冀北坝上地区不同退耕还林模式对土壤理化性质的影响

旨在探讨不同退耕还林模式下土壤理化性质的演变规律。选取冀北坝上地区退耕还林地为研究对象,以退耕封育草地为对照,对比分析3种不同退耕还林样地（沙棘林、柠条林、榆树林）的土壤理化性质。结果表明：不同退耕还林模式下土壤理化性质变化明显。土壤容重平均值排序：沙棘林(1.17 g/cm ³)<榆树林(1.24 g/cm ³)<柠条林(1.26 g/cm ³)<封育草地(1.61 g/cm ³);土壤总孔隙度平均值排序：沙棘林(55.29%)>榆树林(52.55%)>柠条林(51.93%)>封育草地(38.85%);有机质含量平均值排序：沙棘林(3.191%)>柠条林(3.128%)>榆树林(2.804%)>封育草地(2.536%)。退耕还林实施后植被对土壤理化性质产生积极作用,不同退耕还林模式对土壤理化性质的影响存在差异,沙棘林对土壤理化性质的改良效果最佳。

Different Modes of Returning Farmland to Forest in Bashang Area of Northern Hebei: Effects on Soil Physicochemical Properties

To explore the evolution law of soil physicochemical properties under different modes of returning farmland to forest, we compared and analyzed the soil physicochemical properties under 3 different modes of returning farmland to forest (Hippophae rhamnoides Linn., Caragana korshinskii., Ulmus pumila L.) by taking the returning farmland to forest area in Bashang area of northern Hebei as the study object and the enclosed grassland as the control. The results showed that: the changes of soil physicochemical properties under different modes of returning farmland to forest were obvious; the average ranking of the soil bulk density was: Hippophae rhamnoides Linn. (1.17 g/cm ³)<Ulmus pumila L. (1.24 g/cm ³)<Caragana korshinskii. (1.26 g/cm ³)3); the average ranking of total porosity of soil was: Hippophae rhamnoides Linn.(55.29%)>Ulmus pumila L. (52.55%)>Caragana korshinskii. (51.93%)>enclosed grassland (38.85%); the average ranking of organic matter was: Hippophae rhamnoides Linn. (3.191%)>Caragana korshinskii .(3.128%)>Ulmus pumila L. (2.804%)>enclosed grassland (2.536%). After the implementation of returning farmland to forest, vegetation has a positive effect on soil physicochemical properties, different modes of returning to forest have different effects on soil physicochemical properties, and the effect of Hippophae rhamnoides Linn on physicochemical properties is the best.