[杨树和草本植物细根中的氮循环及其动态特征]

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

作者信息

Fan Shihua, Li Peizhi, Wang Lihua, Xu Siming

机构信息

College of Science, Northwestern University, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.

出版信息

Ying Yong Sheng Tai Xue Bao. 2004 Mar;15(3):387-90.

PMID:15227985

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.hm-2, and its net accumulation was 10.0 kg.hm-2. With regard to the biological cycling of nitrogen, the annual uptake was 14.6 kg.hm-2 of which, the retention and the return was 9.6 and 5.1 kg.hm-2.yr-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.

摘要

在辽宁省沈阳市对杨树和草本植物细根中的氮循环及其动态特征进行了研究。结果表明，杨树和草本植物细根现存生物量中的氮含量为20.3 kg·hm⁻²，其净积累量为10.0 kg·hm⁻²。关于氮的生物循环，年吸收量为14.6 kg·hm⁻²，其中，存留量和归还量分别为9.6 kg·hm⁻²·yr⁻¹和5.1 kg·hm⁻²·yr⁻¹，周转期为4年。还研究了杨树和草本植物根中总氮与土壤有效氮之间的关系，结果表明，生长季草本植物根中总氮与土壤中NH₃-N存在相似的动态趋势。杨树细根中的总氮与生物量呈正相关。