Relationship between root tip morphology and growth conditions across Macaranga and Shorea species in a tropical lowland forest of Peninsula Malaysia
Relationship between root tip morphology and growth conditions across Macaranga and Shorea species in a tropical lowland forest of Peninsula Malaysia
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DOI：
10.1007/s11104-022-05665-1
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发表时间：
2022-08
期刊：
影响因子：
4.9
通讯作者：
S. Ugawa;Wataru Kuninaka;Keisuke Hayata;Naoko Maruta;Syota Ohashi;Victoria Rika Kubota;Ahmad Rozita;K. Wan Rasidah
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文献类型：
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作者：
S. Ugawa;Wataru Kuninaka;Keisuke Hayata;Naoko Maruta;Syota Ohashi;Victoria Rika Kubota;Ahmad Rozita;K. Wan Rasidah
目的研究树种功能性状与生长条件的关系，为了解树种资源获取策略提供重要信息。本研究的目的是阐明根尖形态与生长条件之间的关系，并考虑到原始低地低地龙脑香林的系统发育差异。从光照条件、土壤物理性质、土壤氮素动态和根尖形态特征（比根尖长、比根尖直径和比根尖组织密度）等方面分析了它们之间的关系。光照强度和土壤氨化速率。考虑到属之间的差异，我们检测到种间变异SRLt，RDt，和RTDt在所有13种响应不同的环境因素，如光照强度，土壤物理性质，土壤硝化作用，氮矿化速率。在同一物种中，SRLt下降，随着光照强度的增加和硝化率的增加，而RDt表现出相反的trade.ConclusionWe确认，根尖形态根据热带树种的生长条件而变化：耐荫树种和/或树种生长在肥沃的条件下，根尖具有高效率的土壤勘探或开发每单位的根生物量。这种变异模式不同于温带树种。
AimsThe relationship between functional traits and growth conditions across tree species provides critical information for understanding resource acquisition strategy of each species. This study aims to elucidate the relationship between root tip morphology and growth conditions with considering the phylogenetic difference in a primary lowland dipterocarp forest.MethodsWe surveyed growth conditions for 13 target species ofMacarangaandShorea, i.e., light condition, soil physical properties, and soil nitrogen (N) dynamics, and root tip morphology, including specific root tip length (SRLt), root tip diameter (RDt), and root tip tissue density (RTDt) and analyzed their relationships considering the difference between genera.ResultsThe differences in SRLt and RDt between two genera,MacarangaandShorea, were validated by the difference in environmental factors, i.e., light intensity and soil ammonification rate. With considering the difference between genera, we detected an interspecific variation in SRLt, RDt, and RTDt across all 13 species in response to differences in environmental factors such as light intensity, soil physical properties, soil nitrification, and N mineralization rates. Among the same species, the SRLt decreased with increasing light intensity and increased with increasing nitrification rates, while the RDt exhibited an opposite trend.ConclusionWe confirmed that the root tip morphology varies according to growth conditions in tropical tree species: shade-tolerant tree species and/or tree species grown in fertile condition had root tips with high efficiency of soil exploration or exploitation per a unit of root biomass. This variation pattern was different than that of temperate tree species.