Effect of prebiotic xylooligosaccharides on growth performances and digestive enzyme activities of allogynogenetic crucian carp (<Emphasis Type="Italic">Carassius auratus gibelio</Emphasis>)

The effect of prebiotic xylooligosaccharides (XOS) on the growth performance and digestive enzyme activities of the allogynogenetic crucian carp, Carassius auratus gibelio, was investigated. XOS was added to fish basal semi-purified diets at three concentrations by dry feed weight: diet 1, 50 mg kg⁻¹; diet 2, 100 mg kg⁻¹; diet 3, 200 mg kg⁻¹, respectively. Twelve aquaria (n = 20) with three replicates for each treatment group (diets 1–3) and control treated without XOS were used. Weights of all collected carp from each aquarium were determined at the initial phase and at the end of the experiment, and the carp survival was also determined by counting the individuals in each aquarium. After 45 days, there were significant differences (P < 0.05) in the relative gain rate (RGR), and daily weight gain (DWG) of diets 1–3 were compared with the control. However, the survival rate was not affected (P > 0.05) by the dietary treatments. For enzymatic analysis, dissection produced a crude mixture of intestine and hepatopancreas of each segment to measure. The protease activity in the intestine and hepatopancreas content of fish in diet 2 (487.37 ± 20.58 U g⁻¹ and 20.52 ± 1.93 U g⁻¹) were significantly different (P < 0.05) from that in the control (428.13 ± 23.26 U g⁻¹ and 12.81 ± 1.52 U g⁻¹) and diet 3 (428.00 ± 23.78 U g⁻¹ and 14.04 ± 1.59 U g⁻¹). Amylase activity in the intestine was significantly higher for diet 2 compared to diet 1 and the control. As for amylase in the hepatopancreas, assays showed higher activity in diet 2 (P < 0.05) compared to the rest.     

关于农业面源污染治理的实践与思考——以云和县治水为例

总结云和县农业面源污染治理的成效与做法,分析存在的问题,并提出进一步推进农业面源污染治理的建议。     

鲜食早熟葡萄醉金香在宁波市鄞州区的引种表现及高效栽培技术

基于鄞州区鲜食优质早熟葡萄醉金香引种试验,介绍了鲜食早熟葡萄醉金香及对照品种鄞红葡萄的引种表现,总结了其高效栽培技术,以期为该地区的葡萄种植提供参考。     

建瓯市毛竹林土壤养分状况及丰缺分级

采集了福建省建瓯全市15个乡镇毛竹(Phyllostachys heterocycla cv.pubescens)林表层土壤,对其养分含量进行了测试分析,在此基础上对毛竹林土壤养分含量进行了丰缺分级.结果表明:建瓯市毛竹林土壤较为肥沃,土壤酸碱性适宜毛竹生产;表层土壤有机质含量为较高,为3.98％;全氮平均含量为1.48 g/kg,碱解氮平均含量为167 mg/kg,土壤供氮较为充足;有效磷含量为9.93 mg/kg,远低于毛竹生长所需;速效钾含量为55.4 mg/kg,稍低于毛竹正常生长所需;土壤中量元素钙、镁含量普遍较低.整个建瓯市毛竹林土壤养分存在富氮低磷缺钾的现象,同时缺乏供应中量元素养分的能力,不同乡镇间毛竹林土壤养分失调的种类及程度有较大的变化.     

浙江省磐安县香榧种质资源调查

磐安县香榧栽培历史悠久,资源丰富。2002年和2003年6—10月,作者对磐安县香榧的种质资源及自然分布进行了调查,将全县香榧的品种类型资源分成长榧类、圆榧类两大类,主要有细榧、大香榧、丁香榧、獠牙榧、大圆榧、中圆榧、小圆榧7个品种(或类型),主栽品种是细榧,其余属自然类型;论述了几个主要品种(或类型)的经济性状,同时提出了加强对磐安县香榧种质资源保护,大力发展、推广细榧这个优质品种,合理开发利用其它自然类型等发掘利用建议。     

35kV小型化模式变电所优化组合的研究与应用

通过两种“小型化模式变电所”接线的优化组合，对主开关部件加以研究改造，使其能适合于既有供电用户又有小水电上网负荷区域运行的３５ｋＶ小型化全户外式变电所，在浙江省余姚市梨洲获得成功。在减少投资、节约土地、缩短周期、降低运行费用等方面效益显著。     

日本黄姑鱼食品加工工艺的初探

本文描述了舟山市当地渔民加工制作日本黄姑鱼鱼片的工艺流程,并利用酒糟法、烤片法以及烟熏法三种加工工艺改善日本黄姑鱼的肉质与口味,通过这些工艺加工后的日本黄姑鱼片具有肉质紧凑,香味独具的特点。文中同时探讨了三种加工工艺的可行性,旨在改进日本黄姑鱼的食用与加工方法,从而更有利于消费者接受与品尝日本黄姑鱼。     

浙江省农村水污染成因与防治对策探讨

浙江省地表水受污染的影响因素多,城镇生活污水和工业废水排放及农村面源污染均造成了较严重的水环境污染。为此,对浙江省农村水污染治理对策进行了探索,旨在通过加强农村生态环境建设、发展污水重复利用等措施改善农村水生生态环境,为经济的可持续发展提供保障。     

The contribution of Asian dust in the pedogenesis of ultisols in Southeastern China determined by soil grain size

Journal of Soils and Sediments - The present study was conducted to understand the pedogenesis of soils developed on basalts and reveal the impact of Asian dust on soils in subtropical China. Soils...