淮海经济区采煤塌陷复垦土壤化学计量特征Meta分析

Meta analysis of stoichiometric characteristics of reclaimed soil in coalmining subsidence area of Huaihai Economic Zone

利用Meta分析方法定量研究了淮海经济区采煤塌陷土壤在复垦时间、复垦方式等因素的影响下的化学计量特征,并对采煤塌陷区复垦土壤以及邻近标准农田土壤中的pH、有机质(SOM)、总氮(TN)、速效磷(AP)、速效钾(AK)含量进行对比。结果表明:复垦土壤SOM和AP含量总体上显著低于标准农田(P<0.05);与标准农田相比,复垦土壤pH、总氮和速效钾无显著差异(P>0.05);复垦土壤pH和AK效应值为正,总氮效应值为负;在0~20 cm土壤深度(耕作层),除土壤SOM和AP外其余土壤养分含量均与标准农田无显著差异(P>0.05);随着复垦时间的积累,在复垦后10~13 a基本可以恢复至标准农田水平;采煤塌陷区土壤复垦效果受复垦方式和复垦年限影响,不同土壤层次和区域存在差异;为达到最佳复垦效果,需要因地制宜,综合考量并采取适当的复垦方式。

The stoichiometric characteristics of coal mining subsidence soil in Huaihai Economic Zone influenced by reclamation time,reclamation methods and other factors were analyzed using Meta analysis method.The pH,soil organic matter(SOM),total nitrogen(TN),available phosphorus(AP)and available potassium(AK)of the reclaimed soil in the coal mining subsidence area and the surrounding standard farmland soil were compared.The results showed that the contents of SOM and AP of reclaimed soil were significantly lower than those of standard farmland(P<0.05).Compared with standard farmland,the pH,TN and AK of reclaimed soil were not significantly different(P>0.05).The pH and AK effect values of reclaimed soil was positive,and the TN effect values was negative.At the soil depth of 0~20 cm(cultivation layer),the contents of soil nutrient except SOM and AP were not significantly different from those of standard farmland(P>0.05).The soil nutrient contents could almost return to the standard farmland level after 10~13 years of reclamation.The effect of soil reclamation in coal mining subsidence area was affected by the reclamation methods and reclamation time,and varied in different soil levels and regions.In order to achieve the best recovery effect,it is necessary to adjust measures to local conditions,and adopt appropriate reclamation methods after comprehensive consideration.