土壤增温和氮沉降对杉木幼树叶片和土壤化学计量特征的影响  

Effects of soil warming and nitrogen deposition on leaf and soil stoichiometric characteristics of Cunninghamia lanceolata saplings

作　　者：王小南 熊德成[1,2,3] 周嘉聪 陈娟 刘小飞[1,2,3] 杨智杰 WANG Xiaonan;XIONG Decheng;ZHOU Jiacong;CHEN Juan;LIU Xiaofei;YANG Zhijie(Fujian Provincial Key Laboratory for Plant Eco-physiology,Fujian Normal University,Fuzhou 350007,China;School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China;Fujian Sanming Forest Ecosystem National Observation and Research Station,Sanming 365000,China)

机构地区：[1]福建师范大学福建省植物生理生态重点实验室,福州350007 [2]福建师范大学地理科学学院,福州350007 [3]福建三明森林生态系统国家野外科学观测研究站,三明365000

出　　处：《应用与环境生物学报》2022年第6期1557-1563,共7页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(31930071、31901132);国家重大基础研究计划课题(2014CB954003)资助。

摘　　要：全球变化背景下升温和氮沉降直接或间接影响植物—土壤元素循环过程.设置对照(CT)、增温(W,+4℃)、氮沉降(N,40 kg hm-2a-1)、增温和氮沉降交互(WN)4种处理,探究增温和氮沉降对杉木(Cunninghamia lanceolate)幼树叶片和土壤碳(C)、氮(N)、磷(P)及其化学计量比的影响.结果表明:(1)与CT相比,W处理使叶片P含量显著减少54.54%,使叶片C/P和N/P分别显著增加85.26%和83.39%;WN处理使叶片C含量和P含量分别显著降低1.99%和51.03%,叶片C/P显著增加68.01%;各处理间叶片N含量无显著差异.各处理的叶片N/P均小于10,W、WN处理较CT处理更接近10;同时,W、WN处理的树高显著增加.(2)各处理间土壤总碳(TC)、总氮(TN)和总磷(TP)含量均无显著差异;与CT相比,W处理使土壤C/N显著降低4.09%,而W、WN处理均未影响土壤C/P和N/P. W处理下土壤速效养分含量较CT处理高.(3)相关分析表明,CT处理下杉木叶片N含量与土壤C/N呈显著负相关;W处理下叶片N含量和N/P分别与土壤TN和TP含量呈显著正相关;N处理下叶片N含量与土壤TC和TN含量呈显著负相关;WN处理下叶片与土壤C、N、P及其化学计量特征均没有显著相关性.本研究表明杉木幼树仍存在N限制,增温及其与氮沉降交互处理缓解了杉木N限制,促进杉木生长.(图5表3参41)Warming and nitrogen deposition directly or indirectly affect the plant-soil element cycle under global change. To examine the effects of warming and nitrogen deposition on leaf and soil carbon(C), nitrogen(N), phosphorus(P) contents, and their stoichiometric ratios in Cunninghamia lanceolata saplings, four types of treatments were assigned: control(CT), warming(W, + 4.C), nitrogen deposition(N, 40 kg ha-1a-1), and warming + nitrogen deposition(WN) treatments. The results showed that:(1) compared with CT, W treatment significantly decreased leaf P content by 54.54% and increased leaf C/P and N/P by 85.26% and 83.39%,respectively;WN treatment significantly decreased leaf C content and P content by 1.99% and 51.03%,respectively, but increased the leaf C/P by 68.01% with no significant differences in leaf N content among treatments. The leaf N/P ratio of each treatment was less than 10, but that of the W and WN treatments were closer to 10 than that of the CT treatment. Meanwhile, W and WN treatments significantly increased tree height.(2) No significant differences were observed in soil total carbon(TC), total nitrogen(TN), and total phosphorus(TP) contents among treatments. Compared with CT, W treatment significantly decreased soil C/N by 4.09%,while neither W nor WN treatment affected soil C/P and N/P. W treatment increased the available soil content compared to CT treatment.(3) The correlation analysis showed that leaf N content was significantly negatively correlated with soil C/N in the CT treatment;in the W treatment leaf N content and N/P were significantly positively correlated with soil TN and TP content, respectively. Leaf N content was significantly negatively correlated with soil TC and TN in the N treatment, and leaf contents had no significant correlation with soil C, N,and P contents or their stoichiometric characteristics in the WN treatment. This study showed that N limitation still exists in C. lanceolata saplings. Warming and the interaction between warming and nitrogen deposition could alleviate

关 键 词：中亚热带 杉木 增温 氮沉降 化学计量特征 养分限制 

分 类 号：S791.27[农业科学—林木遗传育种] S714.2[农业科学—林学]