Abstract:

The collapsed area of coal mine was filled with coal ash from thermal power plant, and covered with a surface soil layer of 30cm, then the area was reformed into "artificial soil". In 1990, Populus×euramericana cv. 'Neva' plantation was set up. The main measures are: (1) Treatment of different soil depth (0, 30, 55cm, and mixing soil and ash); (2) Treatment of fertilization (orthogonal design totally 16 treatments); (3) Treatment of appling green manure (planting 4 species of green manure crops or manuring with the same crops). The method for computer simulation is: firstly, pre-evluating the model's controlling point, then, using logistic equation to simulate the growth process of tree height and DBH, net present value(NPV) and internal receiving rate(IRR) used as the evaluation indexes for evaluating superior model. The results show that the first-class model is on the basis of covering 30cm soil layer, 0.5kg/hole P fertilzer applied as basal fertilzer, soaked irrigation once, and planting Sesbania in the row inter space or manuring Amorpha fruticosa in successive years. The maximum economic benefit can be achieved by it, and its IRR can reach over 18%. If taking the improvement of ecological envirnment as the main purpose, and increasing input to pursue even higher production of plantation, the best combination will just be the combinations of best ones in each single item experiment.

Key words: Poplar plantation, Management model