Spatial analysis of water quality and its suitability in farming giant freshwater prawn (Macrobrachium rosenbergii) in Negeri Sembilan region,Peninsular Malaysia     

Benjamin Ezekiel Bwadi  Firuza Begham Mustafa  Mohammad Lokman Ali  Subha Bhassu 《Singapore journal of tropical geography》2019,40(1):71-91

Finding potential sites for resilient prawn production in the tropical environment that also prevents wastage of natural resources is not an easy task. The purpose of this study is to evaluate water quality suitability for prawn farming in Negeri Sembilan of Peninsular Malaysia based on Geographic Information System (GIS). To achieve this goal, numerous criteria including sources of water, water temperature, water pH, sources of pollution, salinity, soil texture and availability of phytoplankton criteria were considered for the modelling process. Analytic Hierarchy Process (AHP) technique was performed to standardize the criteria and the weighting process. The weighted overlay of indicators and results were accomplished by applying the Multi‐Criteria Decision Analysis (MCDA) method in GIS. It was indicated that the Negeri Sembilan area has potential for prawn farming. The results showed that about 25 per cent (163 056.93 ha) of the area was most suitable for prawn farming, about 58 per cent (384 656.88 ha) was considered moderately suitable, while 18 per cent (117 633.49 ha) was regarded as least suitable. The study concluded that the multi‐criteria decision analysis of water quality for prawn farming is vital for regional economic planning in the Negeri Sembilan area and also significant when establishing a model for aquaculture development.  相似文献   

An Evaluation of Phase Behaviors of the Oil-Gas-Water System in the Displacement of Crude Oil with CO₂          下载免费PDF全文

ZHANG Angang  FAN Zifei  HE Jun 《《地质学报》英文版》2023,97(2):573-580

CO₂ dissolution into an aqueous phase and water evaporation into a gaseous phase takes place during CO₂ injection into an oil reservoir. This study aims to evaluate the phase behaviors of the oil-gas-water system in the displacement of crude oil by CO₂. The composition of the JL oilfield in the northeast of China is taken as an example. The flash calculation of the oil-gas-water system was performed, based on the method presented by Li and Nghiem. The research re...  相似文献   

Relational Agriculture: Gender,Sexuality, and Sustainability in U.S. Farming     

Isaac Sohn Leslie  Jaclyn Wypler  Michael Mayerfeld Bell 《社会与自然资源》2019,32(8):853-874

Although 97% of U.S. farms are “family-owned,” little research examines how gender and sexual relationships – inherent in familial dynamics – influence farmers’ practices and livelihoods. Gender and sexual dynamics – shaped by race and class – affect who is considered a farmer, land management decisions, and access to resources like land, subsidies, and knowledge. We use feminist and queer lenses to illuminate how today’s agricultural gender and sexual relations are not “natural,” but when left uninterrogated are constructed in ways that harm women and queer farmers while limiting potential to develop sustainable practices. Women and queer farmers also resist, “re-orienting” gender and sexual relations in ways that expand possibilities for achieving food justice and ecological sustainability. We offer “relational agriculture” as a tool for making visible and re-orienting gender and sexual relations on farms. Relational agriculture brings sexuality into food justice and demonstrates the centrality of gender and sexuality to agricultural sustainability.  相似文献   

Are red tides affecting economically the commercialization of the Galician (NW Spain) mussel farming?     

Gonzalo Rodríguez Rodríguez  Sebastián Villasante  María do Carme García-Negro 《Marine Policy》2011

Harmful algal blooms (HABs), more specifically red tides, are among the most critical environmental factors affecting mussel cultivation in Galicia (NW Spain), and they often have been blamed for economic losses for producers. This statement is based on the correlation between days of closure of the production areas and unsold product. The present article shows that such a statement is not always correct, at least in the case of Galician mussel farming, because red tides only cause losses to producers under specific circumstances that arise from the impossibility of placing their product in the market. In addition, this article reveals the importance of finding organizational solutions within the framework of the production sector to counteract the impact of this type of phenomenon.  相似文献   

Sustainability evaluation of different systems for sea cucumber (Apostichopus japonicus) farming based on emergy theory     

Wang  Guodong  Dong  Shuanglin  Tian  Xiangli  Gao  Qinfeng  Wang  Fang 《中国海洋大学学报(英文版)》2015,14(3):503-510

Emergy analysis is effective for analyzing ecological economic systems. However, the accuracy of the approach is af-fected by the diversity of economic level, meteorological and hydrological parameters...  相似文献   

农谚在河南冬小麦种植及气候适应中的应用     

尹君  苏筠 《地域研究与开发》2011,30(4)

农谚是反映人地关系的地方性知识,研究其在农业生产中的应用及适用性,有助于理解人地关系的变迁及地域特点。收集整理河南冬小麦种植的农谚,归纳总结了冬小麦生育期的农谚时序表。进而利用洛阳、开封、信阳1951—2003年的气象观测数据,分析农谚与气候适应的关系。结果显示,随着气候的变化,农谚中的冬小麦适宜播种期比气象实测的适宜播种期略微早。农谚指出冬小麦越冬期怕冬暖,拔节孕穗期间怕春寒及灌浆需晴暖天气,均与实际观测的气象数据相符合。农谚指出了冬小麦缺水及容易出现旱情的生育阶段,并以此进行旱灾适应。  相似文献   

粟类作物稃片植硅体形态研究回顾与展望     

张健平  吕厚远  葛勇  邵孔兰 《第四纪研究》2019,39(1):1-11

中国是粟、黍的起源地,但受植物遗存保存状况及研究方法的限制,对粟类旱作农业起源与驯化的时间、地点、种类、过程等的认识仍然存在不同观点。植硅体分析为准确鉴定粟、黍及其野生祖本和亲缘物种提供了新的途径。本文总结了近几年来针对粟、黍种子稃片植硅体研究取得的新进展,获得以下认识:1)进一步明确了稃片表皮长细胞植硅体的形态特征、大小、数量是鉴定考古文化堆积中粟、黍及其野生祖本和亲缘野生物种的可靠指标;2)通过对比我国北方常见的狗尾草属稃片植硅体,发现了ΩⅢ型仅发育于粟和青狗尾草的稃片中部,且其大小与狗尾草属野生植物差异显著;3)分析和说明了稃片植硅体鉴定流程和方法、重点强调了稃片Ω/η类型的鉴定特征和应用范围,以及植硅体统计量等关键问题;4)讨论了粟类稃片植硅体产量与农作物产量的关系以及植硅体埋藏学问题,最后对深化粟类植硅体形态学研究提出了初步建议。希望通过本文的总结与讨论,能够使植硅体分析方法在粟类作物起源和传播的研究中得到更准确、更广泛的应用。  相似文献   

Effects of copper and the sea lice treatment Slice on nutrient release from marine sediments     

D.J. Mayor  M. Solan  K. Killham 《Marine pollution bulletin》2009,58(4):552-558

Copper-based antifoulant paints and the sea lice treatment Slice^® are widely used, and often detectable in the sediments beneath farms where they are administered. Ten-day, whole sediment mesocosm experiments were conducted to examine how increasing sediment concentrations of copper or Slice^® influenced final water column concentrations of ammonium-nitrogen (NH₄-N), nitrate + nitrite-nitrogen (NO_X-N) and phosphate-phosphorus (PO₄-P) in the presence of the non-target, benthic organisms Corophium volutator and Hediste diversicolor. Nominal sediment concentrations of copper and Slice^® had significant effects on the resulting concentrations of almost all nutrients examined. The overall trends in nutrient concentrations at the end of the 10-day incubations were highly similar between the trials with either copper or Slice^®, irrespective of the invertebrate species present. This suggests that nutrient exchange from the experimental sediments was primarily influenced by the direct effect of copper/Slice^® dose on the sediment microbial community, rather than the indirect effect of reduced bioturbation/irrigation due to increased macrofaunal mortality.  相似文献   

河南省耕地保护态势与社会责任问题探讨   总被引：2，自引：0，他引：2  

杨建波  王国强  王莉  翟慧萍 《地域研究与开发》2009,28(3)

运用综合分析法、历史分析法、比较分析法等,探讨了耕地保护的责任机制问题.认为政府在耕地保护中应承担主导责任,农民应承担参与责任、企业应承担节地责任.提出了构建新的耕地保护评价指标体系,改进现有管理办法;建立耕地保护的激励机制,提高耕地保护意识和主动性;积极推进全民参与的力度;重视中低产田改造和耕地生态环境防治问题等落实耕地保护共同责任机制的措施和建议.耕地保护需要构建"大家管、大家用、大家负责"的全社会的共同责任机制.  相似文献   

基于海温和环流特征量的江苏省小麦适播期预测   总被引：1，自引：0，他引：1  

高苹  张佩  谢小萍  胡洛林  项瑛 《气象》2012,38(12):1572-1578

基于江苏省60个气象台站1961-2010年冬小麦冬前生长期间的气温资料,利用曼-肯德尔法（Mann-Kendall method）分析发现,小麦冬前生长期间日均气温及有效积温在全球气候变暖背景下均有明显的增暖趋势。同时根据江苏省各地区冬小麦有记录以来的农业气象资料分析可得,播期与冬前总积温、有效积温具有极显著的相关关系,尤以有效积温更为显著,均通过了0．001显著水平检验,故可利用冬前有效积温确定冬小麦适播期。在此基础上,根据海气相互作用原理以及500hPa大气环流特征量能表征天气形势和控制天气条件的这一特性,利用最优化因子相关技术对海温及环流特征量进行普查,从中挑选一批与冬前有效积温相关显著、稳定性强、因子相互独立、可靠的海温和环流特征量作为长期预报因子,建立冬前有效积温的海温模型和环流模型,其拟合效果和试报效果甚佳,可投入业务应用,提前1-2月预测冬前有效积温,从而确定冬小麦适播期。  相似文献