文献类型：期刊文献

中文题名：CO_(2)升高和施氮互作对木荷幼苗生理特性的影响

英文题名：Interactive Effects of Elevated CO_(2) and Nitrogen Fertilization on Physiological Characteristics of Schima superba Seedings

作者：冯永霞[1] 尚鹤[1] 曹吉鑫[2] 倪秀雅[1] 陈展[1]

第一作者：冯永霞

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所/国家林业和草原局森林生态环境重点实验室,北京100091;[2]北京市园林绿化科学研究院,北京100044

年份：2022

卷号：31

期号：9

起止页码：1773-1782

中文期刊名：生态环境学报

外文期刊名：Ecology and Environmental Sciences

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家重点研发计划项目(2016YFD0600202-3);国家自然科学基金项目(31800526)。

语种：中文

中文关键词：木荷;CO_(2)浓度升高;施氮;光合色素;内源激素

外文关键词：Schima superba;increased CO_(2)concentration;nitrogen fertilization;photosynthetic pigments;endogenous hormones

分类号：S718.45;X173

摘要：CO_(2)浓度升高与氮(N)沉降增加的交互作用对陆地生态系统的影响已成为全球变化研究的热点。大量研究报道了CO_(2)浓度升高和氮沉降对生态系统的影响,但关于高浓度CO_(2)以及N肥对木本植物的影响研究还很少。该研究拟探讨高浓度CO_(2)和N添加对木荷(Schima superba)幼苗生理特性的影响,以了解木荷幼苗生理生态对未来气候变化的响应机制。利用开顶室气室(open top chambers,OTC)组成的CO_(2)浓度自动调控平台,以一年生木荷幼苗为研究材料,根据联合国政府间气候变化专门委员会(Intergovernmental Panel on Climate Chang,IPCC)第五次评估报告预测的未来CO_(2)浓度升高情景,设置550、750、1000μmol·mol^(?1)共3个CO_(2)熏气处理,以自然大气CO_(2)浓度(约400μmol·mol^(?1),CK)为对照,在每个OTC内设置不施氮(低氮,0 g·m^(?2)·a^(?1))和施氮(高氮,10 g·m^(?2)·a^(?1))2个氮肥处理水平,研究CO_(2)浓度升高和施用氮肥及其交互作用对木荷幼苗生理生态特征的影响。结果表明,(1)除1000μmol·mol^(?1) CO_(2)处理外,其他CO_(2)处理水平下高氮处理后木荷幼苗叶片光合色素含量较低氮处理显著增加(P<0.05)。(2)CO_(2)浓度和施氮对丙二酮(MDA)活力无显著影响,但施氮却抑制了超氧化物岐化酶(SOD)活力(P<0.001)。(3)CO_(2)浓度增加对脱落酸(ABA)含量无显著影响,但对生长素(IAA)含量有促进作用(P=0.003),施氮对玉米素(ZR)、赤霉素(GA3)有抑制作用(P<0.001)。(4)施氮和CO_(2)浓度升高对植物的总生物量有促进作用。高氮条件下,1000μmol·mol^(?1) CO_(2)处理木荷幼苗的总生物量较CK处理增加了52.79%(P=0.044)。1000μmol·mol^(?1) CO_(2)处理下,高氮与低氮处理相比,木荷生物量增加了106.38%(P=0.003)。大气CO_(2)浓度升高和施氮处理对木荷幼苗叶片的色素、抗氧化系统、激素含量的交互作用不显著,而施氮能显著提高光合色素含量,并显著提高IAA含量,降低ZR含量,且高氮处理下CO_(2)摩尔分数达到1000μmol·mol^(?1)时木荷幼苗生物量显著提高。
The interactive effects of elevated CO_(2) concentration and increased N deposition on terrestrial ecosystems have become a hot topic in global change research.Before the industrial revolution,the CO_(2) concentration on the earth was about 280μmol·mol^(?1),and it has already reached 416μmol·mol^(?1).The Intergovernmental Panel on Climate Change(IPCC)report of the United Nations proposed that by 2100,the atmospheric CO_(2) concentration will appear in four scenarios under different emission reduction measures:430?480μmol·mol^(?1),580?720μmol·mol^(?1),720?1000μmol·mol^(?1) and above 1000μmol·mol^(?1).At the same time,N deposition is a global environmental problem,and China has become the third largest nitrogen deposition area.Studies showed that atmospheric nitrogen deposition is about 19 Tg·N·a^(?1) on a global scale.Atmospheric nitrogen deposition is predicted to increase rapidly in the coming decades.There are very few studies about the effects of higher CO_(2) concentration(e.g.1000μmol·mol^(?1))integrated with N fertilization on woody plant.In this study,Schima superba seedlings with one year old were exposed to ambient air or elevated CO_(2)(eCO_(2))and N fertilization in open-top chambers(OTC).According to the fifth assessment report of IPCC,three eCO_(2) concentration gradients of 1000,750 and 550μmol·mol^(?1),with ambient air as control(CK,about 400μmol·mol^(?1)),were set,and two N fertilization treatments(low N,0 g·m^(?2)·a^(?1) and high N,10 g·m^(?2)·a^(?1))were performed in each OTC.The effects of eCO_(2),N fertilization and their interaction on the physiological and ecological characteristics of Schima superba seedlings were studied.The results showed that:(1)Except for the 1000μmol·mol^(?1) CO_(2) treatment,the photosynthetic pigment content in the leaves of Schima superba was significantly increased by high nitrogen compared to that in the low nitrogen treatment(P<0.05).(2)ECO_(2) and N fertilization had no significant effect on the total amount of MDA,but N fertilization inhibited the activity of SOD(P<0.001).(3)ECO_(2) concentration improved the content of IAA(P=0.003),and N fertilization had an inhibitory effect on ZR and GA3(P<0.001).(4)N fertilization and ECO_(2) promoted the total biomass of plants.Under high nitrogen conditions,the CO_(2) concentration of 1000μmol·mol^(?1) increased the total biomass of the Schima superba seedlings by 52.79%(P=0.044)compared with the CK treatment.The biomass of the Schima superba was increased under high N compared with low N by 106.38%(P=0.003)in 1000μmol·mol^(?1) CO_(2) treatments.In conclusion,the interaction between elevated CO_(2) concentration and N deposition on the pigment,antioxidant system and hormone content of leaves of Schima superba seedlings was not obvious.However,nitrogen application can significantly increase the content of photosynthetic pigmentsand IAA,and reduce the content of ZR.The high nitrogen treatment can significantly increase the biomass of Schima superba seedlings at the CO_(2) concentration of 1000μmol·mol^(?1).