Abstract:In order to clarify the effect of acid rain on soil carbon (TC), nitrogen (TN), phosphorus (TP) content, and ecological stoichiometry characteristics, taking the paddy field in Fuzhou Plain as the research object, setting the control (CK), simulated acid rain(pH 2.5, 3.5, 4.5) treatment in the early rice and late rice growth period, the TC, TN and TP contents in paddy soil of Fuzhou Plain were measured and analyzed under the influence of acid rain. The results showed that the TC, TN, and TP contents in the soil under the acid rain treatments were higher than those in the CK (P<0.05). The average TC content in the soil at the maturity stage was lower than that at the greening stage and the jointing stage (P<0.01). The average TN content of each treatment in soil at the jointing stage of rice was less than that at the regreening stage and maturity stage (P<0.01). The average soil TP content at maturity stage was less than that at regreening stage and jointing stage (P<0.01). During the whole growth period, the C/N, C/P, and N/P ratios in the soil under acid rain treatment ranged from 7.87~10.86, 8.38~9.91 and 0.82~1.26, respectively. The C/N, C/P, and N/P ratios were smaller than that of the CK (P<0.05). Compared with early rice, the N/P ratio of late paddy decreased significantly, and the C/N, C/P, and N/P ratios were higher at the regreening stage than in the CK (P<0.05). The C/N ratio at jointing stage was higher than that at regreening and maturity stages (P<0.01). The difference of C/P ratio was not significant during the growth periods of early and late rice. The N/P ratio of each treatment at jointing stage of early and late rice was lower than that at regreening and maturity stages (P<0.01). In general, acid rain treatment increased soil carbon, nitrogen, and phosphorus contents in paddy soils, and the ecological stoichiometry characteristics in paddy soils was also significantly affected by acid rain, moreover, appeared obviously growth period variation.