Study on effect and evaluation of tree species on reclamation soil fertility quality in coal mining area

In order to explore the influence of artificial forests on soil fertility levels， three typical plantations PopulusL.forest， Ligustrum lucidum forest and Sabina chinensis(L.) Antoine forest of Panyi mining reclamation areas were studied.Through field investigation and laboratory experiment，nine indexes such as bulk density， pH value， organic matter， total nitrogen， available nitrogen， total potassium， available potassium， total phosphorus， available phosphorus were determined in different depth under the forest.The soil fertility of three kinds of forest land was quantitatively analyzed by using the method of grey correlation degree， and sequencing based on comprehensive evaluation conducted.The results showed that：①The results of one-way ANOVA showed that there was no significant difference among three forest land soil pH， total nitrogen， total phosphorus， total potassium among different species (P ＞ 0.05)， and soil bulk density， organic matter， available nitrogen， available phosphorus， available potassium among different species (P ＜ 0.05).②Compared with the second National Soil Census nutrient grading standard and the monitoring results of soil fertility indicators in 2009， the fertility levels of five fertility indicators， such as bulk density， organic matter， available phosphorus， total potassium and available potassium were signifi-cantly improved.The soil fertility levels of pH value， total nitrogen， available nitrogen and total phosphorus were consistent with that of 2009.Total phosphorus and available nitrogen can be used as limiting factors of soil fertility improvement in reclamation area.③The order of the comprehensive evaluation value of the weighted grey correlation degree of the three kinds of forest land soils was Populus L. forest ＞Sabina chinensis(L.) Antoine forest ＞ Ligustrum lucidum forest.Among them， the soil of Populus lasiocarpa Oliv. forest land belonged to grade Ⅰ(excellent) level， Sabina chinensis(L.) Antoine forest land and Ligustrum lucidum forest land belonged to grade Ⅱ(good)，which showed that the soil of poplar forest is the most fertile. Populus lasiocarpa Oliv. has important functions and functions of improving soil nutrients， improving environment and soil and water conservation. Populus lasiocar pa Oliv. can be used as the dominant tree species for afforestation in reclamation area.This study can provide a scientific theoretical basis for the sustainable utilization of reclaimed soil and ecological restoration in the subsidence area of coal mine.