Assessment of the potential for soil acidification in North India using the critical load approach and locally derived data for acidic and basic inputs.
Assessment of the potential for soil acidification in North India using the critical load approach and locally derived data for acidic and basic inputs.
复制标题
使用临界负荷方法和当地得出的酸性和碱性投入数据评估印度北部土壤酸化的潜力。
DOI：
10.1016/s0045-6535(03)00585-x
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发表时间：
2003
期刊：
影响因子：
8.8
通讯作者：
A. Taneja
中科院分区：
文献类型：
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作者：
G. S. Satsangi;A. Lawrence;A. Lakhani;A. Taneja
在印度AGRA用聚乙烯瓶和漏斗采集器对干湿沉降样品中的主要离子(Cl-−、NO3-−、SO42-−、钙、镁、钠、钾和氨)进行了分析。土壤等自然来源的离子组分(Ca~(2+)和Mg~(2+))的沉降量高于人为来源。在雨水样品中，非海盐含量为60%-90%。在湿法和干法沉积中，Ca~(2+)都是主要离子，这可能是由于Ca~(2+)颗粒较大所致。结果表明，由于NO_3-−、SO_4~(2-)−和Cl-−产生的酸度大部分被碱性组分中和，这些碱性组分来源于当地土壤和塔尔沙漠输送的沙尘。定量计算出土壤的酸中和容量为33×10~3neqg·−~(-1)。利用沉降量数据，估算了赤杨和桉树土壤的酸度临界负荷。发现目前S和N的沉积水平远低于为S和N计算的临界负荷，并计算了根据沉积酸度计算的超过临界负荷，发现为负。这表明，就这些物种而言，生态系统在目前的沉积水平上受到保护。
Major ions (Cl−, NO3−, SO42−, Ca2+, Mg2+, Na+, K+and NH4+) were analysed in wet and dry deposition samples collected for 2 years using a polyethylene bottle and funnel collector at Agra in India. The deposition of ionic components (Ca2+and Mg2+) derived from natural sources i.e. soil were higher than those of anthropogenic origin. In rainwater samples, non-sea-salt fraction was found to be 60–90%. In both wet and dry deposition Ca2+was found to be the dominant ion which may be due to its large particle diameter. Results suggest that most of the acidity, which occurs due to NO3−, SO42−and Cl−is neutralized by alkaline constituents, which originate from airborne local soil and dust transported from the Thar desert. Acid neutralizing capacity of soil has also been quantified and found to be 33×103neqg−1. Using deposition data, the critical load for acidity of soil with respect to Ashoka and Eucalyptus was evaluated. The present level of deposition of S and N was found to be much lower than critical loads calculated for S and N. Critical load of exceedance in terms of deposition acidity was also calculated and found to be negative. This indicates that with respect to these species, the ecosystem is protected at the current level of deposition.