| 科尔沁沙地不同生境土壤氮矿化/硝化作用研究 |
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| 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. |
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| 作者姓名： | 李玉强 赵哈林 李玉霖 崔建垣 左小安 |
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| 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 |
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| 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 |
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| 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。
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| 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 |
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| 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].Journal of Desert Research,2009,29(3):438-444. |
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| Authors: | LI Yu-qiang ZHAO Ha-lin LI Yu-lin CUI Jian-yuan ZUO Xiao-an |
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| Institution: | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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| 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. |
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| Keywords: | soil nitrogen net N mineralization/nitrification Horqin sandy land |
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