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模拟氮沉降对土壤酸化及土壤酸缓冲能力的影响

胡 波 王云琦 王玉杰 王 彬 张会兰 郭 平 刘春霞

胡 波, 王云琦, 王玉杰, 王 彬, 张会兰, 郭 平, 刘春霞. 模拟氮沉降对土壤酸化及土壤酸缓冲能力的影响[J]. 环境科学研究, 2015, 28(3): 418-424.
引用本文: 胡 波, 王云琦, 王玉杰, 王 彬, 张会兰, 郭 平, 刘春霞. 模拟氮沉降对土壤酸化及土壤酸缓冲能力的影响[J]. 环境科学研究, 2015, 28(3): 418-424.
HU Bo, WANG Yunqi, WANG Yujie, WANG Bin, ZHANG Huilan, GUO Ping, LIU Chunxia. Effects of Simulated Nitrogen Deposition on Soil Acidification and Soil Buffering Capacity[J]. Research of Environmental Sciences, 2015, 28(3): 418-424.
Citation: HU Bo, WANG Yunqi, WANG Yujie, WANG Bin, ZHANG Huilan, GUO Ping, LIU Chunxia. Effects of Simulated Nitrogen Deposition on Soil Acidification and Soil Buffering Capacity[J]. Research of Environmental Sciences, 2015, 28(3): 418-424.

模拟氮沉降对土壤酸化及土壤酸缓冲能力的影响

基金项目: 国家自然科学基金项目(31100515);高等学校博士学科点专项科研基金项目(20110014120001)

Effects of Simulated Nitrogen Deposition on Soil Acidification and Soil Buffering Capacity

  • 摘要: 为探讨N沉降对酸雨区森林土壤酸化和土壤酸缓冲能力的影响,于2012年4—12月在重庆缙云山地区选取针阔混交林和常绿阔叶林2种典型林分进行模拟N沉降试验,设N0、N1、N2、N3 4个处理,施N量(模拟N沉降量)分别为0、60、120、240 kg/(hm2·a),每月月初将NH4NO3溶液均匀喷洒在所选样方内,8个月后进行取样分析. 结果表明:①不同pH下2种林分土壤的酸缓冲能力存在较大差异,pH越低土壤酸缓冲能力越高. ②2种林分的土壤酸缓冲能力随N沉降量的增加而降低. 在相同的N沉降量下,常绿阔叶林土壤酸缓冲能力略高于针阔混交林. ③N沉降会加快土壤酸化速率. 与N0处理相比,N1、N2、N3处理常绿阔叶林土壤pH分别下降了0.03、0.06、0.16,而针阔混交林则分别下降了0.08、0.10、0.26. ④2种林分土壤中盐基离子含量均随N沉降量的增加而降低,交换性Al3+含量则相反. 与N0处理相比,常绿阔叶林N1、N2、N3处理盐基离子含量分别下降了55.76%、66.00%、70.38%,交换性Al3+含量分别增加了16.03%、21.37%、31.81%;针阔混交林盐基离子含量分别下降了24.12%、43.38%、62.24%,交换性Al3+含量分别增加了19.19%、23.48%、34.85%. 研究表明,氮沉降会降低森林土壤酸缓冲能力,加快酸化速率,并且常绿阔叶林土壤对N沉降的敏感性高于针阔混交林.

     

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