植物营养与肥料学报2012，Vol.18Issue(4)：876-883,8.
黄土高原植被恢复提高大于0.25mm粒级水稳性团聚体在土壤增碳中的作用
The role of increasing soil water-stable aggregates with diameter 〉 0.25 mm by vegetation restoration in enhancement of soil organic carbon in the Loess Plateau
摘要
Abstract
In this study,we investigated the changes in soil water stable aggregates of 0-5 cm surface and their organic carbon contents induced by different restoration vegetation types（grass,shrub and tree） at 3 sites including Suide,Wuqi,Yichuan in Shaanxi province on the Chinese Loess Plateau.Water stable aggregates with diameters of 〉 2 mm and 2-0.25 mm and their organic carbon contents（SOC） were significantly increased by all vegetation types and these increases were different among three investigated sites.Compared with farmland,restoration of Pinus tabulaeformis and Caragana in Suide site resulted in an increase of SOC in water stable aggregates of 〉2 mm and 2-0.25 mm by 99%-153% and 219%-350%,respectively.At Wuqi site,alfalfa and Hippophae respectively increased SOC in water stable aggregates of 〉2 mm and 2-0.25 mm by 28%-30% and 85%-130%,whereas Locust tree did not increase SOC in water stable aggregates of 〉2 mm but increased SOC by 210% of 2-0.25 mm diameter.At Yichuan site,Pennisetum flaccidum,Bothriochloa ischemum（L.） Keng,Sophora viciifolia and Pinus tabulaeformis respectively increased SOC in water stable aggregates of 〉2 mm and 2-0.25 mm by 405%–932% and 724%–1130%.The enhancement of SOC by restoration of vegetation on cultivated slopes is mainly the increase of SOC in soil water-stable aggregates of two diameters 〉2 mm（514%） and 2-0.25 mm（470%）,but not for other diameters.The increased values of SOC of 〉2 mm and 2 – 0.25 mm respectively contributed to 49% and 43% of total SOC increased by vegetation restoration while less than 16% SOC increase in other diameters of water-stable aggregates.These results suggest that the formation of water-stable aggregates of 〉 0.25 mm diameter through stabilization of soil structure by vegetation may play an important role in soil carbon sequestration in the eroding landscapes of the Chinese Loess Plateau.关键词
植被恢复/水稳性团聚体/团聚体中有机碳含量/土壤碳储量Key words
vegetation restoration/water stable aggregates/organic carbon content in soil aggregates/soil carbon storage分类
农业科技引用本文复制引用
于寒青,李勇,金发会,孙丽芳..黄土高原植被恢复提高大于0.25mm粒级水稳性团聚体在土壤增碳中的作用[J].植物营养与肥料学报,2012,18(4):876-883,8.基金项目
国家自然科学基金项目 （）
国际原子能机构项目（IAEArese~chcontractNo.15479,15938）资助. （）
