title: Soil temperature and moisture sensitivities of soil CO2 efflux before and after tillage in a wheat field of Loess Plateau, China.
abstract: As a conventional farming practice, tillage has lasted for thousands of years in Loess Plateau, China. Although recent studies show that tillage is a prominent culprit to soil carbon loss in croplands, few studies have investigated the influences of tillage on the responses of soil CO2 efflux (SCE) to soil temperature and moisture. Using a multi-channel automated CO2 efflux chamber system, we measured SCE in situ continuously before and after the conventional tillage in a rain fed wheat field of Loess Plateau, China. The changes in soil temperature and moisture sensitivities of SCE, denoted by the Q10 value and linear regression slope respectively, were compared in the same range of soil temperature and moisture before and after the tillage. The results showed that, after the tillage, SCE increased by 1.2-2.2 times; the soil temperature sensitivity increased by 36.1%-37.5%; and the soil moisture sensitivity increased by 140%-166%. Thus, the tillage-induced increase in SCE might partially be attributed to the increases in temperature and moisture sensitivity of SCE.
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. zhx973@rcees.ac.cn
authors.forename: Hongxing
authors.initials: H
authors.lastname: Zhang
authors.forename: Xiaoke
authors.initials: X
authors.lastname: Wang
authors.forename: Zongwei
authors.initials: Z
authors.lastname: Feng
authors.forename: Junzhu
authors.initials: J
authors.lastname: Pang
authors.forename: Fei
authors.initials: F
authors.lastname: Lu
authors.forename: Zhiyun
authors.initials: Z
authors.lastname: Ouyang
authors.forename: Hua
authors.initials: H
authors.lastname: Zheng
authors.forename: Wenzhao
authors.initials: W
authors.lastname: Liu
authors.forename: Dafeng
authors.initials: D
authors.lastname: Hui
mesh_terms: D000383:Agriculture / Q000379:methods*; D000388:Air; D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D006813:Humidity; D011891:Rain; D012987:Soil / Q000032:analysis*; D013696:Temperature; D014908:Triticum / Q000254:growth & development*
chemical_list: D012987:Soil; D002245:Carbon Dioxide