Timing of forest fine root production advances with reduced snow cover in northern Japan: implications for climate-induced change in understory and overstory competition
Timing of forest fine root production advances with reduced snow cover in northern Japan: implications for climate-induced change in understory and overstory competition
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DOI：
10.1007/s00442-021-04914-x
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发表时间：
2021-04
期刊：
影响因子：
2.7
通讯作者：
Karibu Fukuzawa;R. Tateno;S. Ugawa;Tsunehiro Watanabe;N. Hosokawa;Shogo Imada;H. Shibata
中科院分区：
文献类型：
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作者：
Karibu Fukuzawa;R. Tateno;S. Ugawa;Tsunehiro Watanabe;N. Hosokawa;Shogo Imada;H. Shibata
为了研究积雪减少对细根动态的影响，在日本北方的冷温带森林，因为在高纬度地区的降雪量减少，由于全球变暖，我们监测根长，生产和死亡率之前和之后的雪去除与地面根扫描仪。我们测量了两种主要树种的林上层落叶栎（皱叶栎）和林下层万年青矮竹（日本竹）的根系动态。除雪提前一个月的高峰根生产的时间都在总和inSasa，但不是在橡木。有一个显着的相互作用，除雪和植物的形式对根的生产，这表明，增强Sasaroot生产除雪后可能会增加其竞争能力与橡木。相比之下，除雪并没有提高根死亡率，这表明这些物种的根容忍土壤冻结。除雪区较早的积雪消失延长了萨萨的生长季节。我们推测，这种林下环境的变化将提前根生产的时间由Sasaby延长光合期在春季。我们认为，两个物种之间根系生产对积雪减少的不同反应将改变林上和林下植被的竞争相互作用，影响净初级生产力和土壤地球化学（例如，碳和氮循环）。
To investigate the effect of reduced snow cover on fine root dynamics in a cool-temperate forest in northern Japan because of decreases in snowfall at high latitudes due to global warming, we monitored root length, production, and mortality before and after snow removal with an in-ground root scanner. We measured root dynamics of both overstory deciduous oak (Quercus crispula) and understory evergreen dwarf bamboo (Sasa nipponica), the two major species in the forest. Snow removal advanced the timing of peak root production by a month both in total and inSasa, but not in oak. There was a significant interaction between snow removal and plant form on root production; this indicates that enhancedSasaroot production following snow removal might increase its ability to compete with oak. In contrast, snow removal did not enhance root mortality, suggesting that the roots of these species tolerate soil freezing. The earlier snow disappearance in the snow removal plot expanded the growing season inSasa. We speculate that this change in the understory environment would advance the timing of root production bySasaby extending the photosynthetic period in spring. We propose that different responses of root production to reduced snow cover between the two species would change the competitive interactions of overstory and understory vegetation, influencing net primary production and biogeochemistry (e.g., carbon and nitrogen cycles) in the forest ecosystem.