闽南山区连续年龄序列桉树人工林土壤养分动态  

Soil Nutrient Dynamics in Sequencially Aged Eucalyptus Plantations in Mountainous Region of Southern Fujian,China

作　　者：樊后保[1] 袁颖红[1] 廖迎春[1] 李燕燕[1] 苏兵强 高春芬[1,3] 

机构地区：[1]南昌工程学院生态与环境科学研究所,南昌330099 [2]福建省国有林场管理局,福州350003 [3]江西农业大学园林与艺术学院,南昌330045

出　　处：《应用与环境生物学报》2009年第6期756-760,共5页Chinese Journal of Applied and Environmental Biology

基　　金：福建省林业厅科技项目资助(闽林科[2007]6号);江西省自然科学基金项目(No. 0630101)资助~~

摘　　要：对闽南山区连续年龄序列(2a、3a、4a、5a、6a)的尾巨桉(Eucalyptus urophylla×E.grandis)人工林土壤有机碳及氮、磷、钾含量进行了分析,以评价土壤养分随林分年龄的变化动态.土壤有机碳、全氮、水解氮、全磷、速效磷均表现出随林分年龄增加而增加,到4a生时达到最大,随后则呈下降趋势,6a生时下降到最低值.速效钾含量则随林分年龄增加逐步下降,6a生林分0～20cm、20～40cm和40～60cm这3个土层速效钾含量分别比2a生下降了53.2%、44.4%和55.2%;土壤全钾含量也表现出一定的下降趋势.所有年龄林分的土壤有机碳、全氮、水解氮、全磷、速效磷和速效钾含量均随土层深度增加而降低,而土壤全钾则表现出相反的趋势.因此,在桉树人工林经营过程中,应定期增施钾肥,适时施用有机肥及氮、磷肥,以控制地力衰退.The contents of soil organic carbon,nitrogen,phosphorus and potassium in sequencially aged （ 2-,3-,4-,5-,and 6-year old） Eucalyptus urophylla × E. grandis plantations were analyzed in the mountainous region of southern Fujian,China,to estimate the changes in soil nutrients with aging. The soil organic carbon content,total N,hydrolysable N,total P and available P increased with aging and reached maximum at 4 years of age,and thereafter decreased. Soil available K declined signif icantly with aging. Compared with the 2-year-old stand, soil available K under the 6-year-old stand decreased by 53.2%,44.4% and 55.2% at the soil depths of 0-20 cm, 20-40 cm and 40-60 cm, respectively. The soil total K also decreased with aging. The soil organic C, total N, hydrolysable N, total P, available P and available K supporting the plantations decreased with soil depth, in contrast the soil total K increased. Therefore, it is needed to apply K fertilizer regularly, and use organic manure, N and P timely in order to control soil degradation in the fast-growing eucalyptus plantation. Fig 4, Tab 2, Ref24

关 键 词：土壤养分动态 年龄序列 桉树人工林 闽南山区 

分 类 号：S714[农业科学—林学]