应用生态学报2017，Vol.28Issue(5)：1619-1625,7.DOI:10.13287/j.1001-9332.201705.020
不同年限旱砂田土壤团聚体及其有机碳分布特征
Distribution characteristics of soil aggregates and their associated organic carbon in gravel-mulched land with different cultivation years
摘要
Abstract
The distribution characteristics of soil aggregates and their organic carbon in gravel-mulched land with different planting years (5,10,15,20 and 30 years) were studied based on a long-term field trial.The results showed that the soil aggregate fraction showed a fluctuation (down-up-down) trend with the decrease of soil aggregate size.The soil aggregates were distributed mainly in the size of ＞5 mm for less than 10 years cultivation,and 0.05-0.25 mm for more than 15 years.The content of aggregates over 0.25 mm (R0.25) and the mean weight diameter (MWD) of soil aggregates all decreased with the increase of cultivation time.The content of organic carbon within soil aggregates increased with the decrease of soil aggregate size in gravel-mulched land with different planting years.However,the content of organic carbon within soil aggregates,contribution rates of different aggregate fractions to soil organic carbon and soil organic carbon storage of aggregate fractions decreased with planting time extension and soil depth.Soil organic carbon in the aggregate sizes over 1 mm was sensitive to long term gravel-mulched field planting.Organic carbon storage of aggregate fractions with 10,15,20 and 30 years of planting decreased by 8.0％,24.4％,27.5％ and 31.4％ in the soil depth of 0-10 cm,and 1.4％,15.8％,19.4％ and 21.8％ in the soil depth of 10-20 cm,respectively.In conclusion,the ability of soil carbon sequestration in arid gravel-mulched field was reduced with planting time extension.Therefore,soil fertility of gravel-mulched fields which were cultivated for more than 15 years need to be improved.关键词
旱砂田/土壤团聚体/有机碳/有机碳储量Key words
gravel-mulched field/soil aggregate/soil organic carbon/soil organic carbon stock引用本文复制引用
杜少平,马忠明,薛亮..不同年限旱砂田土壤团聚体及其有机碳分布特征[J].应用生态学报,2017,28(5):1619-1625,7.基金项目
本文由甘肃省农业科学院中青年基金项目(2014GAAS26)、国家西甜瓜产业技术体系(CARS-26-20)和农业部西北地区蔬菜科学观测实验站项目(2015-A2621-620321-G1203-066)资助 This work was supported by the Foundation for Young in Gansu Academy of Agricultural Sciences (2014GAAS26),the China Agriculture Research System for Watermelon and Melon (CARS-26-20),and the Ministry of Agriculture Scientific Observations Experiment Station of Vegetables in the Northwest of China (2015-A2621-620321-G1203-066). （2014GAAS26）
