摘要
以太行山低山丘陵区坡改梯土壤为研究对象,探究坡改梯后利用为耕地和园地不同年限的土壤有机碳各组分含量及其碳库质量演变特征。结果表明:坡改梯后,土壤有机碳各组分含量(有机碳TOC、可溶性有机碳DOC、易氧化有机碳ROC、微生物量碳MBC、微生物熵qSMBC、碳排放量CO2-C)和土壤碳库质量(碳库指数CPI、碳库管理指数CMI、碳库活度指数LI、有机碳储量SOCs)随时间变化特征总体为8年>坡改梯前>20年>2年。坡改梯后,利用为园地的土壤有机碳各组分整体高于耕地,且园地CMI、CPI、LI较耕地分别显著提高31.2%、19.3%、12.3%。在不同土层间,TOC、DOC和ROC随深度加深而降低,且0~20cm比20~40 cm土层对不同利用方式响应更加敏感。坡改梯造成的土壤碳损失8年左右达到坡改梯前水平,利用为园地比耕地对土壤碳库质量的提升潜力更高。
Quantity and quality of soil organic carbon pool were investigated before and after the transformation from slope to terrace in the hilly area of Taihang Mountain.Soil used as cultivated land and orchard for different ages was studied to reveal the effect of terracing on soil organic carbon changes.Results showed that after the transformation from slope to terrace,content of soil organic carbon(TOC)and its fractions including soluble organic carbon(DOC),readily oxidized organic carbon(ROC),microbial biomass carbon(MBC),microbial entropy(qSMBC)and soil carbon emissions(CO2-C)as well as indexes indicating quality of soil carbon pool such as carbon pool index(CPI),carbon management index(CMI),lability index(LI)and soil organic carbon stocks(SOCs)generally followed the trend of 8 year>Before Terracing>20 year>2year.After the transformation form slope to terrace,contents of soil organic carbon fractions in orchard were higher than that in cultivated land.Compared with cultivated use after terracing,CMI,CPI and LI in orchard increased by 31.2%,19.3%and 12.3%,respectively.Contents of TOC,DOC and ROC decreased with soil depth,and topsoil(0-20 cm)was more sensitive to different land uses after terracing than subsoil(20-40 cm).The loss of soil organic carbon content and the decline in quality caused by terracing could be restored around 8 years after transformation.It is revealed that compared with cultivated use after terracing,orchard showed higher potential to improve the quality of soil carbon pools.
作者
耿其明
王洋
闫丰
杨天戈
陈亚恒
GENG Qiming;WANG Yang;YAN Feng;YANG Tiange;CHEN Yaheng(College of Resources and Environmental Science,Hebei Agricultural University,Baoding 071000,China;College of Land and Resources,Hebei Agricultural University,Baoding 071000,China)
出处
《河北农业大学学报》
CAS
CSCD
北大核心
2020年第1期62-68,共7页
Journal of Hebei Agricultural University
基金
河北省高等学校科学研究计划(QN2017079)
河北省引进留学人员资助项目(CN201708、ZB201701)
。
关键词
坡改梯
耕地
园地
土壤有机碳
碳库管理指数
transformation from slope to terrace
cultivated land
orchard
soil organic carbon
carbon pool management index
