scholarly journals Tree growth and intrinsic water-use efficiency of inland riparian forests in northwestern China: evaluation via  13C and  18O analysis of tree rings

2014 ◽  
Vol 34 (9) ◽  
pp. 966-980 ◽  
Author(s):  
X. Liu ◽  
W. Wang ◽  
G. Xu ◽  
X. Zeng ◽  
G. Wu ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Tree Rings ◽  
Tree Growth ◽  
Riparian Forests ◽  
Northwestern China ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency

Increased drought and atmospheric CO2 positively impact intrinsic water use efficiency but do not promote tree growth in semi-arid areas of northwestern China

Trees ◽  
2019 ◽  
Vol 33 (3) ◽  
pp. 669-679 ◽  
Author(s):  
Kanglong Lu ◽  
Ning Chen ◽  
Xiaowei Zhang ◽  
Jingru Wang ◽  
Minghao Wang ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Tree Growth ◽  
Atmospheric Co2 ◽  
Northwestern China ◽  
Arid Areas ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency ◽  
Semi Arid

Increasing intrinsic water-use efficiency over the past 160 years does not stimulate tree growth in southeastern China

2018 ◽  
Vol 76 (2) ◽  
pp. 115-130 ◽  
Author(s):  
G Guo ◽  
K Fang ◽  
J Li ◽  
HW Linderholm ◽  
D Li ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Tree Growth ◽  
Southeastern China ◽  
The Past ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency

scholarly journals Drought Enhances the Role of Competition in Mediating the Relationship between Tree Growth and Climate in Semi-Arid Areas of Northwest China

Forests ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 804 ◽  
Author(s):  
Kanglong Lu ◽  
Ning Chen ◽  
Cankun Zhang ◽  
Xiaoxue Dong ◽  
Changming Zhao
Keyword(s):  
Climate Variability ◽  
Water Use Efficiency ◽  
Water Use ◽  
Tree Growth ◽  
Radial Growth ◽  
Intrinsic Water Use Efficiency ◽  
Adverse Weather ◽  
Significant Difference ◽  
Use Efficiency ◽  
The Relationship

Climate variability can exert a powerful impact on biotic competition, but past studies have focused largely on short-lived species, with a lack of attention to long-lived species such as trees. Therefore, there is a need to evaluate how competition regulates the climate-growth relationship in mature trees. We sampled the dominant tree species, Picea wilsonii Mast., on Xinglong Mountain, China, and studied the above issues by analyzing the relationship between tree radial growth, precipitation, and competition. In relatively wet years (precipitation > average), there was no significant difference in climate sensitivity between different competition classes. However, trees suffering from highly competitive stress were more sensitive to climate variability in all years, and particularly in the subset of years that was relatively drought (precipitation < average). These results suggest that competition enhances its ability to regulate tree growth response to climate variability in adverse weather conditions. Competition for resources between trees was asymmetrical, and an increase in height could give trees a disproportionate benefit. Thus, at trunk-level, both basal area incremental growth and intrinsic water-use efficiency of trees subjected to low competitive stress were significantly higher than trees that are subjected to highly competitive stress. Although the intrinsic water-use efficiency of trees under highly competitive stress increased more rapidly as the drought level increases, this did not change the fact that the radial growth of them declined more. Our research is valuable for the development of individual-tree growth models and advances our understanding for forest management under global climate change.

scholarly journals Disentangling Contributions of CO2 Concentration and Climate to Changes in Intrinsic Water-Use Efficiency in the Arid Boreal Forest in China’s Altay Mountains

Forests ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 642 ◽  
Author(s):  
Guobao Xu ◽  
Xiaohong Liu ◽  
Soumaya Belmecheri ◽  
Tuo Chen ◽  
Guoju Wu ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Water Use Efficiency ◽  
Water Use ◽  
Tree Growth ◽  
Co2 Concentration ◽  
Optimization Approach ◽  
The Past ◽  
Altay Mountains ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency

Intrinsic water-use efficiency (iWUE) is affected by the balance of photosynthetic rate, stomatal conductance, and climate, along with many other exogenous factors, such as the CO2 concentration in the atmosphere (CO2atm), nutrients, and water holding capacity of the soil. The relative contributions of CO2atm and climate to iWUE are still incompletely understood, particularly for boreal forests where the climate is undergoing unprecedented warming. We combined δ13C and δ18O in tree rings from the Siberian larch (Larix sibirica Ledeb.) in Northwestern China’s Altay Mountains, which receives 190 mm in annual precipitation, to detect the drivers of long-term iWUE changes and their time-varying contributions over the past 222 years. A climate optimization approach was used to isolate the influence of climate from CO2atm influence on iWUE. We found that iWUE increased about 33.6% from 1790 to 2011, and rising CO2atm contributed 48.8% to this iWUE increase. The contributions of CO2atm and climate (drought conditions) varied during the study period 1790–2011. From 1790 to 1876, the climate was the most important factor contributing to the changes in iWUE. From 1877 to 1972, CO2atm was the main contributor; however, after 1973, the climate was again the dominant contributor to the increase in iWUE, especially during 1996–2011. During the period 1996–2011, climate substantially (83%) contributed to the iWUE increase. Our findings imply that, in the boreal forest in Northwestern China’s arid region, iWUE experienced three changes: (1) the climate dominating from 1790 to 1876; (2) CO2atm dominating from 1877 to 1972, and (3) climate dominating again during the past four decades. We observed that the relationships between iWUE and tree-ring width shifted from positive to negative from 1996 onwards. These relationship changes indicate that CO2atm-mediated effects of increasing iWUE on tree growth are counteracted by climatic drought stress and iWUE increase cannot counter the stress from drought on tree growth in China’s arid boreal forest.

scholarly journals Responses of Intrinsic Water-use Efficiency and Tree Growth to Climate Change in Semi-Arid Areas of North China

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
L. U. Weiwei ◽  
Y. U. Xinxiao ◽  
J. I. A. Guodong ◽  
L. I. Hanzhi ◽  
L. I. U. Ziqiang
Keyword(s):  
Climate Change ◽  
Water Use Efficiency ◽  
Water Use ◽  
Tree Growth ◽  
North China ◽  
Arid Areas ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency ◽  
Semi Arid

Trends in tree growth and intrinsic water-use efficiency in the tropics under elevated CO2 and climate change

Trees ◽  
2019 ◽  
Vol 33 (3) ◽  
pp. 623-640 ◽  
Author(s):  
Mizanur Rahman ◽  
Mahmuda Islam ◽  
Aster Gebrekirstos ◽  
Achim Bräuning
Keyword(s):  
Climate Change ◽  
Water Use Efficiency ◽  
Elevated Co2 ◽  
Water Use ◽  
Tree Growth ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency ◽  
The Tropics
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