干旱地区农业研究2017，Vol.35Issue(1)：277-282,288,7.DOI:10.7606/j.issn.1000-7601.2017.01.41
无定河流域植被恢复对土壤团聚体及碳固定的影响
Effects of vegetation restoration on soil aggregates and carbon sequestration in Wuding River catchment
摘要
Abstract
Content of soil water stable aggregates with different diameter,soil organic matter,and available phos-phorus in whole soil samples and in aggregations of different diameter were measured in order to evaluate the effect of veg-etation restoration on soil structure,nutrients and soil carbon sequestration .Soil samples were collected from slope crop-land and vegetation restoration areas experiencing cropland abandonment 4,5,10,30,50 years in Wuding river catch-ment .The results showed that the content of soil organic matter and available phosphorus,was 6 .73~3 1 .83 g·kg-1 and 1.93~14.72 mg·kg-1 in whole soil samples,and 7.15~26.03 g·kg-1 and 3.71~16.64 mg·kg-1 in aggregations with different diameters .Top-soil organic matter and soil organic carbon density were increased significantly by vegetation restoration compared with cropping land,whose increases were most obvious at Pyrus betulaefolia community and in-creased by 24 .93 g·kg-1 and 9 1 .98 mg·cm-2 .Soil water stable aggregates were mainly <0 .05 mm and 0 .05~0 .1 mm,with the ratios being 37 .06%~57 .22%and 21 .71%~29 .76%respectively.The aggregate-associated organic matter content was the highest in 0 .2~0 .5 mm,which increased with decrease of diameter from >2 mm to 0 .2~0 .5 mm but decreased with decrease of diameter from 0 .2~0 .5 mm to <0 .05 mm .The aggregate-associated available phosphorus content decreased with decrease of diameter from >2 mm to <0 .05 mm except 1~2 mm whose value was the highest .Linear positive correlation was observed between soil organic density and vegetation restoration years .It takes more years for the ability of soil water erosion resistance to be improved significantly compared to the improvement of soil carbon sequestration .The aggregate-associated organic matter content was the higher under fast wetting than slow wetting . Heavy rain or rainstorm may be the primary cause destroying soil structure and decomposing soil organic carbon at the area .关键词
植被恢复/土壤有机碳密度/水稳性团聚体/无定河流域Key words
vegetation restoration/soil organic carbon density/water stable aggregates/Le Bissonnais method/Wuding river catchment分类
农业科技引用本文复制引用
董莉丽,李晓华,杨波..无定河流域植被恢复对土壤团聚体及碳固定的影响[J].干旱地区农业研究,2017,35(1):277-282,288,7.基金项目
陕西省教育厅重点科研项目（16JZ089）；陕西省普通高等学校优势学科建设项目 （）
