EFFECTS OF SAND COATING TECHNOLOGY ON CARBON POOL AND SOIL ENZYME ACTIVITY IN SALINE SOIL ECOSYSTEM

In order to study the changes of soil carbon pool and enzyme activities after saline land remediation, carbon, protease, catalase, urease and phosphatase contents in soil samples and plant samples collected from the project area were analysed. After 2 and 4 years of saline-alkali remediation, the total carbon content in 0-20cm soil surface decreased significantly by 24-63%, the organic carbon content in 0- 10 cm soil surface decreased significantly by 32-35%, the organic carbon content of 10-60 cm soil increased significantly by 23-42%. The inorganic carbon content of soil profile decreased significantly by 21-72%. In the range of 60 similar to 100 cm, it increased significantly by 32 similar to 60%. At the early stage of the remediation, the activities of urease and catalase in soil profile decreased gradually with the increase of soil depth. The carbon density of 2 years after remediation is 26 times of that before regulation, and the carbon density of 4 years after remediation is significantly increased by 37.72% compared with that of 2 years after remediation. After the remediation, the project measures accelerated the process of soil cultivation and created a better habitat for the survival of crops in the project area. Under the influence of soil structure and crop root exudates, soil biochemistry has significantly contributed to carbon storage and enzyme activity in the ecosystem.