Sulfate and Nitrate Loads on a Forest Ecosystem in Kochi in Southwest of Japan
Sulfate and Nitrate Loads on a Forest Ecosystem in Kochi in Southwest of Japan
复制标题
日本西南部高知县森林生态系统的硫酸盐和硝酸盐负荷
DOI：
10.1007/978-94-007-0810-5_33
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
K. Hirai
中科院分区：
文献类型：
--
作者：
Tsuyoshi Yamada;S. Yoshinaga;K. Morisada;K. Hirai
为了评价酸沉降对森林生态系统的影响，有必要对酸沉降总量进行估算。在本文中，我们讨论了1991年至1999年的变化硫酸盐（SO 42）和硝酸盐（NO3）的负荷以及相关的浓度在日本西南部的高知县的扁柏（Chamaparis obtusa）种植园。在研究期间，年降水量在1，700至3，900毫米之间变化很大。降雨中硫酸盐的年浓度约为15 μmol L-1，其中约80%为非海盐硫酸盐，而降雨中硝酸盐的年浓度呈上升趋势。穿透雨的硫酸盐和硝酸盐浓度以及茎流的硝酸盐浓度与降雨相当或略高于降雨。然而，茎流硫酸盐浓度高于降雨，21至55 μmol L-1。降雨的硫酸盐和硝酸盐负荷分别为27至46和14至43 mmol m-2 y-1。穿透雨的硫酸盐和硝酸盐负荷与降雨相同或略高。相反，茎流的硫酸盐和硝酸盐负荷小于降雨。穿透雨和树干径流的硫酸盐负荷约为降雨硫酸盐负荷的1.5倍。
To assess the influence of acidic deposition on the forest ecosystem, it is necessary to evaluate the gross amount of acidic deposition. In this paper, we discuss the variation of sulfate (SO42) and nitrate (NO3) loads as well as related concentration from 1991 to 1999 in the Hinoki (Chamaecyparis obtusa) plantation in Kochi, southwest Japan. The annual precipitation varied significantly from 1,700 to 3,900 mm during the study period. The annual sulfate concentration of rainfall was about 15 μmol L-1, including about 80% non sea salt sulfate, while the annual nitrate concentration of rainfall was increased. The sulfate and nitrate concentrations of the through fall and the nitrate concentration of the stem flow were equal to or slightly higher than those of rainfall. However, the sulfate concentration of the stem flow was higher than that of rainfall, 21 to 55 μmol L-1. The sulfate and nitrate loads of rainfall were measured to be 27 to 46 and 14 to 43 mmol m-2y-1, respectively. The sulfate and nitrate loads of the through fall were the same or slightly higher than those of rainfall. In contrast, the sulfate and nitrate loads of the stem flow were less than those of rainfall. Combined sulfate loads of the through fall and the stem flow reached about 1.5 times that of the sulfate load of rainfall.