营林用火对2.5代杉木种子园土壤养分的影响研究

The Effect of Use of Fire in Silviculture on Soil Nutrient in the 2.5 Generation Seed Orchard of Cunninghamia lanceolata

通过对2.5代杉木种子园样地土壤表层的枯枝落叶进行营林用火处理,分析了营林用火对土壤养分（有机碳、全氮、全磷）的影响。结果表明：（1）营林用火后,土壤有机碳含量显著增加。对照、1M（用火1个月后）和3M（用火3个月后）有机碳含量分别为51.73g·kg-1、59.33g·kg-1、68.17g·kg-1。（2）营林用火后,土壤全N含量增加。对照、1M和3M的全N含量分别为4.06g·kg-1、4.39g·kg-1、4.66g·kg-1。（3）全P的变化情况与有机碳和全N的不一致。0~40cm土壤,全P含量最高的是用火后一个月（1M）,最低的是对照。可见,营林用火后,土壤有机碳含量、全N含量和全P含量均有不同程度的增加。因此,合理营林用火,有利于提高土壤肥力,具有一定的经济效益和生态效益。

This paper studied on soil nutrients （organic carbon, total nitrogen, and total phosphorus）by controlling fire litter in the 2.Sgeneration seed orchard sample area.The results show that, （1）The content of soil organic carbon increased significantly, ck, 1 M and 3 M organic carbon content are 51.73g. kg-1, 59.33g. kg-1, 68.17g. kg-1.（2）The soil total N content increased, ck, 1M and 3M total nitrogen is 4.06g. kg-1, 4.39g. kg-1, 4.66g. kg-1 respectively. （3） The changes of the total P are different with organic carbon, soil total P content is highest in the fire after a month （1M）. After forest fire, soil organic carbon content, total N content and total P content have increased in varying de- grees. Carrying on the reasonable use of fire, which is beneficial to improve soil fertility, has a certain economic bene- fits and ecological benefits.