Influence of planting hole control body on water movement of saline soil

In order to make a plant hole into a basic unit to regulate soil water movement, improve the forestation survival rate and land-using value of saline soil, the authors selected structure factors (including woody plant, material used for planting-hole bag, dispensation radio of membrane material, dispensation radio and thickness of filling material) of planting hole control body (PHCB) and environment factors (including groundwater mineralization, soil texture and supplementary water capacity) as influencing factors, combined microcosm experiment technology, and used a hybrid homogeneous design U12 (12×43×34) to arrange the experiments for obtaining the optimal configuration parameters and establishing a predictive equation which could show the relationships between influencing factors and soil moisture. The results of regression analysis indicated that: on condition that the supplementary water capacity was up to 5.06 mm, and light clay soil as soil texture, prunus cerasifera as woody plant, linen used for material of the plant hole, membrane material made of PVA (polyvinyl alcohol), VAE (vinyl acetate-ethylene copolymer emulsion) and montmorillonite with volume ratio of 100︰20︰10, and filler made from straw, litter and wood chips with mass ratio of 1︰1︰2, soil moisture could be increased 48.83% inside the planting hole. While the groundwater mineralization and thickness of filler material were not significant influences on water movement in the plant hole. PHCB is able to be used to regulate the process of soil water movement effectively, which is a method for ecological restoration of saline soil.