摘要
利用四川省成都经济区多目标区域地球化学调查获得的土壤有机碳含量数据,探讨了成都经济区不同地貌景观区土壤有机碳的分布特征。山区表层土壤有机碳含量(SOC)最高(22 g/kg左右),较平原区、丘陵区高一倍以上,丘陵区最低(9.49 g/kg)。成都平原区和东部丘陵区深层土壤碳含量相差不大,且均低于研究区深层土壤碳含量均值(6.99 g/kg)。利用指数模型对单位土壤平均碳量(USCATOC)、有机碳储量(USCATOC,h)、有机碳丰度指数(R)进行了估算。结果表明:各地貌单元土壤碳含量、单位土壤平均碳量、有机碳储量、有机碳丰度指数(R)分布具有山区高于平原区、丘陵区最低的一致性特征。龙门山区、西南山区面积约占全区的42%,土壤有机碳储量约占全区的59%;成都平原区、丘陵区面积占58%,土壤有机碳储量约占全区的41%。单位土壤平均碳量、有机碳储量在不同地貌单元中分布的差异主要与不同地貌单元的土壤有机碳含量有关,此外还可能与成土母质、植被发育情况、土地利用方式有关。
In this paper,we investigate the distribution characteristics of soil organic carbon between different landscape areas in Chengdu Economic Zone with soil organic carbon（SOC） data from multi-target regional geochemical survey.The SOC contents of surface soil in mountain area is the highest,nearly 22g/kg,twice more than the plain area or hilly area which contribute the lowest carbon contents（about 9.49g/kg）.There are the similar carbon contents in deep soil between Chengdu plain area and Eastern hilly area,which were lower than the average value（6.99g/kg） of SOC in deep soil of the study area.The unit soil carbon average storage（USCATOC）,Organic carbon storage（USCATOC.h） and the abundance index of soil organic carbon（R） with the index model are estimated.The results show that the SOC,USCATOC,USCATOC.h and R in different geomorphic unit have the same features,i.e.the dates in mountain area are high than those in Chengdu plain area,and the hilly area is the lowest.The region of Longmenshan area and southwestern mountainous area which occupy 42% of the measured area contributed to 59% of USCATOC.h and the region of the plain area and the hilly area which occupy 58% of the measured area contributed to 41% of USCATOC.h.The reason resulting to the distribution content differences of USCATOC and USCATOC,h in the different landscape units is mainly because that the various soil organic carbon contents in different landscape units.In addition,it is related to the differences of the parent material,the vegetation development situation,and the land use types.
出处
《地球科学进展》
CAS
CSCD
北大核心
2012年第10期1126-1133,共8页
Advances in Earth Science
关键词
地貌景观区
土壤有机碳含量
单位土壤平均碳量
有机碳储量
有机碳丰度指数
Landscape area
Soil organic carbon content
Unit soil carbon average storage
Organic carbon storage
Abundance index of soil organic carbon.
