GROWTH AND CARBON ECONOMY OF A FAST-GROWING AND A SLOW-GROWING GRASS SPECIES AS DEPENDENT ON ONTOGENY

被引:86
作者
POORTER, H
POTHMANN, P
机构
[1] Department of Plant Ecology and Evolutionary Biology, University of Utrecht, Utrecht, 3508 TB
关键词
GROWTH ANALYSIS; INTERSPECIFIC VARIATION; ONTOGENIC DRIFT; PHOTOSYNTHESIS; RESPIRATION;
D O I
10.1111/j.1469-8137.1992.tb01069.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
In previous experiments systematic differences have been found in the morphology, carbon economy and chemical composition of seedlings of inherently fast- and slow-growing plant species. The present experiment was to investigate whether these differences persist when plants become larger. Plants of the inherently fast-growing Holcus lanatus L. and the inherently slow-growing Deschampsia flexuosa (L.) Trin. were grown under standardized conditions and growth, photosynthesis, respiration and carbon and nitrogen content were followed over a period of 4 to 7 weeks. Differences in relative growth rate were mainly due to the higher leaf area ratio (leaf area: plant weight) of the fast-growing species. Rates of photosynthesis differed substantially when expressed on a leaf weight basis, but only slightly when expressed per unit leaf area. Although most parameters showed some ontogenetic drift, differences found for young seedlings persisted at least until plants reached a dry weight of circa 3 g. Therefore, at least for these two species, the conclusions based on interspecific variation in relative growth rate of young seedlings apply to larger plants as well.
引用
收藏
页码:159 / 166
页数:8
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