Subjects: Biology >> Botany >> Applied botany submitted time 2022-07-05 Cooperative journals: 《广西植物》
Abstract： The response of arbuscular mycorrhizal fungi (AMF) colonization percentage to slope position and shrub species and the key influencing factors were identified as well in karst slopes, which is the prerequisite for rational utilization of soil AMF to promote karst vegetation restoration. Based on field investigation of typical shrub communities and environmental variables on slopes of a karst peak cluster depression catchment. The fine root samples of three typical shrub species (Vitex negundo, Alchornea trewioides and Pyracantha fortuneana) were collected from three positions (upper, middle and lower) along three slopes. The frequency, intensity and abundance of AMF colonization were detected and calculated by the Trypan blue method. The results were as follows: (1) The colonization frequency, colonization intensity and abundance of AMF for Vitex negundo and Alchornea trewioides were higher than those for Pyracantha fortuneana in the same slope. The colonization intensity for Vitex negundo and Pyracantha fortuneana in the lower slope was higher than that in the upper or middle slope. The abundance of AMF for Alchornea trewioides in the middle slope was significantly higher than that in the upper and lower slope (P<0.05). (2) Shrub species had significant effect on the colonization frequency, intensity and abundance of AMF, but slope position only had significant effect on the colonization intensity of AMF. Slope position and shrub species had significant interactive effect on the abundance of AMF (P<0.05). (3) Soil depth and total potassium content were identified as the two strongest explanatory factors on AMF colonization according to the redundancy analysis (P<0.05). Therefore, the rational use of soil AMF to promote vegetation restoration in karst areas needs to consider the choice of terrain and species, and should pay attention to the water and soil conservation.
Subjects: Biology >> Zoology submitted time 2017-10-23 Cooperative journals: 《动物营养学报》
Abstract：为了研究低聚木糖（xylo-oligosaccharide,XOS）对生长肥育猪生长性能、胴体性状和肉品质的影响，试验选取平均体重为30 kg左右的三元杂交猪80头，随机分为8组，每组10头，公、母各占1/2，单栏饲养。试验设对照组、抗生素组，30~65 kg阶段100、250和500 g/t XOS组，以及30~100 kg阶段100、250和500 g/t XOS组。分别于试验开始和结束时记录每头猪的空腹体重及采食量，计算平均日采食量（ADFI）、平均日增重（ADG）和料重比（F/G）；于试猪平均体重达100 kg时屠宰采样，测定胴体性状、肉品质和肌肉化学成分。结果表明：与对照组或抗生素组相比，饲粮添加不同剂量的XOS对生长肥育猪的ADFI、ADG、F/G、胴体性状和肉品质均无显著影响（P＞0.05）；30~65 kg阶段添加250 g/t XOS可显著增加脾脏指数以及背最长肌粗蛋白质含量（P<0.05）；30~100 kg阶段添加500 g/t XOS可显著增加脾脏指数及背最长肌粗蛋白质含量（P<0.05）。综上所述，饲粮添加不同剂量的XOS虽对生长肥育猪的ADFI、ADG、F/G、胴体性状和肉品质等指标影响不显著，但可通过增加肌肉粗蛋白质含量而改善猪肉营养价值；以30~100 kg阶段添加500 g/t XOS效果较佳。
Subjects: Biology >> Zoology submitted time 2017-10-23 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究枯草芽孢杆菌对围产期母猪繁殖性能和子代生长的影响。试验选用2~4胎次、预产期相近的妊娠85 d的健康大白猪40头，随机分为2组，每组20头。对照组饲喂基础饲粮，试验组在基础饲粮中添加250 g/t的枯草芽孢杆菌制剂。试验期为妊娠85 d至产后21 d。分别于母猪妊娠85、112 d和产后21 d测量母猪背膘厚并计算背膘损失。于产后1和21 d耳缘静脉采血，肝素抗凝，离心分离血浆，测定血浆生化指标。于产后1 d记录母猪的产仔数和产活仔数，并称取仔猪出生窝重。于产后21 d称取仔猪断奶窝重并计算断奶窝日增重；每天观察并记录每窝仔猪腹泻情况，计算腹泻率。结果表明：与对照组相比，饲粮添加枯草芽孢杆菌制剂对母猪繁殖性能无显著影响（P＞0.05），但显著降低了仔猪1~7 d和1~21 d腹泻率（P<0.05），显著增加了产后21 d母猪血浆免疫球蛋白M（IgM）含量（P<0.05），且产后1 d母猪血浆白蛋白（P=0.087）和IgM（P=0.096）含量以及产后21 d背膘厚（P=0.096）均呈增加趋势。综上所述，饲粮添加枯草芽孢杆菌制剂虽然不影响母猪繁殖性能，但可增强机体对蛋白质的利用和免疫力，降低仔猪腹泻率。
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