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当前位置: 首页 > 文章 > 罗浮栲和米槠细根形态功能性状对短期氮添加的可塑性响应 应用生态学报 2019 (12) 4003-4011
Position: Home > Articles > Plastic responses of fine root morphological traits of Castanopsis fabri and Castanopsis carlesii to short-term nitrogen addition Chinese Journal of Applied Ecology 2019 (12) 4003-4011

罗浮栲和米槠细根形态功能性状对短期氮添加的可塑性响应

作  者：
贾林巧;陈光水;张礼宏;陈廷廷;姜琦;陈宇辉;范爱连;王雪
单  位：
福建师范大学地理科学学院/湿润亚热带山地生态国家重点实验室培育基地;福建省顺昌县气象局
关键词：
氮沉降;细根形态;可塑性响应;养分觅食;根袋法
摘  要：
氮沉降会影响细根的形态功能性状,进而影响细根对养分的吸收,导致陆地生态系统养分循环发生变化.为了解氮沉降对细根形态功能性状的影响,利用根袋法进行原位试验,研究中亚热带常绿阔叶林外生菌根树种罗浮栲和米槠细根形态对短期氮添加的可塑性响应.结果表明:低序级根(1～3序级)的比根长和比表面积对氮添加的可塑性响应高于高序级根(4序级),细根组织密度对氮添加的可塑性响应从1序级到4序级逐渐加强,而各序级细根直径对氮添加则无显著的可塑性响应;低序级细根比根长、比表面积的可塑性响应与高序级细根组织密度的可塑性响应之间存在一定的协同变化.罗浮栲和米槠细根的比根长、比表面积、组织密度对氮添加表现出相反方向的可塑性响应,表明施氮后不同外生菌根树种采取了不同的养分觅食策略:施氮后罗浮栲在养分获取上采取的是增加比根长、比表面积和根长增殖速率的资源快速获取策略,而米槠则采取了增大细根组织密度的相对保守的资源获取策略.
译  名：
Plastic responses of fine root morphological traits of Castanopsis fabri and Castanopsis carlesii to short-term nitrogen addition
作  者：
JIA Lin-qiao;CHEN Guang-shui;ZHANG Li-hong;CHEN Ting-ting;JIANG Qi;CHEN Yu-hui;FAN Ai-lian;WANG Xue;School of Geographical Sciences,Fujian Normal University/Breed Base of State Key Laboratory of Humid Subtropical Mountain Ecology;Meteorological Bureau of Shunchang County in Fujian Province;
关键词：
nitrogen deposition;;fine root morphology;;plastic response;;nutrient foraging;;root bag method
摘  要：
Nitrogen deposition will affect the morphology of fine roots and its absorption of nutrien-ts, resulting in changes nutrient cycling in terrestrial ecosystems. In order to understand the effects of nitrogen deposition on fine root morphological traits of Castanopsis fabri and C. carlesii, two ectomycorrhizas tree species, we carried out in situ experiment using the root bags method in an evergreen broadleaved forest in the subtropical zone. The results showed that the plastic responses of specific root length and specific root surface area of low-order roots(first to third order) to nitrogen addition was higher than that of high-order roots(fourth order). The plastic responses of root tissue density to nitrogen addition increased from the first-order to the fourth-order, while the average root diameter of each order had no significant plastic responses to nitrogen addition. There was a certain synergistic change between the plastic response of specific root length and specific surface area in the low order fine root and the plastic response of tissue density in the high order fine root. The specific root length, specific root surface area and root tissue density of the two species showed opposite plastic responses to nitrogen addition, indicating that different ectomycorrhizal tree species had different nutrient foraging strategies. C. fabri adopted rapid absorption strategy by increasing specific root length, specific root surface area, and proliferation rate of fine root length, while C. carlesii adopted a relatively conservative resource absorption strategy by increasing tissue density of fine roots.

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