Seasonal Dynamic Characteristics of Ammonium-nitrogen and Nitrate-nitrogen Contents in Soils in Temperate Forests
An experiment was conducted to study the seasonal dynamic characteristics of ammonium-nitrogen, nitrate-nitrogen and organic nitrogen in different soil layers (A0, A1 and B) of five forest types, Pinus koraiensis plantation, Larix sp. plantation, virgin Pinus koraiensis-Tilia amurensis mixed forests, virgin Pinus koraiensis-Betula costata mixed forests, and natural Betula platyphylla secondary forest by contrast analysis. Result showed that the seasonal trends of content change in ammonium-nitrogen and available nitrogen in the same forest type were identical, namely the lowest contents occurred in June and August, the highest one in September. Contents of ammonium-nitrogen and organic nitrogen decreased with the increase of soil depth. The content of nitrate-nitrogen with obvious temporal and spatial variations for different soil layers changed strongly with environmental change, and the seasonal trends of content change were significantly different. The seasonal dynamic trends of ammonium-nitrogen, nitrate-nitrogen and organic nitrogen in every soil layer of P. koraiensis plantation, P. koraiensis-T. amurensis mixed forests, and P. koraiensis-B. costata mixed forests were all similar.
NETL
NSTL
万方数据
维普
