SUN Fenghua,CHEN Bingming,WANG Yugang

(State Key Laboratory of Desert and Oasis Ecology,Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China; Fukang Station of Desert Ecology,Chinese Academy of Sciences,Fukang 831505,China; School of Resource and Environment,University of Chinese Academy of Sciences,Beijing 100049,China)

Abstract：Gypsum as calcium-based material is widely used to ameliorate saline-sodic soils.To evaluate the impacts of calcium-based application on soil organic carbon (SOC) in desert alkaline soil,a case study was conducted with different amounts of desulfurization gypsum application (0,10,20,30 and 40 t/hm²).We estimated the distribution of SOC in the 0～100 cm profile,the variation trend and influencing factors of SOC in the 0～20 cm soil layer of desert alkaline soil in a period of 46 d experiments.The results showed that desulfurization gypsum application ameliorated the desert soil,and soil pH values decreased significantly in all treatment experiments.The pH was 8.24 (initial 9.97) in the treatment with the amount of 30 t/hm² desulfu-rization gypsum,and the electrical conductivity is 0.98 mS/cm.The SOC content with the desulfurization gypsum application changed at 0-40 cm soil depth ,but it had no significant change at the soil depth of 40-100 cm (P>0.05).The SOC content was in stable state (namely no change) 15 d after in desulfurization gypsum application.The SOC content and density at the soil depth of 0-20 cm decreased in the treatment with 40 t/hm² desulfurization gypsum.Precipitation and relative humidity accelerated the decrease in SOC content at 0-20 cm depth,with the effect size of precipitation>relative humidity.but total solar radiation and temperature slowed the decrease in SOC content at 0-20 cm depth,with the effect size of total solar radiation>temperature.Overall,our findings suggest that the addition of desulfurization gypsum<40 t/hm² ameliorated saline-sodic soils but did not reduce SOC content.

Keywords：composite cement soils amelioration;soil organic carbon;desulphurized gypsum;saline-alkali soil

Get Citation: SUN F H ,CHEN B M,WANG Y G.Effects of applying desulfurized gypsum on soil organic carbon distribution in profile of desert alkaline soil[J].China Powder Science and Technology,2023,29(3)：1-11.

Received： 2022-11-24,Revised：2023-02-08,Online：2023-04-28 14：49。

Funding Project：国家自然科学基金项目,编号：U1803342。

First Author：孙丰华(1997—),男,硕士研究生,研究方向为生态修复。E-mail：sunfenghua20@mails.ucas.ac.cn。

Corresponding Author：王玉刚(1976—),男,研究员,博士,博士生导师,研究方向为干旱区景观与物质循环。E-mail：wangyg@ms.xjb.ac.cn。