Effects Of Different Fertilization Patterns On Soil Respiration In Reclaimed Mining Area

In this study, soil physiochemical characteristics and seasonal variation of soil respiration, temperature and moisture were investigated under Lotus corniculatus, Medicago sativa, Salix matsudana Koidz-Sabina chinensis mixed forest and Pinus tabulaeformis plantation. The main results are as follows:1. Fertilization did not produce significant effects on soil pH, organic carbon, total nitrogen and annual average soil respiration under the same vegetation type.2. Seasonal variation of soil temperature showed a single peak and a Guassian equation between soil temperature and number of days reached the most significant correlation ships. Soil moisture fluctuated with season. Season tendencies of soil respiration were approximate to single peak, in addition, Guassian equation between soil respiration and number of days showed different correlation level.3. Vegetation types and fertilization would influence the correlation ships between soil respiration, and temperature and moisture. Few significant coefficients were found in L. corniculatus and M. sativa in single or double factors correlation models. The higher coefficients between soil respiration, and temperature and moisture were demonstrated under mixed forest and plantation. Under same vegetation type, the coefficient was higher in sites treated with organic and organic mixed with inorganic fertilization, which suggested that organics would promote the dependence of soil respiration on temperature and moisture. The selection of linear and nonlinear showed few effect on correlation level.Treatments with organic and organic mixed with inorganic fertilization improved soil physiochemical characteristics, raised soil respiration intensity, and developed soil quality. The fitted models of relationship of soil respiration, temperature and moisture were better under M. sativa and mixed forest which higher coverage compared to the other two vegetation types. With the extension of reclamation age, the synergic relationship including soil respiration, soil temperature and moisture would be improved. The results suggested that suitable regeneration types would be the configuration of M. sativa and S. matsudana Koidz-S. chinensis mixed forest, and organic fertilization would be practicable.