Jinzhu Ma

Lanzhou University | LZU · School of Earth and Environmental Sciences

In arid to semi‐arid regions, groundwater is a critical water resource heavily relied upon, with the recharge sources and patterns being predominantly shaped by climate change and regional disparities. To compare the characteristics of groundwater in the endorheic and exorheic river basins with the climate transition zone of Gansu Province, this st...

The water-rock interactions mainly include dissolution, precipitation, and ion exchange, etc. They participate in various geological processes and ecological-environmental processes. However, at present, insufficient consideration of the role of ion exchange in tracing the sources of ions in water and in isotopic techniques has limited the understa...

Land use significantly affects the rate and amount of groundwater recharge. To understand these patterns, stable isotope analyses (δ ² H and δ ¹⁸ O) and hydrochemical methods were employed to study the recharge and evolution of groundwater. MixSIAR Bayesian mixture modelling and statistical regression techniques were utilized to investigate the inf...

Climate change intensifies precipitation fluctuation and increases drought frequency around the globe. Water use efficiency (WUE) has proven to be a crucial metric to quantify the trade-off linking global carbon and water cycles in many aspects of terrestrial ecosystem function. Investigating the response of ecosystem WUE to multiannual precipitati...

A total of 37 monitoring wells in the project area of Dunhuang City, Gaotai, Yongdeng, Wushan and Lingtai counties of Gansu Province were monitored for their groundwater levels. 168 typical irrigation electric wells were selected to monitor the groundwater exploitation, analyze the changes in groundwater level, and evaluate the groundwater exploita...

The hydrochemical ion distribution, hydrogen and oxygen isotope characteristics and 14C age of Quaternary groundwater in the Dongzhi Tableland and along the Malian River of Longdong Loess Plateau were analyzed to understand the hydrogeological evolution rules and groundwater recharge sources of the Quaternary groundwater. The results showed that th...

Slope failure is a one of major process that causes severe landform variation and environment variation, and slope failure has become a major hidden danger to human settlement and urban construction in this vast loess region. The physical model of slope failure as induced by artificial rainfall was constructed in the field, and monitored the pore w...

Debris flow hazards can occur easily in loess regions, due to the particular characteristics of loessic material. Some of them have historically caused considerable damage to both the natural and the human environment. Little research has been conducted into the impact pressures caused by debris flows varying with densities and weights in loess reg...

Atmospheric N deposition patterns play an important role in the nitrogen cycles of arid ecosystems. This study observed a significant spatiotemporal variation in inorganic N concentrations in precipitation from 2013 to 2016 at eight sampling sites in the Hexi Corridor, northwestern China. Mean mNO3–/Cl– and mNH4⁺/NO3– values were 1.62 and 0.98 from...

The sources and storage of soil NO3⁻ in the western Tengger Desert, Northwest China, were explored using water chemistry analysis and stable isotope techniques. In line with the expansion and development of oases, part of the desert has been transformed into cultivated land and artificial forest land. The mean soil NO3⁻ contents found in areas of c...

AimTo investigate the responses of different components of soil respiration to environmental factors at different timescales in a vineyard ecosystem.Methods The trenching method was used to separate total soil respiration (TSR) into autotrophic respiration (AR) and heterotrophic respiration (HR). Soil respiration rates were measured by an LI-8100 a...

Photosynthesis is a major process included in land surface models. Accurately estimating the parameters of the photosynthetic sub-models can greatly improve the ability of these models to accurately simulate the carbon cycle of terrestrial ecosystems. Here, we used a hierarchical Bayesian approach to fit the Farquhar–von Caemmerer–Berry model, whic...

Following the scheme of the groundwater-soil-plant-atmosphere continuum (GSPAC), a simple process-based model (SiTH; Simple Terrestrial Hydrosphere) was developed to estimate the dynamics of terrestrial evapotranspiration (ET) at the daily step. The input data include net radiation, air temperature, precipitation, leaf area index, vegetation type a...

The effects of land use and land cover (LULC) dynamics on landslide susceptibility is not fully understood. This study evaluates the influence of LULC on landslide susceptibility and assesses the historic and future LULC changes in a high mountain region. A detailed inventory map showing the distribution of landslides was prepared based on the 2013...

The groundwater recharge and geochemical evolution of Quaternary aquifers of the Dunhuang Basin were studied using Cl- and stable isotopes and the results showed that c (Na+ )/c (Cl- )> 1 in most groundwater samples, carbonate equilibrium reaction and denitrification made ρ(HCO3 -) and ρ(NO3 -) concentrations lower in groundwater. Under normal circ...

In the mountainous area, the alluvial fan was a good place for human activity, but they are exposed to the potential debris flow, especially in southern of Gansu Province, China. Therefore, the Zuizi catchment and Beiyu River Basin were selected research object. Firstly, the rainfall of different return periods were calculated based on the analysis...

Accurate estimation of terrestrial evapotranspiration (E) is critical to understand the world's energy and water cycles. MOD16 is the core algorithm of the widely used global E data set (the Moderate Resolution Imaging Spectroradiometer [MODIS] E product). However, it exhibits considerable uncertainties in some regions. Based on the data from 175 f...

由于81Kr 化学性质稳定、半衰期长且在地下水运移过程中没有额外来源的优点，近年来，成为测定古老地下水年龄（100000~1000000 a）的有效手段. 国外对于81Kr 的测定方法、地下水定年应用研究已较为深入，而国内应用81Kr 作为水文地质学的研究尚处于起 步阶段. 本文通过对国内外81Kr 应用于地下水测年的原理以及81Kr 的测定方法进行总结，针对目前研究的问题进行探讨，并对今 后放射性氪核素在水文地球化学中的研究进行展望，为国内对于81Kr 的测定与在古地下水定年研究方面提供科学依据.

Debris flows that involve loess material produce important damage around the world. However, the kinematics of such processes are poorly understood. To better understand these kinematics, we used a flume to measure the kinematics of debris flows with different mixture densities and weights. We used sensors to measure pore fluid pressure and total n...

In the southwestern Tengger desert in northwestern China, nitrate circulation processes in the unsaturated zone and associated driving factors were studied using water chemistry and stable isotope techniques. At unvegetated sand sites, NO3⁻ content increases from the south to north in the desert. Additionally, a negative correlation (R² = 0.90, P <...

Modeling is an important tool in simulating and partitioning evapotranspiration (ET). To obtain realistic partitioning of ET, a hierarchical Bayesian (HB) method was used to fit the Priestly‐Taylor Jet Propulsion Laboratory (PT‐JPL) model against the multi‐tower FLUXNET datasets. Unique to the HB method is its ability to exchange of information bet...

Dunhuang basin is located in arid Northwest China and has the disadvantages of the harsh climate and fragile ecological environment， especially the water shortages. The evaluation of sustainable utilization of water resources is becoming a hotspot in the field of water resources management. However， the research on water resources sustainable utili...

Oasis effect may have significant impacts on the crop water use in irrigated filds of extremely arid conditions. Studies on crop coeffiients and its relevant inflence factors are essential to accurately determine the irrigation scheduling under such conditions. A two-year experiment was conducted in an irrigated vineyard to estimate evapotranspirat...

The partitioning of evapotranspiration (ET) is a critical factor in the terrestrial water balance and global water cycle, and understanding the partitioning across terrestrial biomes and the relationships between ET partitions and potential influencing factors is critical for predicting future ecosystem feedbacks. Based on an optimized Priestly-Tay...

Sequential Monte Carlo (SMC) samplers have become increasing popular for estimating the posterior parameter distribution with the non-linear dependency structures and multiple modes often present in hydrological models. However, the explorative capabilities and efficiency of the sampler depends strongly on the efficiency in the move step of SMC sam...

Sequential Monte Carlo (SMC) samplers have become increasing popular for estimating the posterior parameter distribution with the non-linear dependency structures and multiple modes often present in hydrological models. However, the explorative capabilities and efficiency of the sampler depends strongly on the efficiency in the move step of SMC sam...

地下水年龄是评价水资源的循环速度和更新能力的重要指标，随着科学技术的发展，放射性碳定年在地下水中的应用越来越普遍。采用14C 对河西地区典型盆地深层地下水年龄进行了计算，结果表明，河西走廊各盆地上游地下水较为年轻，金塔盆地、瓜州盆地山前地带地下水年龄小于50 年，反映了较快的补给循环速度。各盆地沿地下水流向，年代变大,中游地区地下水主要形成于1 万年以来，盆地下游深层地下水更为古老，部分地区超过1 万年，更新能力差。

沙漠地区富集的硝酸盐氮对全球气候变化和水文循环具有重大影响，以巴丹吉林沙漠为研究区，通过测试和分析不同水体硝酸盐同位素特征，发现沙漠地区不同水体硝酸盐特征来源以及循环转化规律，从而为区域氮循环研究提供依据。

The unsaturated zone is a significant feature of the nitrogen cycle in arid areas connecting atmospheric precipitation and surface water to groundwater. To measure NO3⁻, Cl⁻, and NH4⁺ concentrations, precipitation samples (39.9592°N, 94.3302°E) were collected at the western edge of the Mingsha sand dunes. Soil profiles were taken along the northern...

Assessing groundwater recharge characteristics (recharge rate, history, mechanisms (piston and preferential flow)) and groundwater age in arid and semi-arid environments remains a difficult but important research frontier. Such assessments are particularly important when the unsaturated zone (UZ) is thick and the recharge rate is limited. This stud...

Difficulty in measuring hydraulic conductivity, particularly under dry conditions, calls for methods of predicting the conductivity from easily obtained soil properties. As a complement to the recently published EMFX model, a method based on two specific suction conditions is proposed to estimate saturated film conductivity from the soil water rete...

Global and regional estimates of daily evapotranspiration are essential to our understanding of the hydrologic cycle and climate change. In this study, we selected the radiation-based PT-JPL model and assessed it at a daily timescale using 44 flux towers. These towers distributed in a wide range of ecological systems: croplands, deciduous broadleaf...

The ability to predict actual evapotranspiration flux (λEa) by physically based evaporanspiration (ET) model is limited globally due to the difficulty in validating the site-specific model parameters. Thus, the approaches for estimating λEa using only routine meteorological variables play a critical role in understanding and predicting hydrological...

Estimation of soil moisture distribution in desert regions is challenged by the deep unsaturated zone and the extreme natural environment. In this study, an entropy-based method, consisting of information entropy, principle of maximum entropy (PME), solutions to PME with constraints, and the determination of parameters, is used to estimate the soil...

Recent studies suggest that water flow in unsaturated porous media extends beyond the commonly known capillary-driven regime into the film regime. There is a need to develop the unsaturated hydraulic properties over the entire range of matric suctions to capture both flow regimes. In this study, Fredlund and Xing model is modified to represent the...

The ability to predict actual evapotranspiration flux (λE a) by physically based evaporanspiration (ET) model is limited globally due to the difficulty in validating the site-specific model parameters. Thus, the approaches for estimating λE a using only routine meteorological variables play a critical role in understanding and predicting hydrologic...

Evaporation capacity is an important factor that cannot be ignored when judging whether extreme precipitation events will produce groundwater recharge. The evaporation layer’s role in groundwater recharge was evaluated using a lysimeter simulation experiment in the desert area of Dunhuang, in the western part of the Hexi Corridor in northwestern Ch...

The distribution of stable isotopes and ions in precipitation in the Shule River Basin, northwestern China, were investigated to understand the regional water cycle and precipitation input to groundwater recharge. The study found that the mean annual concentrations of Ca2+, Na+, SO42–, Cl–, Mg2+, NO3–, and K+ in the basin were lower than those in o...

Using high-quality dataset from 12 flux towers in north China, the performance of four evapotranspiration (ET) models and the multi-model ensemble approaches including the sample averaging (SA) and Bayesian model average (BMA) were systematically evaluated in this study. The four models were the single-layer Penman-Monteith (P-M) model, the two-lay...

Using high-quality dataset from 12 flux towers in north China, the performance of four evapotranspiration (ET) models and the multi-model ensemble approaches including the simple averaging (SA) and Bayesian model average (BMA) were systematically evaluated in this study. The four models were the single-layer Penman–Monteith (P–M) model, the two-lay...

Groundwater recharge and evolution in the Shule River basin, Northwest China, was investigated by a combination of hydrogeochemical tracers, stable isotopes, and radiocarbon methods. Results showed the general chemistry of the groundwater is of SO42− type. Water–rock reactions of halite, Glauber’s salt, gypsum and celestite, and reverse ionic excha...

Unsaturated zone pore water has the potential to record history of recharge, palaeoenvironment, pollution movement and water-rock interaction as it percolates through and moves towards the water table. In this study, two 6-m cores from the Badain Jaran desert (NW China) were collected to explore this potential using directly extracted moisture. Por...

We investigated major ions, stable isotopes, and radiocarbon dates in a Quaternary aquifer in semi-arid northwestern China to gain insights into groundwater recharge and evolution. Most deep and shallow groundwater in the Helan Mountains was fresh, with total dissolved solids<1,000 mg L-1 and Cl- <250 mg L-1. The relationships of major ions with Cl...

In this study, we examined the year 2011 characteristics of energy flux partitioning and evapotranspiration of a sub-alpine spruce forest underlain by permafrost on the Qinghai–Tibet Plateau (QPT). Energy balance closure on a half-hourly basis was H + λE = 0.81 × (R n À G À S) + 3.48 (W m À2) (r 2 = 0.83, n = 14938), where H, λE, R n , G and S are...

Based on direct measurements of half-hourly canopy evapotranspiration (ET; W m−2) using the eddy covariance (EC) system and daily soil evaporation (E; mm day−1) using microlysimeters over a crop ecosystem in arid northwestern China from 27 May to 14 September in 2013, a Bayesian method was used to simultaneously parameterize the soil surface and ca...

Based on direct measurements of half-hourly canopy evapotranspiration (ET; W m −2) using the eddy covariance (EC) system and daily soil evaporation (E; mm day −1) using microlysimeters over a crop ecosystem in arid northwestern China from 27 May to 14 September in 2013, a Bayesian method was used to simultaneously pa-rameterize the soil surface and...

Evaluating the flood discharge and deposition process of a debris flow is important for risk assessment, management, and design of possible supporting works for geo-hazard mitigation. The movement and deposition process of a typical debris flow gully in southern Gansu province, China, was simulated using the Soil Conservation Service-curve number (...

Cultivating pasture changes the turnover of aggregates and aggregate-binding agents (soil organic carbon [SOC], total nitrogen [TN]), and affects soil nutrient levels. We tested the hypothesis that soil aggregate fractions and soil nutrient concentrations would exhibit temporal variation using a 55-year chronosequence of cultivated sites with silty...

Based on direct measurements of half-hourly canopy evapotranspiration (ET; W m-2) using the eddy covariance (EC) system and daily soil evaporation (E; mm d-1) using microlysimeters over a crop ecosystem in arid northwest China from 27 May to 14 September in 2013, a Bayesian method was used to simultaneously parameterize the soil surface and canopy...

Commonly used soil hydraulic models that account for capillary forces often do not perform well when water flow occurs in thin liquid films in unsaturated porous media. A new theoretical soil water retention curve model was formulated based on the film thickness function that accounts for matric potential. Coupling this new model with a modified To...

We developed a coupled water-oil simulation model to simulate the migration and transformation of petroleum-derived contaminants in the soil of the Xifeng oil field. To do so, we used the HYDRUS-2D model, which simulates the diffusion, adsorption or desorption, and microbial degradation of petroleum-derived hydrocarbons in the soil-water system. Th...

We used environmental tracers to provide insights into groundwater evolution and flow processes on the eastern margin of China's Tengger Desert and determine recharge sources and recharge timing along the flow paths. The chemical composition was generally Na+ enriched, with no dominant anions. The chemistry is strongly influenced by evaporation and...

The Mann–Kendall test, wavelet analysis was used to analyse the long‐term trends and periodicities in temperature, precipitation and streamflow in China's Shiyang River Basin since 1950. The Principal components analysis (PCA) was used to quantify the impacts of climate change and human activities on water resources. The annual mean air temperature...

Groundwater recharge and evolution in the Quaternary aquifer beneath the Dunhuang Basin was investigated using chemical indicators, stable isotopes, and radiocarbon data to provide guidance for regional water management. The quality of groundwater and surface water is generally good with low salinity and it is unpolluted. The dissolution of halite...

Based on chloride mass balance approach, we used two tracers (Cl− and NO3−) to study the interstitial water in four profiles of an unsaturated dune sand. The aim was to reconstruct the recharge history and use this to infer the long-term related climate changes and vegetation transitions in a cold-arid desert region of northwestern China. The estim...

Highlights ► We investigated the chemicals and stable isotopes in precipitation of an inland river Basin. ► The evaporation process altered the original relationship between δ2H and δ18O and resulted in d-excess values < 8‰. ► The relationship between precipitation δ18O and local temperature was statistically significant. ► The majority of the rain...

The groundwater recharge environments and hydrogeochemical characteristics in the Quaternary aquifer of Jiuquan Basin was investigated using a combination of chemical indicators, stable isotopes, and radiocarbon dating. The d-excess values of winter precipitation and surface water revealed that the meltwater from snow and ice played the dominant ro...

The possible sources of water pollution and the evolution of water quality in the Malian River Basin of China’s Longdong Loess Plateau were studied based on chemical analysis. Concentrations of major chemicals in the river were related to the distance downstream from the source of the river and the surface water in the upstream had good quality, wh...

Multiple isotopic and hydrogeochemical tracers were utilized to understand the recharge sources and geochemical evolution of groundwater in the Quaternary aquifer beneath Jinchang city and the adjacent Gobi desert area. The groundwater shows markedly depleted stable isotopic composition compared to modern rainfall. The signature of groundwaters fro...

Chloride concentrations in the interstitial water of the unsaturated zone in dune sands of the Badain Jaran desert, northwestern China have been used to examine the recharge history over the last 2000 years using a chloride mass balance approach. The estimated 0.9 mm yr− 1 recharge represents approximately 1% of annual precipitation in the western...

Based on surveys and chemical analyses, we performed a case study of the surface water and groundwater quality in the Wuwei basin, in order to understand the sources of water pollution and the evolution of water quality in Shiyang river. Concentrations of major chemical elements in the surface water were related to the distance downstream from the...

Multiple isotopic and hydrogeochemical tracers were utilized to understand the limits to recharge from Tibetan plateau to Gobi desert. The average direct recharge rate according to chloride mass balance is between 0.9–2.5 mm yr−1 based on an annual rainfall of 120 mm yr−1, indicating that this has negligible impact on groundwater. The groundwater s...

Sources of groundwater recharge to the Badain Jaran Desert in China have been investigated using geochemical and isotopic techniques. Stable isotope compositions (δ18O and δ2H) of shallow groundwater and surface water from oasis lakes evolve from a starting composition considerably depleted compared to local unsaturated zone moisture, confirming in...

A 700-year semi-quantitative history of diffuse groundwater recharge in the Badain Jaran Desert (Inner Mongolia) is proposed on the basis of solute data from multiple unsaturated zone groundwater profiles using mass balance of chloride to establish recharge rates and profile chronologies. Four relatively humid (1330—1430, 1500—1620, 1700—1780 and 1...