黑河中游不同土地利用类型下土壤有机碳时空分布  

Temporal and spatial distribution of soil organic carbon under different land uses in the middle reaches of Heihe River

作　　者：张俊华[1,2] 李国栋[2] 南忠仁[2] 肖洪浪[3] 

机构地区：[1]安徽师范大学环境科学学院,安徽芜湖241000 [2]兰州大学资源环境学院西部环境教育部重点实验室,兰州730000 [3]中国科学院寒区旱区环境与工程研究所,兰州730000

出　　处：《兰州大学学报（自然科学版）》2009年第4期66-72,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：中国科学院知识创新重大项目(KZCX1-09);安徽省高等学校省级自然科学研究项目(KJ2008B190);安徽师范大学博士科研资助计划项目(160-750735)

摘　　要：以野外样品采集、室内分析、GIS空间模拟和遥感等多种研究方法为基础,研究黑河中游不同土地利用类型下土壤有机碳的时空分布及其变化机制.结果显示:TOC,AOC,NOC的空间分布与土地利用类型之间有明显的相关性和差异性.土壤有机碳的极值区和区内土壤有机碳质量分数的分布与土地利用类型之间有很好的对应关系;随着深度的增加,三者的空间变化趋势发生了明显变化.剖面0～100 cm深度,不同土地利用类型下TOC,AOC,NOC的质量分数和分布差异性大.分析发现:土地利用类型变化后,剖面上TOC,AOC,NOC的质量分数发生了显著变化.其中:耕作使TOC,NOC的质量分数明显升高,但由于多次的灌溉淋溶,导致AOC的质量分数降低;而土地沙漠化的过程中伴随着大量土壤有机碳的流失.Temporal and spatial distribution of soil organic carbon and its mutative mechanism were studied under different land uses in the middle reaches of Heihe River, based on the multi-methods of field samples gathered, laboratory analysis, GIS spatial analysis model and remote sensing. The results show that obvious pertinence and otherness existed between TOC, AOC, NOC and different land uses. The extreme region and regional distribution of soil organic carbon showed a better corresponding relation with different land uses; with the increase of the depth, spatial distribution of TOC, AOC and NOC had distinct change. In 0-100 cm depth of soil profile, it was found that the contents of TOC, AOC and NOC underwent a great change after land use change. Cultivation enhanced the TOC and NOC contents, but AOC content decreased for many irrigations. In the process of desertification, plenty of soil organic carbon was drained.

关 键 词：土壤有机碳 土地利用 时空分布 黑河中游 

分 类 号：K903[历史地理—人文地理学] X14[环境科学与工程—环境科学]