水曲柳前4级细根N内循环的研究  

Nitrogen Retranslocation from the First Four Order of Fine Root Branch of Fraxinus mandshurica

作　　者：黄石竹[1,2] 张彦东[2] 王政权[2] 孙晓新[2] 

机构地区：[1]黑龙江生态工程职业学院生态工程系,哈尔滨150025 [2]东北林业大学林学院,哈尔滨150040

出　　处：《森林工程》2014年第4期9-11,17,共4页Forest Engineering

基　　金：国家重点科技攻关项目(2011BAD37B02)

摘　　要：以黑龙江省东北林业大学帽儿山实验林场20年生水曲柳(Fraxinus mandshurica)人工纯林为研究对象,运用根序分级方法将水曲柳细根划分四个等级,将各等级活根与死根间的氮(N)含量(μg/cm)差异加以比较,研究水曲柳各级根序死亡脱落前是否发生N的内循环,并量化各级根序细根的N内循环率。结果显示:水曲柳一级根和二级根不存在N内循环,三级根和四级根有N内循环发生,内循环率分别为26.03%和50.93%。本研究结果表明:研究细根N内循环,应该考虑根序因素的影响。In this study, the nitrogen contents differences between live and dead roots were compared to study nitrogen retranslo- cation in the branch order fine roots of a Manchurian Ash （ Fraxinus mandshurica ） plantation located in the mountains of northeastern Heilongjiang Province. The results showed that： there was no nitrogen retranslocation from the first-order and the second-order roots, but there were nitrogen retranslocations from the third-order and the fourth-order roots, and nitrogen retranslocation efficiencys were 26. 03% and 50. 93% , respectively. These results illustrated that roots branch order may be an important indication of nitrogen retranslocation in dead fine roots.

关 键 词：细根 N内循环 根序 水曲柳 

分 类 号：S718.4[农业科学—林学]