Split-plot field experiment with 2-year-old triploid Populus tomentosa clone S1,S6,S8 and S11 as experimental materials and diploid clone S10 as control was carried out in Wei County,Xintai City,Heibei Province.Annual...Split-plot field experiment with 2-year-old triploid Populus tomentosa clone S1,S6,S8 and S11 as experimental materials and diploid clone S10 as control was carried out in Wei County,Xintai City,Heibei Province.Annual change of soil nutrients in different plantation and tree growth indices of height,DBH and volume were determined.The results showed that soil pH increased and the content of organic matter decreased obviously in a year.Total N,available N,total P,available P,and total K decreased to some extents,while no regulation was found for available K.Different clones had no significant effect on the decline of the soil nutrients.Compared with the control S10,the triploid Populus tomentosa grew much better and took up more soil nutrients,with S8 as the best and followed by S1 and S6.展开更多
文摘Split-plot field experiment with 2-year-old triploid Populus tomentosa clone S1,S6,S8 and S11 as experimental materials and diploid clone S10 as control was carried out in Wei County,Xintai City,Heibei Province.Annual change of soil nutrients in different plantation and tree growth indices of height,DBH and volume were determined.The results showed that soil pH increased and the content of organic matter decreased obviously in a year.Total N,available N,total P,available P,and total K decreased to some extents,while no regulation was found for available K.Different clones had no significant effect on the decline of the soil nutrients.Compared with the control S10,the triploid Populus tomentosa grew much better and took up more soil nutrients,with S8 as the best and followed by S1 and S6.
文摘[目的]优化黑木耳多糖酶法提取的工艺条件。[方法]采用复合酶法提取木耳多糖,以多糖的提取率为指标,考察了酶解温度、酶解溶液p H、浸提料液比以及酶解时间对黑木耳多糖提取效率的影响,并采用TLC薄层色谱层析法分析提取出的黑木耳多糖的成分。[结果]试验确定了复合酶酶解提取黑木耳多糖的最佳工艺条件:浸提料液比1∶40 g/ml,酶解溶液p H 7.0,酶解温度40℃,酶解时间3.0h。在此条件下,黑木耳多糖的提取率为4.353%,所含有的单糖为D-葡萄糖。[结论]研究可为黑木耳多糖的提取提供参考依据。
