板栗细根的空间分布格局及季节动态  

Spatial distribution and seasonal dynamics of fine roots of Castanea mollissima

作　　者：谢明明 郭素娟[1] 宋影 张丽 孙慧娟 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083

出　　处：《浙江农林大学学报》2018年第1期60-67,共8页Journal of Zhejiang A&F University

基　　金："十二五"国家科技支撑计划项目(2013BAD14B0402);国家林业公益性行业科研专项重大项目(201204401)

摘　　要：为探明板栗Castanea mollissima细根的空间分布和季节变化,以河北省迁西县北京林业大学经济林(板栗)育种与栽培实践基地6年生板栗树为研究对象,生长季内(4-10月),采用连续根钻法(内径为8 cm),分别在距树干50 cm和100 cm设取样点,各个样点处垂直方向分3层(0~20,20~40和40~60 cm)钻取土芯。研究了板栗细根根长密度和根质量密度的月动态变化及空间分布特征。结果表明:在生长过程中板栗细根季节变化差异显著(P<0.05),板栗细根根长密度月平均为1 274.9 m·m^(-3),在6月和10月有2个生长高峰,相比前1个月分别增加了203.0 m·m^(-3)和524.6 m·m^(-3)。细根根质量密度月平均值为184.7 g·m^(-3),有2个生长阶段(4-6月和9-10月),10月增长较多,与9月相比增长了39.5 g·m^(-3)。在垂直方向上,20~40 cm土层中细根根长密度和根质量密度最大且季节变化最显著(P<0.05)。水平方向上,距树干100 cm处根长密度和根质量密度大于距树干50 cm处。整体研究表明:板栗细根的空间分布和季节变化不仅受土壤垂直格局影响,还与树种生长规律密切相关。To confirm the spatial distribution and seasonal dynamics of fine roots in the non-timber forest products breeding and cultivation practice base for Castanea mollissima（chestnut） of Beijing Forestry University in Qianxi, Hebei Province, the monthly dynamics and spatial distribution characteristics of fine root length density and dry weight density in a six-year-old chestnut plantation for the 0-20, 20-40, and 40-60 cm soil layers were studied using the soil coring method. Soil cores with a diameter of 8 cm were taken each month during the growing period（from April to October） about 50 and 100 cm away from the chestnut tree stem. Results showed that the fine root length density with a monthly average value of 1 274.9 m·m^-3 had two growth peaks. Compared to the previous month, June and October both had significant difference（P 0.05）, which increased203.0 m·m^-3 and 524.6 m·m^-3 separately. The fine root dry weight density had a monthly average value of184.7 g·m^-3 and two growing periods from April to June and from September to October. The fine root dry weight density in October was 39.5 g·m^-3 higher compared to that in September（P〈0.05）. The value of the fine root length density and dry weight density reached a maximum and changed with the seasons most noticeably in the vertical direction of the 20-40 cm soil layer（P〈0.05）. Also, the fine root length density and dry weight density in the horizontal direction about 100 cm were greater than those about 50 cm（P〈0.05）. This study indicated that spatial distribution and seasonal dynamics of fine roots likely resulted from spatial soil properties and the growth rule of C. mollissima.

关 键 词：经济林学 板栗 细根 根长密度 根质量密度 空间分布 季节动态 

分 类 号：S718.4[农业科学—林学] S664.2