土地整理项目综合效益评价——以高安市为例     

姚玉镯  邹自力  刘红芳 《安徽农业科学》2012,(5):3038-3039

以高安市土地整理项目为例,从土地整理的经济、社会和生态效益3个方面入手,构建由经济效益指标、社会效益指标和生态效益指标组成的土地整理效益评价指标体系,采用层次分析法、成对比较法等方法对土地整理项目进行综合效益评价。该研究对土地整理效益的评价进行了有益的探索,对整理项目实施提供参考。  相似文献   

基于三标度层次分析法的农用地适宜性评价     

杜发兴  郑干 《安徽农业科学》2013,41(19):8340-8341,8388

基于层次分析法(AHP)基本原理,并通过三标度法的改进来定量确定农用地适宜性评价因子的权重和量化分级,克服评价因子的人为主观性,建立基于层次分析法的土地适宜性评价模型,使其更具有实用性。以湖北省枝江市为例,选取合理的评价因子对该地区的农用地利用适宜性进行评价,结果符合该地区实际情况。实例分析验证了三标度层次分析法在农用地适宜性评价中的适用性。  相似文献   

恶臭污染调查和测定评价的分析     

郑姣美  王学华 《安徽农业科学》2013,41(10):4581-4583

恶臭是一种感觉公害,由于既污染环境又危害人类的健康,所以恶臭污染已被许多国家定为七大公害之一。通过研究分析大量资料,阐述恶臭污染的调查和测定评价方面的进展,对当前恶臭调查和主要的评价测定方法进行了介绍,并分析其优缺点,指出恶臭调查和测定评价中存在的问题。  相似文献   

中国社会工作硕士学位论文现状与问题辨析——以49所试点院校3385篇论文为例     

祝西冰  赵杨  周敏 《中国农业教育》2019,(2):98-106

对49所试点院校社会工作硕士3385篇论文进行统计分析发现:选题以"本土社工实践梳理"为主且论文形式相对趋同,问题意识缺乏且研究问题与文献回顾关联少,研究设计部分以方法与技术描述为主且较少体现设计过程,主体部分呈现类实务报告状态,结论与讨论多为对策建议,大部分结论未有效回应研究问题且实务反思的学科贡献少。文章认为,有必要在明确专业学位研究生也应具备一定科研能力的前提下,培养学生包括问题意识、设计意识、开展能力和规范技巧等科研素养。  相似文献   

《花木栽培技术》的教学改革策略探寻          下载免费PDF全文

杨青焕赵秀娟  麦任娣黄晶 《现代农业研究》2019,(3):111-112

《花木栽培技术》是一门具有很强理论性和实践性的基础课程。现阶段《花木栽培技 术》课程教学中存在许多问题,在“宽专业、厚基础、重应用”的教育改革方向下,如何对《花木栽 培技术》教学进行科学、合理、有效的改革,提高《花木栽培技术》的教学质量和教学水平,值得一 线教育工作者进行深刻思考。本文以《花木栽培技术》教学中的问题为切入点,进一步探讨《花 木栽培技术》的教学改革策略。  相似文献   

地暖用木质地板TVOC释放规律研究     

方崇荣  唐荣强  甘美娇  徐漫平  郭飞燕 《林产工业》2019,46(8):35-39

采用1m3气候箱法和气质联用技术,测定并研究了三类地暖木质地板在常温和供暖条件下总挥发性有机化合物(TVOC)的浓度及释放规律,并对TVOC释放浓度进行了风险评估。结果表明:在供暖条件下,TVOC释放前期受温度的影响显著,后期减弱,超标风险依然存在;升温后TVOC释放浓度升高,随着时间的延长,浓度逐渐下降,72h后趋于稳定,可表征产品TVOC释放风险程度;在同等地暖环境条件下,TVOC释放风险为实木地板最低,其次为实木复合地板,强化木地板风险较高;常温下TVOC释放限量控制在140mg/m^3时,风险可控。  相似文献   

Aquaponics and sustainability: The comparison of two different aquaponic techniques using the Life Cycle Assessment (LCA)     

《Aquacultural Engineering》2017

Aquaponics is generally regarded as a sustainable practice, but its environmental burdens were not yet deeply investigated. In this study, Life Cycle Assessment (LCA) was used to assess the environmental impacts of two hypothetical coupled aquaponics systems (CAPS): Raft System (RAFT) and Media-Filled Beds System (MFBS). Rainbow trout (Oncorhynchus mykiss) and lettuce (Lactuca sativa) were considered as cultivated species in both systems. The Simapro^© software V.8.0 was used for calculation. The comparison between the two virtual systems indicated the floating technique as the less impacting one. Even though energy consumption appears to be higher in the floating system, LCA results were markedly influenced by the extensive use of inert materials in MFSB. In both systems, contribution analyses underlined that the main environmental impacts are related to infrastructures, electricity and fish feed. The LCA analyses carried out in this study highlights that the choice of less impacting materials, and the optimization of management practices, should be taken as priorities in order to reduce environmental impacts of this activity.  相似文献   

Hydrodynamic method for estimating production carrying capacity of coastal finfish cage aquaculture in Southeast Asia     

《Aquacultural Engineering》2020

This paper presents the development of a simple and generally applicable hydrodynamic method for the estimation of production carrying capacity (PCC) of coastal finfish cage aquaculture. Dimensional analysis was used to find significant and general interdependencies between the hydrodynamics at fish farm locations and particulate wastes deposited on the seafloor by fish farms. Modeled ratios of deposition to emission of particulate wastes underneath fish farms were found to be primarily a function of the flow Reynolds numbers at the farming locations and the non-dimensional settling velocity of emitted wastes. In the non-dimensional model, farming conditions include daily feed rate, proportion of unconsumed feed, and carbon content in feed and fish feces. The relationship can be used to estimate the PCC of floating net cages imposing a threshold value for deposition. Results of in-situ assessments of the benthic impacts of several fish farms in an aquaculture site in the northwest of Bali, Indonesia were used to validate and demonstrate the effectiveness of the method. Predicted results were able to clearly identify fish farms operating beyond ecologically sustainable carrying capacity. The proposed method has broad applicability and could help make decisions regarding the estimation of production potential of individual farms in pristine areas, for providing first estimates in sites that have scarce data, and for assessment, expansion, and optimization of the currently operating aquaculture sites in Southeast Asia, China and potentially other data-poor island nations. As the method relies on dynamic models, it enables straightforward assessments over the entire aquaculture region.  相似文献   

Using Assessment,Inventory, and Monitoring data for evaluating rangeland treatment effects in Northern New Mexico     

《Herpetological Monographs》2020,42(4):117-129

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Validating a Time Series of Annual Grass Percent Cover in the Sagebrush Ecosystem     

Stephen P. Boyte  Bruce K. Wylie  Donald J. Major 《Strength and Conditioning Journal》2019,72(2):347-359

We mapped yearly (2000–2016) estimates of annual grass percent cover for much of the sagebrush ecosystem of the western United States using remotely sensed, climate, and geophysical data in regression-tree models. Annual grasses senesce and cure by early summer and then become beds of fine fuel that easily ignite and spread fire through rangeland systems. Our annual maps estimate the extent of these fuels and can serve as a tool to assist land managers and scientists in understanding the ecosystem’s response to weather variations, disturbances, and management. Validating the time series of annual maps is important for determining the usefulness of the data. To validate these maps, we compare Bureau of Land Management Assessment Inventory and Monitoring (AIM) data to mapped estimates and use a leave-one-out spatial assessment technique that is effective for validating maps that cover broad geographical extents. We hypothesize that the time series of annual maps exhibits high spatiotemporal variability because precipitation is highly variable in arid and semiarid environments where sagebrush is native, and invasive annual grasses respond to precipitation. The remotely sensed data that help drive our regression-tree model effectively measures annual grasses’ response to precipitation. The mean absolute error (MAE) rate varied depending on the validation data and technique used for comparison. The AIM plot data and our maps had substantial spatial incongruence, but despite this, the MAE rate for the assessment equaled 12.62%. The leave-one-out accuracy assessment had an MAE of 8.43%. We quantified bias, and bias was more substantial at higher percent cover. These annual maps can help management identify actions that may alleviate the current cycle of invasive grasses because it enables the assessment of the variability of annual grass ? percent cover distribution through space and time, as part of dynamic systems rather than static systems.  相似文献