摘要
纳帕海湿地区4类主要土壤的退化程度由高而低为弃耕地-中生草甸土（AFMMS）、中生草甸土（MMS）、湿草甸土（WMS）和沼泽土（MS）,对4类土壤0~10 cm、10~20 cm、20~30 cm采样,分析全氮（TN）、速效氮（RAN）、溶解有机氮（DON）、无机氮（IN）含量。结果表明：在剖面垂向,沼泽土TN和RAN含量中上层相对富集,而DON和IN含量由上而下逐渐降低、上层相对富集;其它三类土壤氮素含量总体由上而下降低、上层相对富集;4类土壤间。
There are 4 soil types of in Napahai wetland reserve,northwest Yunnan-Abandoned Farmland Mesophytic Meadow Soil（AFMMS）,Mesophytic Meadow Soil（MMS）,Wet Meadow Soil（WMS）,and Marsh Soil（MS）,correspondingly their degradation degrees from high to low.Contents of Total N（TN）,Rapid Available N（RAN）,Dissolved Organic N（DON） and Inorganic N（IN） at 3 layers（1st 0 ~ 10 cm,2nd 10 ~ 20 cm,3rd 20 ~ 30 cm） were analyzed for these 4 types of soils.Results showed that： ① From up to down in the soil profiles,contents of N components of AFMMS,MMS and WMS decreased gradually,but relatively concentrated in the 1st layer.The orders of the TN and RAN contents of MS were the 2nd layer the 1st layer the 3rd layer,which indicated relative enrichment in the 1st and 2nd layers;but the contents of DON and IN of MS decreased downwards and relatively enriched in the 1st layer.Both DON and IN accounted for very low percentages of RAN of the 4 types of soils.② Among 4 soils,the contents of N components in the 1st layer showed significant variation as AFMMS MMS WMS MS,but no obvious variation in the 2nd and 3rd layers（except the layers of MS）.The significant variation of N components in the 1st layers among 4 soils revealed the effects of human disturbances within the wetland region.③ The corresponding relationship between the variation of N components in the 1st layers and the soil moisture condition among 4 soils showed,wetland becoming dry would accelerate the loss of soil N components in the wetland.Regulating measures should be taken to control further wetland drying in future Napahai conservation and management.
出处
《土壤通报》
CAS
CSCD
北大核心
2012年第3期690-695,共6页
Chinese Journal of Soil Science
基金
国家自然科学基金项目(40961003)
云南省社发科技项目(2008CA00602)
国家科技基础性工作专项(2008FY110300)资助
关键词
纳帕海湿地
湿地退化
土壤
氮素分异
Napahai wetland
Wetland degradation
Soil
N component variation
