摘要
理论预测植物多样性与土壤理化因子共同影响土壤微生物多样性时空变化.大量研究发现,植物物种多样性与土壤微生物多样性之间相关性不强.本研究在青藏高原高寒草甸三个研究点,调查了4个不同生境植物群落组分种的关键功能性状,分析了土壤细菌多样性变化与植物群落功能组成(群落水平性状值)和结构(性状多样性)变异间的关系.结果表明,土壤细菌优势类群分布因生境而异;但总体上植物群落水平性状和性状多样性变异能解释土壤细菌多样性变化,其解释量(46%)与土壤理化因子所解释相当;土壤细菌多样性随植物群落水平的高度、比叶面积和叶片磷含量及其多样性的增大而增加,与群落水平叶片干物质含量呈负相关关系.研究结果支持植物群落功能属性变异能解释土壤微生物多样性变化的理论预测,为理解土壤微生物多样性的形成和变化机制提供了新视角.
The interaction between plant diversity and soil physicochemical factors has been predicted to influence the variation in soil microbial diversity across space and time;however,only limited robust evidence has been found to support this prediction at broad scale.We examined the relationships between plant community functional attributes(i.e.,community-weighted mean(CWM)and functional trait diversity(FD))and soil microbial diversity in Tibetan alpine meadows under different environmental regimes.Soil bacterial diversity was weakly associated with plant species diversity but was significantly associated with both CWM and FD of five key functional traits,explaining nearly half of the variation in soil bacterial diversity.Soil bacterial diversity was positively associated with CWM and FD of plant height,leaf specific area,and leaf phosphorus but was negatively associated with CWM of leaf dry matter content.These results provide robust evidence supporting the theoretical prediction that the plant community functional attributes can explain variation in soil bacterial diversity.In addition,these results provide novel insights that could facilitate the understanding of the mechanisms of assembly of soil microbial diversity.
作者
赵兴鸽
张世挺
牛克昌
ZHAO XingGe;ZHANG ShiTing;NIU KeChang(School of Life Sciences,Nanjing University,Nanjing 210023,China;School of Life Sciences,Lanzhou University,Lanzhou 730000,China)
出处
《中国科学：生命科学》
CSCD
北大核心
2020年第1期70-80,共11页
Scientia Sinica(Vitae)
基金
国家自然科学基金(批准号:31870402)
中央高校基本科研业务费专项资金(批准号:020814380111)资助.
关键词
高寒草甸
土壤理化因子
群落构建
功能性状
功能组成
性状多样性
物种多样性
alpine meadow
soil factors
community assembly
functional traits
functional composition
trait diversity
species diversity
