纤维素钙基改良剂制备及其对盐渍土的改良效应OA

To explore the improvement effects of cellulose calcium-based amendments on saline-alkali soil,this research selects the moderately saline-alkali soil in the Qaidam Basin of Qinghai Province as the test soil.Using acid-treated corncob as the main raw material and phosphogypsum as the calcium-based auxiliary,this research prepares the cellulose calcium-based amendments via aqueous solution polymerization.Then it selects four types of amendments:pure cellulose-based amendment(COR)and three cellulose calcium-based amendments with higher water absorption(PGC2,PGC5 and PGC6),and sets three addition levels to study the improvement effects on saline-alkali soil through leaching tests.The results show that compared with CK,PGC5-B treatment reduces the soil pH by 1.75 units(P<0.05).The soil EC is less than 2 mS·cm-1,indicating that the improved soil is not threatened by alkalization.The content of mechanical large aggregates(>0.25 mm)in the soil increases by 0.86 times(P<0.05),while the content of micro-aggregates(<0.25 mm)decreases by 40.98%(P<0.05).In the 2 ‒ 0.25 mm aggregate fraction,the organic carbon content of soil aggregates increases by 2.37 times,and its contribution rate of soil organic carbon increases by 1.03 times.In the<0.053 mm aggregate fraction,the organic carbon content of soil aggregates increases by 1.19 times,while its contribution rate of soil organic carbon decreases by 68.96%.