Elevation-dependent variations of tree growth and intrinsic water-use efficiency in schrenk spruce (picea schrenkiana) in the western tianshan mountains, china
文献类型：期刊论文
| 作者 | Wu, Guoju1,2; Liu, Xiaohong1; Chen, Tuo1; Xu, Guobao1; Wang, Wenzhi1,2; Zeng, Xiaomin1,2; Zhang, Xuanwen1,2 |
| 刊名 | Frontiers in plant science
 |
| 出版日期 | 2015-05-06 |
| 卷号 | 6页码:12 |
| 关键词 | Tree rings Basal area increment Carbon isotope Spei Elevation gradient Physiological response Northwestern china |
| ISSN号 | 1664-462X |
| DOI | 10.3389/fpls.2015.00309 |
| 通讯作者 | Liu, xiaohong(liuxh@lzb.ac.cn) |
| 英文摘要 | Rising atmospheric co2 concentration (c-a) is expected to accelerate tree growth by enhancing photosynthesis and increasing intrinsic water-use efficiency (iwue). however, the extent of this effect on long-term iwue and its interactions with climate remains unclear in trees along an elevation gradient. therefore, we investigated the variation in the radial growth and iwue of mature picea schrenkiana trees located in the upper tree-line (a1 : 2700 m a.s.l.), middle elevation (a2 : 2400 m a.s.l.), and lower forest limit (a3 : 2200 m a.s.l.), in relation to the rising ca and changing climate in the wusun mountains of northwestern china, based on the basal area increment (bai) and tree-ring delta c-13 chronologies from 1960 to 2010. we used the cru ts3.22 dataset to analyze the general response of tree growth to interannual variability of regional climate, and found that bai and delta c-13 are less sensitive to climate at a1 than at a2 and a3. the temporal trends of iwue were calculated under three theoretical scenarios, as a baseline for interpreting the observed gas exchange at increasing ca. we found that iwue increased by 12-32% from a1 to a3 over the last 50 years, and showed an elevation-dependent variation in physiological response. the significant negative relationship between bai and iwue at a2 and a3 showed that tree growth has been decreasing despite long-term increases in iwue. however, bai remained largely stable throughout the study period despite the strongest iwue increase [at constant intercellular co2 concentration (c-i) before 1980] at al. our results indicate a drought-induced limitation of tree growth response to rising co2 at lower elevations, and no apparent change in tree growth and diminished iwue improvement since 1980 in the upper tree-line. this study may contradict the expectation that combined effects of elevated ca and rising temperatures have increased forest productivity, especially in high-elevation forests. |
| WOS关键词 | CARBON-ISOTOPE DISCRIMINATION ; ATMOSPHERIC CO2 ; CLIMATE-CHANGE ; NORTHWESTERN CHINA ; NORTHERN FINLAND ; FAGUS-SYLVATICA ; RING DELTA-C-13 ; STABLE-ISOTOPES ; SOIL-MOISTURE ; NORWAY SPRUCE |
| WOS研究方向 | Plant Sciences |
| WOS类目 | Plant Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000356900800002 |
| 出版者 | FRONTIERS RESEARCH FOUNDATION |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2376378 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Liu, Xiaohong |
| 作者单位 | 1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Guoju,Liu, Xiaohong,Chen, Tuo,et al. Elevation-dependent variations of tree growth and intrinsic water-use efficiency in schrenk spruce (picea schrenkiana) in the western tianshan mountains, china[J]. Frontiers in plant science,2015,6:12. |
| APA | Wu, Guoju.,Liu, Xiaohong.,Chen, Tuo.,Xu, Guobao.,Wang, Wenzhi.,...&Zhang, Xuanwen.(2015).Elevation-dependent variations of tree growth and intrinsic water-use efficiency in schrenk spruce (picea schrenkiana) in the western tianshan mountains, china.Frontiers in plant science,6,12. |
| MLA | Wu, Guoju,et al."Elevation-dependent variations of tree growth and intrinsic water-use efficiency in schrenk spruce (picea schrenkiana) in the western tianshan mountains, china".Frontiers in plant science 6(2015):12. |
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来源：中国科学院大学
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