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Life span and biomass allocation of stunted black spruce clones in the subarctic environment
Author(s) -
Laberge MarieJosée,
Payette Serge,
Bousquet Jean
Publication year - 2000
Publication title -
journal of ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.452
H-Index - 181
eISSN - 1365-2745
pISSN - 0022-0477
DOI - 10.1046/j.1365-2745.2000.00471.x
Subject(s) - longevity , biology , black spruce , shrub , fragmentation (computing) , botany , subarctic climate , stipule , habit , biomass (ecology) , charcoal , life span , horticulture , ecology , taiga , chemistry , evolutionary biology , psychology , genetics , organic chemistry , psychotherapist
Summary 1 Slow growth, maintenance of a high leaf : wood ratio and adoption of a clonal growth habit, more than size per se , may increase the life span in trees species. The longevity of black spruce ( Picea mariana (Mill.) BSP.) is increased from 200 to 300 years, when it grows as a clonal shrub. 2 We measured the surface area and above‐ and below‐ground biomass of 25 postfire, stunted black spruce clones identified from RAPDs markers. The maximum age of each clone was deduced from tree‐ring dating or by radiocarbon dating of charcoal fragments. The oldest clone was > 1800 years of age. The total surface area of the clones increased with age, ranging from 2.8 to 691.3 m 2 . The ratio of living aerial parts to the total surface area decreased from 100% to < 50% with postfire stand age, reflecting fragmentation of clones into many autonomous or potentially autonomous rooted branches (layers). The number of layers increased with age from 12 layers in a 100‐year‐old individual to more than 80 in a 1800‐year‐old clone. 3 Biomass allocation and fragmentation can explain the maintenance of a relatively stable leaf : wood ratio of approximately 10% through time in stunted black spruce clones. The fragmentation of layers is the main mechanism ensuring the great longevity of prostrate clones in exposed sites. In the absence of perturbation, stunted black spruce clones may perpetuate for centuries or even millennia.