摘要
为探讨不同连栽代次对桉树(Eucalyptus spp.)人工林土壤团聚体和土壤化学计量特征的影响,以广西第1~3代连栽桉树人工林为研究对象,分析0~20和20~40 cm土层的土壤团聚体分布特征、稳定性及有机碳(SOC)、全氮(TN)和全磷(TP)含量、储量和其化学计量特征。结果表明,不同连栽代次桉树人工林中,>2 mm粒径土壤团聚体质量百分含量均最高,0.25~1和<0.25 mm粒径土壤团聚体SOC、TN和TP含量均较高,>2 mm粒径土壤团聚体SOC、TN和TP储量均最高。在0~20和20~40 cm土层中,随连栽代次增加,>2和>1~2 mm粒径土壤团聚体质量百分含量均降低,0.25~1和<0.25 mm粒径土壤团聚体质量百分含量均升高;土壤团聚体MWD和GMD均降低,D升高;全土和不同粒径土壤团聚体SOC、TN和TP含量均降低,全土SOC、TN和TP储量均降低;>2、>1~2和0.25~1粒径土壤团聚体SOC、TN和TP储量大多呈下降趋势,<0.25 mm粒径土壤团聚体SOC、TN和TP储量均呈上升趋势。桉树人工林土壤C分解和矿化速率较快,土壤P有效性较高,土壤受N限制。RDA和PLS-SEM结果显示,土壤团聚体稳定性特征对土壤团聚体SOC、TN和TP储量的正面影响最大,连栽代次对土壤团聚体SOC、TN和TP储量的负面影响最大。
In order to explore effects of different successive rotations on soil aggregates and soil stoichiometric characteristics in eucalypt plantations,taking the first to third successive rotations of eucalypt plantations in Guangxi as research objects,distributions,stabilities,contents and stocks of organic carbon(SOC),total nitrogen(TN),total phosphorus(TP)in soil aggregates and their stoichiometric characteristics in 0-20 and 20-40 cm soil layers were investigated.Results showed that in eucalypt plantations with different successive rotations,mass percentages of soil aggregates with>2 mm particle size were the highest;contents of SOC,TN and TP were higher in soil aggregates with 0.25-1 and<0.25 mm particle sizes;stocks of SOC,TN and TP were the highest in soil aggregates with>2 mm particle size.In 0-20 and 20-40 cm soil layers,with increase of successive rotations,mass percentages of soil aggregates with>2 and>1-2 mm particle sizes decreased;mass percentages of soil aggregates with 0.25-1 and<0.25 mm particle sizes increased;MWD and GMD of soil aggregates decreased,and D increased;contents of SOC,TN and TP in whole soils and soil aggregates with different particle sizes decreased;stocks of SOC,TN and TP in whole soils decreased;most of stocks of SOC,TN and TP in soil aggregates with>2,>1-2 and 0.25-1 mm particle sizes showed decreasing trends,while stocks of SOC,TN and TP in soil aggregates with<0.25 mm particle size showed increasing trend.In eucalypt plantations,soil C decomposition and mineralisation rates were faster,soil P effectiveness was higher,and soils were N-limited.Results of RDA and PLS-SEM showed that soil aggregate stability characteristics had the greatest positive effects on stocks of SOC,TN and TP in soil aggregates,and successive rotations had the greatest negative effects on stocks of SOC,TN and TP in soil aggregates.
作者
崔宇鸿
岑祚舟
燕羽
李梓华
吴昊
李林欣
侯懿洋
卢志锋
Cui Yuhong;Cen Zuozhou;Yan Yu;Li Zihua;Wu Hao;Li Linxin;Hou Yiyang;Lu Zhifeng(College of Forestry,Guangxi University,Nanning,Guangxi 530004,China;Guangxi State-owned Yachang Forest Farm,Baise,Guangxi 533000,China)
出处
《广西林业科学》
2024年第4期453-462,共10页
Guangxi Forestry Science
基金
广西自筹经费林业科技项目:桉树施肥抚育措施关键技术研究(2023GXZCLK09)
中央财政林业科技推广项目(2022 TG26号)。
关键词
土壤团聚体
连栽
碳、氮和磷化学计量
桉树
soil aggregate
successive rotation
stoichiometry of C,N and P
eucalypt
