权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Acidification Control of Forest Ecosystem Based on Critical Loads of Sulfur, Nitrogen and Hydrogen

基于硫氮氢临界负荷的森林生态系统酸化控制

基本信息

批准号：
09480120
负责人：
OKAZAKI Masanori
金额：
$ 4.35万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09480120/
关键词：
sulfur nitrogen hydrogen forest ecosystem monitoring acidification buffering capacity simulation 緩衝シュミュレーション

项目摘要

From the input and output study of elements based on the monitoring in the small watershed under Hinoiki cypress, Japanese ceder, oak and red pine forest of Hachioji and Kiasaradzu, the acidification of the watershed occurred in recent years. Specially in red pine forest of Hachioji, calcium and magnesium as cations and sulfate as a anion were leached out from the watershed.To determine critical load of acid deposition in the forest of the western part of Tokyo Metropolitan the steady state mass balance model was applied. Furthermore, exceedance of acid deposition was calculated from the difference between present acid deposition load and critical load. Sulfur was exceeded, because the critical load of sulfur is smaller than that of nitrogen in the study areas. Applying the reduction scenario to be up to 1/2 of acid deposition determined in 1997 (scenario 1) to the forested area of Tokyo Metropolitan, sulfur excess would still be present. In case of scenario 2, which reduces up to 1/4 of acid deposition determined in 1997, the sulfur excess will be over in most of the study areas. It is concluded that the reduction of sulfur should be up to 1/4 of acid deposition in 1997 to maintain the forest ecosystems in the western part of Tokyo Metropolitan.

通过对八王子和木笠津的桧林、柏木林、栎林和红松林下小流域的元素监测，分析了该流域的元素输入和输出情况，发现该流域近年来出现了酸化现象。特别是在八王子的红松林，钙和镁作为阳离子和硫酸根作为阴离子淋溶出的分水岭。确定酸沉降的临界负荷在东京都西部的森林中的稳态质量平衡模型。根据目前酸沉降负荷与临界负荷之差，计算了酸沉降的临界负荷。研究区土壤中硫的临界负荷小于氮的临界负荷，导致土壤中硫含量超标。将1997年确定的酸沉降量减少到1/2的情景（情景1）应用于东京都的森林地区，硫过量仍然存在。在情景2的情况下，减少了1/4的酸沉降在1997年确定，硫过量将在大多数研究领域。结果表明，为了维持东京都西部地区的森林生态系统，到1997年，硫的削减量应达到酸沉降量的1/4。