Soil Organic Carbon and Available Nitrogen and Phosphorus in Coastal Saline-Alkali Land Response to Nitrogen Preservation and Carbon Enhancement Treatments and Its Mechanisms
Ji Guangqing
Lin Haitao
Bi Yubo
Li Zhaoyong
Song Lingling
Liu Qing
Wang Mei
Shen Yuwen
Wang Jiangtao
Abstract：Using the indoor biochemical culture test,this rearch studied the responses of soil organic carbon and nutrients in coastal saline-alkali land to different combinations of straw returning,high-efficiency nitrogen fertilizer and straw decomposing agent,and revealed the mechanism from the perspective of soil enzy-mology,in order to provide scientific bases for selecting schemes of rapid improvement and soil fertility in-crease of coastal saline-alkali land.Five nitrogen-preserving and carbon-increasing treatments were set as no fertilization+straw returning+straw decomposing agent(T1),farmers'conventional fertilization(small granular urea)+straw returning+straw decomposing agent(T2),stabilized nitrogen fertilizer+straw retur-ning+straw decomposing agent(T3),water-based resin-coated urea+straw returning+straw decomposing agent(T4)and waterborne resin-coated urea+straw returning+modified straw decomposing agent(T5).The results showed that the nitrogen-preserving and carbon-increasing treatments could increase the contents of soil organic carbon,inorganic nitrogen and available phosphorus gradually with the extension of cultivation time;the soil organic carbon,inorganic nitrogen and available phosphorus increased by 23.12%～38.63%,13.93%～33.56%and 4.75%～25.32%respectively after 90 days of culture compared with the farmes'con-ventional fertilization treatment.The activities of urease and alkaline phosphatase increased by 47.51%～61.67%and 49.80%～65.16%respectively,and the activity of nitrate reductase decreased by 7.89%～28.67%under the nitrogen-preserving and carbon-increasing treatments.T5 treatment had significant soil im-provement effect for the most obvious increase of soil organic carbon and effective nutrients,so it would be the best scheme to achieve rapid improvement and soil fertility increase of coastal saline-alkali land.
Keywords：Straw returningSoil organic carbonInorganic nitrogenAvailable phosphorusSoil en-zyme activityCoastal saline-alkali soil
Publication Date：2023-12-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 112-118 )