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木荷稳定碳同位素分辨率的种源差异
引用本文:林磊,周志春,范辉华,金国庆,陈奕良,洪桂木.木荷稳定碳同位素分辨率的种源差异[J].应用生态学报,2009,20(4):741-746.
作者姓名:林磊  周志春  范辉华  金国庆  陈奕良  洪桂木
作者单位:1. 中国林业科学研究院亚热带林业研究所,浙江,富阳,311400
2. 建瓯市林业技术推广中心,福建,建瓯,353100
3. 浙江省庆元县庆元林场,浙江,庆元,323800
4. 浙江省淳安县富溪林场,浙江,淳安,311700
基金项目:国家林业局重点项目,浙江省科技专项重点项目,浙江省与中国林业科学研究院重点合作项目,浙江省林业厅林木良种基础研究项目 
摘    要:利用设置在福建建瓯、浙江淳安和浙江庆元3个区试点的5年生木荷种源试验林,选取18个代表性种源测定叶片的稳定碳同位素分辨率(Δ值),研究其在种源间的差异和地理变异模式,以及造林立地环境和种源生长对其的影响.结果表明:木荷种源叶片稳定碳同位素分辨率存在很大差异,福建建瓯、浙江淳安和庆元3个区试点的叶片Δ值最高和最低种源分别相差6.9%、3.0%和3.7%.种源叶片Δ值与其产地纬度呈显著负相关,而与产地经度的相关性较小,表现为典型的纬向渐变模式,来自木荷分布区南部的种源叶片Δ值较大,说明其长期水分利用效率较低.随着造林立地环境的改善和年降雨量的增多,木荷叶片Δ值显著增加.种源叶片Δ值与其树高、胸径、一级侧枝总数和最大侧枝长等皆呈显著正相关,树冠浓密的速生种源具有较高的Δ值.此外, 在木荷中心产区(福建建瓯)和边缘产区(浙江淳安)分别初选出2个和4个水分利用效率高的速生优良种源,供推广应用.

关 键 词:木荷  种源  稳定碳同位素分辨率(Δ)  δ13C值  地理变异
收稿时间:2008-8-24

Provenance difference in stable carbon isotope discrimination of Schima superba.
LIN Lei,ZHOU Zhi-chun,FAN Hui-hua,JIN Guo-qing,CHEN Yi-liang,HONG Gui-mu.Provenance difference in stable carbon isotope discrimination of Schima superba.[J].Chinese Journal of Applied Ecology,2009,20(4):741-746.
Authors:LIN Lei  ZHOU Zhi-chun  FAN Hui-hua  JIN Guo-qing  CHEN Yi-liang  HONG Gui-mu
Institution:Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400, Zhejiang, China;Jian’ou Extending Center for Forestry Science &; Technology, Jian’ou 353100, Fujian, China;Qingyuan Forest Farm, Qingyuan 323800, Zhejiang, China;Chun’an Fuxi Forest Farm, Chun’an 311700, Zhejiang, China
Abstract:The difference in leaf stable carbon isotope discrimination (Δ) of 18 representative Schima superba provenances was investigated based on three p rove nance trails located at Jian’ou of Fujian Province and Chun’an and Qingyuan of Zhejiang Province, and the geographic variation pattern and the effects of trial site and provenances growth rate were studied. Significant differences in leaf Δ were observed among the provenaces, and the differences in leaf Δ value betw een the highest and lowest provenances reached 69%, 30%, and 37% in 3 exper imental sites, respectively. A classic latitudinal clinal variation pattern was found, because there were significant correlations between the leaf Δ value and the latitude of seed sources in all the 3 sites while no significant correlatio ns were observed between the leaf Δ value and the longitude of the seed sources . The southern provenances showed higher leaf Δ value than the northern provena nces, indicating that the water use efficiency (WUE) was lower in southern prove nances. The leaf Δ value of different provenances was demonstrated to be greatl y affected by the environment of trial sites. The leaf Δ value increased signif icantly with the improvement of site environment and with the increase of annual rainfall. Significant positive correlations were observed between the leaf Δ v alue and the growth traits including tree height, DBH, total number of lateral b ranches, and length of the strongest lateral branch, which indicated that the pr ovenances with higher growth rate and denser crown had larger leaf Δ value. Two and four superior provenances with high growth rate and low leaf Δ value (or h igh WUE) were selected for Jian’ou of Fujian and Chun’an of Zhejiang, respecti vely.
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