Contrasting adaptive strategies by Caragana korshinskii and Salix psammophila in a semiarid revegetated ecosystem
Contrasting adaptive strategies by Caragana korshinskii and Salix psammophila in a semiarid revegetated ecosystem
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半干旱植被恢复生态系统中锦鸡儿和沙柳的适应性策略对比
DOI：
10.1016/j.agrformet.2021.108323
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发表时间：
2021-04
影响因子：
6.2
通讯作者：
Wassen M
中科院分区：
文献类型：
--
作者：
Zhao Y;Wang L;Knighton J;Evaristo J;Wassen M
沙柳和柠条是黄土高原农田植被恢复的先锋树种。了解这两种植物的水分利用策略和生理特性，对于评价它们在水分有限生态系统中的适应性具有重要意义。利用稳定同位素（D和18 O）、生理参数（午间和黎明前叶水势和气孔导度（分别为δ 13 C、δ 13 D和δ 18 O））和叶片δ 13 C分别分析了这两种灌木的水分来源、等水/异水行为和水分利用效率（WUE）。结果表明，S.在干旱期（5 ~ 6月），沙生植物主要依靠中间土层（距地表30-80 cm）的水分（平均60%），而C.柠条对深层（80-100 cm）水分的依赖程度平均为52%。在湿润期（7月和8月），两个物种都从0-30 cm的浅层（0-30 cm）开始利用水分（平均61%）。psammophilia和C. korshinskii）。这些根系吸水模式与C. korshinskii的生理表现，这与C. korshinskii是一个非等水性物种，其特征是：korshinskii的δ md与δ pd的关系斜率（σ，1.88）较陡，δ md与δ pd的差值（Δ σ，-1.66 ± 0.10 MPa）较大。相反，S.亲沙岩属等水型（σ = 0.82，Δ σ =-0.77 ± 0.02MPa）。令人惊讶的是，尽管是非等氢的，C.长期水分利用效率，柠条高于等水小麦。尤其是在旱季。与水分有效性相比，这些结果表明，C. korshinskii可能比S.沙生植物本研究可作为评价灌木物种持续性与生态系统管理和恢复的参考。
Salix psammophilaandCaragana korshinskiiare pioneer species used for revegetating farmlands on the Loess Plateau. Understanding the water-use strategies and physiological characteristics of these two species are important for evaluating their adaptability in water-limited ecosystems. We used stable isotopes (D and18O), physiological parameters (e.g. midday and predawn leaf water potential and stomatal conductance (ψmd, ψpdand gs, respectively)) and foliar δ13C to analyse water sources, isohydric/anisohydric behaviour, and water-use efficiency (WUE), respectively, of these two shrub species. Our results show thatS. psammophilarelied on water (mean 60%) from the intermediate soil layer (30-80 cm from the surface) during the dry period (May and June), whileC. korshinskiirelied on water from the deep soil layer (80-100 cm) (mean 52%). Both species shifted to using water from the shallow layer (0-30 cm) during the wet period (July and August) (mean 61% forS. psammophilaand 51% forC. korshinskii). These root water uptake patterns are consistent withC. korshinskii’s physiological performance, which in turn is consistent with a description thatC. korshinskiiis an anisohydric species as evidenced by a steeper slope of the relationship between ψmdand ψpd(σ, 1.88), and a larger difference between ψmdand ψpd(Δψ, -1.66 ± 0.10 MPa). In contrast,S. psammophilacould be described as an isohydric species (0.82 for σ and -0.77 ± 0.02 MPa for Δψ). Surprisingly, despite being anisohydric,C. korshinskishowed greater long-term WUE than isohydricS. psammophila, particularly during the dry season. Insofar as water availability is concerned, these results show that the environmental adaptability ofC. korshinskiimay generally be more ecologically plastic than that ofS. psammophila. Our study serves as a reference for evaluating the persistence of shrub species in relation to the management and restoration of ecosystems.
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影响因子：
3.7
作者：
Parnell AC;Inger R;Bearhop S;Jackson AL
通讯作者：
Jackson AL
影响因子：
3.2
作者：
Evaristo, Jaivime;McDonnell, Jeffrey J.;Clemens, John
通讯作者：
Clemens, John
DOI：
10.1016/j.agee.2019.106790
发表时间：
2020-04
期刊：
Agriculture, Ecosystems & Environment
影响因子：
--
作者：
D. Penna;J. Geris;L. Hopp;F. Scandellari
通讯作者：
D. Penna;J. Geris;L. Hopp;F. Scandellari
影响因子：
4
作者：
M. G. Ryan
通讯作者：
M. G. Ryan
腾格里沙漠东南缘沙坡头人工固沙植被植物水分利用策略
影响因子：
2.5
作者：
Zhao Liang-ju;Wang Xiao-gang;Zhang Yu-cui;Xie Cong;Liu Quan-yu;Meng Fei
通讯作者：
Meng Fei