Article
Agronomy
Bin Wang, Chengzhang Wang, Zhenhua Wang, Xin Wang, Zhou Jia, Lingli Liu
Summary: This study investigated how elevated aerosols affect plant transpiration by observing the sap flow of poplar saplings in northern China periodically over a wide range of aerosol loading. The findings suggest that high aerosol loading significantly decreased canopy transpiration, mainly due to the declined VPD.
AGRICULTURAL AND FOREST METEOROLOGY
(2022)
Article
Environmental Sciences
Yan Deng, Song Wu, Jing Ke, Aijun Zhu
Summary: This study aimed to evaluate the effect of groundwater depth on plant sap flow velocities in the Karst Critical Zone. Results showed significant differences in sap flow velocity among plots with different groundwater depths, primarily influenced by meteorological factors such as photosynthetically active radiation and vapor pressure deficit. The karst aquifer medium and groundwater depth were identified as main factors causing variance in sap flow velocity among the sample plots.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Forestry
Sander O. Denham, A. Christopher Oishi, Chelcy F. Miniat, Jeffrey D. Wood, Koong Yi, Michael C. Benson, Kimberly A. Novick
Summary: Plants experience hydraulic stress under conditions of low water availability and/or high atmospheric demand for water. Different species adapt to respond to this stress by closing stomata to maintain leaf water potential (isohydric species) or allowing the potential to decline (anisohydric species). Sensitivity of canopy conductance to soil moisture varies among sites and species, while sensitivity to vapor pressure deficit remains relatively constant.
Article
Agronomy
Muhammad Hayat, Sundas Iqbal, Tianshan Zha, Xin Jia, Duo Qian, Charles P-A Bourque, Alamgir Khan, Yun Tian, Yujie Bai, Peng Liu, Ruizhi Yang
Summary: The study revealed that nighttime sap flow in desert-dwelling shrubs is influenced by air temperature, water vapor pressure deficit, stomatal conductance, and soil water content, with daytime sap flow rates significantly higher than those at night, forming a positive linear association during the growing season. The multiple regression model analysis showed that together, temperature, water vapor pressure deficit, and stomatal conductance explain 63% of the variation in nighttime sap flow, highlighting the importance of temperature and soil water content in controlling nighttime water losses through transpiration.
AGRICULTURAL AND FOREST METEOROLOGY
(2021)
Article
Agronomy
Cristina Vasquez, Rolando Celleri, Mario Cordova, Galo Carrillo-Rojas
Summary: This study estimated evapotranspiration in the highlands of the Andes and found that missing variables had a significant impact on the calculation. Calibration and validation methods were essential in estimating solar radiation, and replacing minimum temperature with dew point temperature was a reliable alternative when relative humidity observations were missing. The results yielded highly accurate estimates, which are important for improving water productivity.
AGRICULTURAL WATER MANAGEMENT
(2022)
Article
Horticulture
Matteo Zucchini, Arash Khosravi, Veronica Giorgi, Adriano Mancini, Davide Neri
Summary: The growth pattern and response of cherry fruit to environmental factors, particularly VPD, were studied through continuous monitoring over two years, showing distinct variations in growth stages under different conditions. The findings suggest potential applications of hysteresis curves for evaluating fruit maturation and precision fruit farming.
Article
Forestry
Thibaud Andre-Alphonse, Claudele Ghotsa Mekontchou, Pascal Rochon, Audrey Maheu
Summary: This study aimed to understand the influence of residual basal area (BA) on transpiration in mixed temperate forest stands dominated by red maple (Acer rubrum) in southeastern Canada. The research found that residual BA had a significant impact on transpiration, with higher residual BA resulting in increased transpiration, especially under dry atmospheric conditions. The study highlights the need for better modeling of forest water budgets and partitioning overstory and understory evapotranspiration to develop more appropriate residual BA management strategies.
FOREST ECOLOGY AND MANAGEMENT
(2023)
Article
Plant Sciences
Bin Wang, Zhenhua Wang, Chengzhang Wang, Xin Wang, Jing Li, Zhou Jia, Ping Li, Jin Wu, Min Chen, Lingli Liu
Summary: This study found that high aerosol concentrations suppressed sun leaf transpiration by reducing leaf-to-air vapour pressure deficit, while had no effect on shade leaf transpiration. Increasing aerosol concentration caused stomatal conductance of both sun and shade leaves to decrease more rapidly, resulting in their transpiration rates becoming less sensitive to vapour pressure deficit. Aerosols also reduced sap flow density and its sensitivity to vapour pressure deficit, indicating that plant water use becomes more conservative under elevated aerosol concentrations.
JOURNAL OF ECOLOGY
(2021)
Article
Horticulture
Arash Khosravi, Matteo Zucchini, Veronica Giorgi, Adriano Mancini, Davide Neri
Summary: Recent studies on olive fruit growth have focused on circadian monitoring and found that environmental factors, particularly vapor pressure deficit, play a key role in fruit growth. Response of fruit transversal diameter to VPD shows different patterns during the third and fourth phases of fruit growth, which can be valuable for smart fruit management in olive production.
Article
Agronomy
Kai Zhou, Quan Zhang, Lihua Xiong, Pierre Gentine
Summary: Terrestrial evapotranspiration (ET) is a critical component of the land surface and accurate estimation of ET is crucial for understanding global water and energy budgets. Current ET estimation models rely on remotely sensed data, but uncertainty remains in representing ecological factors. This study proposes a model that combines solar-induced fluorescence (SIF) and meteorological variables, validated across different flux stations globally, showing good performance and potential for global scale ET estimation.
AGRICULTURAL AND FOREST METEOROLOGY
(2022)
Article
Plant Sciences
Sipan Wu, Xiaoxuan Gu, Yanghang Zheng, Luzhen Chen
Summary: The study explores nocturnal water-use strategies among co-occurring mangrove species. It shows that nocturnal sap flow (Q(n)) has a significant contribution to the daily sap flow (Q), and it is associated with nocturnal transpiration and stem water refilling processes. The differences in Q(n)/Q among species are mainly due to the diversity in stem recharge patterns and response to high salinity conditions. Overall, the diverse ways Q(n) properties act as water-compensating strategies help mangrove trees overcome water scarcity.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Agronomy
Bin Wang, Xu Yue, Hao Zhou, Jun Zhu
Summary: Diffuse radiation has a significant impact on ecosystem evapotranspiration and can enhance evapotranspiration efficiency. It is important to consider the diffuse fertilization effect when assessing aerosol-induced perturbations in the water cycle.
AGRICULTURAL AND FOREST METEOROLOGY
(2022)
Article
Engineering, Civil
Shinjiro Ohkubo, Takashi Hirano, Kitso Kusin
Summary: Tropical peat swamp forests play a significant role in water circulation, but their evapotranspiration is affected by fire and drainage. Environmental factors such as vapor pressure deficit and groundwater level can control ET differently depending on conditions, with VPD negatively affecting ET due to stomatal regulation functions under dry atmospheric conditions. Drainage deepens the groundwater level and severely decreases ET in cases with extremely deep groundwater levels.
JOURNAL OF HYDROLOGY
(2021)
Article
Horticulture
Xiaocong Jiao, Xuemei Yu, Juping Ding, Qingjie Du, Jiayu Zhang, Xiaoming Song, Ping Bai, Jianming Li
Summary: Increasing vapor pressure deficit (VPD) by decreasing humidity does not promote tomato growth and nutrient absorption in the low-temperature, high-humidity environment of winter and spring. Lowering humidity combined with normal nitrogen level is more effective in promoting tomato growth under low-temperature conditions.
SCIENTIA HORTICULTURAE
(2022)
Article
Plant Sciences
Nadezhda Nadezhdina, Christian Toetzke, Simone Mereu, Jan Cermak, Helmut Tributsch
Summary: This study investigated the response of sap flow in different tree organs to circadian regulation, by illuminating the crown of a linden tree with artificial daylight mimicking solar conditions. The results showed that the response of sap flow to light stimuli at night was weak and non-linear, with very low induced sap flow compared to daytime. This study demonstrated the effectiveness of internal regulation in large trees in response to external stimuli.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2021)
Article
Biodiversity Conservation
Xiao-Yan Li, Fang-Zhong Shi, Yu-Jun Ma, Shao-Jie Zhao, Jun-Qi Wei
Summary: The study presents the first long-term direct measurement of CO2 flux over Qinghai lake, revealing that the ice-covered period absorbs more CO2 from the atmosphere compared to the ice-free period. Saline lakes on the Qinghai-Tibet Plateau were found to be a significant sink for CO2, accounting for approximately one third of the net carbon sink in the terrestrial ecosystems.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Forestry
Yuanqiao Li, Yingping Pan, Xiaoyan Li, Jing Zhao, Fangzhong Shi, Xiuchen Wu, Yongmei Huang
Summary: This study reveals the legacy effects of extreme wetness events on tree growth and water status in a semi-arid region of North China. It is found that extreme wetness leads to increased tree water uptake from middle and deep soil layers, resulting in improved water status and enhanced tree growth.
TREES-STRUCTURE AND FUNCTION
(2022)
Article
Computer Science, Information Systems
Xiuchen Wu, Xiaofei Jiang, Hongyan Liu, Craig Allen, Xiaoyan Li, Pei Wang, Zongshan Li, Yuting Yang, Shulei Zhang, Fangzhong Shi, Jiaojun Zhu, Pengtao Yu, Mei Zhou, Pengwu Zhao, Yanhui Wang, Chao Yue, Deliang Chen
Summary: In this study, we established a country-wide synthetic stand structure database for plantation forests in China, the world's largest player in plantation forests. The database includes various parameters such as tree species, stand age, tree height, stand density, canopy coverage, diameter at breast height, as well as ancillary topographical and soil properties. This database supports research on the evolution and health of plantation forests in response to climate change and disturbances, and benefits sustainable forest management and future afforestation planning at a national level.
Article
Geosciences, Multidisciplinary
Yu-Jun Ma, Ting Xie, Xiao-Yan Li
Summary: Soil organic carbon (SOC) on the Qinghai-Tibet plateau plays a significant role in global carbon dynamics. This study assessed the SOC stock and spatial patterns in the Qinghai Lake watershed. The results showed that SOC content decreased with depth and varied among different vegetation types. Soil profile depth, soil water content, and NDVI together explained a large portion of the variation in SOC density. The regression-kriging method was found to be the best approach for predicting SOC in the study area. The assessment revealed high storage and heterogeneity of SOC in the watershed, with implications for the sustainability of regional terrestrial ecosystems.
Article
Environmental Sciences
Qiwen Liao, Xiaoyan Li, Fangzhong Shi, Yuanhong Deng, Pei Wang, Tingyun Wu, Junqi Wei, Fenglin Zuo
Summary: This study quantified the nocturnal evapotranspiration in alpine regions and clarified the different response of evapotranspiration to climate variables during daytime and nighttime. The results showed that nocturnal evapotranspiration accounts for a relatively high proportion of total evapotranspiration and there are differences in the response to climate variables at different elevations.
Article
Ecology
Si-Yi Zhang, Zhi-Hua Zhang, Bin He, Zhi-Yun Jiang, Xiao-Yan Li
Summary: This study investigated the impact of shrub encroachment on water infiltration patterns and found that it altered the microtopography and soil properties of the hillslope, thus affecting surface hydrological processes.
Article
Ecology
Hongyun Yao, Xiaoyan Li, Cicheng Zhang, Pei Wang, Fangzhong Shi, Yujing Deng
Summary: A study was conducted on the Qinghai-Tibet Plateau to compare the photosynthetic capacity and functional traits of three different plant functional types at different altitudes. Simulations were also done to predict the photosynthetic capacity of these plants under potential future scenarios. The results showed that different plants have different responses to temperature and CO2 concentration changes, and grass may be more resistant to future warming.
Article
Environmental Sciences
Yuanhong Deng, Xiaoyan Li, Fangzhong Shi, Linna Chai, Shaojie Zhao, Mengkai Ding, Qiwen Liao
Summary: This study investigates the effects of over 160,000 thermokarst lakes (TLs) on the surrounding vegetation in the Qinghai-Tibet Plateau. The research finds that TLs can improve plant growth through increased water availability, but they also negatively impact the greenness of the surrounding vegetation. The study also reveals the nonlinear relationship between NDVI and lake moisture, contributing to a better understanding of the landscape.
REMOTE SENSING OF ENVIRONMENT
(2022)
Review
Geosciences, Multidisciplinary
Zhongkai Li, Xiaoyan Li, Sha Zhou, Xiaofan Yang, Yongshuo Fu, Chiyuan Miao, Shuai Wang, Guanghui Zhang, Xiuchen Wu, Chao Yang, Yuanhong Deng
Summary: This article reviews the research advances in coupled soil-vegetation-hydrological processes at different spatial scales and summarizes the spatial upscaling methods and modeling approaches. The article identifies and summarizes the coupling processes and analyzes the limitations and knowledge gaps in observations, mechanisms, scaling methods, and modeling approaches. To achieve a deep integration of various coupling processes across different spatiotemporal scales, future work should strengthen observations and mechanism studies, develop new scaling methods, and consider the effects of plant behavior and soil hydraulic properties.
SCIENCE CHINA-EARTH SCIENCES
(2022)
Article
Environmental Sciences
Yan Bai, Yanlan Liu, Lara M. Kueppers, Engui Li, Cicheng Zhang, Kailiang Yu, Xiaofan Yang, Xiaoyan Li
Summary: Studying the eco-physiological responses of two desert riparian species, the researchers found that root morphological traits and stomatal sensitivity to leaf water potential are key factors in characterizing water stress responses in dryland ecosystems. Improved measurements and representations of these traits could contribute to better assessments of dryland ecosystem functions.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Environmental Sciences
Guangrong Hu, Xiaoyan Li, Xiaofan Yang, Fangzhong Shi, Haoran Sun, Baoshan Cui
Summary: This study improves the conventional trenching observation scheme and successfully monitors high-resolution subsurface flow processes from soil to bedrock layer in a headwater catchment. The results show that slope aspect significantly affects runoff generation, with south-facing slope dominated by overland flow and north-facing slope dominated by subsurface flow. Runoff generation exhibits distinct patterns across seasons and freeze-thaw stages, suggesting the need for time-based classification criteria.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Mengkai Ding, Xiaoyan Li, Zongyi Jin
Summary: This study estimated the spatial distribution of soil organic carbon (SOC) content in a typical thermo-erosion gully (TG) on the northeastern Tibetan Plateau in China, and characterized the SOC content changes in different landscape regions within the TG. The support vector machine (SVM) was found to be an optimal machine learning algorithm for predicting SOC content. Silt content was the most influential factor affecting SOC content in the TGs, and SOC content varied among different landscape regions. The study highlights the importance of understanding the distribution of SOC content in different TGs using SVM.
Article
Engineering, Civil
Yu Zhang, Xiaoyan Li, Siyi Zhang, Huawu Wu, Fangzhong Shi, Wei Li, Chuan Yuan
Summary: The precise modeling of rainfall interception is crucial for understanding the water balance of forest ecosystems, especially in water-stressed restoration regions. This study estimated the rainfall interception of four representative deciduous shrubs in northern China and compared the performance of two different models. The results showed that the canopy storage capacity has a significant impact on the rainfall interception capabilities of different shrub species.
JOURNAL OF HYDROLOGY
(2023)
Article
Agronomy
Shanbao Liu, Fadong Li, Qiuying Zhang, Zhao Li, Chao Tian, Yunfeng Qiao, Kun Du, Hefa Cheng, Gang Chen, Xiaoyan Li
Summary: The saline soils in the Yellow River Delta are affected by seawater intrusion and anthropogenic reclamation. The study found that long-term reclamation significantly reduced soil salinity and improved soil quality, leading to sustainable development.
Article
Ecology
Junqi Wei, Xiaoyan Li, Lei Liu, Torben Rojle Christensen, Zhiyun Jiang, Yujun Ma, Xiuchen Wu, Hongyun Yao, Efren Lopez-Blanco
Summary: Predicted intensified climate warming may alter net carbon uptake in the Qinghai-Tibetan Plateau. Soil moisture and other environmental factors can regulate net carbon uptake. Alpine swamp meadows were found to be a persistent and strong carbon sink, with ecosystem respiration mainly regulated by soil water content. Future changes in soil hydrological conditions may affect soil respiration and ecosystem carbon sink magnitude.