不同年限旱砂田土壤团聚体及其有机碳分布特征

doi:10.13287/j.1001-9332.201705.020

应用生态学报 ›› 2017, Vol. 28 ›› Issue (5): 1619-1625.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

杜少平¹, 马忠明^2*, 薛亮³

¹甘肃省农业科学院蔬菜研究所, 兰州 730070;
²甘肃省农业科学院, 兰州 730070;
³甘肃省农业科学院土壤肥料与节水农业研究所, 兰州 730070

收稿日期:2016-09-26 修回日期:2017-02-20 发布日期:2017-05-18
通讯作者: *E-mail: mazhming@163.com
作者简介:杜少平, 男, 1979年生, 硕士, 助理研究员. 主要从事砂田西瓜高效栽培技术研究. E-mail: dushaoping2007@163.com
基金资助:
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

Distribution characteristics of soil aggregates and their associated organic carbon in gravel-mulched land with different cultivation years

DU Shao-ping¹, MA Zhong-ming^2*, XUE Liang³

¹Institute of Vegetables, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China;
²Gansu Academy of Agricultural Sciences, Lanzhou 730070, China;
³Institute of Soil, Fertilizer and Water-saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China

Received:2016-09-26 Revised:2017-02-20 Published:2017-05-18
Contact: *E-mail: mazhming@163.com
Supported by:
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)

摘要/Abstract

摘要： 以长期定位试验5、10、15、20、30年旱砂田为研究对象,研究了不同年限旱砂田土壤团聚体及其有机碳的分布特征.结果表明:旱砂田土壤团聚体含量随粒级减小表现出“降-升-降”的变化趋势,10年以内旱砂田以>5 mm粒级团聚体为主,15年以上旱砂田以0.05～0.25 mm粒级团聚体为主,>0.25 mm团聚体含量(R_0.25)和团聚体平均质量直径(MWD)均随着覆砂年限的延长而减小.不同年限旱砂田土壤团聚体有机碳含量随团聚体粒级减小而增加,各粒级土壤团聚体有机碳含量、团聚体对有机碳的贡献率及团聚体有机碳储量均随着覆砂年限的延长和土层的加深而降低,>1 mm粒级团聚体有机碳对长期旱砂田有机碳变化响应敏感.10、15、20、30年较5 年旱砂田团聚体有机碳储量在0～10 cm土层分别降低了8.0%、24.4%、27.5%和31.4%,10～20 cm土层分别降低了1.4%、15.8%、19.4%和21.8%.综上所述,旱砂田土壤固碳能力随种植年限延长而降低,需加强15年以上旱砂田的土壤培肥工作.

关键词: 土壤团聚体, 有机碳, 有机碳储量, 旱砂田

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 (R_0.25) 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 diffe-rent 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.

Key words: gravel-mulched field, soil organic carbon, soil organic carbon stock, soil aggregate

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.

DU Shao-ping, MA Zhong-ming, XUE Liang. Distribution characteristics of soil aggregates and their associated organic carbon in gravel-mulched land with different cultivation years[J]. Chinese Journal of Applied Ecology, 2017, 28(5): 1619-1625.

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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

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