Effects of Simulated Acid Rain on Soil Enzyme Activity and Related Chemical Indexes in Woodlands

In order to explore the effects of different concentrations acid rain on soil nutrient content and utilization efficiency, provide a basis for an improvement in acidified regions, year-long experiment was conducted typical evergreen broad-leaved forest coniferous mixed Jinyun Mountain Chongqing. Four pH treatments (pH 4.5, 4.0, 3.25, 2.5) were established simulate rain. The results showed that: (1) Acid promoted accumulation nutrients, contents organic carbon (SOC), total nitrogen (TN), hydrolyzed (HN) significantly increased during (p < 0.05). (2) Soil SOC positively correlated with concentration 0.01), HN negatively concentration, TN phosphorus (TP) not concentration. (3) activities sucrase, urease, phosphatase 0.01) activity cellulase 0.01). (4) enzyme changed differently, depending study period. (5) According RDA analysis, had significant Conclusions: did alter overall but reduced available seriously inhibited activity—most notably, enzymes involved efficiency.