采伐剩余物管理对杉木人工林土壤和叶片δ^(15)N的长期效应  

Long-Term Effects of Harvest Residue Management on Soil and Foliar δ^(15)N of Chinese Fir Plantations

作　　者：刘瑞强[1,2] 何宗明[3] 黄志群[1,2] 范少辉 万晓华[1,2] 杜婷 苏慧琴 

机构地区：[1]湿润亚热带山地生态国家重点实验室培育基地,福州350007 [2]福建师范大学地理科学学院,福州350007 [3]福建农林大学林学院,福州350002 [4]国际竹藤中心,北京100102 [5]福建峡阳国有林场,南平353005

出　　处：《林业科学》2014年第12期7-13,共7页Scientia Silvae Sinicae

基　　金：2011年教育部新世纪优秀人才支持计划(DB-168);2012年福建省杰出青年科学基金项目(2060203)

摘　　要：利用福建省南平市峡阳国有林场杉木人工林5种采伐剩余物管理措施(炼山、收获采伐剩余物和地被层、全树收获、仅收获树干和树皮以及加倍采伐剩余物)下0~40 cm土层土壤δ15N 15年的监测数据和造林后第15年叶片δ15N、氮磷含量和氮磷比数据,探讨采伐剩余物管理措施对杉木人工林土壤氮循环的长期影响。结果表明:在所有取样年份(造林后第3,6,9,12和15年),采伐剩余物管理措施对土壤δ15N均无显著影响;0~10 cm土层土壤δ15N与凋落物量显著正相关,与0~10 cm土层土壤微生物生物量氮含量极显著负相关;造林后第15年,采伐剩余物管理措施对叶片δ15N、叶片δ15N富集指数(δ15Nfoliar-δ15Nsoil)、叶片氮磷含量和氮磷比均无显著影响;土壤和叶片δ15N与0~10 cm土层土壤全氮含量、热水浸提的有机氮含量均显著负相关;不同采伐剩余物管理措施下土壤全氮含量、热水浸提氮含量、微生物生物量氮含量以及所有取样年份的凋落物量均无显著差异。研究表明,采伐剩余物管理措施对亚热带杉木人工林土壤氮循环的长期影响不显著。We measured the changes of δ^15N in the mineral soil （0 -40 cm layers） in Chinese fir （Cunninghamia lanceolata） plantations which were subjected to five harvest residue management treatments in subtropical China between 1999 and 2011. These treatments included： burning residue, whole tree harvest plus forest floor removal, whole tree harvest, stem only harvest and double residue. The results showed that there were no significant differences in soilδ^15N at any age of the plantation among treatments. Soil δ^15N in 0 -10 cm layers presented significantly positive correlation with litter production, and significantly negative correlation with microbial biomass nitrogen, respectively. There were no significant differences in foliar δ^15N, foliar ^15 N enrichment factors （δ^15Nfoliar - δ^15Nsoil ） , foliar nitrogen and phosphorus concentrations, and nitrogen/phosphorus ratio at age of 15 years among treatments. Soil and foliar δ^15N presented significantly negative correlations with soil total nitrogen（ TN）, and hot water extractable nitrogen in 0 to 10 cm layers, respectively. But, ANOVA showed that harvest residue management had no significant effects on soil TN, hot water extractable nitrogen and microbial biomass nitrogen in the 15-years-old plantation, and litter production at any age of years. These observations suggested that the long-term effect of harvest residue management on nitrogen cycling in soil was not significant in subtropical China.

关 键 词：杉木 氮循环 采伐剩余物管理 δ^15N 

分 类 号：S714.5[农业科学—林学] S750