氮素输入与降水增加对温带草原土壤金属元素库存的影响  

Effects of nitrogen addition and increased precipitation on metal pools in temperate steppe,northern China

作　　者：刘泽睿 王俊坚[2] 万师强[3] 曾辉[1] 

机构地区：[1]北京大学深圳研究生院城市规划与设计学院,广东深圳518055 [2]多伦多大学物理和环境学院 [3]河南大学生命科学学院全球变化生态学实验室,河南开封475004

出　　处：《生态学杂志》2016年第5期1125-1131,共7页Chinese Journal of Ecology

基　　金：国家重点基础研究发展计划项目(2013CB956303)资助

摘　　要：本文以内蒙多伦温带草原为对象,研究氮素输入、降水增加对土壤中Mn、Cr、V、Pb、Ni、Cu、Co和Cd等8种金属元素总量浓度及其3种形态浓度(可交换态、碳酸盐结合态、有机结合态)的影响。结果表明:9年的氮素输入和降水增加对土壤金属总量浓度无统计学上的显著性影响,但引起Mn、Pb、Ni、Co、Cd的可交换态浓度和Cr的有机结合态浓度的显著下降(P<0.10)。总体来说,大气氮沉降增加和降水增加对于温带草原土壤金属元素的库存与形态影响有限,在9年时间尺度上并不会造成相关土壤环境质量的巨大变动,但需要注意金属元素可交换态浓度的变化。This study investigated the total concentration and three chemical fractions （exchange- able, carbonate, and organic fractions） of soil metals （Mn, Cr, V, Pb, Ni, Cu, Co and Cd） with simulated nitrogen addition and increased precipitation in a temperate steppe site in Duolun, Inner Mongolia. After nine years of nitrogen addition, increased precipitation and their interaction treatments, no statistically significant effect was observed on the total concentrations of soil met- als. Only the concentrations of the exchangeable fraction of Mn, Pb, Ni, Co, and Cd, and the organic fraction of Cr were significantly decreased （P〈0.10）. In conclusion, long-term nitrogen addition and increased precipitation have limited effect on soil metal concentrations and their chemical fractions. The metal-related soil environmental quality in the studied semiarid temperate steppe is relatively stable in response to increasing atmospheric nitrogen deposition and precipita- tion within nine years; however, more attention should be paid to the possible change in the ex- changeable fraction of soil metals.

关 键 词：氮添加 水分添加 降雨 控制实验 温带草原 

分 类 号：S812.2[农业科学—草业科学]