EFFECTS OF ATMOSPHERIC ELEVATED TEMPERATURE ON THE GROWTH,REPRODUCTION AND BIOMASS ALLOCATION OF RECLAMATION PHRAGMITES AUSTRALIS IN EAST BEACH OF CHONGMING ISLAND
A total number of 8 open top chamber (OTC) experiments were carried out in East Beach of Chongming Island of Shanghai in March 2008. The effects of elevated temperature (ET) on the growth,reproduction and biomass allocation of reclamation Phragmites australis were examined in November 2008. The results showed that plant height increased significantly,but the stem diameter did not change significantly in response to the ET. Leaf length,leaf width and leaf area increased significantly, the leaf length-width ratio and the leaf mass ratio (LMR) did not change significantly,and the leaf area ratio (LAR),the specific leaf area (SLA) decreased significantly under the ET compared with the control. We found that the individual number of flower, flowering rate, height of inflorescence,length of flower stalk, flower number and seed number deceased significantly under ET. Meanwhile, the ET inhibited P. australis reproduction. In addition,the biomass of different layers in aerial part,root,stem and leaf increased significantly,but the biomass of flower reduced significantly under the ET. But the effects of the ET on the biomass of different layers of root were different. The biomass of upper layer increased significantly,the middle layer decreased significantly,and the lower layer did not change significantly. We further found that the proportion root biomass and flower biomass decreased significantly,but the proportion of stem biomass and leaf biomass rose significantly under the ET.
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万方数据
维普
