论文部分内容阅读
“利用边际土地种植能源作物发展生物能源”是我国可再生能源战略的重要内容,也得到了一些专家学者的认可,但对于我国到底有多少边际土地尚未有统一认识。为回答这个问题,本研究基于我国目前最权威、最基础的第二次土地利用变更调查数据,从边际土地的范围界定及实际可能供给量的角度出发客观评估该战略的可行性。研究结论提出:从广义上来看,我国边际土地的范围较广,总面积达2.90亿hm~2,但考虑到能源作物种植对气候、地形、土壤的需求,我国可用于能源作物种植的边际土地最大数量为547.87万hm~2,主要地类为灌木林地和其他草地,主要分布在内蒙古、西藏、山西、甘肃、四川、河北等省份。考虑到大面积改变这些地类种植能源作物可能带来西部生态脆弱区的生态环境问题,以及由于这些地类投入产出比较低,在我国当前农业生产处于劣势的社会背景下,通过鼓励农民利用边际土地大面积种植能源作物来发展生物能源的战略存在较大难度。
“The development of bio-energy using marginal land for energy crops” is an important part of China’s renewable energy strategy and has also been endorsed by some experts and scholars. However, there is not yet a unified understanding of how much marginal land in our country there is. In order to answer this question, based on the second most authoritative and basic survey on land use change in our country, this study objectively evaluated the feasibility of this strategy from the perspective of the scope of marginal land and the actual supply possible. The conclusions of the study are as follows: In a broad sense, the marginal land in China has a wide area with a total area of 290 million hm ~ 2. However, taking into account the climate, topography and soil requirements for energy crop cultivation, the marginal land available for energy crop cultivation in China The maximum amount is 5,487,800 hm ~ 2, mainly shrub land and other grasslands, mainly distributed in Inner Mongolia, Tibet, Shanxi, Gansu, Sichuan and Hebei provinces. Considering that the large-scale change of ecological crops in these land-based ecologically-harvested crops may bring about the ecological and environmental problems in the ecologically fragile regions in western China and the relatively low input-output of these types of land, under the current social situation where agricultural production is currently disadvantaged in our country, The strategy of large-scale cultivation of energy crops in marginal lands to develop bio-energy is more difficult.