土壤学报2011，Vol.48Issue(2)：338-346,9.
土地利用方式对土壤溶解性有机碳组成的影响
EFFECT OF LAND USE ON COMPOSITION OF SOIL DISSOLVED ORGANIC CARBON
摘要
Abstract
Soil samples were collected from croplands and vegetable lands in Quzhou County of Hebei,Shouguang County of Shandong and Shunyi District of Beijing for comparison between lands under two different patterns of land use at the same location in content, distribution in the soil profile and composition of DOC.Results show that in the topsoil soil organic carbon (SOC) was 3.16％～47.4％ higher and total nitrogen (TN) 3.09％～64.1％ higher in the vegetable fields than in the crop fields, while soil C/N and pH lower.The DOC content in either crop or vegetable fields decreased significanfiy with soil depth.The mean of the DOC contents in the topsoils of the vegetable fields was 1.70 times as high as that of crop fields.A significantly positive relationship was observed between SOC and DOC.In terms of composition of the DOC, its fractions followed an order of Hydrophilic matter (HIM) ＞ Hydrophobic acids (HOA) ＞ Hydrophobic neutrals (HON) ＞ Hydrophobic bases (HOB) in the top soil (0 ～30 cm) in both crop fields and vegetable fields.In vegetable fields, HOA accounted for 19.0％～26.7％ ,while in crop fields for 14.83％～ 16.42％; The difference between the two fields in Shouguang was quite significant (p ＜0.05 ), which is probably related to the higher SOC contents and lower pH in its vegetable field.The HOM/HIM ratio was 0.30, 0.39 and 0.41 in the vegetable fields of the three regions, which may suggest that the vegetable fields vary in humification degree.In conclusion, transformation of crop fields into vegetable field significantly affects quantity and quality of DOC.关键词
溶解性有机碳/设施蔬菜/小麦-玉米轮作/土壤溶解性有机碳分组Key words
Dissolved organic carbon/ Vegetable field/ Crop field/ DOC fraction分类
农业科技引用本文复制引用
田静,郭景恒,陈海清,范明生,吕润海,魏荔,李晓林..土地利用方式对土壤溶解性有机碳组成的影响[J].土壤学报,2011,48(2):338-346,9.基金项目
国家自然科学基金项目(40701089和40773049)资助 （40701089和40773049）
