文献类型：期刊文献

中文题名：温带过渡区典型天然林林型土壤有机碳物理组分变化特征及其影响因素

英文题名：Variation of soil organic carbon physical fractions and their main influencing factors under four typical natural forest types in a temperate transition area in Western of Taiyuan City,China

作者：胡璟[1] 吕世琪[3] 胡宗达[1] 马志波[2] 殷建章[1] 符利勇[2] 肖玖金[4] 闫佳源[1] 李冰[1]

第一作者：胡璟

机构：[1]四川农业大学资源学院,成都611130;[2]中国林业科学研究院资源信息研究所,北京100091;[3]山西文峪河国家级湿地公园管理局,吕梁030500;[4]四川农业大学林学院,成都611130

年份：2025

卷号：45

期号：19

起止页码：9712-9726

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：;北大核心:【北大核心2023】；

基金：“十四五”国家重点研发计划(2021YFD2200405);湿地生态恢复与保育四川省重点实验室开放课题资助课题(2024KFKT03)。

语种：中文

中文关键词：林型;土壤有机碳;物理组分;颗粒有机碳;矿物结合态有机碳;温带过渡区

外文关键词：forest types;soil organic carbon;physical fractions;particulate organic carbon;mineral-associated organic carbon;temperate transition area

分类号：S714.2

摘要：温带森林作为陆地生态系统的主要组分,在全球碳(C)固持和减缓全球气候变化方面发挥着重要作用。以往研究主要集中在森林土壤有机碳(SOC)及其活性组分方面,而对土壤颗粒有机碳(POC)和矿物结合态有机碳(MOC)对不同林型的响应尤其是温带过渡区的关注较少。为此,选择了中温带到暖温带过渡区的白桦林(BP)、青扦+华北落叶松+桦木针阔混交林(PLB)、白扦+青扦针叶混交林(PP)和华北落叶松林(LP)4种典型天然林土壤为对象,探究其POC和MOC的变化特征及其主导影响因素。结果表明:(1)林型对SOC和全氮(TN)含量影响显著,对全磷(TP)、铵态氮(AN)和硝态氮(NN)影响不显著。(2)林型对POC含量影响显著,对MOC含量影响不显著,二者变化趋势均为PP>PLB>BP>LP,其中PP的POC含量显著高于LP而与其他2种林型差异不显著;而MOC含量在不同林型间未见显著差异。(3)林型对POC/SOC、MOC/SOC和POC/MOC影响显著,其中POC/SOC和POC/MOC表现为LP>BP>PLB>LP,其变幅分别为21.48%—28.95%和29.01%—43.89%;MOC/SOC表现为LP>PLB>PP>BP(变幅为65.75%—74.38%)。随机森林分析结果表明,POC主要受TN、NN和TP显著影响,而MOC则主要受BD、TN和NN显著影响;冗余分析(RDA)结果显示,TN和NN是驱动SOC及其物理组分变化的主要因素。综上,MOC是SOC累积的主要组分,且PP的含量最高,但LP的土壤C稳定性显著优于其他林型;土壤氮磷元素的相互作用在预测温带过渡区森林土壤POC和MOC含量起着主导作用。因此,未来的森林管理应考虑种植固氮物种,进而提升林地土壤质量和有机C固存,以减缓全球气候变化。
Temperate forests,as a dominant terrestrial ecosystem,play a pivotal role in global carbon sequestration and climate change mitigation.Previous studies have elucidated the changes of soil organic C(SOC)and its active fractions in bulk soil,but paid little attention to particulate organic C(POC)and mineral-associated organic C(MOC)within aggregates in different forest types,especially in temperate transition area.Here,we collected top(0—20cm)mineral soil from four typical temperate natural forests i.e.,Betula platyphylla forest(BP),Picea wilsonii+Larix principis-rupprechtii+Betula.app mixed conifer-broad leaf forest(PLB),P.meyeri+P.wilsonii mixed conifer forest(PP)and L.principisrupprechtii forest(LP)in the Pangquangou National Nature Reserve,Shanxi Province,China.Physicochemical properties were investigated in soil from these forest types for analyzing the relationship with SOC physical fractions(POC and MOC).We founded that:(1)Forest type significantly affected the content of SOC and total nitrogen(TN)with the highest in the PP(65.31 and 3.65 g/kg,respectively)and lowest in the LP(38.61 and 1.79 g/kg,respectively),but the response of the total phosphorus(TP),ammonium nitrogen(AN)and nitrate nitrogen(NN)to forest types was not obvious.(2)Forest type significantly affected the content of POC,but did not affected the content of MOC,indicating that POC exhibited higher sensitivity to forest type shifts compared to MOC.In addition,MOC and POC contents were respectively as follows the order PP>PLB>BP>LP.We only found that POC content in the LP was considerably inferior to that of the PP(P<0.05),with no obvious differences among the other forest types.Similarly,the MOC content was the highest in the PP,whereas we observed no significant differences among the four forest types.(3)The ratios of POC/SOC,MOC/SOC,and POC/MOC were unaffected by forest type change.POC/SOC and POC/MOC ratios followed the order LP>BP>PLB>PP,ranging from 21.48%to 28.95%and 29.01%to 43.89%,respectively.MOC/SOC decreased in the order LP(74.38%)>PLB(69.27%)>PP(66.32%)>BP(65.75%),indicating that MOC was the dominant fraction of SOC.(4)Random forest analysis showed that the TN,NN and TP contents significantly impacted POC content from the temperate forest soil,while MOC content was mainly affected by BD,TN and NN contents.Moreover,Redundancy analysis(RDA)revealed that TN and NN were the main factors that controlled SOC and its physical fraction contents.Taken together these results suggested that MOC played a critical role in regulating SOC,and could accumulate SOC to the higher extents in the mixed forest especially in the needle mixed forest compared to the other pure forests.However,the C stability of coniferous forest was better than other forest types.Our findings emphasized the key role of the interplay between soil nitrogen and phosphorus in predicting POC and MOC and soil C pool in forest soil in the temperate transition zone.Future forest management strategies should consider planting nitrogen-fixing species to enhance soil organic carbon sequestration and mitigate global climate change.