Effects of biochar and PAM application on saline soil hydraulic properties of coastal reclamation region

doi:10.13287/j.1001-9332.201711.014

Abstract

Abstract: Disc infiltration tests were carried out to study the soil infiltration characteristics under different rates of soil amendments application, and to investigate the effects of biochar and polyacrylamide (PAM) application on saline soil hydraulic properties, pore characteristics and contribution of each pore to soil water flow in coastal reclamation region. The results showed that soil satura-ted hydraulic conductivity increased by 46.4% when biochar was applied at 2% compared with the control, and decreased with increasing PAM application. The total effective soil porosity and r>100 μm pores were increased by 8.3% and 10.2% (P<0.05) with the application of 2% biochar alone. The total effective soil porosity and different radius pores decreased with the PAM application. Particularly, the total effective soil porosity decreased markedly when PAM was applied at 1‰ and the reduction was up to 88%. With the application of biochar and PAM, the contribution of r<100 μm pores to water flow decreased and the pores with r>500 μm played a major role in determining water flows.

CAO Yu-tong, SHE Dong-li. Effects of biochar and PAM application on saline soil hydraulic properties of coastal reclamation region[J]. Chinese Journal of Applied Ecology, 2017, 28(11): 3684-3690.

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