Throughfall chemistry and canopy interactions in a Sitka spruce plantation sprayed with six different simulated polluted mist treatments.
Throughfall chemistry and canopy interactions in a Sitka spruce plantation sprayed with six different simulated polluted mist treatments.
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DOI：
10.1016/s0269-7491(03)00259-8
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发表时间：
2004
影响因子：
8.9
通讯作者：
M. Chiwa;A. Crossley;L. Sheppard;H. Sakugawa;J. Cape
中科院分区：
文献类型：
--
作者：
M. Chiwa;A. Crossley;L. Sheppard;H. Sakugawa;J. Cape
在成熟的锡特卡云杉种植园中研究了降雨化学，以调查冠层相互作用，如氮吸收，阳离子淋溶，中和降雨通过冠层。自1996年以来，种植园暴露于6种不同的模拟雾处理，包括N（NH 4 NO3）和S（H2SO 4，pH 2.5）在4个复制块。收集了2000年5月至9月的降雨量和降水量。结果表明，氮素在冠层中的滞留率为30-35%。H+的损失与K+、Mg ~（2+）和Ca ~（2+）通过冠层沉积的增加呈线性关系。然而，这些增加的K+，Mg 2+和Ca 2+的沉积只占约50%的总中和的酸度。穿透雨阴离子亏缺量与H+损失量的关系表明，弱有机酸阴离子参与了穿透雨酸度的中和作用。
Throughfall chemistry was studied in a mature Sitka spruce plantation in order to investigate canopy interactions, such as nitrogen absorption, cation leaching, and neutralization of rainfall passing through the canopy. The plantation had been exposed to six different simulated mist treatments including N (NH4NO3) and S (H2SO4at pH 2.5) in four replicated blocks since 1996. Throughfall and rainfall were collected from May to September 2000. The results showed that 30–35% of the applied N was retained by the canopy. There were linear relationships between the loss of H+and increased K+, Mg2+and Ca2+deposition through the canopy. However these increases in K+, Mg2+and Ca2+deposition accounted for only about 50% of total neutralization of the acidity. The relationship between the anion deficits in throughfall and the loss of H+implied that weak organic acid anions were involved in the neutralization of the acidity in throughfall.