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生态脆弱地区农牧户生产经营行为研究
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摘要
青藏高原是最典型的生态环境脆弱地区,自然灾害频繁,生态环境恶劣,农牧民的生存发展受到极大的不利影响,急需破解生态脆弱性与农牧民生产活动、生存发展之间的矛盾和现实难题。论文以西藏地区典型农牧户微观个体生产经营行为为研究切入点,选用全国农村固定观察点西藏地区的204个面板数据样本,采用线性模型和混合OLS模型以及随机效应模型回归估计方法,分别对影响农牧户种植业生产行为、畜牧业生产行为以及农牧户人均收入的因素进行了系统分析,并以案例形式剖析了那曲地区冬虫夏草产业发展,以求从一个侧面阐释青藏高原特色产业发展与农牧民生产经营行为间的关系。主要的研究结论如下:
     1.运用生态脆弱性定量评价方法评价表明,西藏地区是一典型的青藏高原生态环境脆弱地区。其中,那曲地区、日喀则地区和拉萨市的生态脆弱度值分别为0.560、0.539、0.347,那曲地区和日喀则市属于强度脆弱地区,拉萨市则属中度脆弱地区。
     2.影响农户种植面积的因素分析表明,理论上预测的内部因素禀赋效应成立,外部因素中价格的替代效应大于收入效应。“家庭劳动力数量”、“年末拥有生产性固定资产原值”、“是否拥有农业机械”这些家庭禀赋因素对于家庭的总播种面积具有正向影响,实证结果没有证伪理论上的禀赋效应。“粮食均价”与“是否出售”这两个因素的乘积具有显著的影响作用,这个变量发生的作用机制在于替代效应和收入效应。从实证结果来看,替代效应大于收入效应,从而农作物的种植面积上升。同样,“外出打工人员数量”、“是否拥有农业机械”、“年末拥有居住房屋原值”等禀赋因素变量对总播种面积呈显著性影响,再次体现了禀赋效应。
     3.影响畜牧业生产的因素分析表明,理论上预测的内部因素禀赋效应成立,外部因素中价格的收入效应大于替代效应。“家庭劳动力数量”、“外出打工人员数量”等家庭禀赋因素对于2畜牧业生产的影响符合理论值,“粮食均价”与“是否出售”这两个因素的乘积,显示畜牧业的收入效应大于替代效应,实证结果也是如此。这是因为目前藏区所有耕地的产出几乎不能满足其家庭日常食物消费的需要,因此收入效应较高。
     4.影响农牧民收入的因素分析表明,家庭禀赋因素在农牧民收入中起到决定性作用。日喀则、堆龙德庆和那曲三县(市)农牧民人均收入水平均有所提高,从对于影响收入的因素分析来看,“是否干部或党员户”、“家庭劳动力数量”、“平均受教育年限”、“年末拥有居住房屋原值”等变量对农牧民人均收入有显著影响,这显示目前家庭禀赋因素在居民收入决定中还起到决定性作用,社会化的收入风险分散机制还不够健全,需要进一步加强。
     5.农牧业特色产业发展案例分析表明,那曲地区虫草产业发展在带来巨大经济效益的同时,给虫草产区农牧户生产经营行为带来消极影响,还间接产生一系列负面问题,如影响农牧业的基础地位、虫草资源开发利用程度低、严重破坏生态环境,甚至引起一些社会矛盾等。在今后发展中,应有效引导农牧户家庭经营行为,走综合开发与可持续发展的路子,既能有效促进农牧民增收,又能保护生态环境以及发挥基础产业的基础地位。
     6.从提高农牧户家庭禀赋、注重科技支撑、强化价格引导、(?)、加强区域规划、强调生态保护等方面提出了促进西藏地区农牧业产业发展的政策建议:
The Qinghai-Tibet Plateau is the most typical region that is ecologically fragile, with frequent natural disasters and terrible ecological environment. The situation has created huge negative impact on the local farmers'survival and development. Therefore, it is pressing to solve the conflicts between regional ecological fragility and local farmer's family operating behavior. This paper focuses on researching the family operating behavior of micro farmers of typical counties in Tibet, using204panel data samples from the National rural area observation stations. The regression estimation methods used in the paper include linear model, pooled Ordinary Least Squares model and random effects model. The paper analyzes different factors relating to farmers' operating behavior in farming and livestock sectors and their per capita income. Moreover, a case study on Naqu's Cordyceps sinensis industry is designed to showcase the relationship between the special industry development in the Qinghai-Tibet Plateau and local farmer's family operating behavior. The main conclusions of this paper include:
     Firstly, using the quantitative evaluation method for ecological fragility this paper shows that Tibet is a typical ecologically fragile region in the Qinghai-Tibet Plateau. Specifically, the degrees of ecological fragility of Naqu, Rikaze and Lhasa are0.560,0.539and0.347, Naqu and Rikaze are highly fragile, and Lhasa is medium fragile.
     Secondly, this paper analyzes factors relating to total sown areas, and predicts in theory that the endowment effect of internal factors exists, while among the external factors, the substitution effect of price is larger than the income effect. Family endowment factors including "Number of household labor","Number of labor working outside"," Original value of fixed assets for production at the end of year" and "Whether or not the household possesses agricultural machineries" have positive effect on the total sown areas, and the empirical result doesn't reject the endowment effect in theory. Moreover, the product of "Average grain price" and "Whether grain is sold or not" has significant impact on total sown areas, we can explain this Variable through substitution effect and income effect. According to the empirical result, substitution effect is bigger than income effect, which has increased the total sown areas.
     Thirdly, based on the analysis of factors relating to the livestock industry, this paper shows that the theoretical prediction of endowment effect of internal factors stands, and among the external factors, the income effect of price is larger than substitution effect. The impact of family endowment factors including "Number of household labor" and "Number of labor working outside" on the stock-farming industry is equal to the theoretical value. The product of "Average grain price" and "Whether grain is sold or not" shows that the income effect of livestock industry is larger than the substitution effect, which is the same with the empirical result. The explanation is that currently the production of all lands in Tibet cannot meet the daily needs of family food consumption, and that is why the income effect is relatively higher.
     Fourthly, according to the analysis of factors relating to farmers'per capita income, family endowment factors play a decisive role in farmers'income. The per capita income of farmers in Naqu county, Duilongdeqing county and Rikaze city have all improved. Based on the analysis of factors relating to per capita income, variables including "Whether or not the household has a government official or a Communist Party member","Number of household labor","Number of years of education" and "Original value of fixed assets for production at the end of year" have significant impact on per capita income of farmers. This shows family endowment factors remain decisive in residents'income. Therefore, the social mechanisms for avoiding income risk should be gradually strengthened.
     Fifthly, according to the case study of agricultural special industry, it shows that Naqu's Cordyceps sinensis industry still brings negative impact on farmer's family operating behavior along with the enormous economic benefits, which includes affecting the basic position of agricultural industry, low level of Cordyceps resource's development and utilization, serious environmental degradation, and even worse, causing social tensions. In the future, we should guide the farmers to explore the comprehensive and sustainable development path, in order to increase farmers'income, protecting the environment and consolidating the basic position of agricultural industry.
     Lastly, this paper presents some recommendations on how to develop agricultural industries in terms of enhancing family endowment factors, improving technical capacity, deepening price guidance, building the hedging mechanisms for social income risk, strengthening regional planning and protecting ecological environment, and so on.
引文
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