废弃矿山客土喷播恢复初期基材养分动态变化

Nutrient Dynamic Changes of Base Material in the Incipient Ecological Restoration of Abandoned Mines Rock Slope with the External-soil Spray Seeding Technique

以南京青龙山废弃矿山地质环境整治工程为依托,通过对客土喷播试验工程基材养分进行现场跟踪测试,分析了喷播基材养分的时间变化特性。结果表明:有机质、全氮、速效氮、速效磷和速效钾含量随喷播时间的延长出现了不同程度的降低,喷播后第3年分别比喷播时降低了4.05%～8.26%、1.78%～2.10%、8.46%～11.24%、1.10%～1.65%、9.35%～14.45%。喷播后各年份有机质、速效氮、速效磷含量分别在坡下、坡中、坡上相互间差异显著(P<0.05),喷播后第1年速效钾含量在坡下、坡中、坡上差异极显著(P<0.01),第2年、第3年差异显著(P<0.05)。喷播后各年份有机质和全氮含量表现为坡中>坡下>坡上的分布规律,速效氮、速效磷和速效钾均表现为坡下>坡中>坡上的规律。

With the engineering of environmental geological restoration of abandoned mines rock slope of the Qinglong mountain in Nanjing,the temporal characteristics of base material nutrition through a series of testing and analyzing of nutrient components of the spraying base material were analyzed. The results showed that the contents of the available organic matter, total nitrogen, available nitrogen, available phosphorus and available potassium tended to decrease. It decreased by 4. 05%-8. 26% ,1.78%-2. 10%,8. 46%-11.24% ,1.10%-1. 65% ,9. 35%-14. 45% in the third year after spraying,respectively. Among the lower slope position,the middle slope position and the upper slope position, the available organic matter,available nitrogen and available phosphorus had showed more remarkable difference（P〈0. 05） among different slope positions each year after spraying, respectively. The available potassium content had showed extremely significant differences（P〈0. 01） in the first year after spraying and significant difference （P〈0. 05）in the second and third year after spraying among different slope positions. The available organic matter and total nitrogen contents had showed consistent trends：the middle slope position〉the lower slope positio〉the upper slope position. The available nitrogen,available phosphorus and available potassium contents had showed consistent trends the lower slope position〉the middle slope position〉the upper slope position,eachyear after spraying,respectively.