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The Allometry Of Transpiration Rate And Leaf Traits With Plant Size Of Herbaceous Species

Posted on:2018-07-21Degree:MasterType:Thesis
Country:ChinaCandidate:G H FanFull Text:PDF
GTID:2310330539465115Subject:Ecology
Abstract/Summary:PDF Full Text Request
Based on the pot experiment,this research used allometric analysis to study the relationships among transpiration,leaf traits and the individual size of typical 40 species in Songnen Grassland.On this basis,the assumptions and predictions of Geometric Similarity Model(GEOM)and WBE model are evaluated,and the reason of controversy about predictions of GEOM and WBE models are researched.The main conclusions are as follows:1.The results showed that there were significant allometric relationships among plant transpiration vs.the individual size.At the intraspecific level,changes in transpiration vs.difference traits(eg.total biomass,stem biomass,shoot volume,and shoot length)were significant difference.Due to the difference among species,the relationship of transpiration vs.toal biomass at the interspecific level was not conformed to prediction exponent of 2/3 and 3/4 in the GEOM and WBE model.The relationship of transpiration vs.stem biomass was not conformed to the GEOM model's prediction exponent,but conformed to the WBE model's prediction exponent.The relationship of transpiration vs.shoot volume was not conformed to the GEOM and WBE model's prediction exponent.The relationship of transpiration vs.shoot length was close to the exponent 1.2.At the intraspecific level,there were significant allometric relationships between plant transpiration and leaf traits.Due to the species' influence at the interspecific level,the relationships of transpiration vs.leaf traits were not conformed to the GEOM and WBE model's prediction exponent.3.The relationship of tissue density vs.stem biomass was not conformed to the-3/4 at the intraspecific level,but conformed to the-3/4 at interspecific level.The relationship of tissue density and shoot volume was significant difference at the intraspecific level,but was not accorded with the WBE model's assumption at the interspecific level.This indicates that the total volume of shoot changes significantly with the change of individual size.4.The relationship of leaf biomass and mean leaf mass vs.individual size were allometry.That is to say,the plant terminal unit is associated with individual size.5.At the intraspecific level,there were significant allometric relationships of leaf number vs.total biomass/leaf area.But they were conformed to the GEOM model's prediction exponent 2/3 at the interspecific level.At the intraspecific level,there were significant allometric relationships of leaf number vs.stem biomass and shoot length.But they were not accored with the GEOM and WBE model's prediction exponent at the interspecific level.6.At the intraspecific level,there was significant allometric relationship of leaf area vs.leaf number.But the relationship of leaf area vs.leaf number was close to the exponent 1.At the intraspecific level,there were significant allometric relationships among leaf area,stem biomass,shoot volume and shoot length.Because of the species' influence at the interspecific level,the relationship of leaf area vs.leaf number was not conformed to the GEOM or WBE models' prediction.7.In total,due to special biology properties of each species the allometric constant for different properties are also different.The allometric exponent at the interspecific level altered significantly when the results from all species were analyzed uniformly,which is the fundamental cause for argument of metabolic theory ecology.Meanwhile,the two core hypothesis of metabolic theory ecology,namely,the tissue density and life size of plant changed,were also wrong,leading to charge deviation of subsequent derivation and extensional application for metabolic theory ecology.
Keywords/Search Tags:WBE model, GEOM model, Transpiration, Bulk tissue density, Leaf size
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