氮、磷添加对亚热带毛竹林土壤水稳性团聚体及有机碳分布的影响  

Effects of Nitrogen and Phosphorus Addition on Soil Water-Stable Aggregates and Organic Carbon Distribution in Moso Bamboo Forests in Subtropical China

作　　者：臧艳 向宇轩 刘娟[1] 姜培坤[1] 吴家森[1] 李永夫[1] Zang Yan;Xiang Yuxuan;Liu Juan;Jiang Peikun;Wu Jiasen;Li Yongfu(Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration State Key Laboratory of Subtropical Silviculture College of Carbon Neutrality,College of Environmental and Resource Sciences,Zhejiang A&F University,Hangzhou 311300)

机构地区：[1]浙江农林大学环境与资源学院、碳中和学院亚热带森林培育国家重点实验室浙江省森林生态系统碳循环与固碳减排重点实验室,杭州311300

出　　处：《林业科学》2024年第7期8-16,共9页Scientia Silvae Sinicae

基　　金：浙江省大学生科技创新活动计划暨新苗人才计划资助项目(2022R412A008);国家自然科学基金项目(31700540)。

摘　　要：[目的]研究氮(N)、磷(P)添加对亚热带毛竹林土壤水稳性团聚体及土壤有机碳(SOC)分布的影响,揭示毛竹林SOC对N、P添加的响应特征,为N沉降背景下毛竹林固碳增汇提供数据支持。[方法]以NH_(4)NO_(3)为N源、NaH_(2)PO_(4)为P源,设置不同N、P添加量的4个处理:CK(0 kg·hm^(-2)a^(-1)N+0 kg·hm^(-2)a^(-1)P)、N(120 kg·hm^(-2)a^(-1)N)、P(120 kg·hm^(-2)a^(-1)P)和NP(120 kg·hm^(-2)a^(-1)N+120 kg·hm^(-2)a^(-1)P),3年后分析N、P添加对毛竹林土壤0~20、20~40和40~60 cm土层不同粒级(>2、0.25~2、0.053~0.25和<0.053 mm)团聚体含量、平均重量直径(MWD)、几何平均直径(GMD)及其SOC分布的影响。[结果]1)各土层土壤水稳性团聚体均以大团聚体(>0.25 mm)为主,各处理大团聚体含量均随土层加深而降低,微团聚体(<0.25mm)含量随土层加深而增加。在0~20cm土层,N处理显著增加微团聚体含量,对大团聚体含量无显著影响;P处理对团聚体组成无显著影响;NP处理显著增加微团聚体含量、降低大团聚体含量;各处理对水稳性团聚体MWD和GMD均无显著影响。在20~40和40~60cm土层,与CK相比,各处理均呈大团聚体含量降低、微团聚体含量增加的趋势。在20~40 cm土层,P处理显著降低水稳性团聚体MWD和GMD,N处理对水稳性团聚体MWD和GMD无显著影响,NP处理显著降低水稳性团聚体MWD,对水稳性团聚体GMD无显著影响;在40~60 cm土层,各处理均显著降低水稳性团聚体MWD和GMD。2)与CK相比,N、P处理显著降低各土层SOC含量;NP处理对0~20和20~40 cm土层SOC含量均无显著影响,但显著降低40~60 cm土层SOC含量。3)N处理对0~20和40~60cm土层土壤团聚体SOC贡献率均无显著影响,仅增加20~40cm土层土壤大团聚体SOC贡献率、降低微团聚体SOC贡献率;NP处理显著降低各土层大团聚体SOC贡献率、增加微团聚体SOC贡献率;P处理对团聚体SOC贡献率的影响在20~40和40~60 cm土层与NP处理对其的影响趋势一致,对0~20 cm土[Objective]This study aims to investigate the effects of nitrogen(N)and phosphorus(P)addition on soil water-stable aggregates and soil organic carbon(SOC)distribution in moso bamboo forest in subtropical China,and reveal the response of soil SOC in bamboo forest to N and P addition,providing data support for carbon sequestration and sink enhancement in bamboo forest under N deposition background.[Method]In this study,NH_(4)NO_(3)was used as N source,NaH_(2)PO_(4)was used as P source and 4 treatments(CK:0 kg·hm^(-2)a^(-1)N+0 kg·hm^(-2)a^(-1)P,N:120 kg·hm^(-2)a^(-1)N,P:120 kg·hm^(-2)a^(-1)P,NP:120 kg·hm^(-2)a^(-1)N+120 kg·hm^(-2)a^(-1)P)were set.After N and P addition for 3 years,changes of different particle size(>2,0.25−2,0.053−0.25,and<0.053 mm)composition,mean weight diameter(MWD),geometric mean diameter(GMD)and SOC content were investigated.[Result]1)The content of water-stable aggregates in each soil layer was mainly macro-aggregates(>0.25 mm),and the content of macro-aggregates decreased with the increase of soil depth,while the content of micro-aggregates(<0.25 mm)increased with the increase of soil depth.In 0-20 cm soil layer,N treatment significantly increased the content of micro-aggregates,but had no significant effect on the content of macro-aggregates;P treatment had no significant effect on aggregate composition;NP treatment significantly increased the content of micro-aggregates and decreased the content of macro-aggregates;each treatment has no significant effect on MWD and GMD of water-stable aggregates.In 20-40 and 40-60 cm soil layer,the content of macro-aggregate decreased and the content of micro-aggregate increased in each treatment.In 20-40 cm soil layer,P treatment significantly reduced the MWD and GMD of water-stable aggregates,N treatment had no significant effect on MWD and GMD of water-stable aggregates,NP treatment significantly reduced the MWD of water-stable aggregates,and had no significant effect on GMD of water-stable aggregates.In 40-60 cm soil layer,each treatment sign

关 键 词：氮沉降 磷添加 水稳性团聚体 有机碳 

分 类 号：S714[农业科学—林学]