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榆林市樟子松人工林土壤养分特征

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为进一步探明陕西省榆林市樟子松人工林的土壤养分变化特征，以5年生樟子松(Pinus sylvestris L。var。mongolica Litv。)纯林和5年生樟子松-胡枝子(Lespedeza bicolor Turcz。)混交林为研究对象，分析土壤有机质、硝态氮、有效磷、速效钾等理化指标以及土壤酶活性的变化特征。结果表明，樟子松纯林和樟子松-胡枝子混交林土壤有机质、有效磷和速效钾含量整体上均随着土层深度的增加呈下降趋势，全磷含量均随着土层深度的增加呈先升高后降低的趋势，硝态氮含量则均随着土壤深度的增加而增加，5个指标均表现为樟子松-胡枝子混交林高于樟子松纯林，且樟子松-胡枝子混交林各层土壤有效磷含量均显著高于樟子松纯林(P<0。05);樟子松纯林和樟子松-胡枝子混交林土壤含水率各土层间差异均不显著，樟子松-胡枝子混交林5～15 cm土层土壤含水率含量显著高于樟子松纯林(P<0。05);樟子松纯林和樟子松-胡枝子混交林土壤碱性磷酸酶活性、过氧化氢酶活性、脲酶活性均随着土层深度的增加而降低，且樟子松-胡枝子混交林过氧化氢酶活性和脲酶活性在各土层均显著高于樟子松纯林(P<0。05)。
Soil nutrients characteristics of Pinus sylvestris L.var.mongolica Litv.plantation in Yulin City
In order to investigate the characteristics of soil nutrient changes of Pinus sylvestris L.var.mongolica Litv.plantation in Yulin City,Shaanxi Province,a 5-year-old pure plantation and a 5-year-old mixed plantation of P.sylvestris L.var.mongolica Litv.were selected as the research objects,and the changes of soil organic matter,nitrate nitrogen,available phosphorus,available potassi-um,and soil enzyme activity were analyzed.The results showed that the contents of soil organic matter,available phosphorus and available potassium in pure forest of P.sylvestris var.mongolica Litv.(abbreviated as pure forest)and mixed forest of P.sylvestris L.var.mongolica Litv.and Lespedeza bicolor Turcz.(abbreviated as mixed forest)decreased with the increase of soil depth,the content of total phosphorus increased first and then decreased with the increase of soil depth,and the content of nitrate nitrogen increased with the increase of soil depth.The five indexes showed that the mixed forest was higher than that of pure forest,and the content of available phosphorus in each layer of mixed forest was significantly higher than that of pure forest(P<0.05).The soil moisture content between different soil layers was no significant in pure forest and mixed forest,and the soil moisture content of 5～15 cm soil layer in mixed for-est was significantly higher than that in pure forest(P<0.05).The soil alkaline phosphatase activity,catalase activity and urease activ-ity of pure forest and mixed forest decreased with the increase of soil depth,and the catalase activity and urease activity of mixed forest were significantly higher than those of pure forest in each soil layer(P<0.05).

Pinus sylvestris L.var.mongolica Litv.pure forestmixed forestsoil physical and chemical indexenzyme activityYulin City

白晓霞、崔洁、周千强、齐凯乐

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榆林学院生命科学学院,陕西 榆林 719000

樟子松(Pinus sylvestris L.var.mongolica Litv.) 纯林 混交林 土壤理化指标 酶活性 榆林市

陕西省科技厅一般项目陕西省科技厅计划项目榆林市科技局产学研合作项目

2021JQ-8312019JQ-904CXY-2022-90

2024

10.14088/j.cnki.issn0439-8114.2024.01.008

湖北农业科学
湖北省农业科学院　华中农业大学　长江大学　黄冈师范学院

湖北农业科学

CSTPCD
影响因子：0.442
ISSN：0439-8114
年,卷(期)：2024.63(1)
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