Fine-root dynamics in sugi (Cryptomeria japonica) under manipulated soil nitrogen conditions

Noguchi, Kyotaro; Nagakura, Junko; Konôpka, Bohdan; Sakata, Tadashi; Kaneko, Shinji; Takahashi, Masamichi

doi:10.1007/s11104-012-1354-9

Cited by 31 publications

(20 citation statements)

References 43 publications

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“…Soil pH decreased in NF plots (from 5.5 to 4.5; Noguchi et al, 2013) and this, when considered together with the results of the present study, suggests that fertilization facilitated nitrification. In addition, the differences in NO 3 –N concentration between NF and control plots were more evident in the subsurface soil than in the surface soil.…”

Section: Discussionsupporting

confidence: 83%

“…A previous study at the same study site indicated that the elongation rate of fine roots <1 mm in diameter was higher and the residence time of the fine roots was longer in NF plots than in control plots (Noguchi et al, 2013). Thus, in the present study, the sugi trees likely responded positively to N fertilization by increasing the biomass and length of fine roots.…”

Section: Discussionmentioning

confidence: 92%

“…Among the 12 established plots, 10 (five fertilized and five control plots) were used for this study. Further information on the site characteristics and the design of the N-fertilization experiment can be found in Noguchi et al (2013) and Sakai et al (2010).…”

Section: Methodsmentioning

confidence: 99%

“…Although the N concentration in leaves was higher in the fertilized plots during first 3 years of the experiment, there was no significant effect on aboveground growth of the sugi trees. However, another study showed that 3-year N fertilization at the same rate to small plots (1 m × 2 m) significantly affected fine root dynamics (Noguchi et al, 2013). In that study, the elongation rates and residence time of fine roots increased with N fertilization, whereas stem growth was not significantly affected.…”

Section: Introductionmentioning

confidence: 99%

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Biomass and morphology of fine roots of sugi (Cryptomeria japonica) after 3 years of nitrogen fertilization

2013

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Increasing nitrogen (N) deposition may affect carbon and nutrient dynamics in forest ecosystems. To better understand the effects of N deposition, we need to improve our knowledge of N effects on fine roots (roots <2 mm in diameter), as they are a key factor in carbon and nutrient dynamics. In this study, we fertilized 1 × 2 m plots in a sugi (Cryptomeria japonica) stand (336 kg ha-1 y-1) for 3 years and evaluated the responses of the fine roots to high N load. After fertilization, the concentration of NO3–N in the soil of N-fertilized (NF) plots was five-times as large as that in the control plots and the effect was more remarkable in the subsurface soil than in the surface soil. The biomass of fine roots <2 mm in diameter appeared to be greater in the NF plots (88 ± 19 g m-2) than in the control plots (56 ± 14 g m-2), but this difference was not statistically significant. In both plots, 76% of the biomass was accounted for by fine roots that were <1 mm in diameter. In the surface soil, the specific root length of fine roots <1 mm in diameter was significantly greater, and the diameter of those fine roots was marginally smaller, in the NF plots than in the control plots. In addition, the concentration of N in fine roots <1 mm in diameter was marginally greater in the NF plots than in the control plots. There may have been increased production of thinner fine roots or increased root branching in the NF plots. This study suggests that, in general, high N load is likely to have positive effects on sugi in terms of fine root characteristics and the effects on fine-root morphology are more evident than the effects on fine-root biomass.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biomass and morphology of fine roots of sugi (Cryptomeria japonica) after 3 years of nitrogen fertilization

2013

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“…Third, N addition may decrease the possibility of nongrowing season fine root mortality and then increase nongrowing season soil Ra by altering growing season fine root morphology. The rate of fine root mortality was reduced by an increase in fine root diameter [6,33]. In the study site, fine root diameter during growing seasons significantly increased with N addition [23,32], which may increase the anti-interference ability of fine roots and decrease the possibility of nongrowing season fine root mortality, thus resulting in increased nongrowing season soil Ra.…”

Section: Effects Of N Addition On Nongrowing Season Soil Respiration mentioning

confidence: 87%

Short Legacy Effects of Growing Season Nitrogen Addition and Reduced Precipitation alter Soil Respiration during Nongrowing Season

Yan

Xing

Wang

et al. 2020

Forests

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The short legacy effects of growing season nitrogen (N) addition and reduced precipitation on nongrowing season soil respiration (Rs), autotrophic respiration (Ra), and heterotrophic respiration (Rh) are still unclear. Therefore, a field manipulative experiment to determine the responses of nongrowing season Rs and its components to growing season N addition and reduced precipitation was conducted in a temperate forest. The results show that growing season N addition and reduced precipitation significantly increased nongrowing season Rs by regulating the response of Ra and Rh. The combination of N addition and reduced precipitation also showed a much stronger effect on Rs and its components, but the magnitude and direction largely depended on the snowpack thickness. The effects of growing season N addition and reduced precipitation on nongrowing season Rs and its components were mediated by different sampling periods. N addition significantly decreased Rs by decreasing Rh in early winter and significantly increased Rs by increasing Ra in deep winter and late winter. All treatments decreased temperature sensitivity (Q10) of Rs and Rh. Our findings contribute to a better understanding of how nongrowing season Rs and its components will change under growing season N addition and reduced precipitation and could improve predictions of the future states of the soil C cycle in response to climate change.

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Temporal variability in fine root dynamics in relation to tree girth size in sub‐tropical sal (Shorea robusta) forests

2023

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In forest ecosystems, the rapid turnover of fine roots (≤2 mm in diameter) is a major pathway of carbon and nutrient flow from plants to the soil. This study was conducted to determine how fine root biomass (FRB), productivity (FRP) and turnover (FRT) are affected by site characteristics, seasonal variation, soil depth and tree girth size in sub‐tropical sal forest ecosystem. Four sites (S1, S2, S3 and S4) were established in the Bhabhar region of Nainital istrict, Uttarakhand, India within an elevational range of 405 and 580 m, and at each site, sal trees were categorized into five girth classes. Fine roots were sampled seasonally up to a depth of 60 cm and divided into three layers (0–20, 20–40 and 40–60 cm). FRB was significantly affected by tree girth size and decreased with increasing girth size, while the effect of tree girth on FRP and FRT was observed to be insignificant. Seasonal variation of FRB in all girth sizes showed a keen resemblance as the standing FRB reached its pinnacle during the rainy season and the bottom line in the winter season. Maximum FRB was reported for the uppermost, organo‐mineral‐rich soil depth (0–20 cm) at 1.0 m distance from the tree bole and decreased with increasing soil depth and distance from the tree bole while FRT showed a reverse trend. The present study provided a holistic outlook on variations in FRB, FRP and FRT and the impact of edaphic characteristics and tree girth on fine root dynamics in the sal forest ecosystem of Central Himalaya, India.

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Fine-root dynamics in sugi (Cryptomeria japonica) under manipulated soil nitrogen conditions

Cited by 31 publications

References 43 publications

Biomass and morphology of fine roots of sugi (Cryptomeria japonica) after 3 years of nitrogen fertilization

Biomass and morphology of fine roots of sugi (Cryptomeria japonica) after 3 years of nitrogen fertilization

Short Legacy Effects of Growing Season Nitrogen Addition and Reduced Precipitation alter Soil Respiration during Nongrowing Season

Temporal variability in fine root dynamics in relation to tree girth size in sub‐tropical sal (Shorea robusta) forests

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