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坡面草被覆盖对坡沟侵蚀产沙过程的影响 总被引：13，自引：0，他引：13
By scouring experiments, the changeable process and characteristics of sediment yield in the hillslope-gully side erosion
system with different coverage degrees and spatial locations of grass were studied. Five grass coverage degrees of 0, 30%,
50%, 70%, 90%, three spatial locations of grass (upslope, mid-slope, low-slope) and two water inflow rates of 3.2 L/min, 5.2
L/min were applied to a 0.5 by 7 m soil bed in scouring experiments. Results showed that the sediment yield decreased with
the increase of grass coverage degree at 3.2 L/min water inflow rate in scouring experiments and the sediment yield with different
grass locations on the sloping surface was in the order of upper > middle > lower. At 5.2 L/min water inflow rate, the differences
of sediment yield among various grass coverage degrees were increased, whereas the changeable tendency of sediment yield with
different grass locations on the whole sloping surface was not very obvious. The proportion of sediment yield from the gully
side increased in an exponential relationship with the increase of grass coverage degree. When the grass was located on the
lower position of hillslope, the influence for accelerating gully erosion is the greatest.
Foundation: National Basic Research Program of China, No.2007CB407201; National Key Technology R&D Program, No.2006BAB06B01-06; Science
and Technique Development Foundation of YRIHR, No.200603
Author: Li Mian (1968–), Ph.D and Senior Engineer, specialized in soil erosion. 相似文献
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坡面草被覆盖对坡沟侵蚀产沙过程的影响 总被引：11，自引：0，他引：11
通过室内放水冲刷试验方法,研究了坡沟系统坡面不同草被覆盖度及空间配置下,坡沟系统侵蚀产沙变化过程及特征。结果表明,放水流量较小时,覆盖度越高,侵蚀产沙量越小;坡面草被不同空间配置下的产沙量大小依次是：坡上部 > 坡中部 > 坡下部。大流量时,不同草被覆盖度间的产沙量差异增大,不同草被空间配置下的产沙量变化规律不十分显著。沟坡产沙比随坡面草被覆盖度的增加呈指数增加,大流量比小流量下的增加幅度要大。坡面草被布设在坡下部时,其对沟坡侵蚀的危害最大。坡沟系统侵蚀产沙变化过程是增加-稳定-下降,其变化的阶段性不如单一坡面明显。 相似文献
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地胆头注射液对鸡大肠杆菌感染的治疗效果 总被引：1，自引：0，他引：1
给香鸡皮下接种大肠埃希氏菌ATCC259220.5mL/只(含菌量为4×109～5×109mL-1), 复制了鸡大肠埃希氏菌ATCC25922感染病例。用自制的地胆头注射液(每安瓿5mL,相当于生 药2g)通过胸肌多点注射,进行治疗试验。结果发现,用药后第2天,供试鸡只的发病率明显下 降,效果和环丙沙星注射液相当。在试验结束时,各试验组鸡只均被治愈。在各组供试鸡的体重、 死亡率及治疗总有效率方面,地胆头注射液均表现出明显疗效,高、中、低各剂量组鸡只的总有效 率分别达到95.29%、88.24%和75.29%。 相似文献
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