Leaf‐litter nitrogen concentration in hinoki cypress forests in relation to the time of leaf fall under different climatic conditions in Japan

Inagaki, Yoshiyuki; Okuda, Shiro; Sakai, Atsushi; Nakanishi, Akira; Shibata, Shozo; Fukata, Hideki

doi:10.1007/s11284-009-0672-8

Cited by 11 publications

(5 citation statements)

References 31 publications

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“…In an experiment using 15 N tracer, it was observed that hinoki cypress preferred soil ammonium to nitrate [51]; the results suggested that the preference of nitrate is promoted in forests with high soil nitrate availability. Lower accumulation and rapid decomposition of organic horizon have been reported in hinoki cypress forest soils [47,52,53]; the results suggested rapid nitrogen release from organic horizon with a lower δ 15 N value. These findings indicate that nitrogen released from organic horizon and soil nitrate are the two possible nitrogen sources of the lower 15 N value of hinoki cypress trees.…”

Section: Plant Nitrogen Utilizationmentioning

confidence: 77%

“…The leaf litterfall of understory vegetation increased rapidly, and the proportion of understory vegetation to total leaf litter was 40% from the age of 44 to 46 years (Figure 2a). The mean proportion for understory vegetation was 15% in some hinoki cypress forests in western Japan [47]. This result suggests that the amount of leaf litter of understory…”

Section: Forest Productivitymentioning

confidence: 86%

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Age-Related Changes in Water and Nitrogen Utilization in Crop Trees and Understory Vegetation in a Hinoki Cypress Plantation Forest in Kochi City, Southern Japan

2022

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Age-related changes in water and nitrogen utilization of crop and understory vegetation in a hinoki cypress plantation forest were investigated from the age of 21 to 46 years in Kochi City, southern Japan. Nitrogen concentration in the leaf litter of hinoki cypress showed a decreasing trend with forest age. The leaf δ15N of hinoki cypress was related to a quadratic function and increased from the age of 21 to 26 years and then decreased to the age of 46 years. These results suggest that older hinoki cypress trees utilize soil nitrogen sources with lower δ15N values, and the competition for soil nitrogen with understory vegetation should be stronger. Carbon isotope discrimination (Δ13C) of hinoki cypress decreased from the age of 21 to 30 years and then increased to the age of 46 years. In contrast, the intrinsic water-use efficiency (iWUE) of hinoki cypress increased from the age of 21 to 36 years and then decreased to the age of 46 years. These findings suggest that hinoki cypress trees in the earlier time increased their iWUE by reducing stomatal opening. In the earlier time, the stomatal opening of understory vegetation increased due to higher soil water availability with decreasing stand density of crop trees. In the later time, the iWUE of hinoki cypress decreased due to lower photosynthetic capacity with nitrogen limitation. These results suggest that the increase in the iWUE of hinoki cypress in response to elevated atmospheric carbon dioxide levels should be smaller in the later time because of stronger competition with understory vegetation for soil nitrogen resources.

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Section: Plant Nitrogen Utilizationmentioning

confidence: 77%

Section: Forest Productivitymentioning

confidence: 86%

Age-Related Changes in Water and Nitrogen Utilization in Crop Trees and Understory Vegetation in a Hinoki Cypress Plantation Forest in Kochi City, Southern Japan

2022

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“…For litter quality, the C/N ratio or nitrogen concentration in litter is an index of decomposability of litter in the initial stage (Berg and McClaugherty 2003). Inagaki et al (2010) have reported leaf-litter nitrogen concentration was not related to mean annual precipitation. The result suggests that decomposability of litter should not be high in high precipitation areas.…”

Section: Effect Of Climate Conditionsmentioning

confidence: 93%

“…First, the quantity and quality of litterfall can affect carbon and nitrogen content in the organic layer. Inagaki et al (2010) studied leaf litterfall in Kochi and Kyoto prefectures and found that the leaf-fall rate in high precipitation areas was similar to that in low precipitation areas. Therefore, litter production should not decrease with increasing mean annual precipitation.…”

Section: Effect Of Climate Conditionsmentioning

confidence: 99%

Soil properties and nitrogen utilization of hinoki cypress as affected by strong thinning under different climatic conditions in the Shikoku and Kinki districts in Japan

Inagaki

Nakanishi

Fukata

2011

Journal of Forest Research

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The effect of climate conditions and strong thinning on the soil organic layer, surface soil, and nitrogen and water utilization by plants was evaluated for hinoki cypress forests in Shikoku and Kinki districts in Japan. Thirty-five forests were selected in Kochi, Ehime, Kagawa and Kyoto prefectures. The mean annual temperate of the studied forests ranged from 9.6 to 16.3°C, and the mean annual precipitation ranged from 1,350 to 3,960 mm. Carbon and nitrogen content in the organic layer decreased with increasing mean annual precipitation. In high precipitation areas, carbon and nitrogen content in the organic layer would be lower due to rapid decomposition with low soil acidity and due to loss of litter because of heavy rainfall. Carbon and nitrogen content in the surface soil at 0-5 cm depth decreased with increasing mean annual temperature, but was not related to mean annual precipitation. The results indicate that loss of organic layer by raindrops in a high precipitation area causes lower nitrogen availability for plants. Strong thinning significantly reduced carbon and nitrogen content in the organic layer but did not affect nitrogen concentration and d 13 C in leaves. These results suggest that climate conditions and strong thinning can affect carbon and nitrogen content in the organic layer and subsequent nitrogen availability in soil, but strong thinning does not appreciably affect nitrogen and water utilization by hinoki cypress.

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“…Forest D was located at an altitude of 1150 m (33°28ʹN, 133°0ʹE) and is classified as an Andosol. The sites and soil characteristics were described in detail by Tanaka et al (2008), Sawada et al (2009) andInagaki et al (2010). Freshly collected soil samples were sieved to 2 mm and stored at field moisture at 5°C until use.…”

Section: Soilsmentioning

confidence: 99%

Potential nitrogen immobilization as influenced by available carbon in Japanese arable and forest soils

Sawada

Funakawa

Toyota

et al. 2015

Soil Science and Plant Nutrition

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Microbial nitrogen (N) immobilization following the addition of organic materials to soils regulates soil N availability, which affects plant growth and N leaching from soils. In this study, the potential for microbial N immobilization was evaluated by short-term incubation experiments following the addition of available carbon (C) under non-limiting conditions of N and phosphorus (P) to seven Japanese arable and forest soils. Glucose was added as a model substrate at concentrations close to microbial biomass C. The forest soils had lower pH and smaller increases in respiration rates after the glucose addition, and higher organic and biomass C compared to the arable soils. Microbial N immobilization, estimated by net decreases in extractable N, was significantly correlated with the concentrations of added glucose and was on average 43 mg N g −1 glucose C during 3-and 7-day incubation for all soils. Net increases in biomass N measured by the chloroform fumigation-extraction method using the common conversion factor of 0.54 at 3 and 7 days after the glucose addition were lower than the microbial N immobilization for all soils, and the biomass N accounted for a smaller portion of immobilized N in the arable soils than in the forest soils. Therefore, the present study suggests that microbial N immobilization would be dependent on the concentrations of available C in organic materials and higher than the increases in biomass N, especially for arable soils when organic materials are added to soils under non-limiting conditions of N and P.

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Leaf‐litter nitrogen concentration in hinoki cypress forests in relation to the time of leaf fall under different climatic conditions in Japan

Cited by 11 publications

References 31 publications

Age-Related Changes in Water and Nitrogen Utilization in Crop Trees and Understory Vegetation in a Hinoki Cypress Plantation Forest in Kochi City, Southern Japan

Age-Related Changes in Water and Nitrogen Utilization in Crop Trees and Understory Vegetation in a Hinoki Cypress Plantation Forest in Kochi City, Southern Japan

Soil properties and nitrogen utilization of hinoki cypress as affected by strong thinning under different climatic conditions in the Shikoku and Kinki districts in Japan

Potential nitrogen immobilization as influenced by available carbon in Japanese arable and forest soils

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