华北地区香菇市场的供求分析

面对蔬菜消费结构的高级化,探讨喜凉性香菇的时序供应规律与经济特征,对市场有效组织与生产技术创新具有重要作用。以北京典型批发市场为代表,采集香菇2005年-2008年日交易量、价格与日交易额等资料,研究华北温带地区香菇的供求状况。结果表明,华北香菇市场周年交易量存在明显的冬春供应旺季与夏秋供应淡季的周年变化和＂大小年＂趋势,季节差价45.23%-52.35%。华北地区香菇市场季节间价格周年变化相对均衡,面对淡季的香菇生产,降低成本与产业化市场组织成为提高经济效益的主要途径。     

菜区趋光性昆虫物种多样性与季节动态分析

菜区趋光性昆虫包含10目47173 ，以鳞翅目和鞘翅目的数量最大，分别占总类数的54．33％和28．81％。3月中旬－5月上旬．10月上旬－12月中旬间物种数出现两个高峰，且后者明显高于前者。物种多相关性一在4月上旬－5月上旬、9月份、11月下旬－翌年1月份较高，其变化同物种数和个体数量有关。不同季节均以鞘翅目、同翅目和鳞翅目优势集中性较高。     

白菜不同基因型硝酸盐含量差异的研究

 春夏秋冬不同季节的46 个白菜基因型的硝酸盐含量存在显著差异; 经聚类分析将其划分为高硝酸盐含量和低硝酸盐含量的品种群; 同一品种在不同季节栽培, 硝酸盐含量有一定变化, 一般秋冬季低于春夏季。     

多效降温反季节菇田栽培食用菌效果对比试验

针对广东省漫长的高温季节进行了人工低能耗降温试验，采用超高压微量喷雾、山水沟灌、棚顶滴流、增设隔热层等多效降温措施，使大棚式菇田内外温差在高温天气下达到5～7℃，使杏鲍菇、香菇、猴头菇、秀珍菇等中低温型食用菌品种可以在夏季正常出菇。为非空调制冷条件下延长广东的食用菌生产季节提供了有效的方法，其低廉的能耗成本为农村的推广创造了条件。     

Effects of recombinant bovine somatotropin (rbST) and season on plasma and milk insulin-like growth factors I (IGF-I) and II (IGF-II) in lactating dairy cows

During two studies, effects of recombinant bovine somatotropin (rbST) on plasma and milk IGF's in cows adapted to summer (S; 12 cows) or winter (W; 12 cows) conditions were evaluated. Each study consisted of on-farm periods (30 days) followed by climatology chamber periods (CC; 30 days). Cows were given daily injections of rbST, Sometribove, USAN (25mg/day; 6 cows each study) or saline (control; 6 cows each study). During on-farm periods, blood and milk (am and pm) samples were collected once weekly. During CC periods, blood samples were collected every 2 days and milk samples (am and pm) were collected daily. Plasma IGF-I and IGF-II were increased in cows treated with rbST. A pronounced seasonal pattern in basal and rbST-stimulated plasma IGF-I but not IGF-II was detected. Higher basal and rbST-stimulated plasma IGF-I concentrations in S occurred despite large decreases in feed intake and energy balance. Milk IGF-I and IGF-II was not affected by rbST treatment or season. Although milk IGF-I and IGF-II concentrations were unaffected by rbST treatment, total IGF-output increased due to increased milk yield. The observed seasonal patterns in plasma IGF-I may be indicative of seasonal differences in the coupling of the somatotropin-IGF axis. In particular, we failed to detect an uncoupling of the somatotropin-IGF-I axis in S despite an induced negative energy balance during thermal stress.     

The epidemiology of paramphistomosis of sheep (<Emphasis Type="Italic">Ovis aries</Emphasis> L.) in the north west temperate Himalayan region of India

An epidemiological study with the objective to assess the prevalence of paramphistomosis in association with season, age, sex and breed was carried out in naturally infected sheep over a period of two years from February 2005 to January 2007. Gastrointestinal tract (GIT) and faecal examination were conducted monthly to monitor the seasonal occurrence of paramphistomosis. 793 sheep were examined in the first year, out of which 7.06% were positive for Paramphistomum infection. In the second year, 740 animals were investigated and 7.7% were infected. The overall prevalence of paramphistomosis was 7.3% with a mean of 56.50 ± 0.50 and 95% confidence interval (CI) (lower bound: 50.1469; upper bound: 62.8531). The prevalence of paramphistomosis through GIT examination (P = 0.593) was 7.6% at 95% CI (lower bound: −19.1186; upper bound: 57.1186) and the prevalence through faecal examination (P = 0.884) was 7.2% at 95% CI (lower bound: 5.7345; upper bound: 69.2655). Generally, season and age were the factors found to have a significant influence on the risk of paramphistomosis in sheep. The highest infection was found in the summer season (P < 0.005); lower age groups (P < 0.005) in males and in migratory (Bhakarwal) breed (P ≥ 0.005). Winter, adult animals, females and local breed reported low infection. The present study will be of great significance to understand the epidemiology of gastrointestinal helminthes of sheep initially in the resource poor communities of Himalayan region and will definitely be helpful to devise appropriate control strategies for paramphistomosis.     

感温型杂交籼稻新组合在桂南晚季区试的表现

为了推荐综合性状较优并能充分利用桂南光温资源的杂交稻品种,对9个感温型杂交籼稻新组合（含对照）进行完全随机区组小区试验,通过方差分析、排序比较,评鉴这些组合在桂南生态区晚季的特征特性。结果表明,‘深两优9353’、‘昌两优华占’、‘昌两优9号’、‘乾两优9号’、‘坤两优华占’、‘乾两优6号’产量、全生育期和抗性表现较适合桂南生态区。‘深两优9353’产量最高且显著高于对照组合;‘F优6735’和‘万泰香占’虽然抗性好,但是产量极显著或显著低于其他组合（含对照）。参试组合的产量与全生育期、总粒数、实粒数的相关性较好,而与其他性状相关性较差。6个感温型苗头组合利于充分利用桂南光温资源、发展冬种生产、调整产业结构,可作为桂南生态区早晚两季水稻生产备选组合。     

茶树鲜叶含硒量影响因素分析

对福建三茶区茶树鲜叶含硒量的影响因素研究结果表明,不同类型土壤中的有效态硒含量是影响茶叶含硒量的主要因素,两者间呈显著正相关,同一品种在不同土壤上种植,由于土壤中的有效态硒含量不同,茶树鲜叶含硒量竟相差１１倍（黄品种）和１８倍（水仙品种）;其次是茶树品种间的差异,在同一立地条件下,不同茶树品种的鲜叶含硒量高低相差近４倍;第三是季节间的差异,茶树鲜叶含硒量表现为头、四茶显著高于二、三茶,高低相差为２倍左右。茶叶加工过程对茶叶含硒量没有影响。     

南京市莫愁湖公园观赏植物资源调查

2008年3月～10月对南京市莫愁湖公园植物多样性进行调查,并对观赏性植物进行分析研究。结果显示,莫愁湖公园现有陆生植物共81科193属235种,种类优势科为蔷薇科,数量优势种有木本海棠、荷花、构树、樟树等。园中观赏植物基本符合园林植物栽种的基本规律。调查研究建议,莫愁湖公园的植物分布仍然需要注重植物的垂直分布以增加空间的有效利用,注重季节性景观的营造;对占公园总面积一半的湖面也需要进一步地进行资源开发,同时要研究植物之间的相互作用以及园林病虫害的预防。