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应用生态学报 ›› 2004, Vol. ›› Issue (3): 387-390.

• 研究论文 • 上一篇    下一篇

杨树人工林下根系的氮素循环与动态特征

范世华1,2, 李培芝2, 王力华2, 许思明2   

  1. 1. 东北大学理学院, 沈阳 110004;
    2. 中国科学院沈阳应用生态研究所, 沈阳 110016
  • 收稿日期:2002-08-13 修回日期:2003-06-08 出版日期:2004-03-15
  • 通讯作者: 范世华,男,1948年出生,硕士,教授,主要从事环境化学与微量元素研究、流动分析及联用技术研究和环境科学中的仪器分析方法研究,发表论文70余篇,E-mail:shfan@mail.neu.edu.cn
  • 基金资助:
    中国科学院沈阳生态实验站资助项目

Nitrogen cycling and its dynamic feature in fine roots of poplar trees and herbs

FAN Shihua1,2, LI Peizhi2, WANG Lihua2, XU Siming 2   

  1. 1. Collage of Science, Northwestern University, Shenyang 110004, China;
    2. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2002-08-13 Revised:2003-06-08 Online:2004-03-15

摘要: 研究了辽宁沈阳地区人工林杨树细根及林下草本植物根系的N循环、积累和动态变化特征.结果表明,杨树人工林分条件下活细根中N储量为20.3kg·hm-2,净积累量10kg·hm-2,吸收量14.7kg·hm-2,年存留量和归还量分别为9.6和5.1kg·hm-2.周转期4年.整个生长季节杨树细根中N含量与土壤中水解N、NH3-N无明显相关.杨树细根中N浓度与活细根生物量的变化趋势大体一致,两者呈显著正相关.根据杨树活细根中N含量可以估测杨树活细根生物量.该林分下的草本植物根系主要吸收NH3-N,草根中N含量浓度变化与土壤中NH3-N的变化趋势相同,两者呈显著正相关.

Abstract: The nitrogen cycling and its dynamic feature in fine roots of poplar trees and herbs were studied in Shenyang of Liaoning Province. The results showed that the nitrogen content in the standing biomass of fine roots of poplar trees and herbs was 20.3 kg穐m-2,and its net accumulation was 10.0 kg穐m-2. With regard to the biological cycling of nitrogen,the annual uptake was 14.6 kg穐m-2 of which,the retention and the return was 9. 6 and 5.1 kg穐m-2穣r-1 respectively,and the turnover period was 4 year. The relationship between total nitrogen in roots of poplar trees, and herbs and the available nitrogen in soil was also studied, which indicated that there were similar dynamic trends between total nitrogen in herb roots and the NH3-N in soil in growth season. The total nitrogen in fine roots of poplar trees was positively related to the biomass.

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