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-  2015 

陕北地区土地生态系统固碳释氧价值量动态测评

DOI: 10.11821/dlyj201508010

Keywords: NPP,生态系统,固碳释氧,价值量,陕北

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Abstract:

摘要: 基于1980-2010年的遥感数据和气象台站实测数据,利用光能利用模型对陕北地区植被净第一生产力进行了测评,从而计算得到植被固碳释氧价值量,并分析了其变化特征。不同土地利用类型固碳释氧物质总量排序为:草地>林地>耕地>未利用地>建设用地。空间分布上,陕北地区南部和北部府谷县和神木县固碳释氧价值总量变化的波动性较强,陕北西北部碳释氧价值总量的年际变化较为平缓。近30年来,陕北地区固碳释氧价值总量总体上呈持续增加趋势,固碳释氧价值总量增加的区域主要分布在榆林中北部地区,且大部分呈可持续增加趋势;减小区主要分布在陕北西南部的甘泉县、富县、黄陵县、志丹县的南部以及延安市南部的富县与宜川县的交界处,且呈强烈的持续减小趋势。生态固碳释氧价值量与月降水量整体上呈正相关,与月均温呈负相关。固碳释氧价值量的变化对降水量的变化响应较敏感,气温需要通过与其他气候系统进行耦合,从而协同对固碳释氧价值量产生影响。陕北地区生态系统固碳释氧价值总量受降水量的影响较强,两者在空间上呈现出正相关,且由南向北、由东南向西北呈减小的趋势;价值总量与气温的相关系数由南向北逐渐增加,中南部呈负相关,北部呈正相关。

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