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Study on the Relationship between Variation of Stem Diameter and Sap Flow about Ligustrun Lucidum

Author: TianZuoYang
Tutor: LiChunYou
School: Agricultural University of Hebei
Course: Ornamental Plants and Horticulture
Keywords: Ligustrum Stem diameter Sap flow Trunk and branches Growing season
CLC: S687
Type: Master's thesis
Year: 2011
Downloads: 32
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Abstract


In this paper, evergreen and deciduous tree species Ligustrum trees radial actigraph (dendrometer) and thermal dissipation sap flow measurement probe (TDP) measurement technology, the study by large leaves privet stem diameter changes with changes in stem sap flow relationship, draw characteristics of Ligustrum transpiration, as well as changes in the quantitative relationship of the Ligustrum stem diameter change and stem sap flow, providing a theoretical basis for the actual irrigation work. The main conclusions of the study are as follows: (1) the Ligustrum stem diameter sunny and cloudy weather conditions follow the contraction - expansion - variation of the growth, stem diameter indicators to better reflect the changes in meteorological factors. Under in consecutive rainy weather conditions, because of the trees own features lead to different plants in response to environmental differences, and different plant stem diameter variation is not obvious when increased rainfall stem diameter will dramatically reduce the precipitation Description rainy conditions main meteorological factors affecting stem diameter changes. (2) the the Ligustrum stem diameter changes in variation throughout the growing season to slow - fast - slow growth curve of the \Ligustrum throughout the growing season to undergo two growing period, respectively, by the end of June and mid-August, this time should be enhanced of Ligustrum moisture management, to better growth. (3) the Ligustrum sap flow rate variation in sunny and cloudy weather conditions rendered as a single peak curve, sap flow rate can make real-time response to changes in meteorological factors. Sap flow in rainy conditions, air temperature, air humidity, and photosynthetically active radiation changes, changes in precipitation and stem sap flow there is a certain relationship between sap flow rate suddenly reduce subsequent return to normal when precipitation began . (4) The the Ligustrum sap flow rate of annual change in the overall trend of gradually increasing. Ligustrum is an evergreen broad-leaved species, by the end of April to early May, the winter the leaves fall, affecting the rate of stem sap flow the sap flow rate is lower than in May, April, September, Ligustrum not quickly stop the growth and fallen leaves, sap flow rate is maintained at a certain level, but tree growth has slowed significantly. (5) has an inverse relationship between stem diameter and stem sap flow, can show the state of the growth of trees. The reaction plant macro changes stem diameter, stem diameter of the tree itself characterized the response to environmental change than sap flow rapidly, within a short time of stem sap flow rate good performance of tree growth status. To see changes in stem diameter can visually see the trees change in the year the growth process, only the performance of the tree of life activities activity sap flow, and not a direct reaction from the annual changes in stem diameter and stem sap flow rate the speed of growth of trees. (6) in fine weather conditions, the diurnal variation of stem diameter and stem sap flow with various meteorological factors significantly associated, but cloudy conditions stem sap flow rate to reflect real-time changes in meteorological factors. Throughout the growing season, stem diameter than the stem sap flow rate can better reflect the state of the growth of the trees for a long time, the early air temperature affect the growth of the main factors in tree growth to tree growth late photosynthetically active radiation into affect tree growth The main factors. (7) of Ligustrum trunk and branching flow of day changes are unimodal curve. The Ligustrum trunk and each branch of the liquid flow in the case of continuous sunny partial correlation coefficients were 0.837,0.364,0.761. Trees transpiration process, the greater the diameter of the branching trunk moisture more and therefore should be avoided in the tree trimming injury larger diameter branches, to avoid trees substantial dehydration leading to death. Point of view of the average liquid flow rate as well as the diameter of the trunk and branches of the trunk and branches, branches and branches 3 diameter is relatively large, to better reflect the laws of tree growth; branches 2 of the diameter of the smallest The variation is not obvious, the smaller the diameter of the branches lower responsiveness to environmental changes. Therefore, the installation of the instrument should be the large diameter of the branches to be installed.

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CLC: > Agricultural Sciences > Gardening > Ornamental Horticulture ( flowers and ornamental trees) > Ornamental trees in class
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