苏北石灰岩山地不同造林模式对土壤理化性质的影响

[目的]研究不同造林模式对石灰岩山地土壤理化性质的影响.[方法]以徐州市铜山县吕梁林场小黑山为研究区,选取侧柏黄栌栾树混交林（CHL）、侧柏青桐混交林（CQ）、侧柏枫香混交林（CF）、侧柏纯林（C）、侧柏女贞混交林（CN）5种造林模式及对照荒坡为研究对象,对不同造林模式及对照荒坡对土壤理化性质的影响进行了研究.[结果]①5种造林模式都显著改良了土壤的理化性质,其中侧柏枫香混交林对土壤改良效果最为明显.②对土壤物理性质的改良效果：侧柏黄栌栾树混交林比其他4种造林模式效果差,其他4种模式改良效果差异不明显.③对土壤化学性质的改良效果：侧柏枫香混交林对土壤有机质、水解氮、有效磷、速效钾、全磷的改良效果较好;侧柏纯林对土壤全氮的改良效果较好;改良全钾的效果以侧柏黄栌栾树混交林最好.[结论]侧柏枫香混交林比其他4种造林模式更适宜在研究区种植.

Study on Soil Physical and Chemical Characteristics under Different Afforestation Models in Limestone Mountain in the North of Jiangsu Province

[ Objective ] The effects of different afforestation models in hmestone mountain on soil physical and chemical characteristics were stud- ied. [ Method ] In this paper, five ＇afforestation models i. e. Platycladus orientalis （ L. ） Franco, Cotinus coggygria Scop and Koelreuteria paniculata mixed forest, Platycladus orientalis （L.） Franco and Firmiana simplex mixed forest, Platycladus orientalis （ L. ） Franco forest, Platycladus orientalis （L.） Franco and Ligustrum compactum mixed forest and the control slope were selected as objects of studies in Lvliang forest farm of Tongshan district, Xuzhou city, studying different afforestation model and control slope how to influence on soil physical and chemical characteristics. [ Result] Five afforestation models are significantly improved the physical and chemical characteristics of soil, Platycladus orientalis （L.） Franco and Deutzia scabra Thunb mixed forest showed the best improvement effects. For improving soil physical characteriistics, Platycladus orientalis （L.） Franco, Cotinus coggygria Scop and Koelreuteria paniculata mixed forest showed the lower improvement effects than other four afforestation models which were not obvious among them. For improving soil chemical characteristics, Platycladus orientalis （ L. ） Franco and Deutzia scabra Thunb mixed forest showed better improvement effects than other afforestation models for soil organic matter, hydrolyzable nitrogen, rapid a- vailable phosphorus, rapid available potassium, total phosphorus. Platycladus orientalis （L.） Franco forest showed the best improvement effects of total nitrogen and Platycladus orientalis （L.） Franco,Cotinus coggygria Scop and Koelreuteria paniculata mixed forest showed the best improve- ment effects of total potassium. [ Conclusion]Platycladus orientalis （L.） Franco and Deutzia scabra Thunb mixed forest was more suitable planted in the study area than the other four kinds of afforestation models.