首页|Importance of soil moisture and N availability to larch growth and distribution in the Arctic taiga-tundra boundary ecosystem, northeastern Siberia

Importance of soil moisture and N availability to larch growth and distribution in the Arctic taiga-tundra boundary ecosystem, northeastern Siberia

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  • NETL
  • NSTL
  • Elsevier
To better understand the factors controlling the growth of larch trees in Arctic taiga-tundra boundary ecosystem, we conducted field measurements of photosynthesis, tree size, nitrogen (N) content, and isotopic ratios in larch needles and soil. In addition, we observed various environmental parameters, including topography and soil moisture at four sites in the Indigirka River Basin, near Chokurdakh, northeastern Siberia. Most living larch trees grow on mounds with relatively high elevations and dry soils, indicating intolerance of high soil moisture. We found that needle δ~(13)C was positively correlated with needle N content and needle mass, and these parameters showed spatial patterns similar to that of tree size. These results indicate that trees with high needle N content achieved higher rates of photosynthesis, which resulted in larger amounts of C assimilation and larger C allocation to needles and led to larger tree size than trees with lower needle N content. A positive correlation was also found between needle N content and soil NH_4~+ pool. Thus, soil inorganic N pool may indicate N availability, which is reflected in the needle N content of the larch trees. Microtopography plays a principal role in N availability, through a change in soil moisture. Relatively dryer soil of mounds with higher elevation and larger extent causes higher rates of soil N production, leading to increased N availability for plants, in addition to larger rooting space for trees to uptake more N.

Carbon and nitrogen isotopesSoil inorganic nitrogen poolTopographyVegetation changePhotosynthesis

Maochang Liang、Atsuko Sugimoto、Shunsuke Tei、Ivan V. Bragin、Shinya Takano、Tomoki Morozumi、Ryo Shingubara、Trofim C. Maximov、Serguei I. Kiyashko、Tatiana A. Velivetskaya、Alexander V. Ignatiev

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Graduate School of Environmental Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan

Graduate School of Environmental Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan,Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan

Graduate School of Environmental Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan,National Institute of Polar Research, Tokyo 190-0014, Japan

Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan,Far East Geological Institute, FEB RAS, Vladivostok 690022, Russia

Institute for Biological Problem of Cryolithozone, Siberian Division of Russian Academy of Science, 41 Lenin Avenue, Yakutsk 678891, Russia,North-Eastern Federal University, 58 Belinskogo St., Yakutsk 677000, Russia

A. V. Zhirmunsky Institute of Marine Biology, FEB RAS, Vladivostok 690041, Russia

Far East Geological Institute, FEB RAS, Vladivostok 690022, Russia

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2014

10.1016/j.polar.2014.07.008

Polar science

Polar science

SCI
ISSN：1873-9652
年,卷(期)：2014.8(4)
  • 20
  • 64