Throughfall chemistry and canopy interactions in a Sitka spruce plantation sprayed with six different simulated polluted mist treatments

M. Chiwa, A. Crossley, L. J. Sheppard, H. Sakugawa, J. N. Cape

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

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 (H2SO4 at 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.

Original languageEnglish
Pages (from-to)57-64
Number of pages8
JournalEnvironmental Pollution
Volume127
Issue number1
DOIs
Publication statusPublished - Jan 1 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

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