文献类型：期刊文献

中文题名：氮添加对水杉防护林生长的影响

英文题名：Effects of Nitrogen Addition on the Growth of Metasequoia glytostroboides Shelterbelt

作者：姚洪锡[1] 冯坤乔[2] 童冉[3,4] 原文文[3,4] 吴统贵[3,4] 朱念福[3,4]

第一作者：姚洪锡

机构：[1]荣成市国有成山林场,山东威海264300;[2]江苏省东台市林场,江苏东台224200;[3]中国林业科学研究院亚热带林业研究所,浙江杭州311400;[4]国家林业和草原局华东沿海防护林生态系统定位观测研究站,浙江杭州311400

年份：2024

卷号：37

期号：5

起止页码：186-194

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2023】；CSCD:【CSCD2023_2024】；

基金：浙江省科技计划项目(2022C02053);国家自然科学基金项目(33201632,31770756)。

语种：中文

中文关键词：氮添加;水杉防护林;胸径年生长量;小树;大树

外文关键词：nitrogen addition;Metasequoia glyptostroboides shelterbelt;DBH annual growth;small tree;large tree

分类号：S750

摘要：[目的]在我国大气氮沉降量逐年增加背景下,厘清外源氮素输入对水杉防护林生长的影响,有助于为防护林健康生长开展养分管理提供科学指导。[方法]以江苏省东台市泥质海岸12年生水杉(Metasequoia glyptostroboides)防护林为研究对象,通过设置4个水平的连续8 a氮添加处理,即对照(CK,0 kg·hm^(-2)·a^(-1))、低氮(LN,56 kg·hm^(-2)·a^(-1))、中氮(MN,168 kg·hm^(-2)·a^(-1))和高氮(HN,280 kg·hm^(-2)·a^(-1)),研究氮添加对水杉及其大小树(根据初始平均胸径划分)胸径年生长量的影响。[结果]氮添加水平和年份及其交互作用显著影响水杉胸径年生长量。氮添加对水杉胸径年生长量呈非线性影响,中氮添加的促进作用强于低氮和高氮。年际间水杉胸径生长量的变化趋势一致:初期氮添加促进作用逐渐增强(1—3年氮添加),然后促进逐渐减弱(4—6年氮添加),继而转变为抑制作用(7—8年氮添加)。在同水平氮添加处理下,径级和年份显著影响水杉生长,但无交互作用。对于小树,氮添加水平和年份及其交互作用显著影响胸径生长。对于大树,仅氮添加年份显著影响胸径生长。水杉小树的胸径年生长量低于大树,而生长量响应比则高于大树。[结论]同水平氮添加处理下,水杉大树胸径生长量高于小树,但氮添加对小树胸径生长的促进作用强于大树,表明小树生长更易受外源氮输入的调控。同时,随着年份增加,氮添加对水杉胸径生长表现出先促进后抑制,表明长期氮沉降将不利于泥质海岸水杉防护林生长。
[Objective]In the context of increasing atmospheric nitrogen deposition in China,clarifying the effects of exogenous nitrogen input on the growth of Metasequoia glyptostroboides shelterbelts is helpful,which is beneficial for providing scientific guidance for nutrient management to support the healthy growth of shelterbelts.[Method]The study focused on 12-year-old Metasequoia glyptostroboides shelterbelt on the muddy coast of Dontai City,Jiangsu Province,China,by applying four levels of continuous nitrogen addition treatments over eight years,including a control treatment(CK,0kg·hm^(-2)·a^(-1)),low nitrogen addition(LN,56 kg·hm^(-2)·a^(-1)),medium nitrogen addition(MN,168 kg·hm^(-2)·a^(-1)),and high nitrogen addition(HN,280 kg·hm^(-2)·a^(-1)),to investigate the effect of nitrogen addition on annual growth of the diameter at breast height(DBH)of Metasequoia glyptostroboides,and the its large trees and small trees(classified based on initial average DBH).[Result]Nitrogen addition level,year,and their interaction,significantly affected the DBH annual growth of Metasequoia glyptostroboides.Nitrogen addition had a non-linear impact on the DBH annual growth of Metasequoia glyptostroboides,and the promotion effect of medium nitrogen addition was stronger than those of low and high nitrogen levels.The trends in DBH annual growth of Metasequoia glyptostroboides was consistent across years:the promotion effect of nitrogen addition gradually increased in the early stage(nitrogen addition in 1-3 years),then the promotion gradually weakened(nitrogen addition in 4-6 years),and then turned into an inhibitory effect(nitrogen addition in 7-8 years).Under the same nitrogen addition treatment level,DBH class and year significantly affected growth of Metasequoia glyptostroboides but there was no interaction.For small trees,nitrogen addition level,year,and their interaction significantly affected DBH growth.For large trees,only the year of nitrogen addition significantly affected DBH growth.The DBH annual growth of small trees was lower than that of large trees,while their response to growth(lnRR)was higher than that of large trees.[Conclusion]The DBH growth of large trees is higher than small ones of Metasequoia glyptostroboides,but the promoting effect of nitrogen addition on the DBH growth of small trees is stronger than that on large trees,indicating that the growth of small trees is more easily influenced by exogenous nitrogen input.At the same time,with the increase of years,nitrogen addition first promotes and then inhibits the DBH growth of of Metasequoia glyptostroboides,suggesting that long-term nitrogen deposition will be unfavorable to the growth of Metasequoia glyptostroboides shelterbelts along the muddy coastal areas.