当阳市地理坐标转换参数及估算方法研究

通过在Google Earth中采集公共点的WGS84经纬度坐标、在DRG上采集北京54和西安80平面坐标,本文采用布尔莎七参数模型,估算出当阳市WGS84转北京54、西安80坐标和北京54转西安80坐标的转换参数,并用公共点坐标和影像叠合两种方法进行了转换精度检验,结果表明：WGS84转北京54、西安80坐标的误差〈2．5m,北京54转西安80坐标的误差〈0．3m,能满足林业调查规划的精度要求,所求参数可以在林业调查规划中使用。     

中国长片叶蜂分类研究(膜翅目:蕨叶蜂科)

系统地研究了中国长片叶蜂属ＮｅｏｔｈｒｉｎａｘＥｎｓｌｉｎ的种类．记述４种,包括２新种：白端片叶蜂ＮｅｏｔｈｒｉｎａｘａｐｉｃａｌｉｓＷｅｉ,ｓｐ．ｎｏｖ．,凹鞘副片叶蜂ＮｅｏｔｈｒｉｎａｘｉｎｃｉｓｕｓＷｅｉ,ｓｐ．ｎｏｖ．．建立了１个新亚属：副片叶蜂亚属,Ｐａｒａｎｅｏｔｈｒｉｎａｘｓｕｂｇｅｎｎｏｖ．．大长片叶蜂ＮｅｏｔｈｒｉｎａｘｍａｊｏｒＭａｌａｉｓｅ是中国新记录种．编制了中国已知种类检索表．     

生态文明视域下草原治理体系构建研究

草原是我国面积最大的陆地生态系统,既是我国重要的生态安全屏障,也是广大农牧民赖以生存的家园。为深入贯彻习近平生态文明思想,落实山水林田湖草沙系统治理的理念,推进草原保护修复和高效利用,本研究结合十四五林业和草原保护发展规划纲要,提出了构建草原监测评价体系、草原保护体系、草原生态修复体系、草原执法监管体系、现代草业体系、支撑保障体系等草原治理体系,旨在为推进草原治理体系和治理能力现代化提供参考。     

银合欢落叶层对苗圃生长的森林一农田作物的他感作用(英文)

利用随机区组试验评估了孟加拉国吉大港大学苗圃内的银合欢落叶对森林作物种白格、黄金檀和农田作物种长豇豆、鹰嘴豆和木豆的他感作用。结果表明,凋落叶诱导抑制作物的萌发和生长,该抑制作用依赖于萃取物浓度、凋落物及受体物种类型。萃取物浓度越高则他感作用越强。受体植物的生长响应随应用的凋落叶而变化。低浓度(10g·m-2)凋落叶对农田作物嫩芽生长有促进作用,而其他浓度的凋落叶则呈现明显的抑制作用,施用的凋落叶浓度越大抑制作用也越大。但是不同处理所表现出的抑制趋势并不均一,根系生长受到的影响大于嫩芽。图3表4参34。     

吡啶甲酸铬安全性研究进展

吡啶甲酸铬作为有机铬添加剂，已成为普遍使用的铬营养补充物质。但目前尚未正式发布动物最低需要量和最高耐受量的具体数据。吡啶甲酸铬的安全性仍在研究探索之中，但得到的研究结果不尽一致。为此作者就吡啶甲酸铬的安全性研究及现有可能存在的代谢途径进行综述，以便为日后吡啶甲酸铬的研究提供理论基础。     

A spatial linkage between dams and non-native fish species in Hokkaido, Japan

Abstract –  The native and non-native freshwater fish species richness as well as the proportion of native fish species to overall fish species were examined to test a hypothesis of a spatial linkage between the distributions of dams and non-native fishes based on survey data collected in rivers and streams in Hokkaido, Japan. Non-native fish species have steadily increased in Hokkaido since the mid 1970s, as indicated by the decreasing proportion of native fish species per fish survey. Non-native species richness was significantly higher in areas above dams (i.e., reservoirs and their inlet streams) compared to areas without dams. As a result, the proportion of native fish species was lower above dams. This proportion was lower in developed and agricultural areas compared with forest areas, although both native and non-native species richness were higher in areas with development and agriculture. Non-native cyprinids, catfish and snakehead occurred primarily in a particular river basin with the largest drainage area, the longest history of reclamation and highest human population in the island. Non-native salmonids on the other hand, occurred in forest areas at higher elevations and their occurrence was associated with the existence of dams. There was a spatial linkage between the distribution of dams and non-native species, although it was applicable only to salmonids. The management of dams and reservoirs needs a strategy to prevent further expansion of exotic salmonids such as rainbow and brown trout. These species can be a significant threat to native Japanese salmonids as a result of various biological mechanisms.     

大面积用材林代化栽培模式技术

林业生产要达到当今经济技术条件下最大限度的速生、丰产、优质、高效稳定和持续，不仅要有良种壮苗，还要做好造林地调查与规划，做到适地适树、适时适法，这是实现林业优化栽培模式的前提与保证；同时，造林树种选择、造林时间、密度确定、种植点配置、栽培方法、林木施肥、营造混交林以及森林保护、造林地设保护带、造林地留栽补植苗，这一系列均是用材林优化栽培模式的重要技术措施。     

Perch (Perca fluviatilis) as an indicator species for structural degradation in regulated rivers and canals in the lowlands of Germany

Abstract— Simple morphological characteristics and fish assemblage data were collected in representative numbers from 12 inland waterways in the northeastern lowlands of Germany between 1992 and 1995. Fish abundance data were pooled and classified into three main groups: perch Perca fluviatilis (L.), roach Rutilus rutilus (L.) and other species. Spearman rank correlations between fish abundance and type of embankment revealed that perch showed a statistically significant numerical dominance in waterways consisting predominately of an artificial shoreline, suggesting that perch may be used as an indicator of the structural degradation of watercourses.     

Two New Genera and Species of Blennocampinae from Sichuan and Yunnan (Hymenoptera:Blennocampidae)

本文记述川滇地区蔺叶蜂科蔺叶蜂亚科两新属新种：亮背卜氏叶蜂Ｂｕａｍｅｔａｌｉｃａｇｅｎ．ｅｔｓｐ．ｎｏｖ．新属新种，红胸滇片叶蜂Ｄｉａｎｓｔｅｔｈｕｓｒｕｆｉｔｈｏｒａｃｉｃｕｓｇｅｎ．ｅｔｓｐ．ｎｏｖ．新属新种，两新属均隶属于等节叶蜂族Ｐｈｙｍａｔｏｃｅｒｉｎｉ．卜氏叶蜂属与ＰｈｙｍａｔｏｃｅｒｏｐｓｉｓＲｏｈｗｅｒ和ＤｉｃｒｏｓｔｅｍａＢｅｎｓｏｎ二属近似，区别为：新属虫体瘦长，前胸背板侧叶无斜脊前沟，前翅２Ｒｓ室长于１Ｒ１和１Ｒｓ室之和，后翅臀室具长柄，锯背片无节缝刺列．此外，新属与Ｄｉｃｒｏｓｔｅｍａ的区别还有２Ａ＋３Ａ脉端部上曲，颚眼距较狭窄；与Ｐｈｙｍａｔｏｃｅｒｏｐｓｉｓ的区别还有后翅Ｍ室封闭，唇基端部截形．滇片叶蜂属与ＰｈｙｍａｔｏｃｅｒｏｐｓｉｓＲｏｈｗｅｒ最接近，其区别为新属爪具显著基片、后颊脊缺、后翅具封闭的Ｍ室和锯背片具节缝刺等．