書誌事項
- タイトル別名
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- The Effect of Acid Precipitation on the Throughfall of the Forests Canopies in Chongqing, China.
- チュウゴクジュウケイ ニ オケル シンリン ノ リンナイウ ニ タイスル サンセイ チンチャク ノ エイキョウ
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The effects of forest canopy on the chemical composition of throughfall were studied on conifer (Cryptomeria Japonica) and deciduous (Sapium Japonicum) forests on Simian Mountain, which is 100 km from an urban area during 1992. 1-1995. 12. A similar study was done in the conifer forest (Pinus Massoniana) at Saqiaogou, which is close to an industrial center and is only 10 km from an urban area during 1994. 3-1995. 2. Moreover, the origins of the chemical compositon in the throughfall at Simian Mountain were estimated based on the budget model and their concentrations in bulk precipitation.<BR>All throughfall was acidified and ion concentrations were enriched due to the leaching and washoff of inorganic and organic matters that had accumulated on the foliage. The total ion concentration in the throughfall at Saqiaogou was higher than that of Simian Mountain, this appears to be caused by different levels of air pollution. It was found that there were higher concentrations of total ions in the throughfall of the conifer than in the deciduous canopy. The measurement results for the throughfall components and the step-sampled precipitation suggested that the contributions from foliage leaching of conifers were 26% for Ca2+ and 34% for Mg2+, those of deciduous trees were 34% for Ca2+ and 39% for Mg2+, while SO42- ion was not affected by canopy exchange.<BR>Calculations using a model indicated that the contribution from thefoliage leaching to the total throughfall flux for the conifer forest was 61, 59 and 11%, and 70, 64 and 28% for the deciduous forest for K+, Mg2+and Ca2+, respectively. F-, Cl-, NO3- and NH4+, however, were absorbed by the canopies. For these reasons, a large supply of N and Cl should affect the nutrient balance of the ecosystem. In particular, a large supply of F negatively affects vegetation and the foliage leaching of K+, Mg2+ and Ca2+ will cause a nutrient imbalance of the ecosystem and bring about the decline of the forests.
収録刊行物
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- 大気環境学会誌
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大気環境学会誌 34 (2), 53-64, 1999
公益社団法人 大気環境学会
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詳細情報 詳細情報について
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- CRID
- 1390282679594094464
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- NII論文ID
- 130004377240
- 110003841153
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- NII書誌ID
- AN10512108
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- ISSN
- 21854335
- 13414178
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- NDL書誌ID
- 4681520
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可