渤海湾渔业碳汇分析与预测初探     

陈燕珊  万萌萌  林锟  于贞贞  王睿  谭丽菊  王江涛 《海洋科学》2022,46(9):77-84

为了解渤海湾近十年来渔业碳汇能力,本研究汇总了渤海湾地区2010-2020年海水养殖的品种和产量。通过建立不同养殖品种固碳能力评估体系,计算了不同养殖品种对渔业碳汇的贡献和渤海湾近十年海水养殖固碳总量。结果表明,2010-2020年渤海湾海水养殖以池塘养殖为主要养殖模式,年固碳量从2010年的5.79万吨增至2020年的11.04万吨,十年内共计固碳96.0万吨,平均碳转化比为12.5%,其中山东省贡献超过65%。该探索对建立“渔业碳汇”计算的指标体系、科学发展碳汇渔业、提升海洋碳汇生态价值具有一定的指导意义。  相似文献   

海洋牧场背景下的休闲渔业旅游发展模式研究   总被引：1，自引：0，他引：1       下载免费PDF全文

宋昱瑾  田涛  杨军  刘敏  吴忠鑫  高东奎  尹增强  李晓钰 《海洋开发与管理》2022,39(1):110-116

近年来随着产业融合的发展趋势显著,第一产业和第二产业开始向第三产业转型,海洋牧场建设发展过程中渔业与旅游业逐渐融合发展形成休闲渔业等渔业旅游形式。许多地区因地制宜形成了不同的休闲渔业发展模式,休闲渔业旅游发展多元化的趋势也在逐渐形成。文章对休闲渔业的概念进行了阐述,介绍了休闲渔业的产生与发展,并对我国休闲渔业的旅游模式进行归纳,提出当前休闲渔业发展存在的问题。如:发展观念滞后,缺乏长远规划;海洋休闲渔业产业结构单一;缺乏高素质的从业人员;科技、资金投入不足等。最后总结了海洋牧场背景下休闲渔业的未来发展趋势并对发展方向提出建议。  相似文献   

Stock assessment for Atlantic yellowfin tuna based on extended surplus production model considering life history     

Zhipan Tian  Fei Wang  Siquan Tian  Qiuyun Ma 《海洋学报(英文版)》2022,41(8):41-51

The modern fishery stock assessment could be conducted by various models, such as Stock Synthesis model with high data requirement and complicated model structure, and the basic surplus production model, which fails to incorporate individual growth, maturity, and fishery selectivity, etc. In this study, the Just Another Bayesian Biomass Assessment (JABBA) Select which is relatively balanced between complex and simple models, was used to conduct stock assessment for yellowfin tuna (Thunnus albacares) in the Atlantic Ocean. Its population dynamics was evaluated, considering the influence of selectivity patterns and different catch per unit effort (CPUE) indices on the stock assessment results. The model with three joint longline standardized CPUE indices and logistic selectivity pattern performed well, without significant retrospective pattern. The results indicated that the stock is not overfished and not subject to overfishing in 2018. Sensitivity analyses indicated that stock assessment results are robust to natural mortality but sensitive to steepness of the stock-recruitment relationship and fishing selectivity. High steepness was revealed to be more appropriate for this stock, while the fishing selectivity has greater influence to the assessment results than life history parameters. Overall, JABBA-Select is suitable for the stock assessment of Atlantic yellowfin tuna with different selectivity patterns, and the assumptions of natural mortality and selectivity pattern should be improved to reduce uncertainties.  相似文献   

镇江长江豚类省级自然保护区鱼类多样性及年际变化     

潘杰  王召根  章旭日  刘凯 《广东海洋大学学报》2021,(1)

【目的】调查了解镇江豚类保护区鱼类资源状况,丰富鱼类资源本底数据。【方法】于2013、2016和2019年,分别开展3次渔业资源调查,对该区域鱼类种类组成、优势种、体型大小及群落多样性进行统计分析。【结果】共记录鱼类68种属于7目13科47属;鲤形目(Cypriniformes)鱼类种类占比较为稳定,鲇形目(Siluriformes)鱼类资源量有下降趋势,鲈形目(Siluriformes)鱼类种类占比上升明显;不同年份优势种替代较为明显;2016年的物种丰富度指数和多样性指数最高,分别为6.528、3.026。【结论】保护区鱼类资源较为丰富,但不同年份鱼类群落变化较为明显,渔业资源面临小型化趋势。  相似文献   

渔村社区转型管窥--湛江市遂溪县某渔村个案分析     

周春霞 《广东海洋大学学报》2006,26(2):12-16

随着渔业经济的发展,捕捞强度过大使得渔业资源严重衰退,渔村社区面临转型的困境.以调查村为例从产业结构、管理体制、文化教育管理、生活方式等四个方面对其现实的状况与困境进行分析,并在此基础上提出转型的相应对策措施,以期为相关政府部门的决策提供参考和借鉴.  相似文献   

渔村社区转型管窥——湛江市遂溪县某渔村个案分析     

周春霞 《广东海洋大学学报》2006,26(2):12-16

随着渔业经济的发展，捕捞强度过大使得渔业资源严熏衰退，渔村社区面临转型的困境。以调查村为例从产业结构、管理体制、文化教育管理、生活方式等四个方面对其现实的状况与困境进行分析，并在此基础上提出转型的相应对策措施，以期为相关政府部门的决策提供参考和借鉴。  相似文献   

上海市地下商业空间使用权估价及空间分异     

石忆邵  周蕾 《地理学报》2017,72(10):1787-1799

目前的土地估价不仅很少考虑地下空间价值,而且缺乏相对成熟的地下空间估价体系和方法。首先结合成本法、收益还原法及楼层效用比法,建立地下空间使用权价格评估模型。然后,分析了地下空间使用权价值的主要影响因素,发现区位、交通、商业经营等因素显著影响地下商业空间的效用;指出为了提高估价的准确性,地下商业空间效用应该分级、分类设置,而不能笼统地确定为同一水平,并据此测算出上海市地下空间使用权地价分配率。基于所构建的评估模型,以上海市地下商业空间为例,通过克里金内插法,廓清了上海市地下空间使用权价格的空间分布状况;最后,从典型购物中心、市级商业中心和全市商业用地成交地块三个维度,探讨上海市地下商业空间使用权价格的空间分异特征。结果表明：① 上海市地下空间使用权价格空间分布与地上土地使用权价格分布规律基本一致,并由市中心向郊区递减;② 地下商业空间使用权价格对地下轨道交通具有较强的依赖性;③ 与地上商业空间使用权价格分布相比,地下商业空间使用权价格分布的集聚性特征更明显。  相似文献   

Research on the Development Status and Strategy of Productive Rooftop Gardens on Commercial Complexes     

ZHENG Jie  SUN Lulu 《资源与生态学报(英文版)》2021,12(3):409-418

The introduction of productive gardens on public building roofs is an active way to use urban idle space. It has ecological, economic, and social values and helps alleviate many urban problems caused by the rapid advancement of land urbanization. This paper takes the productive rooftop garden of an urban commercial complex as an example, and assesses its development status based on methods including ArcGIS, field research, and questionnaire interviews, combined with the overall aspects of the country and key case analysis. The results indicate several key aspects of the current status of such gardens in China. (1) As affected by natural and social factors, the current spatial distribution of productive rooftop gardens of commercial complexes in Chinese mainland is uneven, with 84.21% located in the southeast coast and the Sichuan region. (2) The operation and development of this type of productive landscape is in good shape. The number of rooftop gardens has continued to increase since 2013, and the scale is generally greater. Currently, the business model which combines nature education and parent-child amusement experience activities is the most stable. (3) Cases in good operating condition tend to have relatively related characteristics in layouts, traffic functions, landscape elements, and space design. (4) Questionnaire interviews show that citizens are highly willing to participate in rooftop productive landscapes, while operators still experience challenges in policies, funds, and planting knowledge in practice. This paper analyses the existing problems in the development status and strategy of the rooftop productive landscape. It proposes complementary optimization strategies to serve as a reference for the rooftop design of commercial complexes and the utilization of a significant amount of idle space on the roofs.  相似文献   

底拖网作业对珠江口香港海域底层鱼类的影响     

孙颉  彭俊豪  谭振耀  陈金满  佘书生  刘敏 《广东海洋大学学报》2020,(1):64-68

【目的】研究底拖网作业对珠江口香港海域底层鱼类的影响。【方法】根据2007-2009年及2014-2016年在珠江口香港海域进行的定点底拖网调查数据,分析该海域在禁止底拖网捕捞实施前后鱼类种类组成及生物量和生态多样性指数,评估5种典型底层鱼类资源的变化。【结果与结论】该海域捕获鱼类种类数在禁止底拖网作业后明显增加,鱼类种类数量从44种升至73种。种类丰富度指数D变化范围为:2007至2009年,4.937~5.711,2014至2016年,6.559~7.074;多样性指数H'变化范围为:2007至2009年,1.945~2.841,2014至2016年,2.220~2.381;均匀度指数J变化范围为:2007至2009年,0.539~0.776,2014至2016年,0.557~0.600。卵鳎Solea ovata、韦式羊舌鮃Arnoglossus waitei、尖嘴魟Dasyatis zugei这3种底层鱼类禁止底拖网实施后在数量(number)和生物量(biomass)上都增幅明显。不同站位数量和生物量的数值在“禁拖令”实施后也都有所增加,其中以站位2(大屿山以北,较靠近香港国际机场海域)增加最为显著。  相似文献   

Seasonally and spatially referenced estimates of recreational shore-angling effort,catch composition,catch rates and total catch in the Goukamma Marine Protected Area,South Africa     

CG Attwood  CS van Zyl  AT Lombard  C McCagh 《African Journal of Marine Science》2016,38(4):563-579

A roving creel survey of the recreational shore fishery along the 16.4-km coastline in the Goukamma Marine Protected Area on the south coast of South Africa was conducted from 2009 to 2011. Some 838 patrols were stratified equally among months, areas and years, but intentionally biased towards weekends. Angler densities at Buffalo Bay and Groenvlei were 0.59 and 0.28 anglers km?1, respectively. Weekend densities were double to quadruple weekday densities and fishing during winter was more popular than during summer. Area, habitat and distance to access points explained variation in angler densities. Shannon–Wiener diversity in catches declined from 2.18 in an earlier (1993–2002) survey to 1.79. Although the order of species abundance in the catches remained largely unchanged, blacktail Diplodus capensis dominance increased to 57.3% by number, at the expense of galjoen Dichistius capensis. Habitat explained 27% of the variance in catch composition. The catch per unit effort (CPUE) for the top nine species ranged from 0.19 to 6.35 fish 100-h?1. The CPUE of all species, except spotted grunter Pomadasys commersonnii, declined. Blacktail and galjoen CPUE declined by 17% and 77%, respectively. The total catch estimate was 2 986 fish y?1. Transgressions of size limits were common. The results suggest that the fishery is overexploited and that catch rates are declining.  相似文献