In order to analyze the improvement of fish resource,the trawl net and gill net were used in the background survey and investigation in the artificial reef area and control area of the east of corner was discussed in ...In order to analyze the improvement of fish resource,the trawl net and gill net were used in the background survey and investigation in the artificial reef area and control area of the east of corner was discussed in Zhelang Shanwei in January 2003 and April 2010 respectively.Margalef species richness index,Shannon-Winener diversity index and Pileou uniformity index were chosen to analyze the multiformity of biological population and community structure.Resource density index of trawl net investigation and catch rate of gill net were chosen to estimate the variance of biomass.The results of the trawl net showed that the resources density of the artificial area increased by 3.078 times,and numbers of species increased by 1.875 times,squilla being the dominant group instead of the fish,and the first dominant species being squilla oratoria(Oratosquilla oratoria),which increased by 4.372 times before the artificial reef dropped.The results of the gill net showed that the catch rate of the artificial area increased by 12.043 times,numbers of species increased by 1.333 times,the dominant group was fish,it increased greatly,the first dominant species was golden small fish(Sardinella aurita),which increased by 13.035 times before the artificial reef dropped.Both the results of trawl net and gill net indicated that the effect of fish assemblage were evident,and the community structure had improved greatly.It showed a wonderful effect on conservation and assemblage of fishes resource.The artificial reefs developed a new resource enhancement system in the east corner of Zhelang Shanwei accomplished basically.展开更多
Urban planning decision-making is an activity for the decision-makers to collect information, judge function of cities, select project and make policy which is ainaed at the problem of urban planning that have taken p...Urban planning decision-making is an activity for the decision-makers to collect information, judge function of cities, select project and make policy which is ainaed at the problem of urban planning that have taken place, is taking place and will take place. Using historical review and comparative analysis, the articles summarizes planning decision-makings of Shanwei city and it＇s problem, and makes some suggestions to urban planning decision-making system of Shanwei city in the new period.展开更多
为了给汕尾市防灾减灾管理及国土空间规划提供科学依据,笔者基于ArcGIS平台,采用信息量法进行汕尾市地质灾害风险评价和区划,并在此基础上提出风险管控建议。结果表明,汕尾市地质灾害类型包括崩塌、滑坡、泥石流,规模以小型为主。时间上...为了给汕尾市防灾减灾管理及国土空间规划提供科学依据,笔者基于ArcGIS平台,采用信息量法进行汕尾市地质灾害风险评价和区划,并在此基础上提出风险管控建议。结果表明,汕尾市地质灾害类型包括崩塌、滑坡、泥石流,规模以小型为主。时间上,地质灾害主要发生在4至10月,空间上,地质灾害主要分布于陆河县。地质灾害高风险区、中风险区、低风险区面积占比分别为6.59%、29.81%、63.60%,其中高风险区面积289.81 km 2,主要分布于北部低山地区、西南局部丘陵地区、中东部低山地区。提出地质灾害风险管控建议:加强地质灾害隐患识别,完善地质灾害风险评价工作,全力做好重点时段的地质灾害防范工作。展开更多
基金Supported by National Public Industry Scientific Research Program(201003068)National"863"Program(2006AA100303)National Financial Program(2009-2012)
文摘In order to analyze the improvement of fish resource,the trawl net and gill net were used in the background survey and investigation in the artificial reef area and control area of the east of corner was discussed in Zhelang Shanwei in January 2003 and April 2010 respectively.Margalef species richness index,Shannon-Winener diversity index and Pileou uniformity index were chosen to analyze the multiformity of biological population and community structure.Resource density index of trawl net investigation and catch rate of gill net were chosen to estimate the variance of biomass.The results of the trawl net showed that the resources density of the artificial area increased by 3.078 times,and numbers of species increased by 1.875 times,squilla being the dominant group instead of the fish,and the first dominant species being squilla oratoria(Oratosquilla oratoria),which increased by 4.372 times before the artificial reef dropped.The results of the gill net showed that the catch rate of the artificial area increased by 12.043 times,numbers of species increased by 1.333 times,the dominant group was fish,it increased greatly,the first dominant species was golden small fish(Sardinella aurita),which increased by 13.035 times before the artificial reef dropped.Both the results of trawl net and gill net indicated that the effect of fish assemblage were evident,and the community structure had improved greatly.It showed a wonderful effect on conservation and assemblage of fishes resource.The artificial reefs developed a new resource enhancement system in the east corner of Zhelang Shanwei accomplished basically.
基金Acknowledgments The authors gratefully acknowledge the financial support provided by Foundation for Distinguished Young Talents in Higher Education of Guangdong, China （Project No： wyrnl1049） and the Natural Natural Science Foundation of China （Project No. 40901066）.
文摘Urban planning decision-making is an activity for the decision-makers to collect information, judge function of cities, select project and make policy which is ainaed at the problem of urban planning that have taken place, is taking place and will take place. Using historical review and comparative analysis, the articles summarizes planning decision-makings of Shanwei city and it＇s problem, and makes some suggestions to urban planning decision-making system of Shanwei city in the new period.
文摘为了给汕尾市防灾减灾管理及国土空间规划提供科学依据,笔者基于ArcGIS平台,采用信息量法进行汕尾市地质灾害风险评价和区划,并在此基础上提出风险管控建议。结果表明,汕尾市地质灾害类型包括崩塌、滑坡、泥石流,规模以小型为主。时间上,地质灾害主要发生在4至10月,空间上,地质灾害主要分布于陆河县。地质灾害高风险区、中风险区、低风险区面积占比分别为6.59%、29.81%、63.60%,其中高风险区面积289.81 km 2,主要分布于北部低山地区、西南局部丘陵地区、中东部低山地区。提出地质灾害风险管控建议:加强地质灾害隐患识别,完善地质灾害风险评价工作,全力做好重点时段的地质灾害防范工作。
