文献类型：期刊文献

英文题名：Effect of Fall-applied Nitrogen on Growth, Nitrogen Storage, and Frost Hardiness of Bareroot Larix olgensis Seedlings

作者：Li, Guolei[1] Liu, Yong[1] Zhu, Yan[1] Li, Qingmei[2] Dumroese, R. Kasten[3]

第一作者：Li, Guolei

通信作者：Li, GL[1]

机构：[1]Minist Educ, Key Lab Silviculture & Conservat, Beijing 100083, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Key Lab Forest Silviculture State Forestry Adm, Beijing 100091, Peoples R China;[3]US Forest Serv, USDA, Rocky Mt Res Stn, Moscow, ID USA

年份：2012

卷号：46

期号：3

起止页码：345-354

外文期刊名：SILVA FENNICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000310657200004)】；

基金：The study was supported by the Fundamental Research Funds for the Central Universities (Contract No. JD2011-3, TD2011-08 & BLJD200905). We specially thank the Meteorological Observing Team in College of Forestry, Beihua University for their assistance with providing weather data; Mr. Richard R. Faltonson for editing the English of early versions; and the anonymous reviewers for their insightful comments of the manuscript.

语种：英文

外文关键词：deciduous trees; fall fertilization; frost hardiness; Olga Bay larch

摘要：Nursery response of evergreen trees to fall fertilization has been studied widely, but little attention has been given to deciduous trees. Bareroot Olga Bay larch (Larix olgensis Henry) seedlings were fertilized in the nursery with urea at four rates (0,30,60,90 kg N ha(-1)), with half of each rate applied on two dates (September 16 and October 1,2009). The seedlings were excavated for evaluation on October 15. In the unfertilized (control) treatment, root and shoot dry mass increased by 100% and 57% respectively, while N concentration in the roots and shoots increased by 43% and 40% during the 30 clay period. This indicated that substantial biomass growth during this period did not lead to internal nutrient dilution. Root dry mass increased when fall fertilization rates were >= 60 kg N ha(-1). Fall fertilization increased N concentrations in root tissue by 48-73%. Compared with the control, shoot tissues of fall fertilized seedlings had slightly higher N concentration and content and significantly higher frost hardiness.