南京林业大学学报（自然科学版）2024，Vol.48Issue(1)：147-154,8.DOI:10.12302/j.issn.1000-2006.202209021
火烧对兴安落叶松林土壤氮形态和含量的初期影响
Early effects of fire on soil nitrogen content and form in Larix gmelinii forests
摘要
Abstract
[Objective]This paper elaborated upon the changes in soil total nitrogen and mineral nitrogen(NH+4-N and NO-3-N)contents,the nitrogen form characteristics and their spatial patterns in lightly,moderately and severely burned areas,which comprehensively reflected the characteristics of soil nitrogen nutrition habitats during the early restoration period of burned forest areas in the Greater khingan Mountains.This study aimed to provide a reference for the renovation and ecological restoration of burned coniferous forests in cold temperate zones.[Method]In the Ledum palustre-Rhododendron simsii-Larix gmelinii forest,fixed sample plots were set up with the grid method,and the intensity of the forest fire was controlled by artificial ignition.Soil samples were collected by auger boring before and one year after burning.The soil total nitrogen,NH+4-N and NO-3-N contents were measured,the change rate of each index and the ratio of mineral nitrogen forms were calculated,and the spatial patterns were drawn.[Result]A year after the burning:(1)Soil total nitrogen content changed,and its change rate was divided into two stages.In the lightly and moderately burned areas,soil total nitrogen content increased.Its spatial pattern was not obviously correlated with the fire intensity spatial pattern,but its change rate spatial pattern was.In the severely burned area,the soil total nitrogen content decreased.The spatial and change rate spatial patterns were both negatively correlated with the fire intensity spatial pattern.(2)Soil NH+4-N content increased in all burned areas;its spatial and change rate spatial patterns were not obviously correlated with the fire intensity spatial pattern.(3)Soil NO-3-N content increased significantly;its spatial and change rate spatial patterns were both positively correlated with the fire intensity spatial pattern.(4)The soil nitrogen form showed evident NH+4-N dominance,but its dominance(the content ratio of NH+4-N to NO-3-N)was reduced.The ratio spatial pattern and change rate spatial pattern were negatively correlated with the spatial pattern of fire intensity.[Conclusion]During the early restoration period of burned areas in the Larix gmelinii forest,the change in soil nitrogen nutrition habitat did not constitute an obstacle to the restoration of native vegetation types;however,the decline of soil total nitrogen in the severely burned area may bring about the fall-off in nitrogen supply capacity in the long-term.关键词
兴安落叶松/林火/土壤氮/空间格局Key words
Larix gmelinii/forest fire/soil nitrogen/spatial pattern分类
农业科技引用本文复制引用
左壮,张韫,崔晓阳..火烧对兴安落叶松林土壤氮形态和含量的初期影响[J].南京林业大学学报（自然科学版）,2024,48(1):147-154,8.基金项目
国家自然科学基金项目(31570597). （31570597）
