岷江上游汶川县耕地景观变化及空间驱动力

基于遥感影像和地理信息系统技术,应用景观指数和Kappa指数系列方法对岷江上游耕地景观变化进行研究,并引入二项Logistic逐步回归模型,选择海拔、坡度、坡向、到道路、河流和居民点距离为驱动因子对汶川县耕地景观变化的空间驱动力进行分析.结果表明: 研究期间耕地景观面积一直处于增长趋势,1974—1986年间耕地景观面积增幅最大.1986—2000年间耕地面积增加不明显,但是耕地景观与其它景观类型相互转换频繁,空间位置变化剧烈,特别是1994—2000年期间.耕地景观面积变化的驱动力主要为政策变化.耕地景观变化的空间驱动力在不同时间段内存在较大差异.     

福建平和果树冻害调查

本文分析了1999年12月福建平和出现严重冻害的气象特点,调查全县亚热带、热带果树的冻害情况及影响冻害程度的因素,并提出冻后的管理措施。     

Trade‐offs among agronomic,energetic, and environmental performance characteristics of corn and prairie bioenergy cropping systems

Cellulosic bioenergy production provides opportunities to utilize a range of cropping systems that can enhance the multifunctionality of agricultural landscapes. In a 9‐ha field experiment located on fertile land in Boone County, IA, USA, we directly compared a corn‐soybean rotation harvested for grain, continuous corn harvested for grain and stover, continuous corn harvested for grain and stover with a rye cover crop, newly reconstructed prairie harvested for biomass and fertilized with nitrogen, and unfertilized newly reconstructed prairie harvested for biomass. Comparisons were made using four performance indicators: harvestable yield, net energy balance (NEB), root production, and nutrient balances. We found trade‐offs among systems in terms of the measured performance indicators. Continuous corn systems were the highest yielding, averaging 13 Mg ha^?1 of harvested biomass (grain plus stover), whereas fertilized and unfertilized prairies produced the least harvested biomass at 8.8 and 6.5 Mg ha^?1, respectively. Mean NEBs were highest in continuous corn systems at 45.1 GJ ha^?1, intermediate in the corn‐soybean rotation at 28.6 GJ ha^?1, and lowest in fertilized and unfertilized prairies at 11.4 and 10.5 GJ ha^?1, respectively. Concomitant with the high yields of the continuous corn systems were the large nutrient requirements of these systems compared to the prairie systems. Continuous corn with rye required three times more nitrogen inputs than fertilized prairie. Root production, on the other hand, was on average seven times greater in the prairie systems than the annual crop systems. On highly fertile soils, corn‐based cropping systems are likely to play an important role in maintaining the high productivity of agricultural landscapes, but alternative cropping systems, such as prairies used for bioenergy production, can produce substantial yield, require minimal externally derived inputs, and can be incorporated into the landscape at strategic locations to maximize the production of other ecosystem services.     

Nobloedischia rasnitsyni, a new genus and species of Oedischiidae (Orthoptera) from the Lower Permian Wellington Formation of Oklahoma, USA

Nobloedischia rasnitsynigen. et sp. n. (Oedischiidae) is described from the Lower Permian Wellington Formation of Noble County, Oklahoma. The genus is similar to both Petrelcana (Oedischiidae: Mezenoedischiinae) and Oedischia (Oedischiidae: Oedischiinae) and is left unplaced at the subfamily level. The new species is the twelfth Orthoptera species and the fourth species of Oedischiidae from these deposits.     

澜沧药用植物资源研究

澜沧药用植物资源丰富。民族民间具有利用当地植物来防病治病的传统实践。本文选取澜沧县文东乡、东回乡、酒井乡作为调查研究对象,应用关键人物访谈、自由列举、参与式调查和相关文献查询等方法,对澜沧县各民族传统使用的药用植物资源进行调查研究。共收集到58种药用植物,分属35科55属,记录了58种药用植物中文名、拉丁名、药用部位、加工方法、主治（功效）等。分析了当地药用植物利用的知识和地方特点。     

亮花芒毛苣苔在中国的发现及近缘种花粉形态研究

该文报道了中国苦苣苔科(Gesneriaceae)植物分布新记录种,即亮花芒毛苣苔(Aeschynanthus fulgens Wall. exR. Br.),同时描述了该新记录种的分类学特征,并提供了该新记录种的引证标本和图片。此外,还比较了该新记录种与束花芒毛苣苔(A. hookeri C. B. Clarke)的花粉形态特征,发现二者花粉形态及纹饰存在显著差异。凭证标本保存在河南农业大学植物标本馆(HEAC)中。     

湖北兴山县种子植物区系特征与垂直分布格局研究

根据2016年-2017年对兴山县全域进行网格调查所获取的3450份野生种子植物标本, 结合相关标本馆馆藏标本数据, 对兴山县域种子植物区系特征与垂直分布格局进行了研究。结果显示, 兴山县共有野生种子植物145科705属1883种。在科级水平上主要以热带分布型为主, 共有63科, 占总科数的43.45%; 属级水平上温带分布型占据优势地位, 共有379属, 占总属数的53.76%。兴山县种子植物区系特征兼具有温带性质和热带亲缘, 过渡性特征明显, 区系成分复杂。种子植物在垂直分布上主要呈现为三大类: 在海拔100-1000 m范围内主要形成低山常绿落叶阔叶混交林; 在海拔1000-1900 m范围内以中山落叶阔叶林为主; 海拔1900-2500 m范围内形成亚高山灌丛。总体来看, 兴山县种子植物在海拔700-1300 m的中海拔地区物种最为丰富。     

陕西省植物分布新资料

报道了1个陕西省植物分布新记录属桑科(Moraceae)——水蛇麻属(Fatoua Gaudichaud-Beaupré)和3个新记录种——水蛇麻[Fatoua villosa (Thunberg) Nakai]、假鬃尾草(Leonurus chaituroides C.Y.Wu & H.W.Li)、羊乳[Codonopsis lanceolata (Siebold & Zuccarini) Trautvetter]。这3种植物的发现,对于补充完善陕西省植物资源,丰富陕西植物区系具有重要意义,同时也体现了金丝大峡谷植物类型在秦岭中的特殊性。     

中华鲱鲇年龄鉴定及生长特征

对2009-2010年采自澜沧江下游的188尾中华鲱鲇(Clupisoma sinensis)进行了年龄与生长的研究.采用耳石、脊椎骨、鳃盖骨、胸鳍棘4种材料对全部样本进行年龄鉴定,耳石年龄鉴定最为准确,4-5月是年轮形成高峰期.渔获种群由1-6龄共6个龄组组成,以1-4龄个体为主.体长与耳石半径呈线性函数关系.体长与...