湖南省野生葡萄资源调查

湖南野生葡萄资源,主要分布在湘西、湘西南、湘中地区海拔700m以下的山坡地,湘东、湘北、湘南一些县、市亦有零星分布。全省野生葡萄隶属葡萄科4属17种和1个变种。本文简要介绍13个种(包括1个变种)的生物学特性及植物学性状。     

南阳牛遗传资源普查现状及其发展前景

南阳牛原产于河南省西南部南阳盆地,主要分部在南阳市宛城、卧龙、新野、镇平、方城、桐柏、邓州市、唐河8个县市区。本文以南阳牛为研究对象,综述了南阳牛遗传资源普查的现状和南阳牛产业发展的前景,提出了当前一个时期发展的重要任务。     

Drift diving: A quick and accurate method for assessment of anadromous salmonid spawning populations

The accuracy of drift diving surveys of Atlantic salmon, Salmo salar L. and sea trout, Salmo trutta L., was evaluated by comparing the abundance and size distribution with catches in a fish trap over 6 years in the River Etneelva, western Norway. The population count from drift diving accounted for on average 96.3% of the salmon in the trap after accounting for the catches during fishing. Size structure registered during drift diving corresponded with trap catches of salmon, but the number of small salmon (<3 kg) appeared to be somewhat underestimated, while large salmon (>7 kg) were overestimated in drift diving. For sea trout, the match between drift diving counts and trap registrations was poorer (average 76.3%), but may have been affected by the surveys being performed too late with regards to sea trout spawning time. The study illustrates the utility of drift counting for estimating the entire population of anadromous salmonids in a river.     

基于Census X12和HP滤波的海南蔬菜价格波动特征及原因分析

以海南省主要蔬菜品种2012年1月至2015年9月的月零售价格为研究对象,采用Census X12季节调整方法,把季节变动S分离出来,分析海南省各类蔬菜价格的季节性波动情况,进一步采用HP滤波法将趋势变动T、循环变动 C分离出来,分析海南省各类蔬菜价格的趋势和循环波动情况。然后对海南省蔬菜价格波动原因进行分析。     

河北省沧洲市园林绿化树种调查与树种选择

二次赴重盐碱地城市沧州市进行绿化树种调查，共调查树木１３４７株，分属２１科４７属。分析调查结果，并据沧州市的自然概况，选择沧州市的基调树种和各类型绿地的骨干树种。     

长沙县农户经营模式的调查与思考

从长沙县农户经营模式的现状出发，综观国内外农户经营的发展趋势和中国实现农业现代化的要求，论证了积极推进农户适度经营的根据和对策．     

Detection of protection benefits for predatory fishes depends on census methodology

1. Marine protected areas (MPAs) are used as fisheries management and conservation tools. Well-enforced no-take zones allow the rebuilding of natural populations of exploited species; however, there is still controversy on the role of buffer zones.
2. The effectiveness of MPAs could be underestimated, as fish population assessments depend largely on traditional methodologies that have difficulties in detecting predatory fish because of their low abundances, their patchy distribution, and their reaction to the presence of divers.
3. The performance of different census methods was compared in assessing the protection benefits for large predatory fishes under different protection levels (i.e. no-take and buffer zones) in five Mediterranean MPAs. Specifically, conventional strip transects (CSTs, 50 × 5 m²) and tracked roaming transects combined with distance sampling (TRT + DS, variable lengths) were compared, including a series of TRT-derived estimators with variable transect lengths and fixed widths of 20, 10, and 6 m (TRT20, TRT10, and TRT6, respectively). Additionally, the effectiveness of the MPAs studied and protection levels for conserving large predatory species was evaluated.
4. Transects covering larger areas (i.e. TRT + DS and TRT20) allowed the detection of a greater number of species and yielded more accurate estimates of density and biomass than transects of narrower fixed widths, particularly the CSTs, which were associated with the lowest richness detection capability, accuracy, and precision. On average, both no-take zones and buffer zones appeared effective for the conservation of predatory fishes, indicating that multiple protection areas were ecologically effective. Differences between MPAs were also observed, however, probably arising from both local environmental and management factors.
5. We suggest the implementation of methodologies with larger transects for the study of large predatory fish, combined with CSTs for the rest of the fish community, in order to avoid biases in predatory population assessments, which are key indicators of MPA effectiveness.

     

高山峡谷地区土地资源卫星遥感技术研究

采用卫星磁带计算机处理,航、卫片结合调查,不同比例尺嵌合成图和简化的净耕地系数综合区划取样法,线状地物调左的镜测及数学模型修正,农村居民点分区多点抽样测量等新技术和新方法可解决高山峡谷地区土地资源调查中的技术难题.     

Influences on the Distribution of Marine Debris on the Seafloor of Shallow Coastal Areas in Greece (Eastern Mediterranean)

The abundance and composition of marine benthic debris was investigated in shallow coastal areas of Greece (eastern Mediterranean). The mean total density of marine debris in the areas surveyed was 15 items per 1000 m² and ranged from 0 to 251 items per 1000 m², with plastics dominating. Much higher marine debris densities were found in this study than those found in most studies surveying the continental shelf or the deep seafloor, indicating that pollution with marine debris is more intense in coastal areas. Greater abundance of marine debris was found in bays than in open areas. Artisanal fishing activities were found to significantly contribute to marine pollution with debris. In the Saronicos Gulf, a densely populated and highly industrialized area, the abundance of marine debris was higher than the rest of the Greek areas surveyed.     

一个种猪场猪伪狂犬病疫情四年追踪调查报告

对某中型集约化种猪场４年继发猪伪狂犬病疫情进行了追踪调查。疫病流行于带仔母猪舍，主要是７￣１２日龄仔猪发病，１９９４年暴发流行时，窝发病率为４３．７％，发病窝仔猪发病率为８６．７％，病死率为９３％。疫情平息后，对全场经产母猪接种过伪狂犬病疫苗。１９９５￣１９９７年在带仔母猪舍又继发流行，窝发病率分别为３２％，３４％和２９％，其发病窝仔猪发病率和病死率较首发时低。