栾树林对湘潭锰矿废弃地土壤碳氮含量的影响  

Effections of Koelreuteria paniculata Plantation on Soil Carbon, and Nitrogen Content in Xiangtan Manganese Mining Wasteland,Hunan

作　　者：罗赵慧[1] 田大伦[1] 宁晨[1] 闫文德[1] 

机构地区：[1]中南林业科技大学南方林业生态应用技术国家工程实验室,长沙410004

出　　处：《林业科学》2014年第3期130-133,共4页Scientia Silvae Sinicae

基　　金：国家林业公益性行业科研专项(201104009);湖南省教育厅项目(湘财教字;2010]70号);长沙市科技局创新平台项目(K1003009-61)

摘　　要：土壤有机碳和氮素是植物生长所必须的营养元素，也是土壤养分和生态系统中的关键生态因子，是陆地碳库和氮库的重要组成部分，其含量多少将会直接影响土壤中微生物数量和凋落物的分解速率（Nasholm et al．，1998；Dormaar et al．，1990；任书杰等，2006）。土壤有机碳和氮素的变化与土地利用／覆盖密切相关，地表植物群落的变化，往往会造成土壤碳和氮分布格局的变化，进而影响整个生态系统的稳定性和可持续性（刘全友等，2005）。Soil organic carbon （C） and nitrogen （N） are important components of soil nutrients. In order to explore the variation of soil nutrient contents, soil C and N contents and C ：N ratio were investigated in Koelreuteria paniculata forests grown in wasted manganese mine lands in Xiangtan, Hunan for different years in an vegetation restoration program. The result showed that soil C and N contents increased with the increase of the restoration time. The soil C content was 13.36, 14.78, and 26.96 g·kg-1 in 3-, 5- and 9-year-old stands, respectively, and they were 1.30, 1.44 , and 2.63 times of the control plot （10.27 g·kg-1） , respectively. The N were 0.54, 0.59, and 1. 12 g·kg-1in 3-, 5- and 9-year-old stands, respectively, which means that they were about 38% , 51% and 187% higher than the control plot （0.39 g·kg-1 ） , respectively. The soil C and N were significantly higher in 9-year-old stands than the control plot （ P 〈 0.05 ）. The soil C and N varied with soil depths in the forests at different restoration stage. The C ： N ratio in soil ranged from 26. 60 to 23.75 at different restoration stages of forests, and decreased with the increase of the duration. The soil C ： N ratio declined by 2.79 in 9-year-old stands compared to control stands. In the study site, soil pH was slightly positively correlated to soil C and N contents, as well a＇s soil C：N ratio （P 〉 0.05）. There was a significantly positive correlate/on between soil C content and soil N content （P 〈 0.01 ）. Significantly positive correlations were found between soil C content and C：N ratio （P 〈 0.01 ） while positive correlations were found between soil N content and C：N ratio （P 〈 0. 05 ）. Our results provided scientific＇reference for examining the dynamics of soil nutrients during restoration and evaluating the effects of vegetation restoration in mining wastelands.

关 键 词：栾树 植被恢复 废弃地 土壤 碳 氮 C N 

分 类 号：S72[农业科学—林木遗传育种]