The role of a few-layer TiOx surfactant: remarkably-enhanced succeeding radial growth and properties of ZnO nanowires

2016 ◽  
Vol 4 (40) ◽  
pp. 9569-9575 ◽  
Author(s):  
Yiming Wu ◽  
Yukun Wu ◽  
Chao Ma ◽  
Yanbo Zhang ◽  
Huaiyi Ding ◽  
...  
Keyword(s):  
Radial Growth ◽  
Zno Nanowires

Via coating a few layers of TiOx, the radial growth of ZnO NWs can be remarkably sped up with superior properties.

scholarly journals Tailoring the charge carrier dynamics in ZnO nanowires: the role of surface hole/electron traps

2012 ◽  
Vol 14 (9) ◽  
pp. 3075 ◽  
Author(s):  
Mingjie Li ◽  
Guichuan Xing ◽  
Lloyd Foong Nien Ah Qune ◽  
Guozhong Xing ◽  
Tom Wu ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Carrier Dynamics ◽  
Zno Nanowires ◽  
Electron Traps ◽  
Charge Carrier Dynamics

Formation Mechanisms of ZnO Nanowires: The Crucial Role of Crystal Orientation and Polarity

2013 ◽  
Vol 117 (40) ◽  
pp. 20738-20745 ◽  
Author(s):  
Sophie Guillemin ◽  
Laetitia Rapenne ◽  
Hervé Roussel ◽  
Eirini Sarigiannidou ◽  
Georges Brémond ◽  
...  
Keyword(s):  
Crucial Role ◽  
Crystal Orientation ◽  
Zno Nanowires ◽  
Formation Mechanisms

Stem growth responses of declining mature Abiesamabilis trees after tephra deposition from Mount St. Helens

1995 ◽  
Vol 25 (9) ◽  
pp. 1493-1502 ◽  
Author(s):  
Gerardo Segura ◽  
Thomas M. Hinckley ◽  
Chadwick D. Oliver
Keyword(s):  
Radial Growth ◽  
Stem Growth ◽  
Silver Fir ◽  
Growth Responses ◽  
Stem Analysis ◽  
Cross Sectional ◽  
Breast Height ◽  
Per Se ◽  
Mount St Helens

Stem analysis of mature Abiesamabilis (Dougl.) Forbes (Pacific silver fir) trees was used to analyze patterns of radial growth in areas of southwestern Washington where this species is experiencing a severe crown decline associated with heavy tephra deposition from the 1980 eruption of Mount St. Helens. Reductions in stem growth after 1980 appeared to be related to the severity of crown damage. The largest reductions in cross-sectional area increment exceeded 50% and extended along most of the stem. An increase in stem growth in the upper crown was common among declining trees. This zone coincided with a portion of the crown that has experienced vigorous and rapid growth since 1980. The role of this recovery zone on subsequent tree recovery is discussed. Decline or recovery of trees appeared independent of crown class per se. Reductions in radial growth of declining trees tended to be more pronounced at breast height, suggesting that estimations of whole-stem growth based on breast height measurements would overestimate growth losses.

scholarly journals Unravelling resilience mechanisms in forests: role of non-structural carbohydrates in responding to extreme weather events

2020 ◽  
Author(s):  
Ettore D’Andrea ◽  
Andrea Scartazza ◽  
Alberto Battistelli ◽  
Alessio Collalti ◽  
Simona Proietti ◽  
...  
Keyword(s):  
Climate Change ◽  
Radial Growth ◽  
Extreme Weather ◽  
Extreme Weather Events ◽  
Summer Drought ◽  
Drought Event ◽  
List Type ◽  
Weather Events ◽  
Late Frost

SummaryExtreme weather events are increasing in frequency and intensity due to global climate change. We hypothesized that these have a strong impact on the stem radial growth and the dynamic of non-structural carbohydrates (NSCs).In order to assess the effects on mature trees of a late frost occurred in spring 2016 and a drought event characterizing the summer 2017, we monitored the phenology, the radial growth and the dynamic of starch and soluble sugars in a Mediterranean beech forest.Growth was much more reduced by spring late frost than by summer drought, while NSCs dynamic was deeply involved in counteracting the negative effects of both events, supporting plant survival and buffering source-sink imbalances under such stressful conditions, resulting in a strong trade-off between growth and NSCs dynamic in trees.Overall, our results highlight the key role of NSCs on trees resilience to extreme weather events, confirming the relevant adaptability to stressful conditions. Such an insight is useful to assess how forests may respond to the potential impacts of climate change on ecosystem processes and to define how future management strategies can help adaptation of beech forests in the Mediterranean area.

Radial Growth of Scots Pine (Pinus sylvestris L.) under Inhibition

2021 ◽  
pp. 69-81
Author(s):  
Valery P. Ivanov ◽  
◽  
Sergey I. Marchenko ◽  
Dmitry I. Nartov ◽  
Leonid P. Balukhta
Keyword(s):  
Pinus Sylvestris ◽  
Scots Pine ◽  
Growth Rates ◽  
Radial Growth ◽  
Climatic Factors ◽  
Global Climate ◽  
Climatic Conditions ◽  
Administrative District ◽  
Growth Processes

Predicting tree growth processes is important due to the exceptional ecosystem role of forests, which carry out global climate regulation by sequestrating carbon, conserving drinking water, and providing habitat for living organisms. Trees are known to respond to any fluctuations in the environment. The research purpose is to identify weather and climatic factors that significantly affect the inhibition of growth of Scots pine (Pinus sylvestris L.) in conditions of constant moisture deficit. The studies were carried out in the eastern part of the Bryansk region within the territory the Bryansk administrative district, in the educational and experimental forestry of the Bryansk State Engineering and Technological University and the Styazhnovskoye forest district. Methods of dendrochronology were used to assess the response of 93 pine trees to fluctuations in the external environment by changing the width of annual rings (available anatomical feature of a tree) using indices of radial growth. An original approach was proposed to analyze the reasons for a sharp decline in the annual radial growth under the influence of temperature and precipitation. The years with abnormally low increments (1963, 1972, 1985, 2002 and 2010) were identified against the background of the weather-climatic situation for 5 years before and after the fall in growth. Similar dynamics of absolute values of radial increments and their indices was established, which is caused by fluctuations of natural factors, manifestation of hereditary traits, etc. Significant differences were revealed between the growth rates at average multiyear values of January, May and August air temperatures with growth rates in the years of abnormally low radial growth, which are observed in pine against the background of colder January and warmer May and August of the current year, as well as under the condition of warmer January of the previous year. At the same time, no significant role of precipitation was detected. The obtained data, expanding the idea of the features of growth processes and formation of annual increments in diameter of Scots pine in the conditions of changing climate at the turn of the 20th–21st centuries, allowed us to suggest a possible manifestation of physiological features of the species, the homeostasis optimum zone of which is located in the conditions of colder boreal climate. This information expands our understanding of the features of growth processes and formation of annual increments in diameter of Scots pine in changing climatic conditions.

Role of substrate on the dendroclimatic response of Scots pine from varying elevations in northern Scotland

2011 ◽  
Vol 41 (4) ◽  
pp. 822-838 ◽  
Author(s):  
A.K. Moir ◽  
S.A.G. Leroy ◽  
S. Helama
Keyword(s):  
Correlation Analysis ◽  
Scots Pine ◽  
Radial Growth ◽  
Water Levels ◽  
Western Coast ◽  
Climate Data ◽  
Temperature Growth ◽  
Influence Of Substrate ◽  
The Relationship

The influence of substrate was evaluated by comparing annual ring widths of Scots pine (Pinus sylvestris L.) with climate data at 13 new sites (five bog, three peat, and five soil), together with 17 previously studied soil sites in northern Scotland. Radial growth rates <1.0 and >1.5 mm·year–1 differentiate well between pine growing on bog and peat, respectively, highlighting the role of pine as a indicator of water levels in these environments. Scots pine chronologies from bog are shown to have a weak temperature–growth response and so limit potential in dendroclimatic reconstructions. However, correlation analysis shows temperature in January–February and July–August to be important determinants of the radial growth of Scots pine on soil. Moving correlation analysis indicates that the relationship between the radial growth of pine on soil near the altitudinal tree line and summer temperature (July–August) is time stable, despite an increase of temperature in northern Scotland. However, winter (January–February) temperature has become less limiting since the 1920s. Scots pine at some soil, bog, and peat sites have increased or developed correlation with October temperature since the 1940s, suggesting an extension of the growth season, particularly on the western coast of Scotland.

Growth of ZnO Nanowires by MOCVD: Fundamental Role of the Substrate

2019 ◽  
Vol 25 (8) ◽  
pp. 437-443 ◽  
Author(s):  
Céline Ternon ◽  
Germain Rey ◽  
Michel Labeau ◽  
Nicolas Thiré ◽  
Carmen Jimenez ◽  
...  
Keyword(s):  
Zno Nanowires
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