不同类型的酸雨对土壤池产生对比的影响
Xingyu Pan1, Yi Jian2, Zhenfeng Xu1
1Forest Ecology and Conservation in the Upper Reaches of the Yangtze River, Key Laboratory of Sichuan Province & Sichuan Mt. Emei Forest Ecosystem National Observation and Research Station, College of Forestry, Sichuan Agricultural University, Chengdu, 611130, China.
不同类型的酸雨显著影响土壤 (N) 池. 硫酸雨 (SAR) 增加了总N和氨N,而酸雨 (NAR) 减少了它们,pH值是主要的驱动因素.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 生态生态学 生态生态学
背景情况:
- 酸雨是影响土壤 (N) 池的主要全球变化驱动因素.
- 大气沉积已经从硫酸雨 (SAR) 转变为混合酸雨 (MAR) 和酸雨 (NAR).
- 不同类型的酸雨对土壤N池的影响尚不清楚,尤其是大规模的影响.
研究的目的:
- 系统地评估不同类型的酸雨 (SAR,MAR,NAR) 对土壤N池的影响.
- 通过大规模的元分析,分析各种生态系统的这些影响.
- 确定影响土壤N池对酸雨反应的主要驱动因素.
主要方法:
- 对74项研究中的1195个配对观察结果进行了元分析.
- 系统地评估了SAR,MAR和NAR对各种土壤N池 (总N,氨N,N,微生物生物质N,性水解N) 的影响.
- 分析了依赖生态系统的反应以及pH值,气候和土壤质感的影响.
主要成果:
- 沙尔增加了土壤总N和氨N,同时减少了酸盐N和微生物生物质N.
- NAR降低了土壤总N,氨N和微生物生物质N,但增加了性水解性N.
- 马尔显示中间效应;响应在森林和草原中更强,主要由pH驱动.
结论:
- 酸雨的组成从根本上改变了土壤的N动态,pH是主要的控制因素.
- 酸雨 (NAR) 给受影响的生态系统带来了特别的脆弱性.
- 结果要求将差异性酸雨效应纳入地球系统模型,以准确地预测N循环.
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