杉木林土壤碳氮磷储量及化学计量特征对氮添加的响应  

Responses of stocks and stoichiometric characteristics of soil carbon,nitrogen and phosphorus to nitrogen addition in a Cunninghamia lanceolata plantation

作　　者：李思程 蔡乾坤 刘文飞[3] 吴建平[1,2] LI Si-cheng;CAI Qian-kun;LIU Wen-fei;WU Jian-ping(Yunnan Key Laboratory of Plant Reproductive Adaptation and Evolutionary Ecology,Yunnan University,Kunming 650500,Yunnan,China;Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province,School of Ecology and Environmental Science,Yunnan University,Kunming 650500,Yunnan,China;Jiangxi Key Laboratory for Restoration of Degraded Ecosystems&Watershed Ecohydrology,Nanchang Institute of Technology,Nanchang 330099,Jiangxi,China)

机构地区：[1]云南大学、云南省植物繁殖适应与进化生态学重点实验室,云南昆明650500 [2]云南大学、生态与环境学院云南省高校土壤生态与健康重点实验室,云南昆明650500 [3]南昌工程学院、江西省退化生态系统修复与流域生态水文重点实验室,江西南昌330099

出　　处：《云南大学学报（自然科学版）》2023年第6期1349-1358,共10页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金(31570444,31200406);兴滇英才支持计划(C619300AD14).

摘　　要：以亚热带杉木(Cunninghamia lanceolata)人工林为研究对象,设计对照(N0,0 kg·hm^(−2)·a^(−1))、低氮(N1,60 kg·hm^(−2)·a^(−1))、中氮(N2,120 kg·hm^(−2)·a^(−1))和高氮(N3,240 kg·hm^(−2)·a^(−1))4种模拟氮沉降处理,探究长期(10 a)氮添加处理后土壤有机碳(SOC)、全氮(TN)和全磷(TP)质量比、储量及化学计量特征的变化.结果表明氮添加(N1、N2和N3)显著提高了TN质量比和储量,与N0相比TN质量比分别增加17.31%、21.59%和25.01%;TN储量分别增加22.16%、31.64%和39.47%.氮添加处理对TP质量比和储量影响无明显规律.氮添加处理下土壤w(C):w(N)(C:N)介于8.29~14.23,w(C):w(P)(C:P)介于54.12~95.17,w(N):w(P)(N:P)介于5.16~8.91,土壤碳、氮、磷储量与土壤化学计量特征有显著相关性,SOC储量与C:N和C:P显著正相关,与N:P显著负相关;TN储量与C:P显著负相关;TP储量与C:P和N:P显著负相关.研究结果表明长期氮添加后土壤表层碳氮磷储量受土壤化学计量特征调控.该研究可为氮沉降背景下杉木人工林的可持续经营管理提供一定的科学参考.In this study,four nitrogen(N)addition treatments,i.e.,control(N0,0 kg·hm^(−2)·a^(−1)),low(N1,60 kg·hm^(−2)·a^(−1)),medium(N2,120 kg·hm^(−2)·a^(−1))and high(N3,240 kg·hm^(−2)·a^(−1))were designed to simulate nitrogen deposition in a subtropical Cunninghamia lanceolata plantation.Changes in soil organic carbon(SOC),total nitrogen(TN)and total phosphorus(TP)contents,stocks and their stoichiometric characteristics were investigated after 10-year-long N addition.The results showed that N addition significantly increased the TN content and stock.Compared to control treatment,TN contents in N1,N2 and N3 increased by 17.31%,21.59%and 25.01%;TN stocks increased by 22.16%,31.64%and 39.47%,respectively.N addition had no significant effect on TP contents and stocks.Soil C:N under N addition varied from 8.29 to 14.23,C:P ranged from 54.12 to 95.17 and N:P ranged from 5.16 to 8.91.Stocks of soil C,N and P were significantly correlated with soil stoichiometric characteristics.SOC stocks were positively correlated with C:N and C:P and negatively correlated with N:P;TN stocks were negatively correlated with C:P;TP stocks were negatively correlated with C:P and N:P.Our findings suggest that soil surface carbon,nitrogen and phosphorus stocks are regulated by soil stoichiometric characteristics after longterm N addition,and provide a scientific guidance for the forest management in Cunninghamia lanceolata plantations.

关 键 词：氮沉降 杉木人工林 土壤有机碳 氮磷比 化学计量特征 

分 类 号：S714.5[农业科学—林学]