title: [Variation characteristic in soil respiration of apple orchard and its biotic and abiotic influencing factors].
abstract: To evaluate the orchard variability of soil respiration and the response of soil respiration to its influencing factors is helpful for a deep understanding about the effects of converting cropland to apple orchard. A field experiment was conducted in the Changwu State Key Agro-Ecological Station. Soil respiration, soil temperature, soil moisture and roots biomasses were periodically measured in a mature apple orchard during 2011 and 2012. Soil respiration decreased as the distance from the trunk increased. The cumulative soil respiration in the 0.5 m-distance from the trunk was 20% and 31% higher than that in the 2 m-distance from the trunk, respectively in 2011 and 2012. The temperature sensitivity of soil respiration (Q10) was relatively lower in the 2 m-distance than that in the 0. 5 m-distance in both years. Soil temperature and soil moisture were slightly higher in the 2 m-distance, but there was no significant difference between the 2 m-distance and the 0. 5 m-distance. Soil respiration and soil temperature showed a significant exponential relationship, but there was no positive correlation between soil moisture and soil respiration. Soil temperature changes can explain seasonal variation of soil respiration well, but it could not explain its spatial variability. Root density was an important factor for the spatial variability of soil respiration and Q15. Variation of soil respiration coefficient was 23% -31%. Therefore, the distance from the trunk should be considered when estimating orchards soil respiration.
authors: Rui
authors: R
authors: Wang
authors: Sheng-Li
authors: SL
authors: Guo
authors: Qing-Fang
authors: QF
authors: Liu
authors: Yan-Jun
authors: YJ
authors: Zhang
authors: Ji-Shao
authors: JS
authors: Jiang
authors: Hui-Min
authors: HM
authors: Guo
authors: Ru-Jian
authors: RJ
authors: Li
mesh_terms: D018533:Biomass; D002980:Climate; D004784:Environmental Monitoring; D027845:Malus / Q000254:growth & development*; D018517:Plant Roots / Q000254:growth & development; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D013696:Temperature
chemical_list: D012987:Soil