林业应用稀土的技术与效果

稀土在提高林木种子发芽率，促进杉木（Ｃｕｎｎｉｎｇｈａｍｉａ ｌａｎｃｅｏｌａｔａ（Ｌａｍｂ．）Ｈｏｏｋ．）、木荷（Ｓｃｈｉｍａ ｓｕｎｅｒｂａ Ｇａｒｄｎ，ｅｔ Ｃｈａｍｐ）、板栗（Ｃａｓｔａｎｅａ ｍｏｌｌｉｓｓｉｍａ Ｂｌｕｍｅ）、泡桐（Ｐａｕｌｏｗｎｉａ ｓｐ）、杨树（Ｐｏｐｕｌｕｓ ｓｐ）等的苗期生长提高苗木质量，提高湿地松（Ｐｉｎｕｓ ｅｌｌｉｏｔｔｉｉ Ｅｎｇｅｌｍ）、杉木种子园的种

TECHNIQUSE AND EFFECTS OF APPLING THE RARE-EARTH TO FORESTY

Since 1982, the experiments of the rare-earth application to forestry have been carried out with both pot-planted seedlings and field trees. The results proved that the rare-earth can increase the seed germination rate,and growth of forest trees at nursery stock stage, and improve the quality of nursery stockes, e. g. Cunninghamia lanceolata (Lamb. ) Hook,Schima superba Gardn, et champ, Castanea mollissima Blume, Paulownia sp., Populus sp.etc. It can also raise the seed yields and quality of Pinus elliottii Engelm and Cunninghamia lanceolata in a seed orchard. And there are obvious effects on the fruit set percentage and yields, as well as improving the quality of fruits for some dry or fresh fruit tree species, such as Juglant regia L.,Ziayphus jujuba Mill, Castanea mollissima, Mains pumila Mill, Pyrus bretschmeideri Rehd, Crataegus pinnstifida Bge, Diospyros kaki L., Prunus armeniaca L., and so on. The studies on physiological effects of it in forest tree species during its nursery stock stage, and in economic forest tree species during its flowering and fruiting period indicate that it can promot chlorophyll formation and mineral element absorption by roots, increase photosynthetic intensity and dry matter accumulation, as well influence the contents of some organic acids, protein, fat, sugar, and Vc etc in the fruitsand seeds. Now the technique for the rare-earth application to forestry have been used in production practice as a result of studing it for manyyears.