Relationship between Pruning Period of Pine and Cypress Tree Species and Flowing Pine Resin in Beijing Area
Using five tree species,including Pinus tabuliformis Carrière,Pinus bungeana Zucc.ex Endl.,Pinus armandii Franch.,as well as Platycladus orientalis(L.)Franco and Juniperus chinensis Roxb.,different diameters,stump retention,and branch pruning were selected at different times of the year to explore the relationship between pruning and resin flow,and determine the appropriate pruning period.The results showed that the suitable pruning period for the three tree species of Pinus tabuliformis Carrière,Pinus bungeana Zucc.ex Endl.,Pinus armandii Franch.was from mid December to mid Feb-ruary of the following year,while the suitable pruning period for Platycladus orientalis(L.)Franco and Juniperus chinensis Roxb.was from mid November to mid March of the following year;There is no signifi-cant correlation between branch diameter,pile retention,and resin flow;There is a significant difference in the flow of pine resin from the branches of pine and cypress trees.After cutting off the branches,pine resin flows out from the cutting edges of three tree species:Pinus tabuliformis Carrière,Pinus bungeana Zucc.ex Endl.,Pinus armandii Franch..However,there is no resin flow out from the cutting edges of Platycladus orientalis(L.)Franco and Juniperus chinensis Roxb..
BeijingPruning periodPine resinPine and cypress tree species
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