Analysis of Factors Influencing the Growth of Export of Agricultural Products in Yunnan Province: An Empirical Study Based on CMS Model

Yunnan Province is the bridgehead for the opening of the southwest region in China,and the economic frontier of China-ASEAN economic cooperation,where the export of agricultural products plays an important role in promoting the openness of the southwest region and strengthening China-ASEAN economic cooperation.In this paper,we use CMS model to analyze causes of the increase in the exports of agricultural products in Yunnan Province during the period 2001-2010.It is found that the expanded import scale of agricultural products in the world,improvement in the export competitiveness of products and the adaption of product export structure to the changes in the structure of world import demand,are the main factors responsible for increase in the exports of agricultural products in Yunnan Province.In recent years, the improvement of competitiveness of the export of agricultural products becomes a key factor for the growth of the export of agricultural products in Yunnan Province.In terms of the products classified,strong export competitiveness has promoted the export of plant products,such as beverages and tobacco,while weak export competitiveness and unreasonable export structure has impeded the export of animal products,plant and animal oil and fat products.

云南省肠道蠕虫流行状况

目的 调查云南省肠道蠕虫的流行病学特点,为制定防治措施提供科学依据。 方法 按照全国第二次重要人体寄生虫病现状调查实施细则要求进行。 结果 调查 16 060 人,3 618 人为阳性感染,感染率 22. 53%,滇东、南、西、北、中的感染率分别为38 72%、47 .28%、11. 72%、30. 32%和5 .58%;不同地域、年龄、民族、职业、文化程度和性别感染率间差异有显著性。 结论 农民和中小学生为肠道蠕虫感染的主要目标人群,边远贫困地区的感染率远高于发达地区,今后应加强重点人群和地区的卫生宣教和防治工作。

滇中高原云南松天然林和人工林土壤呼吸特征的比较

以云南磨盘山国家森林公园云南松天然林和人工林为研究对象,采用LI-6400-09便携式土壤呼吸室对土壤呼吸速率进行连续定位观测。结果表明:(1)两种林分的土壤呼吸速率具有明显的季节变化,均呈单峰曲线趋势;云南松天然林土壤呼吸速率在1.58~4.23μmol·m-2s-1之间,变异幅度为2.68;人工林土壤呼吸速率在1.13~3.34μmol·m-2s-1之间,变异幅度为2.96。(2)土壤呼吸速率的季节变化与不同层次土壤含水量均显著正相关(p<0.05),而与不同层次土壤温度的相关性仅在云南松人工林达到显著水平。(3)双因素关系模型拟合结果表明,土壤温度和含水量共同解释了云南松天然林和人工林土壤呼吸速率的80.8%~93.0%和84.2%~85.9%。(4)两种林分土壤呼吸速率与土壤有机质含量相关性不显著(p>0.05),土壤全氮含量仅与云南松天然林土壤呼吸相关性显著(R2=0.712,p<0.05),而土壤水解氮含量对两林分土壤呼吸的影响均达到显著水平(p<0.05),土壤C/N则与两林分呈极显著(p<0.01)的负相关关系。因此,与天然林相比,人工林土壤温度、湿度及土壤C、N养分含量等土壤环境因子都存在变化,从而导致云南松天然林和人工林土壤呼吸速率时空变化的差异性。

关于云南文化地理研究的几点思考

云南文化具有多样性、内陆性、边缘性和封闭性等多重特点。开展云南文化地理研究具有重要的学术价值和现实意义 ,它不仅是继承和发扬民族文化的需要 ,也是实施西部大开发、建设民族文化大省的需要。