落叶果树叶片营养模糊诊断法研究

研究提出了落叶果树“低量、适量、过量”叶片不同营养状态的隶属函数,定义出散温化语气算子和判定化语气算子,以最大隶属度原则为依据,建立了落叶果树营养诊断的模糊模型和用于,苹果,梨诊断的有关参数,计算分析表明,在用于桃,葡萄等树种时,对有关参数进行修正,此模糊诊断模型适用于落叶果树的营养诊断。     

外源海藻糖调节西瓜细胞渗透胁迫抗性的研究

为探究外源海藻糖对渗透胁迫下西瓜细胞生长的影响,本研究以西瓜悬浮培养细胞为试材,测定外源海藻糖预处理后,渗透胁迫对西瓜悬浮培养细胞生长量、细胞外pH、细胞内ROS（活性氧簇）相对含量和微管骨架的影响。结果表明：渗透胁迫下西瓜细胞的生长量明显受到抑制,并且渗透胁迫可诱导西瓜悬浮培养细胞质外体碱化,ROS迸发,细胞微管骨架发生解聚;外源添加海藻糖可在一定程度上缓解渗透胁迫对西瓜悬浮细胞生长量的抑制作用,调节pH、ROS表达水平、并维持微管骨架结构的完整性。以上研究结果表明渗透胁迫下,海藻糖对西瓜细胞具有维持细胞生长、保护亚细胞结构并调节抗性反应的功能。     

Injury to apples and peaches at harvest from feeding by Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) nymphs early and late in the season

Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) is an invasive species that has become an important orchard pest in the Mid-Atlantic region of the US. Adults and nymphs feed on tree fruit. Feeding injury from adults has been characterized but the injury from nymphs has not been examined systematically. Since the four plant-feeding instars of H. halys (second through fifth) differ substantially in size, it is plausible that the effects of their feeding on fruit injury and injury expression may differ among them. We compared feeding injury at harvest from young nymphs (second plus third instars), older nymphs (fourth plus fifth instars), and adults that were caged on ‘Smoothee Golden’ apples and ‘Redhaven’ peaches in early June (peach and apple), late July (peach), and late August (apple). Individual apples and peaches were caged at fruit set and assigned to the following treatments (n = 28/treatment): 1) control (no H. halys), 2) young nymphs or 3) adults early in the season, and 4) young nymphs, 5) older nymphs or 6) adults later in the season. Fruit in each treatment were exposed to 3–4 young nymphs, two older nymphs or 1–2 adults placed in the cages for 96 h and evaluated for external and internal feeding injury within 36 h after harvest. No injury was recorded from unexposed peaches or apples. The percentage of injured fruit and number of injuries per fruit varied significantly among the exposed treatments. Early season feeding by young nymphs yielded the least injury to peaches and apples. In apples, the highest percentage of injured fruit and number of injuries per fruit were caused by late season feeding by adults. In peaches, early season adult feeding produced the highest percentage of injured fruit and injuries per fruit. More internal than external injury was recorded on peach and no such difference was observed on apple. The implications of these findings on H. halys management in fruit orchards are discussed.     

石阡\"多能高效\"沼气池型的特点与应用效果

从石阡县沼气池型的演变探讨该县区域群众满意的推广池型,对加快沼气建设步伐,减少森林砍伐,解决群众生活用能,推动“三沼”利用有极大作用。达到保护森林植被,改变生态环境,提高生活质量,实现生态效益和经济效益双赢。     

区域和立地类型对混交林生长的影响

混交林在不同立地类型条件下 ,有不同的生长表现 ,通常以北坡、坡度 10°以下、山下腹、土层厚 >30cm的立地类型较好。辽东区域的林分乔木层生物生产力 ,比辽西和辽南区域提高32 %～ 58% ,混交林生物生产量随年龄增长呈递增趋势 ,生物生产力呈递减趋势。混交林生物生产力与水、热关系明显 ,当年降水量 >70 0mm ,且年均气温在 5～ 8℃时出现正效应     

Differences in spectral trajectory with stand volume development between Japanese larch and Japanese oak in Hokkaido,Japan

Our objective was to investigate the differences in the spectral trajectory of the LANDSAT Thematic Mapper with stand volume development between Japanese larch (Larix kaempferi) and Japanese oak (Quercus mongolica var. crispula) in the experimental forest of Kyushu University, Hokkaido, Japan. We used nonlinear regression and a categorical variable to investigate the relationship between spectral reflectance factor and stand volume for each forest type. This research showed that the reflectance factor of Japanese larch and Japanese oak reached saturation and that both forest types had different spectral trajectories with stand development. In addition, we found that middle of development stage (stand volume was between 100 and 200 m³/ha) of each forest type had similarity in reflectance factor.     

浅谈沥青混合料搅拌设备选型问题

通过对目前各种沥青搅拌设备性能的比较和分析,确认设备选型的方法。