渭北旱塬苹果园的生草效应

在无灌溉条件的渭北旱塬苹果园连续6年进行果园生草与清耕研究的结果表明:果园种三叶草,土壤有机质含量增加33.8%,果实产量增加14.4%,单果重增加10.2%,可溶性固形物含量增加11.3%,硬度增加9.2%,着色指数增加35.0%,总收入增加26.59%,种草产投比为9.07。果园生草首选草品种为白三叶草。     

育成期高能饲喂下开产与未开产蛋鸡肝脏转录组差异分析

对育成期高能饲喂的开产与未开产蛋鸡进行肝脏转录表达谱差异分析,探明在高能饮食状态下肝脏中影响开产的基因,为提高产蛋打下基础.以高能饲粮饲喂育成期蛋鸡为对象,运用高通量测序平台对开产与未开产鸡的肝脏进行转录组测序,使用HTSeq和DESeq等方法分析基因表达量并运用qRT-PCR验证,并以超几何分布对差异表达基因进行GO...     

The impact of vegetation and media on evapotranspiration in bioretention systems

Bioretention systems have known benefits for managing urban stormwater, but there remain knowledge gaps about evapotranspiration (ET) and its role in these systems. This paper investigated how design parameters including growing media and vegetation, as well as climatic variables, can influence ET in bioretention systems. To this end, twenty-four bioretention mesocosms constructed using three media types (i.e., two sandy media types and clay loam mixed with wood chips) and planted with three vegetation types (i.e., herbaceous mixture, woody mixture, and turfgrass as control) in Okotoks, Alberta, Canada were monitored during the growing seasons (from May to October) between 2018 and 2020. The media moisture in the mesocosms was monitored at the depths of 20 and 40 cm to study how the design parameters and their interactions could influence ET. The results confirmed the roles of design and climatic variables on ET, while their effects were more prominent at the surface layer. The sandy media with the low organic matter (SD1) and the woody vegetation appeared to outperform the other media and vegetation types in promoting ET. The findings demonstrated the non-stationary nature of the ET function in the mesocosms. The effects of the design variables, in particular the vegetation, became more prominent over time. In addition, the impact of media-vegetation interactions on ET was identified. The results suggest the need for optimizing bioretention systems with consideration to the design variables, whose roles on ET are time- and depth-variant, to promote ET and, in turn, bioretention performance.