采取实证研究方法,以兴宁市为例,探讨"双转移"战略背景下欠发达山区发展战略选择.认为产业和劳动力双转移对欠发达山区产业发展与主导产业选择、劳动力本地与异地转移产生影响,选择绿色工业发展生态经济、发展素质教育与技能教育提高人口劳动力素质是"双转移"战略背景下欠发达山区发展战略选择.

以剖析环水东湾新城过去发展不理想为起点,分析近年及将来外部环境的变化,提出环水东湾新城发展的新机遇.同时结合环水东湾地区的资源特色和茂名城市发展的新要求,提出环水东湾新城的发展策略.认为:①解决环水东湾新城较长时期发展动力不足问题,需要通过产业先行,激活活力;强化地域特色,营造新城魅力和更优的宜居环境:形成旅游开发与城市开发互动格局.②成就服务新城的成长,需要周边地区产业发展的支持,尤其北部旧城区部分人口与服务设施的南迁和博贺-北山港及临港产业的开发.③增强新城的可进入性,需要梳理茂名三大板块之间、新城与

采用恩格尔系数法界定广州城市中等收入群体的产生、发展,利用统计方法计算出各年份广州城市中等收入群体的具体收入区间,进而深入分析广州城市中等收入群体的住房困境,并借鉴国外经验,将中等偏下收入群体纳入住房保障范围,实行税收优惠政策、控制规划与土地出让确保普通商品住房为市场供应主体,完善限价房制度,政府加大中等收入群体聚居区配套支出,限制高收入群体和外国人士投机、改革公积金制度、发展合作建房等方面提出解决城市中等收入群体住房问题的策略.

以南京为研究对象,通过对35个创意产业集聚区窄间分布特征的分析,认为南京创意产业集聚区以改造产业类历史空间、依托创新源和沿景观资源等三种空间发展模式为主,创意产业集聚区的发展不仅加快了城市空间结构优化,而且通过城市空间景观塑造、城市历史环境重生和传统产业空间置换发挥着积极的空间效应.

运用地理学的资源评价法和区域比较分析法,分析了我国已有风景区中最典型最有代表性的资新盆地丹霞地貌景观特征,并与我国其它著名丹霞地貌景观进行了对比和景观质量评价,指出资新盆地丹霞地貌景区具备申报世界地质公园的诸多有利条件和基础,广西资源县与湖南新宁县应该联合起来协调申报.

借助地理计量分析方法,以海南岛A级景区、国家森林公园等41家旅游景区(点)为研究对象,通过最邻近指数与地理集中指数、不同等级类型景区(点)在各行政区内分布的比较,以及景区(点)在东、中、西三大区域的分布差异,分析了海南岛高等级旅游吸引物的空间结构特征及其演化阶段和模式.结果表明:海南岛高等级景区(点)整体分布较均匀,但在伞岛18个市县中的分布呈现一定的集中性,以三亚、海口、琼海和万宁4个聚集区为基础形成了东部旅游带,且优势明显;高等级旅游吸引物数量众多,以自然景观类为主,但相似程度较高,资源多样性没有得到

当代地理学面临自然-人文二元化、学科过分分化、失去雄心壮志且健忘等问题,统一地理学受到挑战.从自然地理学先驱们探讨人类活动及其影响着手,对自然地理学的人文化进行回顾,并论述其最新进展;从自然生产视角探讨人文地理学与自然地理学的交叉性.基于两大分支学科的最新发展趋势和解决问题的面向性,提出围绕重大问题,超越自然,人文二元化,加强对话,加强统一地理学,以便加强学科认同并对人类面临的重大问题做出应有的贡献.

以中国期刊全文数据库(清华同方)的相关检索文献作为研究数据源,运用EXCEL软件和文献计量方法统计分析1994年以来该数据库收录的论文,并根据研究内容需要进行人为筛选分类,分析研究我国耕地数量、质量和空间变化的进展情况.结果表明:我国耕地变化研究经历了早期调查、动态监测以及土地利用和耕地变化综合研究三个发展阶段,目前研究还存在综合性与系统性不够、缺少定量指标和综合模型、研究尺度不全面、专业化研究不够和服务目标不全面等方面的问题.鉴于此,认为从多尺度构建具有空间、动态性的综合模型是今后耕地变化研究的重点.

选取海南岛东寨港、三亚河和青梅港红树林自然保护区为研究对象,在1959年和2008年的数据基础上,分析了近50年海南岛红树林种类、群落和面积的变化与环境之间的关系.在50年内,三地的红树植物相对灭绝种类比例小,只有三亚河种类变化较大,从26种减少为20种(另有2个引入种),东寨港和青梅港则分别仪减少1种.从群落类型面积变化分析可知,50年来三地主要群落的损失率均在41%以上,所毁灭的群落以近岸的内缘种为优势的群落为主,主要是海莲,尖瓣海莲,木榄群落和角果木群落等,并存在单优种群落向多种混合的多优种群落的演

在阐述滨水区综合价值基础上,通过调研和实例分析等方法,提出我国城市滨水区的存在问题;以整体观照的方法,将个案研究纳入宏观研究的范畴,研究总结了我国滨水区建设的历程和阶段特点;结合近年滨水区再开发的典型案例进行分析、综合、比较、归纳,提出了滨水区再开发的几种思路,并结合实例阐述了滨水区综合再开发的几个侧重点,在审思前阶段滨水区开发建设成果的同时,阐述了滨水区未来再开发的发展趋势.

针对广州河涌治理出现的问题,从地理学角度进行分析,结合近百年来广州水患己从防洪为主,转变为以治理水质为第一要务,提出应打通过去因防洪而堵塞的河涌,从上游引入外江水,增加径流量,改善水质;方法上应充分应用系统工程理论,做好此项复杂庞大的工程.

通过构建投影指标函数和采用遗传算法对投影方向进行优化,建立了基于投影寻踪法的水库富营养化评价模型,并应用于深圳市铁岗水库与石岩水库的富营养化评价.研究结果表明,铁岗水库的营养状态值为50.4～54.7,石岩水库为53.4～57.6,峰值出现在夏秋季,2个水库均达到轻度富营养化水平,石岩水库的富营养化程度相对较高.投影寻踪法的评价结果与线性插值评分法相近,但反映了不同评价指标对营养状态的贡献差异,更为科学合理,值得推广应用.

利用汕尾站、广州站和阳江站1953-2008年56 a的逐月降水量、逐月的日最大降水量作为基本资料,探讨广东省降水量的时空分布特征、长期变化趋势及突变分析.Morlet小波变换表明各城市降水茸存在着7.8 a和11 a等周期变化,与厄尔尼诺和太阳黑子的运动周期相关.其次运用皮尔逊Ⅲ型分析3城市的最大日降雨量的极值分布情况,其中阳江站5年一遇的年最大日降水量300 mm,达到特大暴雨的标准.M-K检验表明阳江站和广州站降水量分别于1971、1981年发生突变,年降水量由少雨期进入多雨期,且R/S分析表明其增

利用北部湾沿海7个气象站建站至2008年最大风速资料,采用指数律风速廓线公式和"时次换算"方法订正最大风速,得到长年代10 m高处10 min平均年最大风速序列;采用极值Ⅰ型分布估算北部湾沿海各地50年一遇最大风速,通过伯努利方程计算基本风压.结果表明:北部湾沿海的基本风压以涠洲岛最大,达1.13kN/m2;其次是东兴、北海,分别为0.59和0.58 kN/m2:第三位是防城港和合浦,分别为0.49和0.47 kN/m2;最小是防城和钦州,分别为0.39和0.33 kN/m2,表明越靠近海的地方基本风压越

利用常规观测资料、卫星TBB和NCEP再分析资料,对2008年6月8-13日持续性暖区暴雨的环流特征、影响系统及物理量变化进行了诊断分析,结果表明:本次暴雨过程是在高层200 hPa出现环流型调整、500 hPa贝加尔湖至新疆地区为弱阻高形势和地面锋面低槽的环境下产生的,主要影响系统有低层切变线和低涡;低空急流迅速建立、北抬,使低层风速辐合加强是产生锋前暖区暴雨的有利因素;广西的中尺度环境存在南北明显差异,可能是形成双雨带的主要原因;在切变线和低涡切变锋区上垂直运动结构有明显差异,低涡切变上低层辐合高层强

利用1989-2006年封开县多时相TM影像提取NDVI,结合封开县气象站点逐年的气温和降水量资料,对18年来封开县植被时空演变对气候变化的响应作了分析.结果表明,1989-2006年封开县植被覆盖度呈上升趋势,低覆盖植被面积减少10%,高覆盖植被面积持续扩大,增长了2.3倍;年均气温随全球气温变暖而升高,而降水量则有减少的趋势:植被覆盖变化表现出对气温变化的显著响应.

为探索BRT方案在高密度开发地区实施的可行性及其运行效益,采用实地调查与案例分析的方法,以广州中山大道BRT干道的设计为例,结合中山大道现有交通组织特点,指出BRT建设可能对其交叉路口交通组织、周边线路的联动和车辆过量占道等方面造成影响,认为实现"人地车"的协调才是城市交通规划的关键;提出促成交叉口BRT优先通行技术和ITS(智能交通系统)技术的应用、进一步优化运营模式、适当限制私人交通、合理规划公交地铁的驳接和大力发展快速公交并构建快速公交网络系统等措施.

基于对泉州沿海大通道沿线土地利用的实际调研,对沿海大通道修建前后的资料和数据作分析、对比,研究结果发现,沿海大通道建设一方面使沿线土地增值,改善土地利用空间结构,带动区域旅游业发展和有效提高沿海抗风浪能力;另一方面却导致了城市用地规模无序蔓延,土地建设质量和土地空间利用效率低下,还对沿线海岸带生态环境造成一定的损害.为此提出了道路沿线土地合理利用建议.

利用国家民政部、统计局等部门公布的相关资料,对新中国成立以来的乡镇政区发展演化的内在机制作深入剖析,从我国小城镇发展战略、行政区划改革趋势、现行设市模式与县辖政区体制及其弊端以及城市化发展的客观要求等方面,论述我国实行县下辖市体制的可行性,并论述未来县辖市体制基本内容:设市体系--构建我国未来三级市制体系:直辖市、省辖市、县辖市三级市制;设市模式--实行"城郊合治"管理理念下的"适度切块设市"模式:设市标准---台理拟定县辖市设置的标准;审批制度--确定未来我国县辖市的审批程序与审批机构.同时在分析目前挚

以我国铁路枢纽城市怀化为例,利用城市规划土地利用现状图、1:10000地形图、遥感影像图、社会经济统计数据以及其他相关资料,借助ArcGIS 9.2软件平台和统计分析软件(SPSS 11.5),采用地统计分析、空间形态分析、等扇分析及分形理论方法等研究方法,从城市扩展强度、扩展形态和扩展分异3个方面分析其扩展特征,最后在分析影响怀化城市空间扩展驱动力的基础上总结了其扩张机制.

基于分形理论对广西城镇体系空间结构进行研究,发现广西城镇空间分布具有统计分形特征.关联维数和牛鸦维数测算结果显示:广西城镇高度集中于河流和交通线两侧,城市之间的交通网络发育较为成熟.聚集维数测算结果表明:广西城镇空间分布不均衡,密度差异大,"双核心"结构明显.认为这些特征的出现是地理位置、自然条件、历史、交通、政策等因素共同作用的结果.

为了帮助实现城市人居环境建设的"人本主义"回归,利用系统学方法构建了"人居环境满意度"与"人居环境建设水平"综合分析的评价模型,在此基础上搭建主客观耦合的指标体系,并利用AHP法求得各指标的权重.文中以广州市为例,对城市人居环境的客观水平和主观满意度进行了综合评价.结果显示,满意度与建设状况呈现趋同与趋异两种状况.基础设施建设的速度最快,满意度最高;公共服务设施发展滞缓,满意度较低.对于"居住、环境卫生、生态维护"等指标,虽然客观建设速度突飞猛进,但居民对其仍十分不满意.了解民意,不断缩小人居环境供给(建

Producer services are essential sector to facilitate economic growth and shape regional economies. They have experienced dramatic expansion in China in the recent decade. This paper attempts to identify the nature of producer service growth and analyze their spatial development in the Chinese urban system from a disaggregated perspective. The findings suggest that (1) despite their impressive growth over the past decade,producer services accounted for a relatively low share of the national economy in terms of both output and employment; and (2) geographically, producer services are becoming spatially more concentrated across the urban system, which has significantly reorganized urban hierarchy and inter-city connections. Stimulated by economic growth and policy support from the central government,producer services in China are expected to continue to grow at a rapid speed. The development of producer services has become a new and popular strategy for urban development in many Chinese cities in the era of globalization. However, the unequal distribution of producer services suggests that large and extra-large cities will be more competitive in the new wave of urban development. As such, small and medium cities need to conduct careful market studies and analyses before they initiate projects for producer service development to avoid the waste of land and investment.

Community health service is one of the key elements of basic public service that is community-oriented and to solve the basic medical needs of primary health service. The main structure and operation system of public service provision change because of China's social and economic transition. Community health service at the present stage has dual properties, the market mechanism is introduced into on the one hand, and traditional institutional characteristics still exist on the other hand. The paper uses the sixth census data provided by the Guangzhou Municipal Bureau of Statistics as a source of demographic data, community health care institutions provided by the Health Bureau of Tianhe District as the source of community health service, and takes Tianhe District in Guangzhou as a case to be studied. In the paper four types of supply models in community health services in Tianhe district in Guangzhou are summed up: government supply, work unit supply, collective economy supply and market supply. They are all under the leadership of the Health Bureau, supervised by the government and serve as the basis of the urban health care system. At the same time they have differences in the main supply, service targets, financing and financial management and personnel management. Both the common and different features of the various modes of supply form a complementary system of coexisting multivariate models. Based on the analysis of the coexistence of the multi-mode system, we draw the conclusion that the quasi-public properties of the community health services, the transformation of social and economic system and urban-rural dual system, the diverse needs of the residents and the interests of the different supply and their combined effects make the mechanism of multi-mode coexistence. Only taking full advantage of multi-mode supply, full range of coordination mechanisms and reasonable system design can gain access to equalization of community health services.

This paper uses the tabulations from 2000 and 2010 Population Censuses of Guangzhou to investigate the city’s demographic distribution and spatial structure. Spatial analysis, monocentric and polycentric population density models are implemented as analytical tools. The results are as follows: (1) The population spatial dynamic distribution of Guangzhou is that “population of the inner suburb grows fast, while that of the outer suburb slower, and that of the core circle the slowest”. (2) The population of Guangzhou’s inner city keeps growing and it also spreads to the suburban areas. Guangzhou’s polycentric structure has been consolidated by the increment of its subcentres. In 2000 there were two subcentres (Xinjing Street in Baiyun District and Fengyang Street in Haizhu District) and in 2010 there were six (Tongde Street in Baiyun District, Fengyang Street in Haizhu District, Tangxia Street and Shahe Street in Tianhe District). The subcentres are able to attract more people and also affect population distribution more significantly.

The Pearl River Delta (PRD) is one of the regions with fastest economic development in China. The process of population concentration and decentralization in this region has been being focused by researchers. In this study, based on the population census data in the PRD from 1982 to 2010, we analyzed the growth and reduction of population, the concentration level of population and stability of population so as to investigate the change of spatial pattern of the population’s concentration and decentralization. The results showed that: (1) The growth rate of population from 1982 to 2010 in the PRD was 215.61%, which far exceeded the growth rate averaged over the whole country; (2) The population increased more significantly in the middle and east parts of PRD; (3) The population agglomerating level in the PRD was greater than that in the whole country. The city of Shenzhen, Guangzhou and Dongguan had become the cluster centers in PRD; (4) More and more floating population moved into PRD, especially in the middle and east parts, from 1982 to 2010. The increasing population and agglomerating level of population in the study region were mainly due to this influx. However, the rate of the influx in PRD slowed down in the past decade.

In this paper the risk assessment index system is divided into 4 levels: the hazard of risk sources, the exposure of risk receptor, community’s capacity to cope with the risk, and risk perception of residents. The risk is assessed with catastrophe progression method. Chigang community of Humen town,Dongguan, is taken as an example to be studied. Recursive calculation is made through normalization of various index. The results show that the risk assessment value for Chigang is 0.295 and the public safety risk is very low, namely the public safety is high. Based on catastrophe progression method, the community risk assessment indexes are selected from subjective and objective aspects, in which the residents' risk perception is specially emphasized. So the advantage of catastrophe progression method can be brought into full play. It is expected that the result of the study could better evaluate city community public safety.

The Chaozhou Cuisine can be traced back as early as Qin Dynasty. By Ming and Qing Dynasties, the style of Chaozhou Cuisine had been formed. It has experienced late development and catched up with other cuisines in China. From the perspective of cultural geography, this article explains that Chaozhou Cuisine, with its core culture, originated in the Chaozhou-Shantou plain. However, the key node of its development lays in Hong Kong. With the tide of trading business in Hong Kong, the Chaozhou Cuisine rise toward gentrification and fine food. Along with the migration of Chaozhou-Shantou people, Chaozhou Cuisine has formed a tripod pattern of Chaozhou-Shantou local, Hong Kong and Southeast Asia-style and spread to all over the world. The development of Chaozhou Cuisine and its characteristics are closely related to the physical geography, human culture and economic environment. It is distinguished by its banquet style, taste, and process methods. The authors propose that the future development of Chaozhou Cuisine is to focus on the promotion of the concept of health, and enhance of the quality of cultural element and food processing. The refined food of the Chaozhou spirit will improve its competitiveness.

By using the method of variation coefficient, Gini coefficient and multivariate Moran’s I, this paper reveals the features and evolution of spatial economic effects of intra－regional disparity and extra－spatial correlation of tourism in Hunan province from 2001 to 2010. It is demonstrated that shrinking regional disparity of tourism does not necessarily imply that tourism development will narrow the gap of regional economic development. The results suggest that the regional difference of tourism is reduced continuously in the province, that only indicates that the effects to enlarge the regional economic difference are weakening. But the concentrative degree of tourism spatial distribution is decreasing, indicating that the influences of tourism development on adjusting spatial concentration of regional economy are changing from the effects of enlarging the economic gap to the ones of narrowing the gap, and the effects of enlarging the gap are weakened continuously, while the ones of narrowing the gap increasing. On the other hand, as a whole, extra－spatial correlation of tourism does not significantly enlarge the regional development disparity, but the increasing local spatial correlation of tourism enlarges the disparity of local regional development because of strengthening the formed pattern of regional economic disparity.

This paper uses a revised gravity model to build tourism economy relationship network of 16 cities in the Yangtze River Delta, and uses the method of SNA to analyze the network and explain the reason of their spatial differences. The density of the tourism economy relationship network of the Yangtze Delta is 0.533, the size is 128, and the diameter is 3. The density of the network is at a middle level. The results of the analysis of centrality, power index, structural holes, and core-periphery degree show that Shanghai has the highest scores, being the core zone of the network, while Zhoushan and Taizhou have low scores, being the periphery zone of the network. The analysis of spatial autocorrelation shows that the spatial clustering trend has a strong positive correlation with network characteristics, the position of each city in the network is very important, which can have a great influence on the development of its tourism economy. Social network analysis can reveal the internal mechanism of regional tourism development differentiation; and can provide a new perspective for analysis of the regional tourism differentiation.

The use of magnetic susceptibility characteristics of the urban road dust to reflect the city's pollution is an important part of the environmental magnetic studies. The results of road dust magnetic susceptibility of Xuchang city show that: Road dust magnetic susceptibility ranges from 98.33～600.92×10-8 m3·kg-1, and the average value is 319.72× 10-8 m3·kg-1, frequency magnetic susceptibility ranges from 0.20～5.94%, with an average of 1.92%. The high magnetic susceptibility values and the low frequency magnetic susceptibility suggest that road dust has less super paramagnetic particles content, and the high magnetic susceptibility is mainly caused by the magnetic particle deposition due to human activities. Spatial characters of road dust magnetic susceptibility display a decreasing trend from northwest to southeast, which mainly caused by the city's function zoning, population density, traffic flux and environmental quality. The road dust samples of Tiexi District and the Old District have the highest magnetic susceptibility values, reflecting the serious environmental pollution that caused by high population density, heavy traffic flux and industrial activities. In East District, High-tech Development District and Southeast District the road dust magnetic susceptibility values are lower, indicating the better environmental condition. Moreover, due to the heavy traffic in the commercial centers and the freeway entrances, road dust magnetic susceptibility values are higher than those in surrounding areas. The magnetic susceptibility characteristics of road dust can intuitively reflect the pollution of the city.

The extensive exploitation and overuse of the of resources have resulted in environmental pollution and ecosystem damages in the Pearl River Delta area. The article focuses on the heavy metal contents of mosses in Guangzhou, Zhaoqing and Huaiji, which represent the core area, periphery area and outside area of Pearl River Delta area, respectively. The result shows that the contents of heavy metals of mosses present a gradient distribution, reflecting the fact that the development of industry and transportation increases the emission of heavy metals in the area. The emission of Cu, Pb, Zn, Cr and Cd in Guangzhou is the highest among the three cities, where the average contents of those elements in mosses are 47.64, 68.83, 252.87, 64.20, 1.02 mg/kg,respectively. and that of Huaiji is the lowest, where the average contents are 16.42, 11.80, 97.13, 32.43, and 0.21 mg/kg, respectively. Zhaoqing is situated between Guangzhou and Huaiji, where the average contents are, respectively, 36.34, 40.51, 143.49, 51.29, and 0.64.mg/kg. The difference of the heavy metal contents reflects the difference of their sources. There is a positive correlation among Cd, Pb, Zn and Cu, that shows that they come from the same pollutant source. However, the relative weak correlation between Cr and Cd, Pb, Cu, Zn shows that Cr has different pollutant source. Maybe Cr has low possibility to pollute the atmosphere. When the industrial upgrading of Guangzhou reaches a certain level and the tertiary industry takes up proper proportion, the situation of heavy metal pollution of mosses would remain at a stable and low level.

Urban renewal is an important way of urban development, the key and difficulty lie in equilibrating the game of the rights and interests between stakeholders. In the period of rapid development of urbanization, there is a large-scale urban renewal in our country, which makes the game of rights and interests in China's urban renewal form unique pattern and characteristics, and it is also more complicated than that in western developed countries. This paper points out that, with the deepening of studies on China's urban renewal, some achievements have been gained in the studies of game of stakeholders' rights and interests. But there are some problems and shortcomings need to be solved in the studies, such as the relationship between the stakeholders and social movement phenomena in urban renewal. Future studies should make comprehensive use of the multidisciplinary theories, focus on in-depth study of the typical cases, and gradually build a game theory of the rights and interests in urban renewal based on China's national conditions.