描述:
an City, Hanzhong City and Yangling region in
Shaanxi Province, and on the basis of domestic and foreign literature, this paper describes the
Practice and Enlightenment of the development of domestic and international kiwifruit
industry,and analyses the status, problems and advantages of Shaanxi’s kiwifruit industry,
discusses the principles of developing Shaanxi kiwifruit industry, market positioning and
planning, proposes the Suggestions of the development of Shaanxi’s kiwifruit industry.
描述:
ttention, but
also agriculture and eco-environmental sustainable development important
problems. Farming-pastoral Transitional zone in north China, as our county
returning farmland to forest and returning cropping land to grassland are the
focus areas, natural environment and socio-economic conditions shown a
clear transition characterized by the transition zone of the interpenetration and
staggered distribution of agriculture and animal husbandry, which is curbing
desertification important ecological barrier, but also ecologically fragile belts.
全文:Walling和He提出的质量平衡模型及~(137)Cs深度分布的扩散和迁移复合过程物理模型分别计算耕作土壤与非耕作土壤侵蚀速率。兰州不同土地利用类型的土壤侵蚀速率范围为1200-76000t/k m