GOU Tianxiong,LIU Han,SHUAI Wei,et al.Characteristics of Soil Aggregate at Different Altitude Gradients in High-Frigid Mountain of West Sichuan Region[J].Research of Soil and Water Conservation,2020,27(01):47-53.
川西高寒山地不同海拔高度土壤团聚体特征
- Title:
- Characteristics of Soil Aggregate at Different Altitude Gradients in High-Frigid Mountain of West Sichuan Region
- 文章编号:
- 1005-3409(2020)01-0047-07
- 分类号:
- S812.2
- 文献标志码:
- A
- 摘要:
- 为探究川西北高寒山地不同海拔高度土壤团聚体分布特征及其稳定性,通过野外调查采样和室内试验分析的方式,对四川西部折多山高寒山地6个海拔梯度土壤团聚体特征进行了研究。结果表明:0—20 cm土层不同海拔>0.25 mm粒径的土壤中非水稳性团聚体含量占80%以上,水稳定性团聚体含量占70%以上; 0—60 cm土层>0.25 mm粒径的土壤非水稳定性团聚体总体上呈现随海拔上升而增加的趋势,而水稳定性团聚体则呈现出随海拔升高先逐渐减小后增大的趋势。不同海拔土壤团聚体中有机质主要分布在>0.25 mm粒级中,且呈现随海拔升高先增加而后降低的趋势,随土层深度加深而逐渐降低的趋势。平均质量直径(MWD)、几何平均直径(GMD)均呈现出随海拔降低而逐渐减小的趋势,分形维数(D)则呈现增大的趋势,>20 cm土层规律不明显。表明川西高寒山地表层土壤团粒结构稳定性较好,防止土壤退化应是该区生态保护的重点。
- Abstract:
- In order to research the effect of altitude on the characteristics of soil aggregate and its stability in High-Frigid Mountainous region, based on field investigation and experimental measurement, we determined soil aggregate along altitude gradient. The results showed that the content of >0.25 mm air-dried aggregate was greater than 80%, the content of water stability aggregate was greater than 70%; the content of >0.25 mm air-dried aggregate in 0—60 cm soil layer increased with increase of altitude, and the content of soil water stability aggregate decreased at first and then increased with increase of latitude; the organic matter content of >0.25 mm aggregate was highest, it increased at first and then decreased with increase of latitude, and decreased with increase of soil depth; mean weight diameter and geometric mean diameter decreased with decrease of altitude, while fractal dimensionality in 0—20 cm soil layer showed the increasing trend, but the pattern wasn’t obvious in >20 cm soil layer. These results indicated that the surface soil structure stability was better in the alpine mountain of western Sichuan, and prevention of soil degradation should be the focus of ecological protection in this area.
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备注/Memo
收稿日期:2019-03-01 修回日期:2019-04-01
资助项目:四川省科技厅项目”川西折多山高寒生态脆弱区植被恢复与重建技术研究”(2015FZ0022)
第一作者:苟天雄(1988—),男,四川剑阁人,工程师,硕士,主要从事植物学及生态恢复的研究工作。E-mail:435633002@qq.com
通信作者:刘韩(1983—),女,四川金堂人,工程师,硕士,主要从事生态恢复及林木微生物的研究工作。E-mail:helenliuhan@163.com