生态学报2024，Vol.44Issue(13)：5494-5507,14.DOI:10.20103/j.stxb.202310172260
黄土高原不同人工林型微生物残体碳对土壤有机碳组分的积累贡献及影响因素
Contributions of microbial necromass carbon to soil organic carbon fractions accumulation and influencing factors under different artificial forest types on the Loess Plateau
摘要
Abstract
To explore contributions of microbial necromass carbon(MNC)to soil organic carbon(SOC)fractions under different artificial forest types,Robinia pseudoacacia,Armeniaca sibirica,and Pinus tabuliformis plantations on the Loess Plateau were selected as the study objectives.Then contributions of fungal necromass carbon(FNC),bacterial necromass carbon(BNC),and MNC to particulate organic carbon(POC)and mineral-associated organic carbon(MAOC)at 0-60 cm soil layers as well as its influencing factors under three artificial forest types were analyzed.Results showed that(1)contents of BNC,FNC,and MNC in POC and MAOC degraded with increasing of the soil layer depth under three types of artificial forest.(2)Contributions of MNC to MAOC accumulation under Robinia pseudoacacia and Armeniaca sibirica plantations were 60.9％and 52.0％,which were higher than that of POC(33.5％and 49.5％).The contributions of FNC to MAOC accumulation were 4.4 and 2.5 times that of BNC.For the Pinus tabuliformis plantation,contribution of MNC to POC accumulation at 0-10 cm soil layer was 73.8％,which was higher than that of MAOC(48.2％).And contribution of FNC to POC accumulation was 3.5 times that of BNC.However,at 10-60 cm soil layer,contribution of MNC to MAOC accumulation was 30.9％,which was higher than that of POC(24.4％).And contribution of FNC to MAOC accumulation was 3.4 times that of BNC.(3)There existed significantly positive correlations between SOC,total nitrogen contents and MNC/POC,MNC/MAOC(P＜0.05).Clay content was positively correlated with MNC/MAOC significantly(P＜0.05).However,pH value and sand content were negatively correlated with MNC/MAOC significantly(P＜0.05).These results suggested that on the Loess Plateau,MNC at 0-60 cm soil layers mainly contributed to MAOC accumulation under three types of plantations,except for that in Pinus tabuliformis plantation at 0-10 cm soil layer.Compared to BNC,contribution of FNC to SOC fractions accumulation was higher.Contents of SOC,total nitrogen,clay,and sand as well as pH value were the major factors to affect contributions of MNC to SOC fractions accumulation.关键词
微生物残体碳/颗粒态有机碳/矿物结合态有机碳/人工林/黄土高原Key words
microbial necromass carbon/particulate organic carbon/mineral-associated organic carbon/artificial forests/Loess Plateau引用本文复制引用
窦艳星,王宝荣,廖娇娇,薛志婧,侯琳,安韶山,张硕新..黄土高原不同人工林型微生物残体碳对土壤有机碳组分的积累贡献及影响因素[J].生态学报,2024,44(13):5494-5507,14.基金项目
陕西省自然科学基础研究计划青年项目(2023-JC-QN-0228) （2023-JC-QN-0228）
陕西省博士后基金"特别资助"项目(2023BSHTBZZ27) （2023BSHTBZZ27）
中央高校基本科研业务费专项资金项目(2452021018) （2452021018）
