摘要
以桂北地区的4年生、20年生桉树林和22年生马尾松林为研究对象.于2012年 9~11月分别对这3种林分的土壤呼吸及其组分、土壤温度、土壤湿度进行了3个月的观测.结果表明:(1)4年生桉树林及22年生马尾松林的土壤呼吸速率显著大于20年生桉树林,4年生桉树林与22年生马尾松林无显著差异;(2)3种林分自养呼吸速率 4年生桉树林显著大于20年生桉树林及22年生马尾松林:异养呼吸速率22年生马尾松林显著大于 4年生桉树林及20年生桉树林.4年生桉树林的自养呼吸贡献率明显大于20年生桉树林和22年生马尾松林;(3)相关性分析表明,土壤温度是影响土壤呼吸及其组分的主要环境因子,3种林分土壤温度与土壤呼吸均呈显著的指数关系.22年生马尾松林的土壤呼吸与土壤含水量呈显著负相关关系,2种桉树林的土壤呼吸与土壤含水量的相关性不显著;(4)对温度敏感性系数 Q10值的分析表明,3种林分中20年生桉树林和22年生马尾松林的温度敏感性较大,4年生桉树林最小.
The experiment were conducted on the young-growth Eucalyptus spp.forest(4 a),old-growth Eucalyptus spp.forest(20 a)and the Pinus massoniana forest(22 a)from September 2012 to November 2012 in Yaoshan Moun-tain of Guilin,the soil respiration and its components,the soil temperature and the soil water content of the three stands had been observed.The results were as follows:(1)The soil respiration rate of the young-growth Eucalyptus spp.forest(4 a)and the Pinus massoniana forest(22 a)were higher than the old-growth Eucalyptus spp.forest(20 a)significantly,but not significant difference between the young-growth Eucalyptus spp.forest(4 a)and the Pinus massoniana fores(22 a)t;(2)In the three stands,the autotrophic respiration rate of the young-growth Eucalyptus spp.forest(4 a)was higher than the old-growth Eucalyptus spp.forest(20 a)and the Pinus massoniana forest(22 a).The heterotrophic respiration rate of the Pinus massoniana forest(22 a)was higher than the young-growth Euca-lyptus spp.forest(4a)and the old-growth Eucalyptus spp.forest(20 a).The rate of contribution of autotrophic res-piration of the young-growth Eucalyptus spp.forest(4 a)was significantly greater than the old-growth Eucalyptus spp.forest(20 a)and the Pinus massoniana forest(22 a);(3)According to correlation analysis,we knew that the soil temperature was the main environmental factor influencing the soil respiration rate and its components.There ex-isted exponential relationship between the soil temperature and the soil respiration rate and its components.There were notable negative correlations between soil respiration rate and soil moisture content in the Pinus massoniana forest(22 a),but not significant correlation in the young-growth Eucalyptus spp.forest(4 a)and the old-growth Eu-calyptus spp.forest(20 a);(4)As for the three stands,the Q10 value analysis of the temperature sensibility coeffi-cient indicated that the value of the old-growth Eucalyptus spp.forest (20 a)and the Pinus massoniana forest(22 a) were the higher and the young-growth Eucalyptus spp.forest(4 a)was the lowest.
出处
《广西植物》
CAS
CSCD
北大核心
2014年第6期780-787,共8页
Guihaia
基金
广西科技重大专项(2010GXNSFD169007
桂科基1123014
11166-01
桂科基11199001)
广西研究生教育创新计划(YCSZ2012055)
广西高校科研项目(2013ZD008)
广西区学位点学科建设重点科学研究项目
珍稀濒危动植物生态与环境保护省部共建教育部重点实验室(桂科能1101Z003)
广西珍稀濒危动物生态学重点实验室研究基金(桂科能1301k005)
关键词
土壤呼吸
温度敏感性
桉树
马尾松人工林
秋季
桂林尧山
soil respiration
temperature sensitivity
Eucalyptus spp.and Pinus massoniana forest
autumn
Yaos-han Mountain of Guilin