水土保持研究2024，Vol.31Issue(1)：53-60,8.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
Soil Aggregate Stability of Different Land Use Patterns on the Qinghai-Tibetan Plateau
摘要
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(farm-land,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＞o.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.Correla-tion 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.关键词
土壤团聚体/团聚体稳定性/团聚体直径/青藏高原Key words
soil aggregate/soil aggregate stability/soil aggregate diameter/Qinghai-Tibet Plateau分类
农业科技引用本文复制引用
万欣,张帅文,张润琴,李志国,陈鹏,邢顺林,刘毅..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[J].水土保持研究,2024,31(1):53-60,8.基金项目
国家自然科学基金项目(31971532,32171648) （31971532,32171648）
