应用生态学报2017，Vol.28Issue(3)：763-771,9.DOI:10.13287/j.1001-9332.201703.034
黄土丘陵区油松、沙棘生长旺盛期树干液流密度特征及其影响因素
Characteristics and affecting factors of sap flow density of Pinus tabuliformis and Hippophae rhamnoides in growing season in the hilly region of the Loess Plateau, China
摘要
Abstract
The dynamic changes of sap flow density (Js) of Pinus tabuliformis and Hippophae rhamnoides in plantations from July to September in 2015 was monitored through thermal dissipation probe in the hilly region of the Loess Plateau.In addition,plant physiological characteristics were analyzed to determine the water use types of these two species.The results indicated that the daily changes of Js of P.tabuliformis and H.rhamnoides showed a single peak during both pre-and postprecipitation.The Js of P.tabuliformis in growing season (12.62 mL · m-2 · s-1) was significantly higher than that of H.rhamnoides (2.60 mL · m-2 · s-1).The Js of these two species were significantly positively correlated with photosynthetic active radiation,vapor pressure deficit,soil volumetric water content (SWC).The Js of these two species were mainly influenced by meteorological factors during pre-and post-precipitation in both August and September.The contribution of SWC to Js of H.rhamnoides increased by 4.2％ after precipitation in September,but the contribution of SWC to Js of P.tabuliformis decreased by 0.3％ after precipitation in both August and September,respectively.Meanwhile,P.tabuliformis showed significantly higher water potential in midday leaf,but lower coefficient of variation (7.3％) than H.rhamnoides with the coefficient of variation of 11.7％.However,H.rhamnoides exhibited higher leaf stomatal conductance.Thus,P.tabuliformis and H.rhamnoides could be considered as isohydry and anisohydry species,respectively.关键词
液流密度/恒水型/变水型/油松/沙棘Key words
sap flow density/isohydry/anisohydry/Pinus tabuliformis/Hippophae rhamnoides引用本文复制引用
温杰,陈云明,唐亚坤,吴旭,谢育利,崔高阳..黄土丘陵区油松、沙棘生长旺盛期树干液流密度特征及其影响因素[J].应用生态学报,2017,28(3):763-771,9.基金项目
本文由国家自然科学基金项目(41501576,41371506)、公益性行业(国家气象局)科研专项(重大专项)(GYHY2015060013)、中央高校基本科研业务费专项(Z109021606)和国家重点研发计划项目(2016YFC0501703)资助 This work was supported by the National Natural Science Foundation of China(41501576,41371506),the China Special Fund for Meteorological Research in the Public Interest(Major Project)(GYHY2015060013),the Fundamental Research Funds for the Central Universities (Z109021606) and the National Key Research and Development Program of China (2016YFC0501703). （41501576,41371506）
