Influence of water stress on growth and biomass allocation of dominant tree species in mixed forest of broad-leaved and Korean pine at Changbai Mountain

Abstract

Abstract: Pinus koraiensis,Fraxinus mandsurica,Juglans mandshurica,Tilia amurensis,the four dominant trees in the mixed forest of broad-leaved and Korean pine at Changbai Mountain,were investigated in terms of their growth responses to different water treatments.The water content were 85% ～100%(CK),65%～85% (MW) and 45%～65%(LW) of field water-holding capacity.The results showed that soil water content had significant effect on the growth indexes such as single leaf area,dry weight of single leaf,number of leaves,dry weight of shoots and root length,etc.However,the responses of tested species to different water stresses were different.Under medium water stress,the ratio values of under-ground biomass/above-ground biomass for P.koraiensis and F. mandsurica increased by 79.31% and 23.91%, compared with that of CK.Whereas,the ratios for J. mandshurica and T. amurensis decreased by 42.32% and 7.92%,respectively.Only P. koraiensis species had high ratio of under-ground biomass/above-ground biomass under severe water stress.Therefore,P. koraiensis was the most drought-tolerant species among the tested tree species, and F. mandsurica only adapted to medium water stress,while J. mandshurica and T.amurensis were unfit for growing in drought conditions.

Key words: Flooding, Disturbance, Interspecific relationships, Association, Co variation, Songnen Steppe

CLC Number:

Q945

XIAO Dongmei, WANG Miao, JI Lanzhu. Influence of water stress on growth and biomass allocation of dominant tree species in mixed forest of broad-leaved and Korean pine at Changbai Mountain[J]. cje, 2004, (5): 93-97.

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