三峡库区消落带2种树木林下土壤的物理性质比较

发布时间：2018-04-29 04:34

本文选题：三峡库区 + 消落带　；参考：《西北农林科技大学学报(自然科学版)》2017年04期

【摘要】：【目的】研究不同树种对三峡库区消落带土壤物理性质的影响,为三峡库区消落带植被恢复与重建提供科学依据。【方法】以重庆市主城区消落带植被恢复治理示范区石门段2个树种(南川柳纯林和枫杨纯林)林下土壤为研究对象,以相邻荒地土壤为对照,对3月(消落带出露期)至7月(消落带旱季)的土壤体积质量、土壤孔隙度、土壤持水量等物理性质进行比较。【结果】3月,枫杨林下土壤物理性质与荒地土壤差异不大,3个土层平均土壤总孔隙度(23.05%)、田间持水量(69.51g/kg)甚至略逊于荒地土壤(27.88%和86.24g/kg);7月,枫杨林下土壤物理性质明显优于荒地土壤。3月,南川柳林下土壤物理性质优于枫杨林下土壤;7月,枫杨林下土壤物理性质明显优于南川柳林下土壤。与3月相比,7月南川柳土壤物理性质指标均出现小幅下降,但变化不显著;枫杨林下土壤由于毛管孔隙显著增加(3个土层毛管孔隙度平均值由18.86%增加至41.20%),土壤物理性质指标均显著提高;荒地土壤物理性质未出现显著变化。【结论】2种三峡库区消落带适生树种的林下土壤物理性质存在明显差异,但均能对消落带土壤物理性质起到保护和改善作用。
[Abstract]:[objective] to study the effects of different tree species on the physical properties of soil in the three Gorges Reservoir area. To provide the scientific basis for vegetation restoration and reconstruction in the three Gorges Reservoir area. [methods] the soil under the forest of two tree species (Liuchun forest and pure Fengyang forest) in the demonstration area of vegetation restoration and treatment in the main urban area of Chongqing was studied. The physical properties of soil volume mass, soil porosity and soil water holding capacity from March to July (dry season) were compared with those of adjacent wasteland soils. [results] in March, the soil volume mass, soil porosity and soil water holding capacity were compared between March and July (dry season). [results] in March, the soil volume mass, soil porosity and soil water holding capacity were compared. There was no significant difference between the physical properties of the soil under the forest and the wasteland soil. The average total porosity of the three soil layers was 23.05%, and the field water holding capacity of 69.51 g / kg) was slightly lower than that of the wasteland soil (27.88% and 86.24 g / kg 路kg ~ (-1). In July, the physical properties of the soil under the forest were obviously better than those of the wasteland soil. The physical properties of the soil under the willow forest in Nanchuan were better than those under the forest of Maple poplar, and in July, the physical properties of the soil under the forest were obviously better than those under the willow forest in Nanchuan. Compared with March, the soil physical properties of Nanchuan willow decreased slightly in July, but the change was not significant. Because of the increase of capillary porosity (the average value of capillary porosity in three soil layers increased from 18.86% to 41.20%), the soil physical properties were significantly increased. There was no significant change in soil physical properties in wasteland. [conclusion] there were significant differences in soil physical properties between the two species, but both of them could protect and improve the soil physical properties.
【作者单位】：西南大学资源环境学院林学系;
【基金】：国家自然科学基金项目(31370602)
【分类号】：S714.2

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