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中国农学通报 ›› 2016, Vol. 32 ›› Issue (19): 7-13.doi: 10.11924/j.issn.1000-6850.casb15110145

• 林学 园艺 园林 • 上一篇    下一篇

氮磷添加对苦槠次生林凋落物量及其养分动态的影响

李茂,徐俊,田地,余鑫,徐小牛   

  1. 安徽农业大学林学与园林学院,安徽农业大学林学与园林学院,北京大学城市与环境学院,安徽农业大学林学与园林学院,安徽农业大学林学与园林学院
  • 收稿日期:2015-11-27 修回日期:2015-12-23 接受日期:2015-12-24 出版日期:2016-07-15 发布日期:2016-07-15
  • 通讯作者: 李茂
  • 基金资助:
    :国家自然科学基金项目“不同林龄序列亚热带常绿阔叶林地下碳氮耦合循环特点”(31370626)、“松材线虫病危害后马尾松林土壤碳氮动态及流域水平氮淋失特点”(31070588);国家“973”计划项目“人工林地下生态系统碳固持与木材生产权衡关系”(2012CB416905)。

Effect of Nitrogen and Phosphorus Addition on Litterfall Production and Nutrient Dynamics in a Castanopsis sclerophylla Secondary Forest

  • Received:2015-11-27 Revised:2015-12-23 Accepted:2015-12-24 Online:2016-07-15 Published:2016-07-15

摘要: 中国是全球高氮沉降区之一,氮沉降对生态系统的结构和功能产生严重影响。为了探讨氮沉降增加对森林生态系统的影响,选择苦槠次生林开展氮磷添加试验,以揭示其凋落物生产及其养分归还对氮磷添加的响应。笔者采用野外模拟试验,设计4 种处理,分别为对照(CK)、磷(P)、高氮(HN)和高氮加磷(HN+P),每个处理重复3 次。结果表明:通过1 年的试验观测,经P、HN、HN+P处理后,年凋落物量分别为8.69、8.11、9.41 t/hm2,明显高于对照林分(7.68 t/hm2);P、HN、HN+P处理均增加养分归还总量,大小顺序为:HN+P>P>HN>CK,氮磷添加同样增加了N、P、K、Ca、Mg的年归还量,大小顺序为:N>Ca>K>Mg>P。研究表明,氮磷添加均提高林分凋落物量和养分归还量,高氮加磷有助于维持土壤氮磷动态平衡,显著提高凋落物产量。

关键词: 性能测试, 性能测试, Web应用, 考试系统, LoadRunner, 性能优化

Abstract: China is one of the regions with high N deposition in the world. Nitrogen deposition has a serious impact on the structure and function of forest ecosystem. The paper aims to reveal the effects of increasing N deposition on litter production and related nutrient returns in forest ecosystem, an experiment of N and P addition was conducted in a secondary Castanopsis sclerophylla forest. In the field simulated experiment, 4 treatments were designed as CK, P addition (P), high N addition (HN), and high N P addition (HN P), with 3 replicates for each treatment. The results from the one- year observation showed that: annual litterfall productions were 8.69, 8.11, and 9.41 t/hm2 for P, HN and HN P treatment, significantly higher than that of the CK (7.68 t/hm2). The amount of nutrient returns by litterfall was all increased to some degree due to N and P addition. The order of the total nutrient returns was: HN P>P>HN>CK. The N and P addition also increased the amount of nutrient returns annually. The N and P addition increased the nutrient elements return in an order of N>Ca>K>Mg>P. These results indicated that N and P addition improved the litterfall quantity and related nutrient return. High N plus P could maintain the balance of soil nitrogen and phosphorus, significantly increase litter productivity.