scholarly journals Alterations in flowering strategies and sexual allocation of Caragana stenophylla along a climatic aridity gradient

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Lina Xie ◽  
Hongyu Guo ◽  
Chengcang Ma
Keyword(s):  
Aridity Gradient ◽  
Climatic Aridity

Effects of Grazing on Population Growth Characteristics of Caragana stenophylla Along a Climatic Aridity Gradient

2018 ◽  
Vol 71 (1) ◽  
pp. 98-105 ◽  
Author(s):  
Li-Na Xie ◽  
Hong-Yu Guo ◽  
Wei-Zhong Chen ◽  
Zhe Liu ◽  
Song Gu ◽  
...  
Keyword(s):  
Population Growth ◽  
Growth Characteristics ◽  
Aridity Gradient ◽  
Climatic Aridity

scholarly journals Climatic Aridity Gradient Modulates the Diversity of the Rhizosphere and Endosphere Bacterial Microbiomes of Opuntia ficus-indica

2020 ◽  
Vol 11 ◽  
Author(s):  
Fatma Karray ◽  
Mahmoud Gargouri ◽  
Asma Chebaane ◽  
Najla Mhiri ◽  
Ahmed Mliki ◽  
...  
Keyword(s):  
Opuntia Ficus Indica ◽  
Aridity Gradient ◽  
Climatic Aridity

scholarly journals What drives the shift between sexual and clonal reproduction of Caragana stenophylla along a climatic aridity gradient?

2018 ◽  
Vol 18 (1) ◽  
Author(s):  
Zhongwu Wang ◽  
Lina Xie ◽  
Chelse M. Prather ◽  
Hongyu Guo ◽  
Guodong Han ◽  
...  
Keyword(s):  
Clonal Reproduction ◽  
Aridity Gradient ◽  
Climatic Aridity

scholarly journals Effects of grazing intensity on seed production of Caragana stenophylla along a climatic aridity gradient in the Inner Mongolia Steppe, China

2016 ◽  
Vol 8 (6) ◽  
pp. 890-898 ◽  
Author(s):  
Lina Xie ◽  
Weizhong Chen ◽  
Christopher A. Gabler ◽  
Lei Han ◽  
Hongyu Guo ◽  
...  
Keyword(s):  
Seed Production ◽  
Inner Mongolia ◽  
Grazing Intensity ◽  
Aridity Gradient ◽  
Climatic Aridity

scholarly journals Different climate sensitivity for radial growth, but uniform for tree-ring stable isotopes along an aridity gradient in Polylepis tarapacana, the world’s highest elevation tree-species

2021 ◽  
Author(s):  
Milagros Rodriguez-Caton ◽  
Laia Andreu-Hayles ◽  
Mariano S Morales ◽  
Valérie Daux ◽  
Duncan A Christie ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Carbon Source ◽  
Tree Ring ◽  
Tree Growth ◽  
Carbon Sink ◽  
Growing Season ◽  
Wood Formation ◽  
Aridity Gradient ◽  
Leaf Level ◽  
Δ13c And Δ18o

Abstract Tree growth is generally considered to be temperature-limited at upper elevation treelines. Yet, climate factors controlling tree growth at semiarid treelines are poorly understood. We explored the influence of climate on stem growth and stable isotopes for Polyepis tarapacana, the world’s highest elevation tree-species found only in the South American Altiplano. We developed tree-ring width index (RWI), oxygen (δ18O) and carbon (δ13C) chronologies for the last 60 years at four P. tarapacana stands located above 4,400 meters in elevation, along a 500-km latitude-aridity gradient. Total annual precipitation decreased from 300 to 200 mm from the northern to the southern sites. We used RWI as a proxy of wood formation (carbon sink) and isotopic tree-ring signatures as proxies of leaf-level gas exchange processes (carbon source). We found distinct climatic conditions regulating carbon-sink processes along the gradient. Current-growing season temperature regulated RWI at wetter-northern sites, while prior-growing season precipitation determined RWI at arid-southern sites. This suggests that the relative importance of temperature to precipitation in regulating tree growth is driven by site-water availability. In contrast, warm and dry growing-seasons resulted in enriched tree-ring δ13C and δ18O at all study sites, suggesting that similar climate conditions control carbon-source processes. Site-level δ13C and δ18O chronologies were significantly and positively related at all sites, with the strongest relationships among the southern-drier stands. This indicates an overall regulation of intercellular carbon dioxide via stomatal conductance for the entire P. tarapacana network, with greater stomatal control when aridity increases. The manuscript also highlights a coupling and decoupling of physiological processes at leaf level versus wood formation depending on their respectively uniform and distinct sensitivity to climate. This study contributes to better understand and predict the response of high-elevation Polylepis woodlands to rapid climate changes and projected drying in the Altiplano.

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