Nutrient Characteristics of Soil Aggregates in Larix gmelinii Plantations of Different Forest Ages from Seriously Burned Area in Great Khingan Mountains

Abstract

[Objective] In order to know the changes of nutrient content and distribution of soil aggregates under Larix gmelinii plantation of different forest ages after vegetation restoration in severely burned areas of Greater Khingan Mountains. [Methods] Takes the Larix gmelinii plantation (11, 21 and 32 years) planted in 1989, 2000 and 2010 on the severely burned areas formed by the severe forest fire in Greater Khingan Mountains in 1987 as the research object. By measuring the contents of organic carbon, total nitrogen, total phosphorus, alkali-hydrolyzed nitrogen, available phosphorus and available potassium in soil aggregates, the nutrient distribution characteristics of soil aggregates were studied. [Results] (1) The contents of organic carbon, total nitrogen, total phosphorus, alkali-hydrolyzed nitrogen and available potassium in soil aggregates of different particle sizes increased gradually with the decrease of particle size, and the content of 0.25 mm fraction content (p < 0.01). [Conclusion] The nutrient of soil aggregates in Larix gmelinii plantation showed surface aggregation. The nutrient content of soil aggregates in Larix gmelinii plantations planted on severely burned areas in Greater Khingan Mountains increased with the increase of forest age. The Larix gmelinii plantation planted for 32 years significantly increased the nutrient content of soil aggregates. The results provide a scientific basis for the restoration of artificial vegetation in the severely burned area of Greater Khingan Mountains.

Keywords

• greater khingan mountains
• larix gmelinii plantation
• burned area
• aggregate nutrients