| 试验林火干扰下兴安落叶松林土壤有效磷的时空变化 |
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| 引用本文： | 张韫,于悦,崔晓阳.试验林火干扰下兴安落叶松林土壤有效磷的时空变化[J].北京林业大学学报,2019,41(2):12-18. |
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| 作者姓名： | 张韫 于悦 崔晓阳 |
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| 作者单位： | 东北林业大学林学院，黑龙江 哈尔滨 150040 |
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| 基金项目： | 国家自然科学基金项目31570597国家重点研发计划2016YFA0600803 |
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| 摘 要： | 目的研究3种强度火干扰下兴安落叶松林土壤有效磷时间与空间的变化规律及其形成机制，旨在更好地认识火烧迹地恢复初期土壤有效磷营养生境特征，为火干扰森林生态系统恢复提供矿质营养方面的参考。方法以大兴安岭北部寒温带兴安落叶松林土壤有效磷为研究对象，采用网格法布设固定样地、土钻法采集土壤样品、硫酸-盐酸浸提法测定土壤有效磷含量，连续定点观测秋季林火点烧试验前后土壤有效磷含量的时空动态。结果林火干扰后:(1)轻度火烧区土壤有效磷含量未立即发生显著变化而后逐渐升高；中、重度火烧区土壤有效磷含量立即升高而后持续增强；(2)火烧强度空间格局与土壤有效磷含量空间格局在火烧后各时段均极显著相关，而与土壤有效磷含量变化率的相关性仅表现在火烧后即时阶段，在融雪季、雨季/生长季消失。结论大兴安岭北部兴安落叶松林火烧迹地改造和生态恢复初期，土壤有效磷含量升高有利于林地植被恢复。
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| 关 键 词： | 兴安落叶松林 试验林火 土壤有效磷 时空变化 |
| 收稿时间： | 2018-04-10 |
Temporal and spatial change patterns on soil available phosphorus under an experimental forest fire in Larix gmelinii forests |
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| Institution: | School of Forestry, Northeast Forestry University, Harbin 150040, Heilongjiang, China |
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| Abstract: | ObjectiveThe temporal and spatial change patterns and its formation mechanism on soil available phosphorus were analyzed in the Larix gmelinii forests, which was disturbed by 3 kinds of intensity fire, to understand soil available phosphorus habitat and to provide reference to mineral nutrition regulation in the early vegetation restoration after forest fire.MethodTaking soil available phosphorus as research object, latticed co-coupled sampling method, soil-drilling method, and H2SO4-HCl extraction method were conducted to investigate temporal and spatial variations of soil available phosphorus under an autumn experimental forest fire in the boreal Larix gmelinii forests of Great Xing'an Mountain of northeastern China.ResultAfter forest fire disturbance: (1) soil available phosphorus of mild burned area was not changed immediately and then increased, that of moderate burned area or severe burned area increased immediately and then increased continually; (2) significant correlation of spatial pattern was between soil available phosphorus and fire intensity at each post-fire time node, correlation of spatial pattern between soil available phosphorus change and fire intensity appeared immediately after the fire, but that disappeared after snowmelt season and rainy season/growing season.ConclusionIn the early years of post-fire forest transformation or ecological restoration, increased soil available phosphorus is advantageous to the forest vegetation restoration of Larix gmelinii forests in Great Xing'an Mountain of northeastern China. |
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