title: [Soil respiration variations in winter wheat field in different previous crops and its influencing factors].
abstract: This study was to define the Variations of soil respiration, the response of influence factors to soil respiration and carbon sink in the total growing season, in winter wheat field of different previous crops. The results showed that: (1) as soil depth increases, the response of temperature to soil respiration rate also increased with a lag; (2) the soil respiration rate was quadric to soil moisture, phosphorus, potassium, soil urease activity, soil temperature, soil moisture as the main factors had an effect on soil respiration rate; soil temperature had the stronger effect on soil respiration rate when potassium had the weaker effect on soil respiration rate; (3) the average carbon emission rate in wheat filed of different previous crops showed as follow: Pepper of previous crops > celery of previous crops > corn of previous crops > eggplant of previous crops. The intensity of carbon "sink" displayed as follow: eggplant of previous crops > celery of previous crops > corn of previous crops > pepper of previous crops. As for the trials of this study, although the soil respiration rate is highest in the winter wheat filed of previous pepper, the amount of carbon fixed is the most. Its ratio of net primary productivity (NPP) and soil carbon release quantity was highest, so carbon sink was the strongest. If rotation planting was arranged according to the purpose of increasing carbon sink and reducing carbon emissions, pepper was relatively appropriate stubbles crop, followed by corn crop, celery and eggplant.
authors.affiliation: College of Forestry, Northwest A & F University, Yangling 712100, China. haowang2000@163.com
authors.forename: Wang-Lin
authors.initials: WL
authors.lastname: Hao
authors.forename: Yin-Li
authors.initials: YL
authors.lastname: Liang
authors.forename: Xing
authors.initials: X
authors.lastname: Wu
authors.forename: Xing-Jun
authors.initials: XJ
authors.lastname: Lin
authors.forename: Yan-Li
authors.initials: YL
authors.lastname: Zhu
authors.forename: An-Rong
authors.initials: AR
authors.lastname: Luo
mesh_terms: D002245:Carbon Dioxide / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D014908:Triticum / Q000254:growth & development* / Q000378:metabolism; D014675:Vegetables / Q000254:growth & development; D014867:Water / Q000378:metabolism; D003313:Zea mays / Q000254:growth & development
chemical_list: D012987:Soil; D014867:Water; D002245:Carbon Dioxide; D010758:Phosphorus; D011188:Potassium