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幼龄柠条细根现存量与环境因子的关系
引用本文:荀俊杰,李俊英,陈建文,史建伟,王孟本.幼龄柠条细根现存量与环境因子的关系[J].植物生态学报,2009,33(4):764-771.
作者姓名:荀俊杰  李俊英  陈建文  史建伟  王孟本
作者单位:(山西大学黄土高原研究所,太原 030006)
基金项目:山西省自然科学基金,山西省科技攻关项目 
摘    要: 以晋西北黄土高原区柠条(Caragana korshinskii)幼龄人工林为研究对象, 应用微根管技术(Minirhizotron technique)对林地100 cm土层范围的柠条细根生长动态进行了观测。以2007年生长季(5~9月)的根长密度(RLD, mm·cm–3)数据为基础, 对柠条细根现存量(RLDst, mm·cm–3)及其与环境因子(≥10 ℃积温、同期土壤积温、积降雨量和土壤水分等)的关系作了研究。结果表明, 40~90 cm土层是柠条细根的主要分布区和生长活跃区, 其细根占细根总量的59.7%。柠条细根现存量的季节变化特征为: 5月至9月上旬RLDst持续增加, 9月下旬RLDst略有降低。柠条细根现存量季节变化与≥10 ℃积温、同期土壤积温和积降雨量均存在极显著正相关关系。

关 键 词:细根  柠条  现存量  微根管  环境因子

RELATIONSHIPS OF FINE ROOT STANDING LENGTH OF CARAGANA KORSHINSKII SEEDLINGS WITH ENVIRONMENTAL FACTORS
XUN Jun-Jie,LI Jun-Ying,CHEN Jian-Wen,SHI Jian-Wei,WANG Meng-Ben.RELATIONSHIPS OF FINE ROOT STANDING LENGTH OF CARAGANA KORSHINSKII SEEDLINGS WITH ENVIRONMENTAL FACTORS[J].Acta Phytoecologica Sinica,2009,33(4):764-771.
Authors:XUN Jun-Jie  LI Jun-Ying  CHEN Jian-Wen  SHI Jian-Wei  WANG Meng-Ben
Affiliation:Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China
Abstract:Aims Fine root growth dynamics is a key aspect of the functions of forest ecosystems. Our objective was to analyze the seasonal growth pattern of fine root standing length of Caragana korshinskii, an important shrub species in the Loess Plateau, China. Methods We used the minirhizotron technique to investigate fine root growth dynamics of C. korshinskii in a 5-year old plantation in the Loess Plateau area, Northwest Shanxi and, based on data of root length density (RLD, mm·cm–3) from May to September 2007, analyzed relationships of fine root standing length (RLDst, mm·cm–3) with environment factors such as ≥10 ℃ accumulated air temperature, accumulated soil temperature, accumulated precipitation and soil water content. Important findings The 40–90 cm soil layer was the main area of growth and distribution of fine roots, accounting for 59.7% of the total. From May to early September, RLDst increased gradually, followed by a slight decrease in late September. The seasonal growth pattern of fine roots was closely related to ≥10 ℃ accumulated air temperature, accumulated soil temperature and accumulated precipitation.
Keywords:fine root  Caragana korshinskii  fine root standing length  minirhizotron  environmental factor
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