Sap flow of black locust in response to environmental factors in two soils developed from different parent materials in the lithoid mountainous area of North China

Trees ◽  
2018 ◽  
Vol 32 (3) ◽  
pp. 675-688 ◽  
Author(s):  
Yuanzhi Wu ◽  
Yongkun Zhang ◽  
Juan An ◽  
Qianjin Liu ◽  
Ying Lang
Keyword(s):  
Environmental Factors ◽  
Sap Flow ◽  
North China ◽  
Black Locust ◽  
Mountainous Area ◽  
Parent Materials

Slope runoff study in situ using rainfall simulator in mountainous area of North China

2009 ◽  
Vol 19 (4) ◽  
pp. 461-470 ◽  
Author(s):  
Jingjie Yu ◽  
Cong Yang ◽  
Changming Liu ◽  
Xianfang Song ◽  
Shanshan Hu ◽  
...  
Keyword(s):  
North China ◽  
Mountainous Area ◽  
Rainfall Simulator ◽  
Slope Runoff

scholarly journals Spectral parameters of Robinia pseudoacacia L. seeds in technogenic conditions of urban environment

2021 ◽  
Vol 32 (1) ◽  
pp. 35-40
Author(s):  
V. S. Fedenko
Keyword(s):  
Environmental Factors ◽  
Seed Coat ◽  
Barrier Function ◽  
Black Locust ◽  
Robinia Pseudoacacia ◽  
Technogenic Pollution ◽  
Seed Productivity ◽  
Invasive Potential ◽  
Alien Flora ◽  
Robinia Pseudoacacia L

Robinia pseudoacacia L. (black locust) is an invasive species with high activity in alien flora of Ukraine. Invasive potential of plants in unfavorable ecological conditions is due to the presence of adaptive mechanisms. One of the criteria for the invasive potential of foreign plants is considered to be seed productivity. For plants of black locust note a high level of seed productivity. However, it remains to be seen what factors ensure the formation of viable seeds in extreme environments. Among the factors that ensure the formation of viable plant seeds, note the barrier function of the seed coat relative to biotic and abiotic environmental factors. The physiological role of this protective barrier is realized due to the specific properties and component composition of the surface tissues of seeds. Among the metabolites with protective properties localized in the seed coat, consider proanthocyanidins (condensed tannins), which are formed during the biosynthesis of phenolic compounds. To objectively assess changes in the accumulation of proanthocyanidins in the seed coat, it is necessary to use non-destructive methods, because the isolation of these compounds destroys their native polymer structure. The influence of technogenic pollution of Dnipro city on the reflectance, colorimetric and fluorescent characteristics of Robinia pseudoacacia L. seeds is investigated in the work. Mature seeds of black locust were collected at monitoring sites in the Botanical Garden of Oles Honchar Dnipro National University (ecologically favorable zone) and at some points of linear roadside plantations of one of the main highways. It was found that the chronic effect of aerogenic pollutants on black locust plants caused an increased accumulation of proanthocyanidins in the seed coat, which may be due to changes in the biosynthesis of these compounds at the stage of oxidative polymerization of flavonoid subunits. Markers of this reaction of plants are the change of position and increase of intensity of maxima in the reflectance spectra of visible region, increase of value of dominant wavelength, decrease of conditional purity of color tone and colorimetric coefficients, increase of intensity of maxima in seed fluorescence spectra. The protective effect of these adaptive changes is associated with the strengthening of the barrier function of the seed coat to adverse environmental factors to maintain the viability of the seeds under the negative impact of technogenic pollution.

scholarly journals The relationship between sap flow density and environmental factors in the Yangtze River Delta region

2016 ◽  
Author(s):  
Xin Liu ◽  
Bo Zhang ◽  
Donald L DeAngelis ◽  
Jinchi Zhang ◽  
Jiayao Zhuang ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Sap Flow ◽  
Yangtze River ◽  
Meteorological Data ◽  
Growth Period ◽  
Yangtze River Delta ◽  
Flow Density ◽  
Yangtze River Delta Region ◽  
Sap Flow Density ◽  
The Yangtze River Delta

Transpiration is an important component of the water balance in forest ecosystems. Quercus acutissima and Cunninghamia lanceolata are two important, fast-growing and commercial tree species that have been extensively used for vegetation restoration, water conservation and building artificial forests in the Yangtze River Delta Region of China. The primary objective of this study was to characterize sap flow densities of the two species by comparing diurnal, nocturnal and seasonal sap flow patterns and their relationships with environmental factors. Sap flow densities (Sd) were measured between September 2012 and August 2013 using the commercially-available thermal dissipation probes. Hourly meteorological data were measured in an open field, located 200 m away from the study site. Standard meteorological data were logged hourly at this site, including photosynthetically active radiation (Par), air temperature (Ta), relative air humidity (Rh), vapor pressure deficit (Vpd) and precipitation (P). Soil water content (Swc) data were logged hourly in different layers at Q.acutissima and C.lanceolata forests. Results indicated that the mean Sd in summer was higher than that in spring and autumn, and was lowest in winter. The Sd of Q. acutissima showed distinct diurnal patterns during the growth period (between May and October), and C. lanceolata followed similar sap flow patterns in all months except February. Nocturnal sap flow densities (Sdn) were noticeable and both species followed similar patterns during the growth period, in which Q. acutissima followed a power function from April to November and C. lanceolata followed similar patterns in all months except February. Pearson correlation analysis suggested that the sap flow density responded to environmental factors differently among each of the growing stages. The diurnal sap flow density (Sdd) was more sensitive to environmental factors than Sdn. The Sd during the growth period was more sensitive to environmental factors than in the dormant period. Par, Vpd and Ta were significantly correlated with Sdd in the whole year. In the nighttime, the sap flow density was also effected by the Vpd, Ta and Rh. The results of this study can be used to estimate the transpiration of Q. acutissima and C. lanceolata.

scholarly journals Robust Estimation of Absorbing Root Surface Distributions From Xylem Water Isotope Compositions With an Inverse Plant Hydraulic Model

2021 ◽  
Vol 4 ◽  
Author(s):  
Hannes P. T. De Deurwaerder ◽  
Marco D. Visser ◽  
Félicien Meunier ◽  
Matteo Detto ◽  
Pedro Hervé-Fernández ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Soil Water ◽  
Robust Estimation ◽  
Inverse Modeling ◽  
Sap Flow ◽  
Soil Water Potential ◽  
Modeling Method ◽  
Flow Monitoring ◽  
Root Surfaces ◽  
Water Isotope

The vertical distribution of absorbing roots is one of the most influential plant traits determining plant strategy to access below ground resources. Yet little is known of natural variability in root distribution since collecting field data is challenging and labor-intensive. Studying stable water isotope compositions in plants could offer a cost-effective and practical solution to estimate the absorbing root surfaces distribution. However, such an approach requires developing realistic inverse modeling techniques that enable robust estimation of rooting distributions and associated uncertainty from xylem water isotopic composition observations. This study introduces an inverse modeling method that supports the assessment of the root allocation parameter (β) that defines the exponential vertical decay of a plants’ absorbing root surfaces distribution with soil depth. The method requires measurements obtained from xylem and soil water isotope composition, soil water potentials, and sap flow velocities when plants’ xylem water is sampled at a certain height above the rooting point. In a simulation study, we show that the approach can provide unbiased estimates of β and its associated uncertainty due to measuring errors and unmeasured environmental factors that can impact the xylem water isotopic data. We also recommend improving the accuracy and power of β estimation, highlighting the need for considering accurate soil water potential and sap flow monitoring. Finally, we apply the inverse modeling method to xylem water isotope data of lianas and trees collected in French Guiana. Our work shows that the inverse modeling procedure provides a robust analytical and statistical framework to estimate β. The method accounts for potential bias due to extraction errors and unmeasured environmental factors, which improves the viability of using stable water isotope compositions to estimate the distribution of absorbing root surfaces complementary to the assessment of relative root water uptake profiles.

scholarly journals Variations in Soil Respiration at Different Soil Depths and Its Influencing Factors in Forest Ecosystems in the Mountainous Area of North China

Forests ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 1081
Author(s):  
Dandan Wang ◽  
Xinxiao Yu ◽  
Guodong Jia ◽  
Wei Qin ◽  
Zhijie Shan
Keyword(s):  
Seasonal Variation ◽  
Soil Respiration ◽  
Soil Temperature ◽  
Water Content ◽  
Soil Water Content ◽  
North China ◽  
Forest Ecosystems ◽  
Mountainous Area ◽  
Forest Types ◽  
Root Cutting

An in-depth understanding of the dominant factors controlling soil respiration is important to accurately estimate carbon cycling in forest ecosystems. However, information on variations in soil respiration at different soil depths and the influencing factors in forest is limited. This study examined the variations in soil respiration at two soil depths (0–10 and 10–20 cm) as well as the effects of soil temperature, soil water content, litter removal, and root cutting on soil respiration in three typical forest types (i.e., Pinus tabulaeformis Carrière, Platycladus orientalis (L.) Franco, and Quercus variabilis Bl.) in the mountainous area of north China from March 2013 to October 2014. The obtained results show that soil respiration exhibited strong seasonal variation and decreased with soil depth. Soil respiration was exponentially correlated to soil temperature, and soil respiration increased with soil water content until reaching threshold values (19.97% for P. tabulaeformis, 16.65% for P. orientalis, and 16.90% for Q. variabilis), followed by a decrease. Furthermore, interactions of soil temperature and water content significantly affected soil respiration at different soil depths of forest types, accounting for 68.9% to 82.6% of the seasonal variation in soil respiration. In addition to soil temperature and water content, aboveground litter and plant roots affected soil respiration differently. In the three forest types, soil respiration at two soil depths decreased by 22.97% to 29.76% after litter removal, and by 44.84% to 53.76% after root cutting. The differences in soil respiration reduction between the two soil depths are largely attributed to variations in substrate availability (e.g., soil organic content) and soil carbon input (e.g., litter and fine root biomass). The obtained findings indicate that soil respiration varies at different soil depths, and suggest that in addition to soil temperature and water content, soil carbon input and dissolved organic substances may exert a strong effect on forest soil respiration.

Response of daily stem radial growth of Platycladus orientalis to environmental factors in a semi-arid area of North China

Trees ◽  
2014 ◽  
Vol 29 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Yuan Jiang ◽  
Bing-Qin Wang ◽  
Man-Yu Dong ◽  
Yong-Mei Huang ◽  
Ming-Chang Wang ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Radial Growth ◽  
North China ◽  
Arid Area ◽  
Platycladus Orientalis ◽  
Semi Arid

scholarly journals The Sap Flow Dynamics and Response of Hedysarum scoparium to Environmental Factors in Semiarid Northwestern China

PLoS ONE ◽  
2015 ◽  
Vol 10 (7) ◽  
pp. e0131683 ◽  
Author(s):  
Jifeng Deng ◽  
Guodong Ding ◽  
Guanglei Gao ◽  
Bin Wu ◽  
Yuqing Zhang ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Sap Flow ◽  
Flow Dynamics ◽  
Northwestern China

Environmental factors influencing the relationship between stem CO2 efflux and sap flow

Trees ◽  
2014 ◽  
Vol 29 (2) ◽  
pp. 333-343 ◽  
Author(s):  
Romana Bužková ◽  
Manuel Acosta ◽  
Eva Dařenová ◽  
Radek Pokorný ◽  
Marian Pavelka
Keyword(s):  
Environmental Factors ◽  
Sap Flow ◽  
Co2 Efflux ◽  
Factors Influencing ◽  
Stem Co2 Efflux ◽  
The Relationship
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