文献类型：期刊文献

中文题名：三峡库区马尾松细根分解及其养分释放

英文题名：Fine Root Decomposition and Nutrient Release of Pinus Massoniana in the Three Gorges Reservoir Area

作者：王娜[1,2] 程瑞梅[1,2] 肖文发[1,2] 沈雅飞[1,2]

第一作者：王娜

机构：[1]中国林业科学研究院森林生态环境与保护研究所国家林业局森林生态环境重点实验室;[2]南京林业大学南方现代林业协同创新中心

年份：2017

卷号：30

期号：1

起止页码：18-24

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2017_2018】；

基金：十三五国家重点研发计划(2016YFD0600204);科技基础性工作专项(2014FY120700);十二五科技支撑计划(2015BAD07B04)

语种：中文

中文关键词：三峡库区;马尾松;细根分解;养分释放

外文关键词：Three Gorges Reservoir Area; Pinus massoniana; fine root decomposition; nutrient release

分类号：S791.248

摘要：[目的]为认识马尾松细根对土壤养分库的贡献,[方法]本研究以三峡库区秭归县九岭头林场马尾松为研究对象,采用埋袋法进行细根分解实验,探讨<0.5 mm、0.5 1 mm和1 2 mm细根的分解动态和养分释放(C、N、P、K、Ca、Mg)。[结果]结果表明:(1)细根分解368 d后,<0.5 mm、0.5 1 mm和1 2 mm细根干重残留率分别为66.0%、72.0%和74.33%,且细根分解速率随直径增加而减小;(2)细根分解速率与土壤温度呈显著正相关关系(p<0.05),与土壤湿度呈正相关关系(p<0.05);(3)细根C、K和Mg元素迁移模式表现为释放,Ca元素表现为富集;(4)细根N、P元素在不同径级细根中迁移模式不同,<0.5 mm细根N、P元素表现为释放,0.5 2 mm细根N、P元素在分解过程中出现富集阶段。[结论]马尾松细根分解与土壤温度和直径大小显著相关,其中分解与温度呈正相关,与直径呈负相关;在细根分解过程中,马尾松细根不同直径大小的不同养分元素的表现状态不一致,或富集,或释放。
[Objective ] The purpose of this study is to determine the contribution of fine root of Pinus massoniana L. on soil nutrient pool. [ Method] Decomposition experiment, using the buried bag method, was conducted to examine 〈 0.5 mm, 0, 5 - 1 mm and 1 - 2 mm fine root decomposition dynamics and nutrient release （ C, N, P, K, Ca, Mg） in Pinus massoniana at Jiulingtou Forest Farm of Zigui county, Three Gorges Reservoir Area, China. [ Result ] The results showed that ： （ 1 ） the decomposition rate decreased with root diameter increasing of Pinus massoniana, and after 368 days, the remaining percentage of 〈 0.5 mm, 0.5 - 1 mm and 1 - 2 mm fine root were 66.0% , 72.0% and 74.33% respectively. （2） The soil temperature had significant positive effect on decomposition rate, and soil moisture had positive effect on decomposition rate. （3） The transfer model for C, K and Mg of fine root was releasing, while enriching for Ca. （4） The transfer models for N and P of 〈 0.5 mm, 0.5 - 1 mm and 1 - 2 mm fine root were different, the transfer models for N and P of 〈 0.5 mm fine root were releasing, but N and P of 0.5 - 2 mm fine root appeared enriching stage during the decomposition process. [ Conclusion ] Fine root decomposition rate of Pinus massoniana and soil temperature significantly positivel correlated, andy decomposition rate and diameter significantly negatively correlated; In decomposition process, different nutrient elements of different root diameter performance status were different, or enrichment, or release.