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Effects of sand burial on growth and photosynthesis and water metabolism of Pinus sylvestris var. mongolica saplings.

ZHAO Ha-lin1**, LI Jin1, ZHOU Rui-lian2, QU Hao1, YUN Jian-ying1, PAN Cheng-chen1   

  1. (1Cold and Arid Regions Environment and Engineering Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2Faculty of Life Sciences, Ludong University, Yantai 264025, Shandong, China)
  • Online:2014-11-10 Published:2014-11-10

Abstract: In order to assess the effects of sand burial on growth properties and photosynthesis and water metabolism of Pinus sylvestris var. mongolica saplings, the survival rate, plant height, aboveground biomass, photosynthetic rate (Pn), transpiration rate (Tr) and water use efficiency (WUE) of 3yearold P. sylvestris var. mongolica saplings with different sand burial depths were measured in the Horqin Sand Land of Inner Mongolia in the spring of 2013. The results showed that the maximum depth of the saplings to withstand sand burial should not exceed 2 cm above the plant height, and all saplings died when the sand burial depth was over 2 cm above the plant height. When the sand burial depth was below 2 cm above the plant height, sand burial promoted the height growth but did not benefit the biomass accumulation of the saplings, and significantly increased Pn, Tr, stomatal conductance (gs), and intercellular CO2 concentration (Ci), with a maximum increase of Pn,Tr, gs, respectively when the sand burial depth was at 50% of the plant height. Ci was the maximum when the sand burial depth was 2 cm above the plant height. Although the sand burial did not result in the decrease of water content in the saplings, WUE of the saplings tended to decline with increase of the sand burial depth, with the lowest WUE when the sand burial depth was 2 cm above the plant height. There was a significant and positive correlation between sapling height and Pn, Tr, between Pn and gs and Ci, and between WUE and plant water content and Tr. The correlation was not significant between the aboveground biomass and Pn and Tr.

Key words: Cephalopod, Sthenoteuthis oualaniensis, morphological indicators, population classification, fishery