作 者：
段春燕;徐广平;沈育伊;罗亚进;李艳琼;张德楠;孙英杰;何成新
单 位：
广西喀斯特植物保育与恢复生态学重点实验室广西壮族自治区中国科学院广西植物研究所;广西植物功能物质研究与利用重点实验室广西壮族自治区中国科学院广西植物研究所;广西师范大学珍稀濒危动植物生态与环境保护教育部重点实验室;广西师范大学生命科学学院;广西雅长兰科植物国家级自然保护区管理局
关键词：
桉树人工林;林龄;土壤养分;生态化学计量;桂北丘陵地区
摘 要：
采用时空互代法,探讨不同林龄对桂北低山丘陵地区桉树林土壤SOC,TN,TP和TK养分变化及其生态化学计量学特征的影响。结果表明:1)随林龄的增加,SOC表现为先升高后降低再增加的趋势,TN无明显变化规律,TP趋于减少,TK表现为先减小后增大的趋势。不同林龄SOC,TN,TP和TK含量均随土层深度的增加而减少。2)随林龄的增加,土壤C∶N,C∶P,N∶P和C∶K表现为逐渐增大的趋势,N∶K表现为先增大后减小的趋势,P∶K无明显规律。随土层的加深,土壤C∶N逐渐增大,N∶P,N∶K逐渐减小。C∶P,C∶K和P∶K无明显变化规律。3) SOC与C∶P,N∶P,N∶K呈极显著正相关,TN与N∶P,N∶K呈极显著正相关。TP与N∶K呈极显著正相关,TK与N∶P呈极显著正相关。不同林龄、土层深度均影响土壤养分的分配,土壤养分对桉树林土壤化学计量的贡献表现出一定的差异性。
译 名：
Ecological Stoichiometry Characteristics of Soils in Eucalyptus Plantations with Different Ages in North Guangxi
作 者：
DUAN Chunyan;XU Guangping;SHEN Yuyi;LUO Yajin;LI Yanqiong;ZHANG Denan;SUN Yingjie;HE Chengxin;Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection,Guangxi Normal University,Ministry of Education;College of Life Sciences,Guangxi Normal University;Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain,Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences;Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization,Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences;Administration Bureau of Yachang Orchid National Nature Reserve;
单 位：
DUAN Chunyan%XU Guangping%SHEN Yuyi%LUO Yajin%LI Yanqiong%ZHANG Denan%SUN Yingjie%HE Chengxin%Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection,Guangxi Normal University,Ministry of Education%College of Life Sciences,Guangxi Normal University%Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain,Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences%Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization,Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences%Administration Bureau of Yachang Orchid National Nature Reserve
关键词：
Eucalyptus plantations;;forest age;;soil nutrient;;ecological stoichiometry characteristic;;hilly area of northern Guangxi
摘 要：
By using the space-time intergenerational method,the Eucalyptus plantations of different ages of plantation in low hilly areas at Guangxi were taken as the research object. The effects of forest age on soilorganic carbon(SOC),total nitrogen(TN),total phosphorus(TP) and total potassium(TK) and their ecological stoichiometric characteristics of soils were studied. The results showed that: 1) With the increase of Eucalyptus forest age,SOC showed a trend of increasing first,then decreasing and increasing again. TN had not evident regular change. It showed that the trend of decreasing first and then increasing later for TK. SOC,TN,TP and TK concent in the five different plantations decreased significantly with the increase of soil depth. 2) The C ∶ N,C ∶ P,N ∶ P and C ∶ K ratios of soil increased significantly with the growth of forest age. The N ∶ K ratios increased first and then decreased. There are no obvious regular patterns for P ∶ K ratios of soil. The C ∶ N ratios increased with the increase of soil depth,the N ∶ P and N ∶ K ratios decreased on the contrary,but C ∶ P,C ∶ K and P ∶ K ratios showed no consistent pattern. 3) It showed that significant positive correlation was found between SOC content and C ∶ P ratios,N ∶ P ratios and N/K ratios; among TN content,N ∶ P ratios and N ∶ K ratios; between TP content and N ∶ K ratios and between TK content and N ∶ P ratios. Different forest ages and soil depths all affected the distribution and utilization of soil nutrients. In general,the ecological stoichiometric ratios of soils from surface are higher than those of sub-layer soil. It will provide the scientific basis for the restoration of the forest ecosystem in Guangxi Province.
