杉木、马尾松轮作对林地土壤肥力和林木生长的影响

研究了杉木、马尾松人工林轮作对林地土壤肥力和林木生长的影响。结果表明：与连作相比，轮作林分土壤微生物数量增多，酶活性增强、土壤酚类物质减少、土壤酸度降低，盐基总量和盐基饱和度提高以及土壤有效养分增加，并由此导致了林分生长量的提高。轮作林分土壤肥力提高，林分生长量增加的实质在于：人工林林分实施轮作后，由于后茬植物与前茬植物种类的不同导致土壤微生物种类和数量增多，土壤生物活性增强，并由此而导致土壤酸度降低，有毒物质减少，速效养分增加。

THE EFFECTS OF ROTATING PLANTATION ON THE SOIL FERTILITY OF FOREST LAND AND THE GROWTH OF STAND

The effects of rotating plantation on the soil fertility of forest land and the stand growth were studied in Songxi County,Fujian Province.The results were as follows:Compared with the soil of continuous plantation,the microorganism quantities of soil in rotating plantation were increased,enzyme activities were strengthened,the contents of phenolic substance was decreased,acidity was reduced,base content was raised,base saturation degree and available nutrient contents were increased,and from these,stand growths were improved.The essence that the soil fertility in rotating plantation stand were improved and stand growth was increased lie in:Because the substitute species was different from the fore species,the microorganism species and quantities of soil of rotating plantation were increased and the enzyme activities were strengthened,and thereby,acidity was reduced,toxic compounds were decreased and available untrient contents were improved.