发酵床垫料水分调控系统设计

为解决发酵床垫料部分区域积水导致的烂床等问题,试验确定了＆quot;热气脉动法＆quot;的垫料水分调控方法,并设计了一套发酵床垫料水分调控设施设备以 STC89C52单片机为核心,WL433A无线通讯模块进行数据的传输,使用 VB.NET进行上位机的开发, Access为后台数据库,实现了对发酵床垫料内部信息的实时采集、无线传输、自动存储以及远程实时监测等,为发酵床垫料水分调控的研究提供了设施基础,在一定程度上推动了养殖设施设备的发展。     

Effects of Various Degrees of Antennal Ablation on Mating and Oviposition Preferences of the Diamondback Moth,Plutella xylostella L.

Using scanning electron microscopy, we investigated the distribution of the trichoid, basiconic, and coeloconic sensilla on the antennae of the diamondback moth （DBM;Plutella xylostella）. The trichoid sensilla were the most abundant sensory organ, and the male moth antennae host signiifcantly more trichoid sensilla than female moth antennae. Conversely, basiconic and coeloconic sensilla were found more frequently on female than on male antennae. We performed experiments with various degrees of antennal ablation and demonstrated that DBM antennae played a key role in the control of mating and oviposition. We found that neither oviposition preference nor mating behaviors changed signiifcantly when less than 1/4 of both antennae were removed. However, there was a signiifcant behavioral change when the antennae were ablated by more than half. As the length of the antenna was shortened, the successful mating rate decreased and mating peak was delayed. An otherwise consistent host preference for oviposition was eliminated when both antennae were completely removed. Furthermore, we found that the number of trichoid sensilla was positively correlated with mating rate and oviposition preference. However, the numbers of basiconic and coeloconic sensilla were not correlated with mating rate and mating peak, but highly correlated with oviposition preference. Taken together, our results indicate that antennal sensory information plays a critical role in the mating and oviposition behaviors of this economically important pest.     

中德造林项目中经济林项目实施存在的问题与对策

阐述了中德财政合作湖南小农户造林项目中经济林项目的实施情况,指出了发展经济林的过程中存在的主要问题,提出了相应的解决问题的建议。     

正交试验优化红豆杉硒多糖的提取

以恩施高硒地区的珍贵药用植物红豆杉为研究对象,以料液比、水浴浸提时间以及微波处理时间为试验因素设计正交试验,优化了红豆杉硒多糖的提取分离纯化工艺.通过硫酸苯酚法测定红豆杉中硒多糖的含量,采用原子荧光法测定硒多糖中硒的含量,并以SPSS统计软件对正交试验结果进行处理和分析.结果表明,3因素对硒多糖提取率影响大小为料液比＞微波处理时间＞水提时间,且红豆杉中硒多糖的最佳提取条件为料液比1∶80(W/V)、水浴浸提时间30 min、微波处理时间5 min.在此条件下,测得红豆杉中硒多糖含量为1.96％,硒多糖中硒含量为0.0555 μg/g.     

香蕉掉蕾原因调查与分析

研究香蕉田间掉蕾规律及发生影响因素,为合理降低香蕉掉蕾率提供科学依据.以威廉斯B6为试材,采用田间调查和室内解剖分析的方法,对香蕉掉蕾规律和果轴形态进行分析.结果表明香蕉掉蕾与母株前期自身长势及生长特性无关,而与抽蕾期果轴发育过程中的变形密切相关.未掉蕾植株的果轴呈自然下垂状,掉蕾植株果轴多数呈异常弯曲状.果穗第1张苞叶展开处出现的弯曲会增加果穗对果轴基部支撑点的力矩,进而诱发掉蕾.抽蕾期作为预防掉蕾的关键时期,应注意采取措施减少果轴弯曲而导致掉蕾.     

基于K_means硬聚类算法的葡萄病害彩色图像分割方法

为了提高植物病害图像的分割精度与效果,根据植物病害症状及图像的特点,提出了一种基于K_means硬聚类算法（HCM）的葡萄病害彩色图像非监督性分割处理方法。该方法是在L*a*b*颜色空间模式下利用ab二维数据空间的颜色差异,以平方欧式距离作为像素间的相似度距离、以均方差作为聚类准则函数对颜色进行二分类聚类,并通过数学形态学运算对聚类结果进行校正。利用该方法对3种葡萄病害彩色图像进行分割的结果表明,该方法能够较为准确地将病斑区域从彩色图像中分割出来,对葡萄病害彩色图像的分割处理比较理想,鲁棒性好,分割准确率     

A Study on Seedlings'''' Density of Aralia elata

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Ecology habits ofEquus hemionus andGazella subgutturosa in Kalamaili Ungulate Reserve in autumn

The food habits of Wild ass (Equus hemionus) and Goitred gazelle (Gazella subgutturosa) in kalamaili Ungulate Reserve in autumn was described, based on the investigation conducted in 1992. Wild ass was much concentrated around water sources, and had more food resource than Goitred gezelle. The quagmires in the reserve were critical conditions as food and water bases for both species. In terms of present survey, it was estimated that 680 Wild ass and 8840 Goitred gazelle lived in this reserve. (Responsible Editor: Zhu Hong)     

退化羊草草地生态恢复技术的研究

在内蒙古锡林郭勒盟东乌珠穆沁旗对退化羊草草地进行了更新复壮的技术研究,初步探索出了退化羊草草地生态恢复技术和群落演替规律。