杉木土壤肥力观测及叶片营养分析

SOIL FERTILITY MONITORING AND ANALYSIS ON LEAVE NUTRIENT ELEMENTS FOR CHINESE FIR

土壤肥力变化是造林地环境评价的主要内容之一。本研究通过对杉木造林地土壤的肥力观测分析，为杉木造林地的环境评价和防止杉木人工林地土壤肥力衰退，改善营林措施提供重要参考。１试验地基本情况试验地位于云南省东部罗平县八大河乡，东经１０４°４０′，北纬２４°２...

The results of soil monitoring in the fourth year of plantation indicate that afforestation with Chinese fir leads to the decrease in contents of organic matter, rapidly available phosphorus, rapidly available potassium, hydrolytic acid, exchangeable Mg 2+ , moreover leads to the decrease of pH value, so that, the soil fertility of forest land tends to degeneration, however fertilization can avoid soil degeneration and improve soil fertility of the forest land. When calcium magnesium phosphate is used as base fertilizer, soil fertility indexes, such as organic matter, rapidly available nitrogen, rapidly available phosphorus, rapidly available potassium, exchangeable Ca 2+ , exchangeable Mg 2+ and the pH value can be increased. The results also show that the increase of soil fertility indexes is related with the amount of calcium magneaium phosphate applied. The contents of the 5 main nutrients in leaves of Chinese fir sapling are related with the season and the stand age. The contents of all the nutrients in winter are higher than those in summer, as the age of stand increases, the content of total nitrogen decreases while that of total phosphorus, total potassium, total calcium, total magnesium increases.