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陕西省退耕还林固碳释氧价值分析

范建忠,李登科**,周辉   

  1. (陕西省农业遥感信息中心, 西安 710014)
  • 出版日期:2013-04-10 发布日期:2013-04-10

Valuation on carbon fixation and oxygen release in reforested croplands of Shaanxi Province of China.

FAN Jian-zhong, LI Deng-ke**, ZHOU Hui   

  1. (Agricultural Remote Sensing Information Center of Shaanxi Province, Xi'an 710014, China)
  • Online:2013-04-10 Published:2013-04-10

摘要: 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/T 1721—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299 g·m-2·a-1。与2000年相比,2010年陕省退耕还林区固碳量增加了5.37×106 t·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1.43×107 t·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。

Abstract: By using the EOS/MODIS NPP data of remote sensing biogeochemical model (BIOME-BGC), this paper analyzed the spatiotemporal variations of vegetations carbon fixation quantity in the reforested croplands of Shaanxi Province, China in 2000-2010, and estimated the service values of the vegetation carbon fixation and oxygen release, according to the specifications for the assessment of forest ecosystem services in China. From 2000 to 2010, the estimated carbon fixation density in the reforested croplands was averagely 299 g·m-2·a-1. As compared to the year 2000, the amount of carbon fixation in the reforested croplands in 2010 increased by 5.37×106 t·a-1, and the carbon fixation value totaled 1.401 billions Yuan, accounting for 50.4% of the increment value of the carbon fixation in the Province, while the area of the reforested croplands only occupied 38.5% of the total area of the Province. The amount of oxygen release in the reforested croplands increased by 1.43×107 t·a-1, and the oxygen release value totaled 5.053 billions Yuan. In the reforested croplands, the carbon fixation density had a slow increase (though with fluctuation), but the increasing trend was more significant and the increment was higher than that in the perimeter zones. The area where the carbon fixation density increased occupied 99.8% of the reforested cropland area, while the area where the carbon fixation density decreased only occupied 0.2%. The proportion of the total area with low carbon fixation density was decreasing, while that with medium and high carbon densities was increasing. In the reforested cropland area, the carbon fixation density in the main land-use types had an obvious increasing trend, while that in different steep lands showed different increasing trend, being most significant (P<0.01) in>25° lands. It was suggested that with the implementation of the project of reforesting cultivated land, vegetation coverage improved gradually, and significant benefits were obtained from the carbon fixation and oxygen release in reforested cropland area.