Comparative study on stem sap flow of non-and ring-porous tree species

Abstract

Abstract: By the method of thermal dissipation,this paper studied the dynamic characteristics of the stem sap flow of Fraxinus mandshurica and Pinus sylvestris var.mongolica,the two major classes of wood anatomy,non-porous(coniferous) and ring-porous,at the Forest Ecosystem Research Station of Maoershan Mountain during growth season.Air temperature and relative humidity,soil moisture,and soil temperature were also measured.The results showed that on sunny days,the diurnal variation of sap flow density presented mono-peak pattern,mostly occurred from 9 AM to 14 PM.The maximum sap flow density was three times greater in F.mandshurica than in P.sylvestris var.mongolica.The ratio of sap flow quantity at nighttime to those in whole day was less than 20%,except in later autumn,indicating the effect of root pressure.After all leaves fallen till mid-October,there still existed sap flow.The seasonal average sap flow density was 48% higher in F.mandshurica than in P.sylvestris var.mongolica.Effective photosynthetic radiation and deficient vapor pressure were the dominant environmental variables affecting the diurnal variation of sap flow density on sunny days.

Key words: soil fertility, principal component, land use pattern, karst.

CLC Number:

Q948
S718.5

SUN Huizhen, LI Yiping, WANG Cui, ZHOU Xiaofeng. Comparative study on stem sap flow of non-and ring-porous tree species[J]. cje, 2005, (12): 1434-1439.

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