Effects of yearly simulated temperature rise and nitrogen deposition on soil nutrient in the Songnen meadow steppes of northeast China

摘要

Soil is the largest carbon store in terrestrial ecosystems.Effects of global environmental change on soil carbon and nutrient cycling are consequently an area of intense research interest ( Mosier, 1998 ).Nutrinet cycling is inherently couples with soil C cycling (Lal,2004).The objectives of this study were (1) to quantify the effects of soil heating and N deposition on soil total N ( TN), soil total P ( TP), available N ( AN), and available P ( AP) ; ( 2 ) to understand how the soil nutrient processes and functions of the Songnen meadow steppes respond to a single year of warming and increased N deposition, and to evaluate the potential consequences of climate change.