首页 | 本学科首页   官方微博 | 高级检索  
     

科尔沁沙地不同生境土壤氮矿化/硝化作用研究
引用本文:李玉强,赵哈林,李玉霖,崔建垣,左小安. 科尔沁沙地不同生境土壤氮矿化/硝化作用研究[J]. 中国沙漠, 2009, 29(3): 438-444
作者姓名:李玉强  赵哈林  李玉霖  崔建垣  左小安
作者单位:中国科学院寒区旱区环境与工程研究所, 甘肃 兰州 730000
基金项目:中国科学院西部之光西部博士项目,国家重点基础研究发展规划(973计划),国家自然科学基金 
摘    要:利用顶盖埋管原位培育法测定了科尔沁沙地不同生境(丘间低地、固定、半固定、半流动和流动沙丘)土壤氮素矿化/硝化速率的月际动态及净矿化/硝化量。结果表明:①沙地土壤无机氮主要以NO-3-N的形式存在,各类生境土壤NH+4-N平均含量比NO-3-N低58.2%~79.7%;②土壤氮素矿化/硝化速率随植被与土壤条件的恶化呈现递减的趋势,从丘间低地到流动沙丘,净矿化速率分别为61.0、43.4、29.1、5.3 mg·m-2·d-1和2.7 mg·m-2·d-1,净硝化速率分别为61.8、46.2、30.1、6.2 mg·m-2·d-1和3.4 mg·m-2·d-1;③从丘间低地到固定、半固定、半流动和流动沙丘,矿化氮总量分别减少28.8%、52.3%、91.4%和95.5%,硝化总量分别减少25.3%、51.3%、90.0%和94.5%;④不同类型生境土壤净硝化氮占净矿化氮的比例都为100%,表明沙地土壤中植物可利用氮素易于淋溶或氨挥发损失。

关 键 词:土壤氮素  矿化/硝化作用  科尔沁沙地  
收稿时间:2008-01-21;
修稿时间:2008-03-19

Soil Nitrogen Mineralization and Nitrification in Different Habitats,Horqin Sandy Land
LI Yu-qiang,ZHAO Ha-lin,LI Yu-lin,CUI Jian-yuan,ZUO Xiao-an. Soil Nitrogen Mineralization and Nitrification in Different Habitats,Horqin Sandy Land[J]. ournal of Desert Research, 2009, 29(3): 438-444
Authors:LI Yu-qiang  ZHAO Ha-lin  LI Yu-lin  CUI Jian-yuan  ZUO Xiao-an
Affiliation:Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
Abstract:Soil net N mineralization and nitrification were determined using the PVC tube closed-top in situ incubation method in different habitats (interdunal lowland, fixed, semi-fixed, semi-moving and moving sand dune) in Horqin sandy land. The results showed that: ①The NO-3-N accounted for larger proportion of mineral N in sandy land. The average NH+4-N concentration was lower from 58.2% to 79.7% than that of NO-3-N across all habitats. ②Soil net N mineralization and nitrification rates decreased along the degenerating of plant and soil. Net N mineralization rate was 61.0, 43.4, 29.1, 5.3 mg·m-2·d-1 and 2.7 mg·m-2·d-1 in interdunal lowland, fixed, semi-fixed, semi-moving and moving sand dune, respectively, whereas N nitrification rate was 61.8, 46.2, 30.1, 6.2 mg·m-2·d-1 and 3.4 mg·m-2·d-1. ③From interdunal lowland to fixed, semi-fixed, semi-moving and moving sand dune, the total net N mineralization was decreased by 28.8%,52.3%, 91.4% and 95.5%, and total net N nitrification by 25.3%, 51.3%, 90.0% and 94.5%, respectively. ④Nitrified N accounted for 100% of mineralized N in all the five habitats. This indicated that the sandy land was prone to losing inorganic N.
Keywords:soil nitrogen  net N mineralization/nitrification  Horqin sandy land
本文献已被 万方数据 等数据库收录!
点击此处可从《中国沙漠》浏览原始摘要信息
点击此处可从《中国沙漠》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号