Ecophysiological behavior ofArtemisia ordosica on the process of sand dune fixation |
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Authors: | Tatsuaki Kobayashi Ru-Tang Liao Shu-Qing Li |
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Institution: | (1) Department of Environmental Science and Landscape Architecture, Faculty of Horticulture, Chiba University, 271 Matsudb, Japan;(2) Department of Biology, Inner Mongolia University, Hubehaoto, China;(3) Foresiry and Desert Control Research Institute of the Yikezhao League, Dongsheng, Inner, Mongolia, China;(4) Present address: Faculty of Agriculture, Tottori University, 160 Tottori, Japan |
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Abstract: | The population structure and water relations ofArtemisia ordosica were studied at different stages of the sand dune fixation process. Vegetation coverage and biomass increased as the sand
dune fixation process progressed. In contrast, individual growth rate decreased in the late fixation stage. On fixed sand
dunes the modal age ofA. ordosica plants was higher and seedlings or saplings were rearely observed. On active sand dunes, settlement of seedlings was regulated
by sand mobility; that is, seedlings were observed only when sand mobility was below 10 cm per year. Leaf transpiration was
highest in active sand dunes. Stand transpiration in fixed sand dunes was lower than in semi-fixed sand dunes. These differences
in transpiration were related to a decrease in soil water availability, which was affected by the increase in the aeolian
fine soil component during the course of sand dune fixation. The reduction in soil water status and the cessation of sand
movement were considered to be important factors in the decline of theArtemisia ordosica community. |
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Keywords: | Artemisia ordosica population dynamics sand dune fixation soil water availability transpiration |
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