重庆农业生态系统中酸雨因子的特点及其影响

Characteristic of Acid Rain Factors and Acid Rain Influence on the Agroecosystem in Chongqing

采用野外采样和室内分析,试验结果表明,酸雨对重庆区域农业生态系统影响不明显,菜地土壤有一定酸化趋势。农田大气中酸雨的主要因子SO2、NOX具有显著正相关,协同作用明显,但分布无明显规律性。农田灌溉水呈中性至微碱性,江水碱性明显。中性的灌溉水对土壤酸化有正面作用,碱性的灌溉水能阻止土壤酸化。不同种植类型土壤酸碱度差异明显,茶叶土壤为酸性,水果土壤则以碱性为主,因此可根据不同作物对土壤酸碱的喜好,调整种植品种和区域。

By collecting samples outdoor and analysis indoor, these results display that this phenomena that acid rain influence on the agricultural ecosystem is not very obvious in chongqing, but there is a serious trend on vegetable soil. Main factors of acid rain （ SO2 , NOx ） have obvious positive relativity, and cooperating action is very obvious, hut the distribution has not obvious rule. Farmland＇ s irrigation water appear neuter to tiny alkalescence, and the river appear obvious alkalinity. Neuter irrigation water accelerate the soil＇ s acidification, and alkaline irrigation water can prevent the soil＇ s acidification. Difference of acidity and alkalinity of soil is very obvious among different planting types, and tea-soil is acid and fruit-soil is alkalescence. So during the agricultural produce, according to different crop＇s fancy, it is important to adjust planting breed and area.