Nitrogen Deposition May Benefit to Larix olgensis Root Soils

Atmospheric nitrogen deposition affects the health of forest ecosystems by altering soil microbial activity. However, effects addition levels, morphology and ecosystem type on whether is beneficial or detrimental to controver-sial, most studies have focused negative structure. Based this, this study conducted a four-year experiment (NaNO3) at two levels (10 20 kg N hm−2·yr−1) in understory Larix olgensis northeastern China properties, enzyme activities, analyze physi-cochemical properties correlation between them. The results showed that reduced pH increased NH4+-N NO3−-N contents, thus promoting activities Urease (Ure), Acid phosphatase (ACP) N-Acetamidoglucosidase (NAG) inhibiting activity Leucine aminopeptidase (LAP) soil, further improving diversity richness microorganisms increasing dominant taxa microorganisms. This may be due acidification caused nitrogen, which increases effectiveness moving direction, activity, making more suitable for growth acid-loving tree species L. olgensis. In general, favored development bacterial communities maintenance nutrient status, had positive effect status provide an important scientific basis adaptive management context global deposition.