| 石漠化山地植被恢复过程土壤团聚体氮分布及与氮素矿化关系研究 |
| 摘要点击 2269 全文点击 1020 投稿时间：2014-12-18 修订日期：2015-04-28 |
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| 中文关键词 植被恢复 岩溶石漠化 土壤团聚体 土壤有机氮 土壤氮矿化 |
| 英文关键词 vegetation restoration rocky desertification soil aggregates soil organic nitrogen soil nitrogen mineralization |
| 作者 | 单位 | E-mail | | 胡宁 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715
河南省新乡市地震局, 新乡 453000 | qningh@126.com | | 马志敏 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715
河南省新乡市第一中学, 新乡 453000 | | | 蓝家程 | 贵州师范大学中国南方喀斯特研究院, 贵阳 550001 | | | 伍宇春 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | | | 陈高起 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | | | 傅瓦利 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | fuwali@swu.edu.cn | | 文志林 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | | | 王文净 | 河南省新乡市地震局, 新乡 453000 | |
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| 中文摘要 |
| 为阐明岩溶石漠化区植被恢复对土壤氮素积累与供应的影响,分析了土壤各级团聚体不同形态氮库分配特征以及团聚体氮库与土壤氮素矿化之间的关系. 结果表明:①各样地土壤团聚体全氮、轻组氮、碱解氮、矿质氮含量基本上随团聚体粒径减小而升高,峰值出现在<0.25 mm粒径. 除矿质氮外,各种氮形态在不同样地之间,总体上表现为弃耕地< 草地< 灌丛地< 灌乔林地< 乔木林地、人工金银花地< 人工林地. ②各粒径团聚体有机氮库容量受团聚体粒径质量分数控制,其中5~10 mm、2~5 mm粒径团聚体有机氮库容量较大,土壤氮主要贮存于大团聚体中,大团聚体对土壤碳、氮的贮存有重要意义. ③团聚体全氮贮量中,0.25~1 mm、5~10 mm、2~5 mm粒径对土壤净氮矿化量贡献大,其它粒径贡献较小. 随植被恢复进程,土壤中>5 mm粒径团聚体质量分数逐渐提高,大团聚体氮贮量相应提高,在增强土壤供氮能力的同时,加强了对有机氮的贮存与保护. |
| 英文摘要 |
| In order to illuminate the impact on soil nitrogen accumulation and supply in karst rocky desertification area, the distribution characteristics of soil nitrogen pool for each class of soil aggregates and the relationship between aggregates nitrogen pool and soil nitrogen mineralization were analyzed in this study. The results showed that the content of total nitrogen, light fraction nitrogen, available nitrogen and mineral nitrogen in soil aggregates had an increasing tendency along with the descending of aggregate-size, and the highest content was occurred in <0.25 mm. The content of nitrogen fractions for all aggregate-classes followed in the order of abandoned land< grass land< brush land< brush-arbor land< arbor land in different sample plots. Artificial forest lands had more effects on the improvement of the soil nitrogen than honeysuckle land. In this study it also showed the nitrogen stockpiling quantity of each aggregate-size class was differed in all aggregate-size classes, in which the content of nitrogen fraction in 5-10 mm and 2-5 mm classes of soil aggregate-size were the highest. And it meant that soil nutrient mainly was stored in large size aggregates. Large size aggregates were significant to the storage of soil nutrient. For each class of soil aggregate-size, the contribution of the nitrogen stockpiling quantity of 0.25-1 mm class to soil net nitrogen mineralization quantity was the biggest, and following>5mm and 2-5 mm classes, and the others were the smallest. With the positive vegetation succession, the weight percentage of>5 mm aggregate-size classes was improved and the nitrogen storage of macro-aggregates also was increased. Accordingly, the capacity of soil supply mineral nitrogen and storage organic nitrogen were intensified. |
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