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黑河中游山前平原区退耕地土壤有机碳库特征()

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《山地学报》[ISSN:1008-2186/CN:51-1516]

Title:: Soil Organic Carbon Character to Vegetations Changing from Abandoned Farmlands in Plain before Mountain in Middle Part of Heihe River

作者:: 常宗强;裴雯;冯起;苏永红;; 1 中国科学院寒区旱区环境与工程研究所生态水文与流域科学重点实验室，甘肃兰州 730000;
2 甘肃省祁连山国家级自然保护区管理局, 甘肃张掖 734000

Author(s):: CHANG Zongqiang; PEI Wen; FENG Qi; SU Yonghong; 1. Laboratory of Watershed Hydrology and Ecology of Cold and Arid Regions Environmental and Engineering Research Institute , Chinese Academy of Sciences , Lanzhou 730000, China;
2.Management Bureau of Natural Reserve Region of Qilian Mountains, Zhangye 734000, China

Keywords:: soil organic carbon; soil surface CO2 flux; turnover time; abandoned farmland

摘要:: 采用野外调查测定、野外定位研究和室内分析相结合的方法,在黑河中游山前平原区选择邻近相同海拔和土壤类型的退耕(退耕1 a、5 a、10 a)造林地为研究对象,研究了山前平原区退耕地不同退耕年限的土壤碳动态,结果表明:退耕1 a、退耕5 a、退耕10 a和退耕造林地的土壤有机碳含量变化分别为16.89 gC/kg,8.24 gC/kg,8.56gC/kg和9.98 gC/kg,平均土壤有机碳密度分别为8.05 kg/m2,4.78 kg/m2,5.02 kg/m2和6.52 kg/m2。平均土壤有机碳周转时间分别为23 a,25 a,26 a和33 a;不同植被类型土壤CO2通量依次为退耕1 a土...

Abstract:: The paired plots with the same elevation and the soil type of the abandoned farmland (1 year after restored, 5 years after restored and 10 years after restored of the abandoned farmland) were selected as study objects in plain before mountain in middle part of Heihe River,Zhangye of Gansu,northwestern China. Based on the field survey, field orientation study and laboratory analyze and by means of comparison of difference of storage of organic carbon among different years after restored. The result indicate that the soil organic carbon (SOC) content for the 1 year after restored, 5 years after restored and 10 years after restored of the abandoned farmland and plantation of Populous is 16.89 gC/kg, 8.24 gC/kg,8.56 gC/kg and 9.98 gC/kg, respectively; the mean SOC density was 805 kg/m2, 4.78 kg/m2, 5.02 kg/m2 and 6.52 kg/m2, respectively; and the mean SOC turnover time was 23, 25, 26 and 33 years, respectively. The soil surface CO2 flux for cropland, plantation of Populous and rangeland was 530.8 gC/(m2·a), 316.9 gC/(m2·a), 266.1 gC/(m2·a) and 286.9 gC/(m2·a), respectively. The SOC content and the SOC density decreased with soil depth in specific vegetation types, where the SOC turnover time increased with soil depth.

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备注/Memo:: 收稿日期(Received date)：2010-05-21；改回日期(Accepted) : 2010-10-29。
基金项目（Foundation item）：国家自然科学基金(40801001, 40701054)项目资助。\[This work was supported by National Natural Science Foundation of China (40801001, 40701054).\]
作者简介（Biography）：常宗强，男，甘肃会宁人，主要从事干旱区生态水文及碳循环研究。\[Chang Zongqiang, male, born in Huining, Gansu, Mainly study on ecohydrological and carbon cycle in arid region.\] E-mail: changzq@lzb.ac.cn

更新日期/Last Update: 1900-01-01