凋落物处理对大兴安岭多年冻土区白桦林土壤磷组分的影响  

Effect of litter treatment on soil phosphorus components of Betula platyphylla forest in permafrost region of the Greater Khingan Mountains

作　　者：赵佳龙 满秀玲[1,2] 高明磊 刘巧娟 ZHAO Jiaong;MAN Xiuing;GAO Mingei;LIU Qiaojuan(Foresty College,Northeast Forestry University,Harbin 150040,China;Key Laboratory of Sustainable Forest Ecosystem Management of Ministry of Education,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学林学院,黑龙江哈尔滨150040 [2]东北林业大学森林生态系统可持续经营教育部重点实验室,黑龙江哈尔滨150040

出　　处：《冰川冻土》2024年第3期1043-1054,共12页Journal of Glaciology and Geocryology

基　　金：国家重点研发计划项目(2021YFD2200405)资助。

摘　　要：磷是植物生长发育过程中必不可少的元素,探究大兴安岭多年冻土区凋落物输入变化对不同林龄白桦林土壤磷组分的影响,能够为气候变化条件下高纬度地区森林生态系统磷有效性及影响机制研究提供参考。本文选择大兴安岭多年冻土区不同林龄(30 a、45 a、66 a)白桦林为研究对象,于2021年10月分别进行了凋落物去除和凋落物加倍处理,在2022年8月进行取样,采用Hedley磷分级法对0~20 cm土层土壤磷组分及环境因子进行测定与分析,探究凋落物对多年冻土区森林土壤磷组分的影响。结果表明,凋落物加倍处理提高了3个林龄白桦林土壤活性磷和中等活性磷含量,其中30 a白桦林0~10 cm土层土壤H2O-Pi含量增加显著(P<0.05),3个林龄白桦林10~20 cm土层土壤NaHCO_(3)-Pi含量均显著增加(P<0.05),30 a白桦林0~20 cm土层土壤NaOH-Pi含量显著增加(P<0.05)。而去除凋落物处理降低了3个林龄白桦林土壤活性磷和中等活性磷含量,其中,30 a和45 a白桦林各土层土壤NaOH-Pi含量显著下降(P<0.05),66 a白桦林0~20 cm土层土壤磷含量下降程度各不相同。凋落物处理对稳定态磷(HCl-Pi、HCl-Po、Residual-P)影响相对较小。冗余分析表明,30 a白桦林土壤磷组分主要受pH和可溶性有机碳的影响,45 a白桦林主要受pH和NO_(3)--N的影响,而66 a白桦林主要受土壤含水率和可溶性有机碳的影响。凋落物输入增加会促进寒温带白桦林土壤磷的活性,提高土壤磷的有效性。因此,在白桦林经营管理过程中,要保护好凋落物。Phosphorus is essential for plant growth and development,existing in various forms in the soil.These different forms of phosphorus vary in their mobility and biological availability.In forest ecosystems,the return of nutrients through litter is crucial for maintaining the dynamic balance of soil phosphorus.With climate warm-ing,changes in the amount of litter in forests are expected,particularly in cold region of China,where signifi-cant variations are anticipated.To investigate the effects of litter on soil phosphorus components in Betula platy-phylla forests in the permafrost region of the Greater Khingan Mountains,this study employed methods of litter addition and removal to analyze the characteristics of soil phosphorus components following alterations in litter and identify influencing factors.The aim is to provide theoretical references for researching soil phosphorus availability and influencing mechanisms in forest ecosystems in the permafrost region.This study selected Betu-la platyphylla forests of different ages(30 a,45 a,and 66 a)in the permafrost region of the Greater Khingan Mountains as the study site.In October 2021,three sample plots measuring 20 m×30 m were established in typi-cal areas of Betula platyphylla forests of different ages.Within each plot,three sample plots measuring 2 m×2 m were designated for litter removal and litter doubling treatments,alongside three control plots with no interven-tion.In August 2022,soil samples were collected from the 0~5,5~10,and 10~20 cm soil layers.The Sui’s modified Hedley phosphorus classification method was used to determine the eight phosphorus components.These components were categorized into three groups based on their ease of absorption and utilization by plants:easily-available phosphorus(H2O-Pi,NaHCO_(3)-Pi,and NaHCO_(3)-Po),moderately-available phosphorus(NaOH-Pi and NaOH-Po),and stable phosphorus(HCl-Pi,HCl-Po,and Residual-P)to explore the effects of litter addi-tion and removal on soil phosphorus components in Betula platyphylla forests of d

关 键 词：多年冻土区 次生林 凋落物 土壤活性磷 林龄 

分 类 号：S714.2[农业科学—林学]