Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Soil Science submitted time 2023-08-25 Cooperative journals: 《干旱区研究》
Abstract： To explore the trend of the change of the soil respiration flux and main influencing factors in theprocess of desertification reversal, 9 a, 18 a and 30 a ages of Hedysarum laeve shrubbery and no afforestationquicksand land (CK) were selected at Mu Us sandy land in Northern China. Using the Li-8100 carbon fluxobservation system which produced in the United States, measured soil respiration from May to October. At thesame time, the main influencing factors were determined and analyzed. The results showed that: (1) Both soilrespiration rate and flux increased first and then decreased in the growth season from May to October, and thehighest value appeared in July. (2) The soil respiration rate and flux showed a continuous increasing trend withthe age of the Hedysarum laeve shrubbery, the Q10 value shows a continuous downward trend. From May toOctober in the growing season, the order of average soil respiration rate was: 30 a（2.16 μmol·m-2·s-1）>18 a（1.98μmol·m-2 ·s-1）>9 a（1.41 μmol·m-2 ·s-1）>CK（0.24 μmol·m-2 ·s-1）; the soil respiration carbon flux was 30 a(365.74 g C·m-2)>18 a (313.63 g C·m-2)>9 a (218.66 g C·m-2)>CK (40.08 g C·m-2). (3) The seasonal variationof soil respiration rate in CK, 9 a and 18 a plots was mainly affected by the coupling effect of soil temperatureand water (P<0.01), while the main control factor in 30 a plots was soil temperature (P<0.01). (4) Soil respirationflux was positively correlated with vegetation biomass, soil organic carbon and total nitrogen content (P<0.05).
Hits
Hits
Downloads
Comment