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利用基于EOS/MODIS的遥感生物地球化学模式(BIOME-BGC)NPP产品(MOD17A3),分析了2000—2010年陕西省退耕还林生态建设工程区植被固碳量时空变化,在此基础上根据林业行业标准《森林生态系统服务功能评估规范》(LY/T1721—2008),估算了退耕还林植被固碳释氧服务价值。结果表明:(1)2000—2010年陕西省退耕还林区平均植被固碳密度为299g·m-2·a-1。与2000年相比,2010年陕省退耕还林区固碳量增加了5.37×106t·a-1,合固碳价值14.01亿元·a-1,占全省固碳价值增量的50.4%,而退耕还林区面积仅占全省总面积38.5%。退耕还林区释氧量增加了1.43×107t·a-1,合释氧价值50.53亿元·a-1。(2)研究期间,陕西省退耕还林区固碳密度在波动中逐年缓慢增加,退耕还林区植被固碳密度变化增加趋势比其周边区域显著,固碳密度增加量比其周边高。陕北退耕还林区固碳密度增加的面积占其总面积的99.8%,固碳密度减少的面积仅占0.2%。退耕还林区低固碳密度所占的面积比例逐年减少,中、高固碳密度所占的面积比例逐年增加。(3)退耕还林区主要土地利用类型固碳密度均呈较明显的增长;不同坡度耕地固碳密度均具有不同程度的上升,退耕还林区>25°坡耕地固碳密度极显著(P<0.01)增加。说明随着退耕还林工程的实施,植被覆盖逐步得到改善,同时获得了显著的植被固碳释氧效益。
Using the remote sensing biogeochemical model (BIOME-BGC) NPP product (MOD17A3) based on EOS / MODIS, the temporal and spatial variations of carbon sequestration in vegetation in the project area of returning farmland to forest in Shaanxi Province from 2000 to 2010 were analyzed. Based on this, The industry standard “Evaluation Criteria for Forest Ecosystem Services” (LY / T1721-2008) estimates the value of carbon sequestration and oxygen release from the conversion of cropland to forest. The results showed that: (1) The average vegetation carbon sequestration density in the area of returning farmland to forestry in Shaanxi Province from 2000 to 2010 was 299 g · m-2 · a-1. Compared with 2000, the carbon sequestration in the area of returning farmland to forestry in Shaanxi Province increased by 5.37 × 106t · a-1 and the combined carbon value was 1.401 billion yuan · a-1, accounting for 50.4% of the increment of the fixed carbon in Shaanxi Province. , While the area of returning farmland to forestry accounted for only 38.5% of the total area of the province. The amount of oxygen released by the conversion of cropland to forestry increased by 1.43 × 107t · a-1, and the value of combined oxygen release was 5.053 billion yuan · a-1. (2) During the study period, the carbon sequestration density in the area of returning farmland to forestry increased slowly and steadily year by year. The trend of increasing sequestration density of vegetation in returning farmland to forestry was more significant than that in the surrounding area, and the increment of sequestration density was higher than the surrounding area. The area of fixed carbon density in returning farmland to forest in northern Shaanxi accounted for 99.8% of the total area and the area of carbon fixation density decreased only 0.2%. The area proportion of low carbon sequestration in the area of returning farmland to forestry is decreasing year by year, and the proportion of the area occupied by middle and high sequestering carbon density increases year by year. (3) The carbon sequestration density of main types of land use in the area of returning farmland to forestry showed a significant increase. The density of carbon sequestration in different slopes increased with different degrees, and the carbon sequestration density at the slope of> 25 ° was significant (P <0.01) increase. This shows that with the implementation of the project of returning farmland to forestland, vegetation coverage has been gradually improved, and at the same time significant benefits of vegetation carbon fixation and oxygen release have been obtained.