幼龄柠条细根现存量与环境因子的关系  

RELATIONSHIPS OF FINE ROOT STANDING LENGTH OF CARAGANA KORSHINSKII SEEDLINGS WITH ENVIRONMENTAL FACTORS

作　　者：荀俊杰[1] 李俊英[1] 陈建文[1] 史建伟[1] 王孟本[1] 

机构地区：[1]山西大学黄土高原研究所,太原030006

出　　处：《植物生态学报》2009年第4期764-771,共8页Chinese Journal of Plant Ecology

基　　金：山西省自然科学基金(2007021032);山西省科技攻关项目(2006031014)

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100cm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,40～90cm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。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 korshin- skii, 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.crn-3） with environment factors such as ≥10℃accumulated air tem- perature, 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.

关 键 词：细根 柠条 现存量 微根管 环境因子 

分 类 号：S793.3[农业科学—林木遗传育种]