scholarly journals Regeneration properties of a Populus euphratica riparian forest located in the vicinity of the Ejina Oasis, Inner Mongolia, China

2016 ◽  
Vol 13 (1) ◽  
pp. 71-79 ◽  
Author(s):  
X. Li ◽  
Y. Li ◽  
G. Zhang ◽  
L. Wang ◽  
K. Yoshikawa
Keyword(s):  
Inner Mongolia ◽  
Riparian Forest ◽  
Populus Euphratica ◽  
Ejina Oasis

Seasonal Trade-Off between Water- and Nitrogen-Use Efficiency of Constructive Plants in Desert Riparian Forest in Hyperarid Region of China

2011 ◽  
pp. 260-275
Author(s):  
Shengkui Cao ◽  
Qi Feng ◽  
Jianhua Si ◽  
Yonghong Su ◽  
Zongqiang Chang ◽  
...  
Keyword(s):  
Nitrogen Use Efficiency ◽  
Riparian Forest ◽  
Seasonal Pattern ◽  
Nitrogen Concentration ◽  
Populus Euphratica ◽  
Nitrogen Use ◽  
Trade Off ◽  
N Concentration ◽  
Use Efficiency

Foliar d13C values are often used to denote the long-term water use efficiency (WUE) of plants whereas long-term nitrogen use efficiency (NUE) are usually estimated by the ratio of C to N in the leaves. Seasonal variations of d13C values, foliar nitrogen concentration and C/N ratios of Populus euphratica and Tamarix ramosissima grown under five different microhabitats of Ejina desert riparian oasis of northwestern arid regions in China were studied. The results indicated that T. ramosissima had higher d13C value compared with that of P. euphratica. The N concentration and C/N ratios of two species were not significantly different. The seasonal pattern of three indexes in two species was different. The d13C values and N concentration decreased during the plant’s growth period. However, the change of C/N ratios was increased. Among microhabitats, there were higher d13C values and N concentration as well as lower C/N ratios in the Dune and Gobi habitats. Foliar d13C values significantly and positively correlated with N concentration in P. euphratica and T. ramosissima, whereas a significantly negative correlation between d13C values and C/N ratios was found for P. euphratica. This relation in T. ramosissima was weak, but there was a significant quadratic curve relationship between d13C values and C/N ratios, which revealed that there was a trade-off between WUE and NUE for P. euphratica and in natural condition, P. euphratica could not improve WUE and NUE simultaneously. T. ramosissima could simultaneously enhance WUE and NUE. The above characters of WUE and NUE in two plants reflected the different adaptations of desert species to environmental condition.

Influence of river hydrological change on the characteristics of canopy gaps and gap makers of Populus euphratica desert riparian forest

2019 ◽  
Vol 39 (17) ◽  
Author(s):  
阿依加马力·克然木 Ayjamal Keram ◽  
玉米提·哈力克 Vmüt Halik ◽  
塔依尔江·艾山 Tayierjiang Aishan ◽  
买尔当·克依木 Maierdang Keyimu ◽  
祖皮艳木·买买提 Zulpiya Mamat ◽  
...  
Keyword(s):  
Riparian Forest ◽  
Populus Euphratica ◽  
Canopy Gaps ◽  
Hydrological Change ◽  
Desert Riparian Forest

Root Water Uptake Model of Populus Euphratica in Desert Riparian Forest in Extreme Arid Region

2011 ◽  
pp. 276-288
Author(s):  
Yongzheng Tian ◽  
Jianhua Si ◽  
Qi Feng ◽  
Shengkui Cao
Keyword(s):  
Water Absorption ◽  
Soil Water ◽  
Arid Region ◽  
Water Movement ◽  
Root Zone ◽  
Riparian Forest ◽  
Plant Root ◽  
Populus Euphratica ◽  
Root Water Uptake ◽  
Plant Root System

Plant root water uptake is a key way to transfer soil water to the atmosphere. It is an important part of the research on water transforming patterns in the SPAC (Soil-Plant-Air Continuum). So understanding the water absorption patterns of plant root system is a base to recognize the SPAC. Recently there are many studies on the water absorption patterns of plant root system. However, the researched plants are mostly crops and the main researched areas are regions with adequate precipitation. There are only a few studies on the water absorption of natural plants in extreme arid desert regions. This paper studied the root water absorption patterns of Populus euphratica and established the corresponding mathematical model based on the data of root density and soil water dynamics in root zone in desert riparian forest in extreme arid region. The finite difference method was used to discretize the soil water movement equation with evaporation boundary conditions. Numerical simulation analysis of soil water movement in root zone of Populus euphratica showed that the simulated values were consistent with the measurement values with 92-98% precision. This work provides a theoretical basis for the study of water movement in the SPAC.

Response of Populus euphratica communities in a desert riparian forest to the groundwater level gradient in the Tarim Basin

2017 ◽  
Vol 37 (20) ◽  
Author(s):  
韩路 HAN Lu ◽  
王海珍 WANG Haizhen ◽  
牛建龙 NIU Jianlong ◽  
王家强 WANG Jiaqiang ◽  
柳维扬 LIU Weiyang
Keyword(s):  
Tarim Basin ◽  
Groundwater Level ◽  
Riparian Forest ◽  
Populus Euphratica ◽  
Desert Riparian Forest

scholarly journals Hydraulic Characteristics of Populus euphratica in an Arid Environment

Forests ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 407 ◽  
Author(s):  
Duan Li ◽  
Jianhua Si ◽  
Xiaoyou Zhang ◽  
Yayu Gao ◽  
Chunlin Wang ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Water Transport ◽  
Riparian Forest ◽  
Populus Euphratica ◽  
Hydraulic Conductance ◽  
Drought Severity ◽  
Severe Drought ◽  
Hydraulic Characteristics ◽  
Healthy Tree ◽  
Tree Crowns

Stable hydraulic conductivity in forest trees maintains healthy tree crowns and contributes to productivity in forest ecosystems. Drought conditions break down this relationship, but the mechanisms are poorly known and may depend on drought severity. To increase the understanding of changes in hydraulic conductivity during drought, we determined hydraulic parameters in Populus euphratica Oliv. (P. euphratica) in naturally arid conditions and in a simulated severe drought using a high-pressure flow meter. The results showed that leaf-specific hydraulic conductance (LSC) of leaf blades was less variable in mild drought, and increased significantly in severe drought. Plants attempted to maintain stability in leaf blade LSC under moderate water stress. In extreme drought, LSC was enhanced by increasing hydraulic conductance in plant parts with less hydraulic limitation, decreasing it in other parts, and decreasing leaf area; this mechanism protected the integrity of water transport in portions of tree crowns, and induced scorched branches and partial mortality in other parts of crowns. We conclude that limitation in water supply and elastic regulation of hydraulic characteristics may drive the mortality of tree branches as a result of severe drought. Evaluation of adaptive water transport capacity in riparian plants in arid areas provides a scientific basis for riparian forest restoration.

Oasis landscape of the ancient Loulan on the west bank of Lake Lop Nur, Northwest China, inferred from vegetation utilization for architecture

The Holocene ◽  
2019 ◽  
Vol 29 (6) ◽  
pp. 1030-1044 ◽  
Author(s):  
Kangkang Li ◽  
Xiaoguang Qin ◽  
Lei Zhang ◽  
Shuzhi Wang ◽  
Bing Xu ◽  
...  
Keyword(s):  
Building Materials ◽  
Riparian Forest ◽  
West Bank ◽  
Populus Euphratica ◽  
Northwest China ◽  
Silk Road ◽  
Forest Growth ◽  
Human Interaction ◽  
The West ◽  
Lop Nur

The ancient Loulan, situated on the west bank of Lake Lop Nur, Xinjiang, Northwest China, was an important town on the Silk Road connecting China to Europe. However, this once-prosperous kingdom has been a depopulated zone filled with wind-eroded mounds since approximately AD 500–600. A comprehensive understanding of the environmental setting of the flourishing Loulan civilization is a prerequisite for assessing environment–human interaction there. Here, we present our survey, chronology, and archaeobotany (the identification of plant remains) of vegetation use for architecture from eight ancient ruins of the Loulan kingdom to clarify the ecological landscape on the west bank of Lake Lop Nur and to assess paleoenvironmental conditions when the Loulan kingdom flourished. Our results suggest that Populus euphratica, tamarisk ( Tamarix Linn), and reed ( Phragmites Trin.) were most widely used as building materials in this period. Wood utilization for buildings depended entirely on indigenous vegetation rather than that of the mountains in the Loulan kingdom, even though the Loulan was a predominant transportation hub on the prosperous Silk Road. Our reconstruction indicates that the west bank of Lake Lop Nur was sufficiently wetter than present conditions to support riparian forest growth composed mainly of P. euphratica, tamarisk shrubs, and reed meadows, until approximately AD 500. These wetter conditions and flourishing civilization accompanied an increase in precipitation in arid central Asia. Conversely, combined evidence of both archeological and paleoclimatic records from the water sources of Lake Lop Nur and ancient oases suggest that abrupt decreased mountain precipitation could be considered a significant environmental factor in the decline of Loulan kingdom.

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