舟山市围垦造地过程存在的问题及对策     

邱宜伦 《浙江地质》2011,(6):28-29

舟山作为海岛城市,土地资源十分有限,全市陆域面积1256．93平方公里,占区域面积的5．66％,人均耕地面积0．28亩,仅为浙江省人均耕地面积的74.4％,人多地少,用地情况十分紧张。随着浙江海洋经济发展示范区列入国家战略,今年国家批准设立“舟山群岛新区”,舟山必然成为我国拓展海洋战略空间的实践基地。  相似文献   

汉阴县生态系统服务价值变化研究     

王海杰  马鹏刚 《地下水》2011,(6):139-141

在分析1997-2007年土地利用的数量、结构和程度变化特点的基础上,参考Costanza、谢高地等人的研究成果,结合汉阴的实际情况,估算出研究区各年度生态系统服务价值并分析变化特点及其原因,结果可以看出汉阴县生态系统服务价值与经济的发展呈正相关.  相似文献   

Impacts of Typhoons Tianying and Dawei on seagrass distribution in Xincun Bay, Hainan Province, China   总被引：1，自引：0，他引：1  

YANG Dingtian  HUANG Daojian 《海洋学报(英文版)》2011,30(1):32-39

More than 50% of the typhoons landing in China have landed on the southeast coast, where they have caused great pressure on the coastal environment. Seagrass, one of the most important constituents of coastal ecosystems, is also greatly affected by typhoons. In order to clarify how seagrass distribution variation is affected by typhoons in coastal areas in southeast China, data of Typhoons Dawei and Tianying (category 4 and category 2 respectively, which just ran through the southern part of Hainan province) have been studied. In situ observation and satellite remote sensing data (CBERS-China Brazil Earth Resources Satellite) in 2004 and 2006 were used to retrieve seagrass distribution in Xincun Bay, Hainan province. In situ observations showed that leaf length, stem biomass and above ground biomass on average showed evidence of reduction after Typhoons Tianying and Dawei. However, seagrass density showed no evidence of reduction after typhoon Tianying and Dawei passed by and increased rapidly in January 2006. From results of satellite remote sensing data, seagrass distribution can be detected with high accuracy, and the area of seagrass distribution on the south coast of Xincun Bay in 2006 after the typhoon passed by was smaller than that in 2004 in region A and B. However, in region C, area of seagrass coverage under 20% increased. These results demonstrated that typhoons Tianying and Dawei damaged seagrass bed and helped seagrass to get rid of aged and dead leaves, and this correspondingly facilitated seagrass growth.  相似文献   

Studies on ecological characteristics variation and population dynamics of four lizardfishes in the southern Taiwan Straits   总被引：1，自引：1，他引：0  

DU Jianguo  LU Zhenbin  YANG Shengyun  CHEN Mingru 《海洋学报(英文版)》2011,30(6):72-81

The ecological characteristics of four lizardfishes, Trachinocephalus myops, Saurida undosquamis, Saurida tumbil and Saurida elongata, were studied from specimens (910 T. myops, 454 S. un-dosquamis, 686 S. tumbil and 744 S. elongata) collected monthly in the southern Taiwan Straits from April 2005 to March 2006. The population dynamics of the four lizardfishes was also discussed by the comparison with the previous studies. All being composed of 7 a classes; the dominant group of T. myops and S. tumbil was 1-2 a, while S. undosquamis and S. elongate were 2-3 a. The total mortality coefficient Z and the fishing mortality F were at high as indicated by the exploitation ratio E(>0.5), and a large number of by-caught juvenile and young fishes showing that the stock of lizardfishes in this area was overexploited and the fishing gear was irrational. Compared with the previous studies, the maximum and mean fork length, body mass and age of the four lizard-fishes declined gradually, the lizardfishes populations were younger in age and smaller in size. The asymptotic fork length L_∞ decreased while increasing growth coefficient k, and age at the inflexion point of mass t_r was younger compared with the previous studies. The declining of older ones has moderated the feeding competition and the younger ones grew faster. The larger mortality param-eters Z,M and F have revealed higher fishing pressure. The smaller change of the first mature fork length of female T. myops and the change from K selection pattern to r selection pattern of S. tumbil have indicated a more vulnerable fishery ecosystem in this area. The changes of ecological characteristics and population dynamics may be caused by over-exploitation of demersal fishes such as the lizardfishes, especially a large number of juvenile and young fishes by-catch by the current fishing gears and methods. Therefore, in addition to the traditional fishery management approach such as the minimum length-limit, ecosystem approach to fisheries management (EAF) should be taken to improve the practical marine ecosystem management, including increased fishing intensity of the non-economic species especially the feeding competitors of the lizardfishes and the conser-vation of the pelagic fishery population in the fisheries ecosystem, in order to restore the fishery population and achieve the sustainable use of the fishery stocks.  相似文献   

信息动态     

《海洋世界》2011,(4):6-6

2011年4月12日,国家海洋局联合沿海有关省、自治区海洋厅(局)召开新闻发布会,向社会公布我国第一批开发利用无居民海岛名录。此次国家集中公布的第一批开发利用无居  相似文献   

海岛风情素朴渔家     

《海洋世界》2011,(5):36-39

一代代渔民千百年来用心血和汗水打造的渔家文化中,包含着独特的民风民俗,有生活习俗、生产习俗、节日习俗、礼仪习俗等.渔船在出海之前,渔民总要到海神娘娘庙烧香烧纸,磕头许愿,求娘娘保佑平安;早年的渔船上还设香童,专职给供奉在船上的海神娘娘像烧香上供,以示敬重.  相似文献   

基于土地利用变化的生态系统服务价值核算——以江苏盐城滨海湿地为例   总被引：1，自引：0，他引：1  

周鑫  左平  滕厚峰  邹欣庆  陈浩 《海洋通报》2011,30(6):656-661

长三角一体化与江苏沿海开发上升为国家战略,使盐城滨海湿地面临空前的发展压力,如何正确认识滩涂的价值并加以合理利用是制定各项方针政策的前提.运用1987、1992、1997、2002、2007年共5个时相相Landsat数据来获得土地利用和景观的时空变化信息,综合运用直接市场价值法、间接市场价值法、替代成本法、Costa...  相似文献   

浙江海岛岸线分维数与其人工岸线比例的关系     

王欣凯  贾建军 《海洋学研究》2011,29(4):25-31

分形理论指出,曲线的分维数某种程度上反映了曲线形状的复杂程度.由于不同类型岸线的曲折程度相去甚远,其分维数必然存在明显差异,因此岸线的分维数中也包含了岸线类型的信息.本文以此入手,利用“908”专项“浙江省海岛调查”的海岛岸线成果,研究浙江省海岛岸线分维数与其人工岸线比例的关系.首先使用SMS 9.0软件以25,50,...  相似文献   

气候变暖对广东海岛风能发电影响的初步分析          下载免费PDF全文

郑兆勇  汤超莲  陈特固  蔡兵  邓松 《海洋开发与管理》2011,28(1):45-48

风能是一种清洁的可再生能源,具有极高的开发价值,风力发电是风能利用的主要形式.文章根据<中国海岛志·广东东部海岛>编纂过程中收集的沿海台站实测风速资料,采用对比方法分析全球气候变暖对广东海岛风速及风能发电的可能影响,得出近40年随着全球气候持续变暖,广东沿海近地层年平均风速下降率为0.2～0.1(m·s-1)/10a.风速减弱对风能发电有轻微影响.  相似文献   

我国颁发首个无居民海岛使用权证     

《国土资源》2011,(12)

近日,全国首个无居民海岛使用权证书颁发给了开发浙江省旦门山岛的企业。国家海洋局海岛管理办公室负责人表示,首个无居民海岛使用权证书的颁发,标志着我国海岛开发依法用岛的开始,也为今后其他无居民海岛开发项目的依法实施提供了经验。无居民海岛作为国家重要的自然资源,业主在开发海岛的同时,必须肩负起保护海岛的责任,对于海岛使用过程中造成的破坏,业主有义务对海岛生态进行整治修复。  相似文献