天星桥小流域水土流失治理生态效益初析

对赤水河流域天星桥小流域实施的水土保持生态环境建设工程进行了生态效益的监测分析。结果表明：进行水土流失治理使该小流域内水土流失得到了明显的控制,提高了森林覆盖率,改善了生态环境,并且改善了流域内农户的生活、生产条件,提高了农民收入。     

一例肺炎克雷伯氏菌引起山羊死亡诊断报告

从出血羊肺中分离出的1株菌,对该菌进行形态鉴定、16s r RNA测序、致病性试验和药物敏感性试验,鉴定为肺炎克雷伯氏菌。该菌除对孢曲松高度敏感和对环丙沙星等5种药物中度敏感外,对强力霉素等4种药物不敏感;此外,该菌能使小鼠死亡。结果表明,该例山羊死亡是由肺炎克雷伯氏菌引起的,经过用药进行防治,其他山羊未发生死亡。     

海岛棉品系海1无腺体性状的遗传——Ⅱ.陆地棉遗传背景的近等…

研究了显性无腺体基因在３种不同的遗传背景上对棉花农艺性状的影响。结果表明：显性无侏体基因对棉花的产量、纤维长度和种仁营养品质等主要性状均无明显影响。但皮棉产量有下降，纤维长度有伸长的趋势。     

切割稻秸发酵产沼气性能影响因素优化

为了替代秸秆沼气湿式发酵的需进行粉碎预处理,探索切割颗粒秸秆的发酵工艺,简化工程操作流程,降低能耗。该文以稻秸为研究对象,研究发酵温度、发酵液浓度、稻秸粒度和堆沤时间对产气性能的影响,并进行试验验证。结果表明:温度与原料挥发性固体(volatile solid,VS)产气率的相关性显著(P0.01),最优组合为:40℃、堆沤2 d、粒度1 cm、总固体(total solid,TS)质量分数为8%,最优组合VS产气率为385.9 mL/g;40℃厌氧消化产沼气的速率快,各试验组前20 d累积产气量都达到总产气量的73%以上;正交试验中,40℃试验组均有发酵液温度高于水浴锅现象,以及生化培养箱验证试验组发酵液温度高于对照,2种现象说明水稻秸秆厌氧消化可能有少量放热。研究结果为秸秆沼气工程发酵工艺改进和运行提供参考。     

Effects of Compound Bacteria Preparation on Fermentation Quality and Rumen Fermentation Characteristics of Phragmites australis Silage北大核心CSCD

The purpose of this study was to investigate the effects of compound bacteria preparation (including homogeneous Lactobacillus/heterogeneous Lactobacillus, Bacillus subtilis and Aspergillus niger as well as their compatibility) on nutrient composition, fermentation quality and rumen fermentation characteristics of Phragmites australis silage. Taking growing Phragmites australis from Dongting lake as silage material, five groups were set up, which were blank group (CK group), lactic acid bacteria group (LA group, supplemented with Lactobacillus plantarum, Pediococcus pentosaceus and Lactobacillus buchneri), lactic acid bacteria+Bacillus subtilis group (LA+BS group), lactic acid bacteria+Aspergillus niger group (LA+AN group) and lactic acid bacteria+Bacillus subtilis+Aspergillus niger group (LA+BS+AN group), and each group had 3 replicates. The supplemental level of lactic acid bacteria was 1.5×108 CFU/kg silage raw materials, and the supplemental levels of Aspergillus niger and Bacillus subtilis were 1.0×108 CFU/kg silage raw materials (all were based on fresh weight of silage raw materials). After 60 days of silage, the nutrient composition and fermentation quality of Phragmites australis silage were determined, and the rumen fermentation characteristics were evaluated by in vitro fermentation and in vivo degradation. The results showed as follows: 1) the contents of dry matter and ash in LA, LA+BS and LA+AN groups were significantly lower than those in CK group (P<0.05), and the crude protein content in LA+BS, LA+AN and LA+BS+AN groups was significantly higher than that in CK and LA groups (P<0.05). 2) The silage sensory evaluation scores of all groups were 60 to 70 points, and the ratings were good. The comprehensive scores of fermentation quality in LA+BS and LA+AN groups were higher, among which, the ammonia nitrogen to total nitrogen ratio, acetic acid content and acetic acid to total acid ratio in LA+AN group were significantly decreased compared with CK group (P<0.05), while the lactic acid content and lactic acid to total acid ratio were significantly increased compared with CK group (P<0.05). 3) The dry matter disappearance rate and total gas production of in vitro fermentation in LA+AN group were significantly higher than those in the other groups (P<0.05), and in vitro fermentation parameters such as volatile fatty acid contents in fermentation liquid were improved. 4) The rumen fermentation dry matter degradation rate in LA+AN and LA+BS+AN groups at 8, 24 and 48 h was significantly higher than that in the other three groups (P<0.05). In conclusion, the combined application of lactic acid bacteria and Aspergillus niger with supplemental levels in this experiment has the best effect on the quality of Phragmites australis silage and rumen fermentation characteristics. © The Author(s) 2023.     

玉林市规模化猪场口蹄疫抗体监测及免疫效果分析

正口蹄疫(foot and mouth disease,FMD),又称口疮热,是由口蹄疫病毒(FMDV)引起的主要侵染偶蹄动物的一种急性、热性和高度接触性传染病[1],该病传播途径多、速度快,曾多次在世界范围内暴发流行,给养殖业造成巨大经济损失。鉴于此,世界动物卫生组织(OIE)将其列为A类传染病之首。目前,有2/3的OIE成员国流行FMD[2]。玉林是广西的养猪大市,2016年生猪饲养量为1 658.36万头,占广西饲养总量的22.95%。由于生猪养殖量大,健康状况各异,规模化猪场的猪     

棉花杂交制种几种方法评价

<正> 在棉花杂交制种方法研究上,由于选用的亲本材料不同,所以采取的制种途径也有所不同,但各种制种方法各有特色,现对各种制种方法作一简要评价。 1 人工去雄授粉杂交制种 此方法研究最早,而且最为成熟,是目前最为常用的方法。由原来的选花杂交,挂线标记,改进为现在的去早、晚蕾,集中时期,全株制种,每667m~2产量由原来40～60kg提高到现在90～110kg。用此种方法选配杂交组合,亲本不受限制,选配自由,较容易筛选到高优势杂     

应用型本科院校图书馆学科服务探讨

应用型本科院校图书馆因缺乏对学科服务的系统研究,学科服务之路或举步维艰或停止不前,学科服务的内涵价值未能体现。分析应用型本科院校开展学科服务的可行性,设计系统观视野下的应用型本科院校图书馆学科服务系统框架,以河池学院图书馆实践为例,探索应用型本科院校学科服务应用之路径。     

水稻机械化直播栽培技术

水稻机械化直播技术是一种新的轻型栽培技术。它省去了传统的育秧、拔秧、插秧 3道环节，大大减轻了劳动强度，具有明显的省工、省时、省秧、节本、增产、增效等特点，很有推广价值。但该技术对机械的操作、品种的选用、田间的管理都有较高的要求，在实施中要注意以下几点。　　(1)播期 直播水稻不宜播早稻，单季晚稻较适宜。一般冬闲田，大麦茬田在 5月中旬播种，油菜茬田在 5月下旬～ 6月上旬播种。　　(2)选种 水直播稻根系扎不深，成熟期易倒伏，应选用优质、高产、抗病、矮秆、抗倒伏的稻种，如中粳 95－ 21、晚粳 95－ 16、武香粳 9号…