Effects of microhabitats and soil conditions on structuring patterns of nematode communities in Japanese cedar (Cryptomeria japonica) plantation forests under temperate climate conditions
Effects of microhabitats and soil conditions on structuring patterns of nematode communities in Japanese cedar (Cryptomeria japonica) plantation forests under temperate climate conditions
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DOI：
10.1016/j.soilbio.2020.108044
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发表时间：
2020-12
影响因子：
9.7
通讯作者：
Y. Kitagami;T. Tanikawa;Y. Matsuda
中科院分区：
文献类型：
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作者：
Y. Kitagami;T. Tanikawa;Y. Matsuda
在森林生态系统中，受非生物条件影响的生物因素对线虫群落的影响尚不完全清楚。低林下多样性的单一人工林为研究森林生态系统中线虫群落结构与环境因子的关系提供了一个理想的模式系统。本研究旨在阐明影响日本雪松林土壤线虫群落结构的决定性环境因素。从凋落物和土壤样品中收集线虫，从科或属水平对线虫进行形态鉴定，并将线虫划分为营养类群。在凋落物和土壤样品中，线虫分别被区分为40个(包括2个独特分类单元)和52个(包括14个独特分类单元)分类单元。微生境底物的变化在凋落物和土壤样本之间形成了截然不同的线虫组合。此外，从凋落物栖息地鉴定出的线虫是从土壤样本中鉴定出的线虫的子集。在两种样本类型中，食菌线虫和食菌线虫的比例都很高。草食性线虫是土壤样品中第三丰富的营养类群，但在凋落物样品中很少见。土壤中线虫群落结构受水分、C、N、菌丝和土壤pH的显著影响。PH最有可能通过改变微生物生物量间接影响土壤线虫的生态功能。我们的结果表明，微生境基质，即土壤和凋落物，对温带针叶林线虫群落格局有重要影响。此外，由于邻近土壤环境的高度空间异质性，土壤线虫组合也变得多样化。
The effect of biotic factors impacted by abiotic conditions on nematode communities is not fully understood in forest ecosystems. Monoculture forests with low understory diversity would provide an ideal model system to investigate the relationship between nematode community structure and environmental factors in forest ecosystems. The aim of this study was to clarify the determinant environmental factors shaping community structures of soil nematodes in Japanese cedar (Cryptomeria japonica) forests. Nematodes collected from litter and soil samples were morphologically identified at the family or genus level and divided into trophic groups. Nematodes were discriminated into a total of 40 (including 2 unique taxa) and 52 (including 14 unique taxa) taxa in litter and soil samples, respectively. Variation in microhabitat substrates created contrasting nematode assemblages between litter and soil samples. Moreover, nematodes identified from litter habitats were a subset of those from soil samples. Bacterivorous and fungivorous nematodes were present in high proportions in both sample types. Herbivorous nematodes were the third most abundant trophic group in soil samples, but were rare in litter samples. The nematode community structure in soils was significantly ordinated by water, C, N, hyphae, and soil pH. The pH is most likely to affect ecological function of soil nematodes indirectly by altering microbial biomass. Our results showed that microhabitat substrates, that is, soil and litter, have a crucial effect on nematode assemblage patterns in temperate coniferous forests. Moreover, soil nematode assemblages were diversified due to the high spatial heterogeneity of proximate soil environments.