We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
六盘山半湿润区华北落叶松树干半径 变化特征及其影响因素.
- Authors
王亚蕊; 刘泽彬; 王彦辉; 熊 伟; 于澎涛; 徐丽宏; 马 菁
- Abstract
We measured stem radius of Larix principis-rupprechtii at the semi-humid Liupan Mountains using the automatic hand dendrometer over the growing season in 2016. We examined the diurnal and seasonal variations of stem radius, determined the main stem growth period, and analyzed the response of stem radius to environmental factors during the main stem growth period. The aim was to accurately understand the effects of short-term environmental variation on tree growth. The results showed that stem radius had a clear diurnal variation, with the phases of daytime shrin-kage, nighttime recovery, and increment. The seasonal variation of stem radius could he divided into three distinct stages, including stem relatively stable, stem continuous increasing, and stem swell-shrinking fluctuation. Under the meteorological, soil moisture and topographic conditions of 2016, main stem growth period of L. principis-rupprechtii started from 14th May and ended on the 31th July, with the maximum radius growth rate occurred on 8th June. The environmental factors influencing the daily radius shrinkage al different phases (shrinkage phase, daily, cycle) were generally the same, including temperature (including the air and soil temperature), solar radiation intensity, saturation vapor pressure deficit and soil water content. Temperature had the highest contribution (50.3%-71.0%) . However, the influencing factors of daily radius increment varied at different phases. Precipitation (with a contribution of 86. 9%) and maximum air temperature (13. 1%) were the influencing factors at the radius increment phase. Precipitation (50.3%), saturation vapor pressure deficit (29. 9%), relative humidity (12. 7%) and solar radiation intensity (7. 1%) were the factors at stem cycle. Precipitation and solar radiation intensity were the factors at diurnal scale. Radius increment was more sensitive lo environmental variation al the Lime of stem cycle than that al diurnal scale.
- Subjects
SATURATION vapor pressure; SOIL moisture; SOLAR radiation; SOIL temperature; ATMOSPHERIC temperature
- Publication
Yingyong Shengtai Xuebao, 2020, Vol 31, Issue 10, p3313
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202010.005