阔叶红松林不同演替阶段土壤有效氮特征及团聚体稳定性  

Characteristics of Soil Available Nitrogen and Aggregate Stability in Different Succession Stages of the Broad-leaved Pinus koraiensis Forest

作　　者：霍浩然 陈立新[1] 段文标[1] 王亚飞 费盛林 Huo Haoran;Chen Lixin;Duan Wenbiao;Wang Yafei;Fei Shenglin(Northeast Forestry University,Harbin 150040,P.R.China)

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《东北林业大学学报》2025年第6期98-105,共8页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(31770656、31670627);中央高校基本科研业务费专项资金项目(2572021DT04)。

摘　　要：为探究林分演替对土壤有效氮分布特征以及团聚体稳定性的影响,采用时空替代法,对黑龙江凉水国家级自然保护区阔叶红松林4个演替阶段(先锋、中期、稳定、顶极阶段)的样地进行取样,分析土壤全氮(TN)、各形态有效氮以及团聚体分布特征。结果表明:随森林进展演替进行,在各演替阶段,土壤深度(h)为0<h≤40 cm土层TN质量分数为2.63~7.53 g·kg^(-1);表层(0<h≤10 cm)土壤TN质量分数呈先上升后下降的趋势,其在稳定阶段最高,较先锋阶段增加了2.41 g·kg^(-1)。4个演替阶段中,各有效氮形态也呈先升后降的趋势,且均在稳定阶段达到峰值,该阶段较演替初期,土壤微生物生物量氮(MBN)增长量为122.96 mg·kg^(-1),可溶性氮增长量为66.436 mg·kg^(-1)。各演替阶段无机氮供应形态主要为NH_(4)^(+)-N。土壤表层大团聚体质量占比、平均质量直径(M WD)及几何平均直径(G WD)也呈先升后降的规律,其中,稳定阶段大团聚体质量占比较先锋阶段增加了6.95%,M WD及G WD分别增加了6.76%、9.52%。冗余分析表明,可溶性氮(TSN)、MBN与M WD、G WD的相关性最强(P<0.05),其对M WD、G WD的贡献率分别为38.1%、13.5%。在阔叶红松林进展演替过程,稳定阶段的土壤TN、有效氮供应能力及团聚体稳定性最强,演替后期有所下降。MBN、TSN对提高土壤有效氮供应能力与土壤团聚体稳定性有较大影响。To explore the influence of forest stand succession on the distribution characteristics of soil available nitrogen and the stability of soil aggregates,the spatial-temporal substitution method was adopted.Samples were collected from the plots in the four succession stages(pioneer stage,middle stage,stable stage,and climax stage)of the broad-leaved Pinus koraiensis forest in Liangshui National Nature Reserve,Heilongjiang Province.The distribution characteristics of soil total nitrogen(TN),various forms of available nitrogen,and soil aggregates were analyzed.The results showed that with the progression of forest succession,in each succession stage,the mass fraction of TN in the soil layer with a soil depth(h)of 0<h≤40 cm was 2.63-7.53 g·kg^(-1).The mass fraction of TN in the surface soil layer(0<h≤10 cm)first increased and then decreased,reaching the highest value in the stable stage,which was 2.41 g·kg^(-1)higher than that in the pioneer stage.Among the four succession stages,the contents of various forms of available nitrogen also showed a trend of first increasing and then decreasing,and all reached the peak value in the stable stage.Compared with the initial stage of succession,the increase in soil microbial biomass nitrogen(MBN)in this stage was 122.96 mg·kg^(-1),and the increase in soluble nitrogen was 66.436 mg·kg^(-1).The main form of inorganic nitrogen supply in each succession stage was NH_(4)^(+)-N.The mass proportion of macro-aggregates in the surface soil,the mean weight diameter(M WD),and the geometric mean diameter(G WD)also showed a pattern of first increasing and then decreasing.Among them,the mass proportion of macro-aggregates in the stable stage was 6.95%higher than that in the pioneer stage,and the M WD and G WD increased by 6.76%and 9.52%respectively.Redundancy analysis showed that TSN and MBN had the strongest correlation with M WD and G WD(P<0.05),and their contribution rates to M WD and G WD were 38.1%and 13.5%respectively.During the progression of succession in the broad-leaved P.k

关 键 词：阔叶红松林 次生演替 氮形态 有效氮 团聚体稳定性 

分 类 号：S754.1[农业科学—森林经理学]