Why does leaf nitrogen decline within tree canopies less rapidly than light? An explanation from optimization subject to a lower bound on leaf mass per area

Dewar, Roderick C.; Tarvainen, Lasse; Parker, Kathryn; Wallin, Göran; McMurtrie, Ross E.

doi:10.1093/treephys/tps044

Cited by 53 publications

(55 citation statements)

References 25 publications

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“…This study also showed clear differences in SLA across different species due to individual species characteristics (Table 3), and SLA was smaller for upper than lower canopy species in all plots. This is caused by the strong negative correlation between SLA and the amount of light, and is consistent with the results of shading experiments for seedlings or understory trees showing high SLAs [32][33][34][35][36]. In particular, the present study showed that S. alnifolias, which grew in the lower canopy in GN and the upper canopy in GRW, showed 55.7% difference in SLA (GN 297.7 cm −2 ·g −1 ; and GRW 191.2 cm −2 ·g −1 ).…”

Section: Temporal and Interspecific Variation Of Slasupporting

confidence: 86%

Effects of Temporal and Interspecific Variation of Specific Leaf Area on Leaf Area Index Estimation of Temperate Broadleaved Forests in Korea

Kwon

Kim

Jeon

et al. 2016

Forests

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This study investigated the effects of interspecific and temporal variation of specific leaf area (SLA, cm 2 ·g −1 ) on leaf area index (LAI) estimation for three deciduous broadleaved forests (Gwangneung (GN), Taehwa (TH), and Gariwang (GRW)) in Korea with varying ages and composition of tree species. In fall of 2014, fallen leaves were periodically collected using litter traps and classified by species. LAI was estimated by obtaining SLAs using four calculation methods (A: including both interspecific and temporal variation in SLA; B: species specific mean SLA; C: period-specific mean SLA; and D: overall mean), then multiplying the SLAs by the amount of leaves. SLA varied across different species in all plots, and SLAs of upper canopy species were less than those of lower canopy species. The LAIs calculated using method A, the reference method, were GN 6.09, TH 5.42, and GRW 4.33. LAIs calculated using method B showed a difference of up to 3% from the LAI of method A, but LAIs calculated using methods C and D were overestimated. Therefore, species specific SLA must be considered for precise LAI estimation for broadleaved forests that include multiple species.

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Section: Temporal and Interspecific Variation Of Slasupporting

confidence: 86%

Effects of Temporal and Interspecific Variation of Specific Leaf Area on Leaf Area Index Estimation of Temperate Broadleaved Forests in Korea

Kwon

Kim

Jeon

et al. 2016

Forests

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“…Norway spruce, Picea abies (L.) Karst., dominated the stand (82 % of the basal area, BA) but Scots pine, Pinus sylvestris L. (13 % of BA), and Silver birch, Betula pendula Roth (5 % of BA), were also present. The dominant and co-dominant Norway spruce trees were 22-25 m in height and the average LAI was 5.1 m 2 m −2 at the bottom of the living crown in May 2007 (Dewar et al 2012). The field vegetation was dominated by bryophytes with sparse vascular plants, including species such as Luzula pilosa and Oxalis acetosella.…”

Section: Site Descriptionmentioning

confidence: 99%

A fertile peatland forest does not constitute a major greenhouse gas sink

et al. 2013

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Abstract. Afforestation has been proposed as a strategy to mitigate the often high greenhouse gas (GHG) emissions from agricultural soils with high organic matter content. However, the carbon dioxide (CO 2 ) and nitrous oxide (N 2 O) fluxes after afforestation can be considerable, depending predominantly on site drainage and nutrient availability. Studies on the full GHG budget of afforested organic soils are scarce and hampered by the uncertainties associated with methodology. In this study we determined the GHG budget of a spruce-dominated forest on a drained organic soil with an agricultural history. Two different approaches for determining the net ecosystem CO 2 exchange (NEE) were applied, for the year 2008, one direct (eddy covariance) and the other indirect (analyzing the different components of the GHG budget), so that uncertainties in each method could be evaluated. The annual tree production in 2008 was 8.3 ± 3.9 t C ha −1 yr −1 due to the high levels of soil nutrients, the favorable climatic conditions and the fact that the forest was probably in its phase of maximum C assimilation or shortly past it. The N 2 O fluxes were determined by the closed-chamber technique and amounted to 0.9 ± 0.8 t C eq ha −1 yr −1 . According to the direct measurements from the eddy covariance technique, the site acts as a minor GHG sink of −1.2 ± 0.8 t C eq ha −1 yr −1 . This contrasts with the NEE estimate derived from the indirect approach which suggests that the site is a net GHG emitter of 0.6 ± 4.5 t C eq ha −1 yr −1 . Irrespective of the approach applied, the soil CO 2 effluxes counter large amounts of the C sequestration by trees. Due to accumulated uncertainties involved in the indirect approach, the direct approach is considered the more reliable tool. As the rate of C sequestration will likely decrease with forest age, the site will probably become a GHG source once again as the trees do not compensate for the soil C and N losses. Also forests in younger age stages have been shown to have lower C assimilation rates; thus, the overall GHG sink potential of this afforested nutrient-rich organic soil is probably limited to the short period of maximum C assimilation.

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“…(Vitousek et al, 2010), 흡수된 양분의 분배는 수관 내 양분 요구 도, 광의 분포 등에 영향을 받게 된다 (Dewar et al, 2012;Kobe et al, 2005;Niinemets, 2012). 또한 낙엽이 지기 전에 잎의 양분을 소지를 비롯한 영구조 직으로 재흡수하여, 양분의 이용효율을 높이는 재전류 는 토양의 비옥도, 광환경, 수종 및 천이 단계에 따라 영향을 받게 된다 (Kobe et al, 2005;Yan et al, 2006;Yan et al, 2013).…”

Section: 질소와 인은 식물체 내에서 단백질 핵산 엽록소를unclassified

“…1). 잎의 질소량과 그 분배는 흔히 빛의 양과 밀접한 양의 상 관관계를 가지며 (Dewar et al, 2012;Field, 1983;Hirose and Werger, 1987;Huang. J. et al, 2007;Niinemets, 2012;Peltoniemi et al, 2012) (Minotta and Pinzauti, 1996).…”

Section: Lma와 엽록소 함량unclassified

“…식물 의 환경에 대한 순응의 일환으로 식물은 양분의 흡수, 분배 그리고 재전류(retranslocation)를 효과적으로 수 행할 수 있는 전략이 필요하며, 이러한 전략의 부재는 그 식물의 환경에 대한 적응 능력을 저하시키고, 급기 야 자신이 처한 환경에서 도태되는 결과를 가져온다 (Killingbeck, 1996;Huang et al, 2007;Dewar et al, 2012).…”

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Nutrient Use Strategy of Carpinus cordata Saplings Growing under Different Forest Stand Conditions

Kwon¹,

Heo²,

Shin³

et al. 2014

Korean Journal of Agricultural and Forest Meteorology

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This study aimed to understand the nutrient absorption, usage and allocation of Carpinus cordata in different soil and light environments. Seasonal changes of foliar nitrogen, phosphorous, chlorophyll contents, leaf mass per area (LMA) and nutrient retranslocation rates were investigated for C. cordata saplings growing in a natural deciduous broadleaved forest and an Manchurian fir (Abies holophylla) plantation in Gwangneung, Kyunggido. The deciduous forest had lower leaf area, higher light penetration, and better soil fertility than the Manchurian fir forest. However, available soil phosphorous content in the deciduous forest was only one third of that in the Manchurian fir forest, which caused lower foliar phosphorous content and higher P retranslocation rate of C. cordata in the deciduous forest than that in the Mancurian fir forest. Soil nitrogen contents in the deciduous forest were higher than that in the Manchurian fir forest, however, no differences in foliar nitrogen content and retranslocation rate in C. cordata between the two stands were found. C. cordata in the Manchurian fir forest with high LAI throughout a year, had lower LMA, foliar nitrogen content and chlorophyll a/b, while had higher total chlorophyll content and chlorophyll/N than that in the deciduous forest. These results implied C. cordata under different environments are using different strategies for nutrient use and allocations.

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Why does leaf nitrogen decline within tree canopies less rapidly than light? An explanation from optimization subject to a lower bound on leaf mass per area

Cited by 53 publications

References 25 publications

Effects of Temporal and Interspecific Variation of Specific Leaf Area on Leaf Area Index Estimation of Temperate Broadleaved Forests in Korea

Effects of Temporal and Interspecific Variation of Specific Leaf Area on Leaf Area Index Estimation of Temperate Broadleaved Forests in Korea

A fertile peatland forest does not constitute a major greenhouse gas sink

Nutrient Use Strategy of Carpinus cordata Saplings Growing under Different Forest Stand Conditions

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