title: [The release amount and its change law of CO2 from soils in Xi'an area].
abstract: On the basis of the principle of which CO2 is absorbed by the solution of NaOH, the release amount of CO2 in soils under different vegetation was observed round the clock. The material shows that the release amount of CO2 from soils in Xi'an area changed clearly in 24 hours in months. The release amount changed from low to high and then to low from the morning to the next morning. The change of the release amount of CO2 was same that as the temperature, but the change of the former was about 4-6 hours later than that of the latter. The temperature was main factor determining change law of release amount of CO2 from soils and its rising and falling bring out the increase and decrease of release amount of CO2. The release amount of CO2 from soils was changing along with different vegetation. The forestry land was greater than grassland and the grassland was greater than the bare land in the release amount. The release amount was greater in day than in night.
authors: Geographical Department of Shaanxi Normal University, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi'an.
authors: Jingbo
authors: J
authors: Zhao
authors: Juan
authors: J
authors: Du
authors: Daoxian
authors: D
authors: Yuan
authors: Yingli
authors: Y
authors: Yue
authors: Xialong
authors: X
authors: Zhang
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D002681:China; D002940:Circadian Rhythm; D006109:Poaceae / Q000737:chemistry / Q000378:metabolism; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology; D013696:Temperature; D014197:Trees / Q000737:chemistry / Q000378:metabolism
chemical_list: D012987:Soil; D002245:Carbon Dioxide