Aggregate Characteristics During Natural Revegetation on the Loess Plateau

被引:42
作者
An Shao-Shan [1 ,2 ,3 ]
Huang Yi-Mei [3 ]
Zheng Fen-Li [1 ,2 ,3 ]
Yang Jian-Guo [4 ,5 ]
机构
[1] Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Peoples R China
[2] Minist Water Resources, Yangling 712100, Peoples R China
[3] NW A&F Univ, Yangling 712100, Peoples R China
[4] China Agr Univ, Coll Water Conservancy & Civil Engn, Beijing 100083, Peoples R China
[5] Ningxia Acad Agr & Forestry Sci, Inst Agr Resources & Environm, Yinchuan 750002, Peoples R China
基金
中国国家自然科学基金;
关键词
canonical correlation analysis; loess area; natural revegetation; principal component analysis; soil water-stable aggregates;
D O I
10.1016/S1002-0160(08)60077-6
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Field investigations and laboratory analysis were conducted to study the characteristics of soil water-stable aggregates during vegetation rehabilitation in typical grassland soils of the hilly-gullied loess area. The relationship between water-stable aggregates and other soil properties was analyzed using canonical correlation analysis and principal component analysis. The results show that during the natural revegetation, the aggregates > 5 mm dominated and constituted between 50% and 80% of the total soil water-stable aggregates in most of the soil layers. The 2-5 mm aggregate class was the second main component. The mean value of water-stable aggregates > 5 mm within the 0-2 m soil profile under different plant communities decreased in the following order: Stipa grandis > Stipa bungeana Trin. > Artemisia sacrorum Ledeb. > Thymus mongolicus Ronn. > Hierochloe odorata (L.) Beauv. Clay, organic matter, and total N were the key factors that influenced the water stability of the aggregates. Total N and organic matter were the main factors that affected the water stability of the aggregates > 5 mm and 0.5-1 mm in size. The contents of Fe2O3, Al2O3, and physical clay (< 0.01 mm) were the main factors which affected the water stability of the 1-2 and 0.25-0.5 mm aggregates.
引用
收藏
页码:809 / 816
页数:8
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