冀北山地不同树种根际土壤化学性质特征

Rhizosphere Soil Chemical Properties of Different Tree Species in Mountain Areas of Northern Hebei

为了了解冀北山地不同树种根际土壤养分的差异,对该地区6个树种[华北落叶松(Larix principis-rupprechtii)、白桦(Betula platyphylla)、胡桃楸(Juglans Mandshurica)、白榆(Ulmus pumila)、花楸(Sorbus pohuashanensis)、樟子松(Pinus sylvestris)]根际土壤的化学性质进行分析。结果表明:1)6个树种根际土壤全量养分中,土壤总有机碳的含量范围为33.90~107.65 mg/g,土壤总氮的含量范围为2.40~8.65 mg/g,土壤总磷的含量范围为490.52~829.60 mg/kg,其中全磷含量最高的为胡桃楸,全氮和全碳含量最高的均为白桦。2)土壤氨态氮含量最高的为樟子松,显著高于其它树种;土壤有效磷含量最高的为胡桃楸;土壤硝态氮、速效氮和速效钾含量最高的为白榆。3)根际土壤C/N,C/P,N/P的范围分别为11.64~12.62,69.34~128.10,4.89~10.29;C/N比值最高的为樟子松,C/P和N/P比值最高的均为白桦。4)相关性分析表明,土壤pH、土壤含水率与土壤各养分之间存在着显著或极显著的正相关关系;各速效养分与全量养分之间也存在着显著或极显著的正相关关系。

In order to understand the differences of rhizosphere soil nutrients among different tree species in mountain areas of northern Hebei,the chemical properties of rhizosphere soil of six tree species(Larix principisrupprechtii,Betula platyphylla,Juglans mandshurica,Ulmus pumila,Sorbus pohuashanensis and Pinus sylvestris)in the region were analyzed.The results showed that:1)among the total nutrients in rhizosphere soil of the six tree species,the content of total organic carbon in soil ranged from 33.90 to 107.65 mg/g,the content of total nitrogen in soil ranged from 2.40 to 8.65 mg/g,and the content of total phosphorus in soil ranged from 627.35 to 829.60mg/kg.Among them,Juglans mandshurica had the highest content of total phosphorus,and Betula platyphylla had the highest content of total nitrogen and total carbon.2)The highest content of ammonia nitrogen in soil was Pinus sylvestris,which was significantly higher than that of other tree species;Juglans mandshurica had the highest content of available phosphorus in soil;Ulmus pumila had the highest content of nitrate nitrogen,available nitrogen,and available potassium in soil.3)The range of C/N,C/P and N/P in rhizosphere soil were 11.64~12.62,69.34~128.10 and 4.89~10.29,respectively.Pinus sylvestris had the highest C/N ratio,and Betula platyphylla had the highest C/Pand N/P ratios.4)The correlation analysis showed that there was a significant or extremely significant positive correlation between soil pH,soil moisture content and soil nutrients;there was also a significant or extremely significant positive correlation between available nutrients and total nutrients.