The landfill leachate was collected from Dalian Maoyingzi Municipal Solid Waste Landfill, which contained high level TN (9.8 × 10² mg·L^–1) and TOC (4.8 × 10³ mg·L^–1). Its color was dark brown and smelled bad. The cultivated onland located in the South Area of Dalian Jiaotong University. The main onland plant was reed (Phragmites) with a spacing of 0.5 m, and the roots extended about 30 cm depth under the onland surface. Preparing instruments and medicines used for analyzing the TN and TOC by international standard methods, and Marriott Bottles, polyethylene plastic films, collecting basins, tape measure, shovel, pickaxe, scraper knife, adhesive tapes, sieve, bezel and some other equipment and tools.

The schematic diagram of experiment ground can be seen from Figures. Digging the soil in between the reed of 2 ridges with long (1 m), wide (0.34 m) and depth (0.25 m), and became the furrow, and dripping the landfill leachate (Figure 1) and the deionized water (Figure 2) into the furrow with two times, irrigating the volume

of the water and the landfill leachate was 39 L and 9 L, respectively. The experiment was 4 times of repeats. While the water and the landfill leachate had permeated the ground, having been taken 1 kg of the soil nearby 5 cm of the furrow were 12 samples, and N, C and water concentrations in the samples were measured by semimicro-Kjeldahl azotometer, external heating potassium dichromate and drying and weighing method.

Total nitrogen in the 48 L of the landfill leachate is 47.14 g, and the soil (valume 1.00 × 0.25 × 0.34 m, density 2.65 g/cm³ and background value 0.58 g/kg) is 130.65 g. It is 177.79 g of both in the landfill leachate and the soil. The total nitrogen content in the soil might be 0.79 g/kg as the theory. In 1 day after treatment, the 0.76 g/kg its content was measured (Figure 3), The content was very significantly different (P < 0.01) from the deionized water (0.53 g/kg) and background value (0.58 g/kg). The landfill leachate surely increases the nitrogen concentrations in the soil. No significant difference (P > 0.05) of the contents was measured between the deionized water and the background value. The TN concentration was decreased from 9.8 × 10² mg·L^–1 in the landfill leachate to 7.6 × 10² mg·L^–1 in the soil water, and the 22.4% of the removal rate.

The total carbon of 48 L of the landfill leachate is 228.77 g, and the soil (valume 1.00 × 0.25 × 0.34 m, density 2.65 g/cm³ and background value 4.67 g/kg) is 1051.92 g. It is 1280.69 g of both in the landfill leathate and the soil. The total carbon content might be 5.69 g/kg as the theory. In 1 day after treatment, the 10.01 g/kg of its content was measured (Figure 4). The content was very significantly different (P < 0.01) from it in the treatment of the deionized water (7.81 g/kg) and background value (4.67 g/kg); the contents in the treatment of the deionized water was very significantly different (P < 0.01) from the background value. Water and landfill leachate surely increase the total carbon contents. The TOC concentration was decreased from 4.8 × 10³ mg·L^–1 in the landfill leachate to 1.0 × 10³ mg·L^–1 in the soil water, and the 79.2% of removed rate.

In the 1 day after the treatments, the average water contents of the background value, the deionized water and

the landfill leathate in the soil were 9.51%, 17.23% and 17.18%, respectively. It ranged from 7.41% to 10.71% in the soil of the background value, from 12.50% to 20.00% in soil of the deionized water and from 15.79% to 18.52% in the soil of the landfill leathate. It was no significant difference (P > 0.05) of irrigation between the water and the landfill leachate, and background value. First time, HRT of irrigating 39 L the deionized water was 15 hours and it of the landfill leathate was 12.9 hours; then it of the 9 L of the deionized water was 8.3 hours and the landfill leathate was 7.0 hours. ΔHRT was 2.1 hours in irrigation 39 L of the water and landfill leachate and 1.3 hours in the 9 L. To some extent, the landfill leathate increased the leakage of water and solute loss, and reduced the HRT of pollutants in soil. It was in accordance with Chen et al. [10]. Hydraulic load of the landfill leathate was 1.70 × 10³ m³/(ha·d) and it of the deionized water was 1.45 × 10³ m³/(ha·d), it was 16.9% higher than hydraulic load of the deionized water.