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大兴安岭森林沼泽类型与火干扰对土壤微生物群落影响
大兴安岭森林沼泽类型与火干扰对土壤微生物群落影响
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大兴安岭森林沼泽类型与火干扰对土壤微生物群落影响
大兴安岭森林沼泽类型与火干扰对土壤微生物群落影响

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大兴安岭森林沼泽类型与火干扰对土壤微生物群落影响
大兴安岭森林沼泽类型与火干扰对土壤微生物群落影响
Journal Article

大兴安岭森林沼泽类型与火干扰对土壤微生物群落影响

2016
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[目的]研究森林沼泽演替与火干扰条件下土壤微生物结构与多样性变化,为进一步揭示土壤微生物群落在森林沼泽保护与恢复中的作用提供依据。[方法]采用磷脂脂肪酸法与BIOLOG方法,研究大兴安岭南瓮河国家自然保护区内主要森林沼泽类型(兴安落叶松-狭叶杜香-藓类沼泽、兴安落叶松-兴安杜鹃-藓类沼泽、兴安落叶松+白桦-苔草沼泽)与2006年受不同火强度干扰沼泽(重度火烧的兴安落叶松-兴安杜鹃-藓类沼泽和中度火烧的兴安落叶松+白桦-苔草沼泽)土壤微生物群落特征,探讨沼泽主要发育阶段与火干扰强度对土壤微生物群落的影响。[结果]研究区域土壤微生物群落以16:00(16.29±5.62 nmol·g-1)、甲烷氧化菌(18:1ω8t)(9.89±8.61 nmol·g-1)与16:1ω7c(9.79±3.24 nmol·g-1)的微生物为优势种群。土壤微生物总PLFAs含量、革兰氏阳性菌(G+)中a15:0、i16:0、i17:0、革兰氏阴性菌(G-)中的cy19:0、真菌中的18:2ω6c、甲烷氧化菌(18:1ω8t)与森林沼泽发育阶段、火干扰明显相关(p〈0.05)。一般饱和直链脂肪酸/单烯饱和脂肪酸比(Sat/Mon)偏低,其比值随沼泽发育呈现增加趋势,受到火干扰后明显增加(p〈0.05);真菌/细菌比(F/B)与革兰氏阳性菌/革兰氏阴性菌(G+/G-)未随着沼泽发育呈现出规律性变化,其比值受火干扰后明显发生改变(p〈0.05)。土壤细菌与真菌对6类碳源的利用能力明显不同(p〈0.001),其中土壤细菌对α-D-Lactose与L-Threonine利用存在差异性(Fα-D-Lactose=2.87 p=0.080,FL-Threonine=3.00 p=0.078),土壤真菌对D-Mannitol、D-glucosaminic Acid利用存在差异性(FTween 80=2.75,p=0.088,FD-Mannitol=3.53 p=0.047,FD-glucosaminic Acid=4.67 p=0.022),但沼泽类型与火干扰未对土壤微生物功能多样性产生影响(p〉0.05)。[结论]土壤微生物量与沼泽发育阶段相关;沼泽发育与火干扰改变土壤微生物群落结构。土壤细菌与真菌对碳源利用方面具有选择性。
Publisher
中国林业科学研究院湿地研究所,北京,100091%黑龙江省林业监测规划院,黑龙江哈尔滨,150080%广西九万山国家级自然保护区,广西柳州,545300%大兴安岭林业集团公司农林科学研究院,黑龙江加格达奇,165000

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