A COMPARATIVE STUDY ON THE WATER PHYSIOLOGICAL ECOLOGY OF DIFFERENT PROVENANCES OF MASSON PINE
不同种源马尾松水分生理生态的比较研究

A comparative study was made on the characteristics of water rela-tion (e.g. transpiration rate, transpiration efficiency, water potential etc.)of 9 Masson pine provenances from July 1988 to January 1989. The resu-lts indicate that the characteristics of water relations have definite cor-relationship with the growth and have a relatively higher genetic stabili-ty. It is shown that the mechanism of drought-resistance of Masson pinemay be attributed to its good drought-avoidance and drought-tolerancebesides its strong water-absorbing ability. Owing to the above differences,the different provenances of Masson pine have the dissimilar drought-res-istance. It was further observed that good provenances of Masson pine(e.g.the provenances in southern zone) were characterized by lower transpira-tion rate and water saturation deficit, higher transpiration efficiency andcritical w.s.d. and higher drought-resistance, which result a less influe-nce of water stress on the growth and a higher increment. Consequently,the 9 provenances may be classified into 3 types and 5 sub-types on thebases of the characters of water relations, using the method of clusteranalysis.