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首页> 外文会议>Acid Rain 2000 >ACID DEPOSITION AND ACIDIFICATION OF SOIL AND WATER IN THE TIE SHAN PING AREA, CHONGQING, CHINA
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ACID DEPOSITION AND ACIDIFICATION OF SOIL AND WATER IN THE TIE SHAN PING AREA, CHONGQING, CHINA

机译：重庆铁山坪地区酸沉降及土壤和水的酸化

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Chongqing is among the heaviest polluted cities in China. Combustion of coal with relatively high sulfur content causes high sulfur emission and deposition in the area. Effects on soils and waters of the acid deposition in the Chongqing area have been studied in the field at a forested site outside the city. Deposition chemistry and fluxes, soil and soil water chemistry as well as surface water chemistry are presented for the period 1996-1998. There are some stress symptoms at the forest in the area and severe forest damage has been reported at Nanshan, closer to Chongqing center. Monitoring of the acidification situation in the area must be followed closely as impacts may be expected if the deposition is not reduced in the future.The deposition of sulfur, H~+ as well as calcium at the site is high. Wet deposition of sulfur is estimated to 4.7 - 5.7 g S m~(-2)yr~(-1) during the three years sampled; dry deposition is probably of similar size. Annual volume-weighted pH in bulk deposition was 4.0 - 4.2 and the calcium wet deposition flux was 2.6 - 3.6 g Ca~(2+) m~(-2). There are considerable seasonal variations in the concentrations, related to the seasonal variations in precipitation amount (dry winter, wet summer). The soils at the site are acid with median base saturation of 12% and 8% in the topsoil and subsoil, respectively. In soil water, aluminum concentrations are typically in the range 3-8 mg L~(-1). However, due to the high base cation deposition, the Al/(Ca~(2+)+Mg~(2+)) molar ratio is below unity in most samples, indicating little damage of forest due to aluminum in soil water.
机译：重庆是中国污染最严重的城市之一。含硫量相对较高的煤炭燃烧会导致该区域高硫排放和沉积。在重庆以外的森林地区，实地研究了重庆地区酸沉降对土壤和水体的影响。介绍了1996-1998年期间的沉积化学和通量，土壤和土壤水化学以及地表水化学。该地区的森林有一些压力症状，据报道，靠近重庆市中心的南山森林受到严重破坏。必须密切跟踪该地区的酸化情况，因为如果将来不减少沉积，可能会产生影响。该地点的硫，H〜+和钙的沉积量很高。在采样的三年中，硫的湿沉降估计为4.7-5.7 g S m〜（-2）yr〜（-1）;干沉积可能具有相似的大小。本体沉积的年体积加权pH为4.0-4.2，钙湿沉积通量为2.6-3.6 g Ca〜（2+）m〜（-2）。浓度的季节性变化很大，与降水量的季节性变化有关（冬季干燥，夏季潮湿）。场地土壤为酸性，表层土壤和下层土壤的中位饱和度分别为12％和8％。在土壤水中，铝的浓度通常在3-8 mg L〜（-1）范围内。然而，由于高碱性阳离子沉积，大多数样品中的Al /（Ca〜（2 +）+ Mg〜（2+））摩尔比均低于1，表明土壤水中铝对森林的破坏很小。

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