Some observations of the adaptations of sandy shrubs to the arid environment in the Mu Us Sandland: leaf water relations and anatomic features

Dong, Xuejun; Zhang, Xinshi

doi:10.1006/jare.2000.0700

Cited by 57 publications

(51 citation statements)

References 11 publications

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“…III). However, similar values of ε were also observed in well-watered plants measured in April, indicating that this increment in ε was not due to irrigation treatment as was also reported in other species [3,23].…”

Section: Experiments 1: Hydraulic Resistancesupporting

confidence: 86%

“…[19]). Drought avoider species may be classified as "water spenders" or "water savers", depending on their water use [3,15]. These authors enumerate the following physiological characteristics as typical of water saver compared to water spender species: (1) lower osmotic potential; (2) more rigid cell walls (higher modulus elasticity); (3) less vulnerability to xylem cavitation: and (4) stronger stomatal control over transpirational water loss.…”

Section: Introductionmentioning

confidence: 99%

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Leaf and whole-plant water relations of the Patagonian conifer Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri: implications on its drought resistance capacity

et al. 2005

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-Physiological studies have suggested that A. chilensis would survive during drought avoiding water stress through an early stomatal closure. However, there are no studies that have explored other potential mechanisms related to drought resistance or avoidance. The objectives were: (1) to measure hydraulic resistance, vulnerability to cavitation and leaf water relations, and (2) to compare these characteristics between different provenances. Pressure-volume curves demonstrate that A. chilensis has high osmotic potentials at full turgor, high water potentials at turgor loss point, low modulus of elasticity, and did not present elastic or osmotic adjustments after drought. Compared to other gymnosperms, A. chilensis has a high total plant resistance but also a high vulnerability to cavitation. We found no differences between the studied provenances in these variables. Our results confirm that A. chilensis is a drought-avoidance species, and suggest that phenotypic morphological differentiation between populations allows the species to survive throughout its broad distribution.pressure-volume curves / xylem cavitation / stomatal conductance / drought avoidance / water stress Résumé -Relations hydriques au niveau de la feuille et du plant chez un conifère de Patagonie Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri: implications pour sa capacité à résister à la sécheresse. Des études physiologiques suggèrent que l'Austrocedrus chilensis peut survivre aux périodes de sécheresse évitant le stress hydrique grâce à une fermeture stomatique précoce. Cependant, il n'y a pas d'étude qui eut exploré d'autres mécanismes potentiels liés à la résistance ou à l'évitement de la sécheresse. Les objectifs de ce travail ont été : (1) mesurer la résistance hydraulique, la vulnérabilité à la cavitation et les relations hydriques des feuilles et (2) comparer ces caractéristiques avec celles des populations de différentes provenances. Les courbes pression-volume ont démontré que l'Austrocedrus chilensis possède un potentiel osmotique élevé à pleine turgescence, un potentiel hydrique au point de perte de turgescence, un module d'élasticité bas et qu'il ne présente pas de réglage élastique ou osmotique après la sécheresse. En comparaison avec d'autres gymnospermes, l'Austrocedrus chilensis a une résistance totale élevée mais aussi une importantee vulnérabilité à la cavitation. Nous n'avons pas trouvé de différences significatives entre les provenances étudiées dans ces variables. Nos résultats confirment que l'Austrocedrus chilensis est une espèce qui évite la sécheresse, et ils suggèrent que les changements phénotypiques entre populations permettent à cette espèce de survivre dans sa vaste distribution. courbes pression-volume / cavitation du xylème / conductance stomatique / évitement de la sécheresse / tension hydrique

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Section: Experiments 1: Hydraulic Resistancesupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Leaf and whole-plant water relations of the Patagonian conifer Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri: implications on its drought resistance capacity

et al. 2005

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“…available moisture in dryland ecosystems (Dunkerley, 2000;Yang, 2010;Návar, 2011;Li et al, 2013). That agreed with the findings of Dong and Zhang (2001) that S. psammophila belonged to the water-spending paradigm from the aspect of leaf water relations and anatomic features, and the finding of Ai et al (2015) that C. korshinskii belonged to the watersaving paradigm and had larger drought tolerance ability than S. psammophila from the aspect of root anatomical structure and hydraulic traits.…”

Section: Effects Of Precipitation Threshold To Produce Stemflowsupporting

confidence: 83%

Comparisons of stemflow and its bio-/abiotic influential factors between two xerophytic shrub species

Yuan

Gao

2017

Hydrol. Earth Syst. Sci.

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Abstract. Stemflow transports nutrient-enriched precipitation to the rhizosphere and functions as an efficient terrestrial flux in water-stressed ecosystems. However, its ecological significance has generally been underestimated because it is relatively limited in amount, and the biotic mechanisms that affect it have not been thoroughly studied at the leaf scale. This study was conducted during the 2014 and 2015 rainy seasons at the northern Loess Plateau of China. We measured the branch stemflow volume (SF b ), shrub stemflow equivalent water depth (SF d ), stemflow percentage of incident precipitation (SF %), stemflow productivity (SFP), funnelling ratio (FR), the meteorological characteristics and the plant traits of branches and leaves of C. korshinskii and S. psammophila. This study evaluated stemflow efficiency for the first time with the combined results of SFP and FR, and sought to determine the inter-and intra-specific differences of stemflow yield and efficiency between the two species, as well as the specific bio-/abiotic mechanisms that affected stemflow. The results indicated that C. korshinskii had a greater stemflow yield and efficiency at all precipitation levels than that of S. psammophila. The largest inter-specific difference generally occurred at the 5-10 mm branches during rains of ≤ 2 mm. Precipitation amount was the most influential meteorological characteristic that affected stemflow yield and efficiency in these two endemic shrub species. Branch angle was the most influential plant trait on FR. For SF b , stem biomass and leaf biomass were the most influential plant traits for C. korshinskii and S. psammophila, respectively. For SFP of these two shrub species, leaf traits (the individual leaf area) and branch traits (branch size and biomass allocation pattern) had a great influence during lighter rains ≤ 10 mm and heavier rains > 15 mm, respectively. The lower precipitation threshold to start stemflow allowed C. korshinskii (0.9 mm vs. 2.1 mm for S. psammophila) to employ more rains to harvest water via stemflow. The beneficial leaf traits (e.g., leaf shape, arrangement, area, amount) might partly explain the greater stemflow production of C. korshinskii. Comparison of SF b between the foliated and manually defoliated shrubs during the 2015 rainy season indicated that the newly exposed branch surface at the defoliated period and the resulting rainfall intercepting effects might be an important mechanism affecting stemflow in the dormant season.

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“…The area covers only 40 000 km 2 (Dong and Zhang, 2001) and is ecologically fragile (Yang et al, 2007). In such an ecosystem, sand dunes and BSCs are commonly observed (Gao et al, 2014;Yang et al, 2015;Li and Li, 2000;Liu, 2012).…”

mentioning

confidence: 99%

Monitoring the variations of evapotranspiration due to land use/cover change in a semiarid shrubland

Gong

Lei

Yang

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Evapotranspiration (E T ) is an important process in the hydrological cycle, and vegetation change is a primary factor that affects E T . In this study, we analyzed the annual and inter-annual characteristics of E T using continuous observation data from eddy covariance (EC) measurement over 4 years (1 July 2011 to 30 June 2015) in a semiarid shrubland of Mu Us Sandy Land, China. The Normalized Difference Vegetation Index (NDVI) was demonstrated as the predominant factor that influences the seasonal variations in E T . Additionally, during the land degradation and vegetation rehabilitation processes, E T and normalized E T both increased due to the integrated effects of the changes in vegetation type, topography, and soil surface characteristics. This study could improve our understanding of the effects of land use/cover change on E T in the fragile ecosystem of semiarid regions and provide a scientific reference for the sustainable management of regional land and water resources.

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Some observations of the adaptations of sandy shrubs to the arid environment in the Mu Us Sandland: leaf water relations and anatomic features

Cited by 57 publications

References 11 publications

Leaf and whole-plant water relations of the Patagonian conifer Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri: implications on its drought resistance capacity

Leaf and whole-plant water relations of the Patagonian conifer Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri: implications on its drought resistance capacity

Comparisons of stemflow and its bio-/abiotic influential factors between two xerophytic shrub species

Monitoring the variations of evapotranspiration due to land use/cover change in a semiarid shrubland

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