汉江水源区土地利用碳源/汇效应的空间差异分析——以陕南为例

Spatial-temporal Differences of Carbon Source/Sink in Hanjiang River Basin Upstream Land Use——A Case Study of Southern Shaanxi

梳理了土地利用碳源/汇途径,估算了2010年陕南不同土地利用方式的碳源/汇。结果表明:79%的碳源来自于建设用地;农作物、林业、林地碳汇分别占41.44%、31.12%、24.16%,区域碳吸收大于碳释放,净碳汇1 467 751tC-eq;农作物碳汇区内差异很大,高值区在河谷地带,向两侧随高度增加递减,大巴山地高于秦岭山地;林业碳汇区内差异相对较小,河谷地带偏低,两侧山地区林业碳汇较高;两大盆地是净碳汇负值区,向周边山区碳汇逐渐增加,汉台区碳源密度值最高。

The carbon source and sink of various land uses in southern Shaannxi in 2010 were estimated.The results were as follows：The construction land was the primary cause of carbon source,while corps,forestry and forest land were the main three types of carbon source;The corp carbon sink which was higher in Daba Mountainous areas than Qinling Mountainous area,and declined from the valley to the sides;The forestry carbon sink varied little form the valley with lower density to the flanks with higher density;The two great basins were the net carbon source,which accumulated gradually in its surroundings;The highest carbon source area was in Hantai district.