文献类型：期刊文献

英文题名：Stem respiration and chemical composition in Dalbergia Odorifera plantations differing in soil moisture content

作者：Cui, Z. Y.[1,2] Yang, Z. J.[1] Xu, D. P.[1] Xi, R. C.[2] Zhang, N. N.[1] Liu, X. J.[1] Hong, Z.[1]

第一作者：崔之益;Cui, Z. Y.

通信作者：Cui, ZY[1];Xu, DP[1];Cui, ZY[2];Xi, RC[2]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China;[2]South China Agr Univ, Fac Forestry & Landscape Architecture, Guangzhou 510642, Guangdong, Peoples R China

年份：2017

卷号：134

期号：4

起止页码：347-365

外文期刊名：AUSTRIAN JOURNAL OF FOREST SCIENCE

收录：;Scopus(收录号：2-s2.0-85040447634);WOS:【SCI-EXPANDED(收录号:WOS:000422761600003)】；

基金：This study was sponsored by the Fundamental Research Funds for the Central Nonprofit Research Institution of Chinese Academy of Forestry (CAFYBB2016ZX003-4, CAFYBB2017ZX001-4) and the National Natural Science Foundation of China (grant nos. 31470026 and 30872052).

语种：英文

外文关键词：drought; nitrogen; non-structural carbohydrates; stem respiration

摘要：Few study examined the possible influence of artificially altering soil moisture content on stem respiration (R-s) and stem chemical composition together, we artificially simulated four soil moisture gradients in Dalbergia odorifera (D. odorifera) plantations and investigated R-s, predawn shoot water potential (psi(pd)), nitrogen content, and non-structural carbohydrates (NSCs) over time. Stem temperature (T-s) and R-s declined continuously during the dry period and reached their minimum values in January. Irrigation increased the R-s rate, while drought decreased it. The nitrogen content of the sapwood remained constant until December, after which it decreased when winter began. During the winter, the sapwood nitrogen increased under irrigation but decreased under drought conditions. The soluble sugars tended to increase during the dry period at the cost of starch, which caused a small but non-significant increase in NSCs. The effect of water treatments on total NSCs was limited; however the drought treatments increased the soluble sugars content but decreased the starch content. R-s explained 49, 72 and 40% of the seasonal variation in the stem nitrogen, starch and soluble sugars, respectively. The psi(pd) significantly explained 49, 79 and 85% of the variation in the R-s, stem starch and soluble sugars, respectively. Thus, soil moisture content likely affects R-s by affecting the amount of sapwood nitrogen, starch and soluble sugars. Low soil moisture content induced by drought enhanced the transformation of starch to soluble sugars during the winter, when heartwood formed. These strong relationships may provide interesting implication for future study on heartwood formation.