日本扁柏林中无机成分大气沉降的季节变化及冠层相互作用
Seasonal variation in the atmospheric deposition of inorganic constituents and canopy interactions in a Japanese cedar forest.
作者信息
Sase Hiroyuki, Takahashi Akiomi, Sato Masahiko, Kobayashi Hiroyasu, Nakata Makoto, Totsuka Tsumugu
机构信息
Ecological Impact Research Department, Acid Deposition and Oxidant Research Center, 1182 Sowa, Nishi-ku, Niigata 950-2144, Japan.
出版信息
Environ Pollut. 2008 Mar;152(1):1-10. doi: 10.1016/j.envpol.2007.06.023. Epub 2007 Jul 23.
The seasonal changes in throughfall (TF) and stemflow (SF) chemistry and the canopy interactions of K+ and N compounds were studied in a Japanese cedar forest near the Sea of Japan. The fluxes of most ions, including non-sea-salt SO4(2-), from TF, SF, and rainfall showed distinct seasonal trends, increasing from autumn to winter, owing to the seasonal west wind, while the fluxes of NH4+ and K+ ions from TF+SF might have a large effect of canopy interactions. The contact angle (CA) of water droplets on leaves decreased with leaf aging, suggesting that surface wettability increases with leaf age. The K+ concentration in TF was negatively correlated with the CA of 1-year-old leaves, while the NH4+ concentration was positively correlated with the CA. The net fluxes of NH4+ and NO3(-) from TF were positively correlated with the CA. The increase in wettability may accelerate leaching of K+ or uptake of NH4+.
在日本海附近的一片日本柳杉林中，研究了穿透雨（TF）和树干流（SF）化学性质的季节变化以及K⁺和N化合物的冠层相互作用。包括非海盐SO₄²⁻在内的大多数离子从TF、SF和降雨中的通量呈现出明显的季节趋势，由于季节性西风，从秋季到冬季增加，而来自TF + SF的NH₄⁺和K⁺离子通量可能受到冠层相互作用的很大影响。水滴在叶片上的接触角（CA）随叶片老化而减小，这表明表面润湿性随叶龄增加。TF中的K⁺浓度与1年生叶片的CA呈负相关，而NH₄⁺浓度与CA呈正相关。TF中NH₄⁺和NO₃⁻的净通量与CA呈正相关。润湿性的增加可能会加速K⁺的淋溶或NH₄⁺的吸收。
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