黄土高原典型区退耕还林还草工程实施效果实证分析
Assessment of the impact of Grain for Green project on farmers' livelihood in the Loess Plateau
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摘要: 为缓解黄土高原地区水土流失、土地退化等生态环境问题, 中国自1999年开始在该地区实施退耕还林还草等生态保育工程。选取甘肃省会宁县为研究区, 基于农户问卷调查、统计资料及相关政府报告, 应用统计学软件SPSS和满意度指数分析法, 对典型区退耕还林还草工程实施前后土地利用、种植养殖结构、农户经济收入的变化进行了研究, 并调查了农牧民对退耕还林还草工程影响的满意度, 旨在评估退耕还林还草工程实施对黄土高原典型区农户生产生活的影响。结果显示, 退耕还林还草工程对会宁县的土地利用结构具有重要影响, 有4.48%的耕地转换成草地和林地, 退耕还林还草工程取得了较好效果。但与此同时, 农户问卷调查显示, 有0.08 hm2·户-1大于25°坡耕地未实施退耕, 表明工程实施需要加强监督并及时巩固退耕成果。工程实施后, 会宁县谷物、薯类、豆类和油料作物的种植面积和单位面积产量都有一定增长, 产量提高的主要原因是耕地的投入和耕作集约化程度有所提高。由于耕地面积减少, 为提高土地利用效率, 会宁县政府通过重点发展地膜玉米产业调整种植业结构, 玉米种植面积增加近3倍。过去10多年间, 会宁县还修建了大量梯田, 这也有利于提高单位土地面积产出。另外, 退耕还林工程实施后, 会宁县家畜养殖数量有一定增长, 但由于自然环境限制和饲草来源不足等原因, 养殖规模维持在较低水平。由于连年旱灾导致种植业风险增大, 农户环保意识增强, 打工收入高等原因, 较多农户选择外出打工, 使打工收入成为最重要的收入来源, 占总收入的62.69%。农户对退耕还林还草工程实施的9个方面较为满意, 但在就业和收入方面满意度较低, 满意度分别为 0.1和 0.2。本研究结果可为黄土高原典型区退耕还林还草工程进一步实施和生态系统可持续管理决策提供参考。Abstract: The Chinese government launched the Grain for Green project in 1999 to mitigate increasing soil erosion and land degradation in the Loess Plateau. By using Huining County of Gansu Province as a typical Loess Plateau region, the impact of the Grain for Green project on the livelihoods of the local people in the Loess Plateau was investigated. The research data were collected through face-to-face household questionnaire survey and from environmental, social and economic statistics as well as relevant government reports. Data analysis was conducted in SPSS statistical software and relevant satisfaction indices computed. Changes in land use, cropping structures and animal raising forms, and farm family income were analyzed along with farmers' satisfaction with the effects of the Grains for Green project. The study revealed changes in land use structure since the implementation of the Grain for Green project from 2000 to 2010. About 4.48% of the cultivated land was turned into grassland and forest. There was 0.08 hm2 over 25° slope cultivated land not returned to forest or grassland for per househole. Therefore there was the need to enhance implementation of the project and consolidate all project achievements. The results showed increases in yields and cultivated land areas of local major crops, including cereals, tuber crops, beans and oil crops. This was as a result of increased investment in cultivated lands and intensification of agricultural practices such as terrace construction. With the promotion of mulching cultivation techniques such as plastic film mulching for maize by Huining go- vernment, the acreage of land under maize had increased approximately 3 times. Animal husbandry had increased slightly due to severe natural conditions such as drought and insufficient forage production and supply. This suggested that the local breeding industry was still at a low stage. Based on increased farming risk due to drought, there was need to enhance farmers' consciousness of environmental protection. Also because wages were higher in cities than that in counties, most households chose to work in cities. This suggested that cities wage was the most important source of income of farmers, accounting for 62.69% of total income. Investigating farmers' satisfaction with the Grain for Green project suggested a general satisfaction with the project. About 9 of 11 impact indicators responses were positive. Dissatisfaction mainly came from worsening employment opportunities and low wages, respectively with satisfaction degrees of ?0.1 and ?0.2. The study was expected to positively contribute to further implementation of the Grain for Green project and sustainable ecosystem management in the Loess Plateau.