Wan Xin,Zhang Shuaiwen,Zhang Runqin,et al.Soil Aggregate Stability of Different Land Use Patterns on the Qinghai-Tibetan Plateau[J].Research of Soil and Water Conservation,2024,31(01):53-60.[doi:10.13869/j.cnki.rswc.2024.01.047]
青藏高原不同土地利用方式土壤团聚体组成及稳定性特征
- Title:
- Soil Aggregate Stability of Different Land Use Patterns on the Qinghai-Tibetan Plateau
- 文章编号:
- 1005-3409(2024)01-0053-08
- 分类号:
- S152.4
- 文献标志码:
- A
- 摘要:
- [目的]探究青藏高原不同土地利用方式对土壤团聚体分布特征及稳定性的影响,为改善高寒地区土壤质量提供科学依据。[方法]选取青藏高原5种不同土地利用方式(农田、人工林、湿地、灌丛、裸地)为研究对象,采用干筛法和湿筛法测定土壤团聚体粒径分布以及土壤有机碳(SOC)、总碳(TC)、总氮(TN)、pH,并计算大团聚体重量的百分含量(DR>0.25,WR>0.25)、团聚体破坏率(PAD)、平均重量直径(MWD)、几何平均直径(GMD)等土壤团聚体稳定性指标,研究了高寒地区不同土地利用方式下团聚体组成及其稳定性特征。[结果]相较于机械稳定性团聚体,土壤水稳定性团聚体更易受到土地利用方式的影响,且更能反映西藏地区土壤团聚体结构稳定性; 农田耕种增加了具有机械稳定性的土壤大团聚体含量,但不具有水稳定性; 人工林和湿地的土壤团聚体具有较高的水稳定性特征。相关性分析表明,土壤团聚体MWD与SOC,TN含量呈显著正相关; 土壤团聚体MWD,GMD值与各粒径团聚体含量总体上呈线性相关,且对于机械稳定性团聚体,1 mm是正负相关的临界点,对于水稳定性团聚体,0.25 mm是正负相关的临界点。[结论]高寒地区农业耕种仅能提高土壤团聚体的机械稳定性,湿地和人工林对团聚体稳定性具有促进作用,建议未来在高寒地区进行合理的植被覆盖进而提高土壤质量。
- Abstract:
- [Objective] The aims of this study are to investigate the effects of different land use patterns on the distribution characteristics and stability of soil aggregate on the Qinghai-Tibet Plateau, and to provide a scientific basis for improving soil quality in alpine regions. [Methods] Five different land use patterns(farmland, plantation,wetland, shrubland, and bareland)were selected as the study samples on the Tibetan Plateau. Soil aggregate size distribution and soil organic carbon(SOC), total carbon(TC), total nitrogen(TN), and pH were determined by dry and wet sieving methods. >0.25 mm soil aggregates weight percentage(DR>0.25, WR>0.25), the percentage of aggregate destruction(PAD), the mean weight diameter(MWD), and the geometric mean diameter(GMD)of soil aggregates were determined, and the composition and stability characteristics of soil aggregates under different land use patterns in the alpine region were studied. [Results] Compared with mechanically stable aggregates, soil water-stable aggregates were more susceptible to the influence of land use patterns and better reflected the structural stability of soil aggregations in Tibet. Farmland cultivation increased the content of soil macroaggregates with mechanical stability, but not with water stability. Soil aggregates in plantations and wetlands had high water stability characteristics. Correlation analysis showed that the MWD of soil aggregates was positively correlated with SOC and TN contents. For machine-stable aggregates, 1 mm is the critical size of positive and negative correlation, and for water-stable aggregates, 0.25 mm is the critical size of positive and negative correlation. [Conclusion] Agricultural cultivation in alpine areas can only improve the mechanical stability of soil aggregates, while wetlands and planted forests have a positive effect on the stability of aggregates, and it is recommended that reasonable vegetation cover should be carried out to improve soil quality in alpine areas in the future.
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备注/Memo
收稿日期:2022-10-11 修回日期:2022-11-25
资助项目:国家自然科学基金项目(31971532,32171648)
第一作者:万欣(1997—),女,安徽芜湖人,硕士研究生,主要从事土壤生态学研究。E-mail:1097778732@qq.com
通信作者:刘毅(1978—),男,湖南新化人,研究员,博士,主要从事土壤生态学研究。E-mail:liuyi@wbgcas.cn