Search results for: Yuki Tsujii

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article

Leaf phosphorus fractions vary with leaf economic traits among 35 Australian woody species

Yuki Tsujii, Brian J. Atwell, Hans Lambers, Ian J. Wright

New Phytologist > 241 > 5 > 1985 - 1997

Adaptations of plants to phosphorus (P) deficiency include reduced investment of leaf P in storage (orthophosphates in vacuoles), nucleic acids and membrane lipids. Yet, it is unclear how these adaptations are associated with plant ecological strategies. Five leaf P fractions (orthophosphate P, P_i; metabolite P, P_M; nucleic acid P, P_N; lipid P, P_L; and residual P, P_R) were analysed alongside leaf...

article

Variations in the reproductive cycle of Bornean montane tree species along elevational gradients on ultrabasic and non‐ultrabasic soils

Yuki Tsujii, Shoko Sakai, Masayuki Ushio, Shin‐ichiro Aiba, more

Biotropica > 55 > 1 > 210 - 220

Although lowland tree species in the ever‐wet regions of Southeast Asia are characterized by the supra‐annual cycle of reproduction, the reproductive phenology of montane tree species remains poorly understood. In this study, we investigated the reproductive phenology of montane tree species using litter samples that were collected every 2 weeks from six rainforest sites, consisting of three elevations...

article

Phosphorus allocation to and resorption from leaves regulate the residence time of phosphorus in above‐ground forest biomass on Mount Kinabalu, Borneo

Yuki Tsujii, Shin‐ichiro Aiba, Kanehiro Kitayama, Emma Sayer

Functional Ecology > 34 > 8 > 1702 - 1712

The residence time of phosphorus (P) in trees is a consequence of plant adaptation to P deficiency, with longer P residence time on soils with low P availability. P residence time has been studied at the leaf or canopy level but seldom at the whole‐tree level. Whereas P residence time at the leaf or canopy level is largely determined by leaf longevity and the resorption of P before leaf abscission,...

article

A Study on the reserve margin and 10‐minute spinning reserve for wide‐area supply and demand control

Yuki Tsujii, Tsutomu Oyama

IEEJ Transactions on Electrical and Electronic Engineering > 15 > 5 > 809 - 815

As a countermeasure for supply and demand imbalance in case of high penetration of photovoltaic systems, wide‐area supply and demand control is considered. This is performed by adjusting the supply and demand balance by power exchange from areas with surplus reserve capacity to areas with insufficient reserve capacity using cross‐regional interconnection lines. By using our supply and demand control...

article

Phosphorus and nitrogen resorption from different chemical fractions in senescing leaves of tropical tree species on Mount Kinabalu, Borneo

Yuki Tsujii, Yusuke Onoda, Kanehiro Kitayama

Oecologia > 2017 > 185 > 2 > 171-180

Nutrient resorption, a process by which plants degrade organic compounds and resorb their nutrients from senescing tissues, is a crucial plant function to increase growth and fitness in nutrient-poor environments. Tropical trees on phosphorus (P)-poor soils are particularly known to have high P-resorption efficiency (PRE, the percentage of P resorbed from senescing leaves before abscission per total...

chapter

State estimation error detection system for online dynamic security assessment

Yuki Tsujii, Ken Edward Kawakita, Masatoshi Kumagai, Akira Kikuchi, more

2017 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT) > 1 - 5

2017 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT)

Online Dynamic Security Assessment (DSA) is a dynamical system widely used for assessing and analyzing an electrical power system. The outcomes of DSA are used in many aspects of the operation of power system, from monitoring the system to determining remedial action schemes (e.g. the amount of generators to be shed at the event of a fault). Measurement from supervisory control and data acquisition...

article

The population genomic signature of environmental association and gene flow in an ecologically divergent tree species Metrosideros polymorpha (Myrtaceae)

Ayako Izuno, Kanehiro Kitayama, Yusuke Onoda, Yuki Tsujii, more

Molecular Ecology > 26 > 6 > 1515 - 1532

Genomewide markers enable us to study genetic differentiation within a species and the factors underlying it at a much higher resolution than before, which advances our understanding of adaptation in organisms. We investigated genomic divergence in Metrosideros polymorpha, a woody species that occupies a wide range of ecological habitats across the Hawaiian Islands and shows remarkable phenotypic...

article

A quantitative analysis of phenotypic variations of Metrosideros polymorpha within and across populations along environmental gradients on Mauna Loa, Hawaii

Yuki Tsujii, Yusuke Onoda, Ayako Izuno, Yuji Isagi, more

Oecologia > 2016 > 180 > 4 > 1049-1059

Metrosideros polymorpha, a dominant tree species in the Hawaiian Islands, shows an extreme phenotypic polymorphism both across gradients of climatic/edaphic conditions and within populations, making it a potentially useful model species for evolutionary study. In order to understand how the phenotypic diversity is maintained within populations as well as across populations, we examined the...

article

Long‐term C, N and P allocation to reproduction in Bornean tropical rain forests

Kanehiro Kitayama, Yuki Tsujii, Ryota Aoyagi, Shin‐ichiro Aiba, more

Journal of Ecology > 103 > 3 > 606 - 615

Tropical rain forests in SE Asia are well known for the occurrence of supra‐annual synchronous reproductive events, masting. Answering the question how trees allocate carbon (C), nitrogen (N) and phosphorus (P) to such irregular but gregarious reproduction requires a long‐term observation. We conducted a 10‐year continuous monitoring of litterfall in eight tropical rain forests, which differ significantly...

article

Management of the Patients with Chronic Heart Failure; the Role for Nurses and Team Management

Yuki Tsujii

Journal of Cardiac Failure > 2013 > 19 > 10 Supplement > S112

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