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白洋淀上游典型林分类型土壤理化性质及其化学计量特征

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[目的]白洋淀上游规模化林场是改善京津冀地区生态环境、保障雄安新区及周边生态安全的绿色屏障。研究该区不同林分类型土壤理化性质,了解不同林分土壤肥力情况,以期为后续人工林的经营和管理提供科学参考。[方法]选取 4种典型林分:刺槐、油松、蒙古栎和栓皮栎为研究对象,测定其 0~20 cm和 20~40 cm土层土壤理化性质,计算碳(C)、氮(N)、磷(P)化学计量比,并进行差异性检验和相关性分析。[结果]蒙古栎林的土壤容重最小,孔隙度最大,持水量最高,其他林分类型之间土壤物理性质差异不显著。刺槐林土壤有机质、全磷、速效磷含量较高,全钾、速效钾含量偏低;油松林土壤pH值较低,土壤酸化较为严重,有机质、全氮、碱解氮含量偏低;蒙古栎林土壤拥有较高的全氮、碱解氮含量;栓皮栎林土壤表现为较低的磷含量和较高的钾含量。根据土壤C、N、P化学计量特征,本研究区 4种林分类型在 0~40 cm土层C∶N、C∶P、N∶P的变化范围为 18。87~40。54、25。10~95。32、0。95~6。06,油松林土壤C∶N最高,C∶P、N∶P最低,栓皮栎林C∶N最低,N∶P最高;蒙古栎林C∶P最高。[结论]研究区土壤有机质矿化速率较低,植物生长受氮限制,油松林氮受限最严重,栓皮栎林土壤有机质更易矿化分解,氮限制程度较弱。
Soil Physicochemical Properties and Stoichiometric Characteristics of Typical Stand Types in the Upstream of Baiyangdian Lake
[Objective]The large-scale forest farm in the upper reaches of Baiyangdian Lake is a green barrier to improve the ecological environment of the Beijing-Tianjin-Hebei region and ensure the ecological security of Xiongan New Area and its surrounding areas.The soil physical and chemical properties of different stand types were studied to understand the soil fertility of different stands in order to provide scientific reference for the management of subsequent plantation.[Method]Four typical stands,namely Robinia pseudoacacia,Pinus tabulaeformis,Quercus mongolica and Quercus variabilis,were selected as the research objects.The soil physicochemical properties of 0~20 cm and 20~40 cm soil layers were determined,and the stoichiometric ratios of carbon(C),nitrogen(N)and phosphorus(P)were calculated,and the differences and correlations were analyzed.[Result]The soil bulk density,porosity and water holding capacity of Q.mongolica forest were the smallest,and the difference of soil physical properties among other stand types was not significant.The contents of organic matter,total P and available P of R.pseudoacacia forest were higher,while the contents of total potassium(K)and available K were lower.The soil pH value of P.tabulaeformis forest was low,the soil acidification was serious,and the contents of organic matter,total N and alkali-hydrolyzed N were low.The soil contents of total N and alkali-hydrolyzed N were higher in Q.mongolica forest,and the Q.variabilis forest showed lower P content and higher K content.According to the stoichiometric characteristics of soil C,N and P,C∶N,C∶P and N∶P of the four stand types in this study area ranged from 18.87 to 40.54,25.10 to 95.32,and 0.95 to 6.06 in the 0~40 cm soil layer.The soil C∶N of P.tabulaeformis forest was the highest,while C∶P and N∶P were the lowest.The C∶N of Q.variabilis forest was the lowest,and N∶P was the highest;Q.mongolica forest with the highest C∶P.[Conclusion]In this study area,soil organic matter mineralization rate was low,and plant growth was limited by N.The N limitation of P.tabulaeformis forest is the most serious,and the soil organic matter of Q.variabilis forest is more easily mineralized and decomposed,and the degree of N limitation is weak.

Stand typeSoil physicochemical propertiesStoichiometric Characteristics

史丽娟、吕海涛、张树梓、李联地、任启文、冯广

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河北省林业和草原科学研究院,河北 石家庄 050061

河北小五台山森林生态系统国家定位观测研究站,河北 涿鹿 075600

河北省林业和草原工程项目中心,河北 石家庄 050081

河北省森林城市建设技术创新中心,河北 石家庄 050061

海南大学热带农林学院,海南 海口 570228

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林分类型 土壤理化性质 化学计量特征

河北省重点研发计划河北省重点研发计划河北省林草关键技术创新与示范项目中央财政林草科技推广示范资金项目海南省自然科学基金

22327601D20327601D2306090冀TG[2023]015421QN198

2024

土壤通报
中国土壤学会

土壤通报

CSTPCD北大核心
影响因子:0.818
ISSN:0564-3945
年,卷(期):2024.55(4)