Effects of Fertilization on Carbon Emission and Iron Content in Soil at Jasmine Flower Garden in Fuzhou

Effects of fertilizer application on the carbon emission and iron content in soil of a jasmine flower garden were investigated at Difengjiang Jasmine Garden in Fuzhou. Based on the application normally used by the trade, 4 levels of fertilization were implemented, i.e., control (C), normal (N), of N (H), and 2x of N (D). The results showed that the average hourly CO₂ fluxes at various lots were(430.88±142.06) mg·m^-2 for C, (473.08±52.18) mg·m^-2 for H, (435.23±61.21) mg·m^-2 for N, and (478.75±118.64) mg·m^-2 for D. The average CH₄ emission rateswere (38.84±9.69) μg·m^-2·h^-1 for C, (16.77±10.71) μg·m^-2·h^-1 for H, (4.11±4.79) μg·m^-2·h^-1 for N, and(11.92±2.27) μg·m^-2·h^-1 for D. Thus, the CO₂ flux increased by 9.7% for H, 1.01% for N, and 11.10% for D over control, while the CH₄ flux reduced by 56.82% for H, 89.41% for N, and 69.30% for D over control. The average total Fe contents were(9.11±0.08) g·kg^-1 for C, (7.87±0.09) g·kg^-1 for H, (9.37±0.25) g·kg^-1 for N, and (8.90±0.21) g·kg^-1 for D; theaveraged Fe²⁺ content, (1.08±0.01) g·kg^-1 for C, (1.08±0.07) g·kg^-1 for H, (1.01±0.09) g·kg^-1 for N, and(1.09±0.04) g·kg^-1 for D; and, while the average Fe³⁺ content, (8.04±0.08) g·kg^-1 for C, (6.80±0.15) g·kg^-1 for H, (8.37±0.19) g·kg^-1 for N, and(7.82±0.22) g·kg^-1 for D. The total Fe contents decreased by 13.61% for H and 2.30% for D, while increased by 2.85% for N over control. The Fe²⁺ content decreased by 6.48% for N; and, Fe³⁺ contents increased by 4.10% for N, and decreased by 15.42% for H and 2.73% for D over control. A correlation analysis indicated that the carbon emission fromthe lots treated with C, N, and D significantly inversely correlated with the Fe³⁺ and total Fe contentsat(P < 0.01), whereas H, at P < 0.05.