December 2024
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19 Reads
Journal of Environmental Management
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December 2024
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19 Reads
Journal of Environmental Management
November 2024
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7 Reads
Agricultural Water Management
October 2024
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19 Reads
Land Degradation and Development
Phosphorus (P) is an important soil element for sustaining plant growth and the integrity of terrestrial ecosystems, and the soil P cycle is strongly influenced by climate change and agricultural activities. However, little is known about how soil P has evolved with climate change and intensive agriculture at mid‐high latitudes, where the soil P cycle is sensitive to climate change. To answer this question, an ecohydrological model (EcoHAT‐P) driven by remote sensing data was used in this study to calculate soil P concentration and loss and was calibrated and validated using 272 soil samples collected in the Sanjiang Plain, a typical mid‐high latitude region with a long history of strong agricultural activity. Soil P concentration and loss, and plant uptake of soil P, were analyzed for the years 2000–2019 and 2020–2040. The results showed that soil total P, soil P loss, and plant P uptake all increased under intensive agriculture. The soil P cycle at mid‐high latitudes was more sensitive to temperature than to precipitation. Increased temperature would increase soil P loss and plant P uptake by 93.94% and 8.16%, respectively, and soil legacy P from intensive agriculture would become the main source even if external P inputs were eliminated. The results highlight the evolution of soil P transport at mid‐high latitudes and clarify the response of soil P cycle to climate change under intensive agriculture.
September 2024
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9 Reads
Ecological Indicators
The water delivery capacity of Karez is gradually declining, and it is possible that such a traditional water supply systems might be completely replaced by modern water conservancy projects. To determine whether these ancient water conservancy projects have a future, we conducted a study in a typical research area of Xinjiang Province, China. Using remote sensing technology, in situ surveying, and the analytic hierarchy process, we evaluated Karez in terms of water delivery capacity, water intake convenience, and capability to maintaining the ecological stability of the surrounding area. The derived results are as follows. (1) During 2005-2020, the length of 14 Karez systems in the study area decreased; however, the calculated water access convenience degree (C) indicated that Karez are more convenient for water intake compared with modern transmission channels, i.e., C karez = 0.68 and C channel = 0.51. (2) The mean annual runoff of the Karez system was 69.38 × 10 6 m 3 , similar to that of the modern water transmission channels in the area (73.49 × 10 6 m 3). (3) Change in ecological sensitivity occurred mostly in regions where Karez systems have disappeared, with increase of 70.69 % and 14.51 % in high and medium sensitivity areas, respectively, and decline of 21.53 % and 9.74 % in low-sensitivity and non-sensitivity areas. Our research shows that Karez have considerable water delivery capacity, and that their existence is beneficial to maintaining the stability of the surrounding ecology. The Karez system can be considered a template for harmonious coexistence between humans and nature.
August 2024
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27 Reads
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1 Citation
The Science of The Total Environment
June 2024
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67 Reads
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1 Citation
Ecological connectivity in landscapes is crucial for plant diversity conservation. The barrier risk to ecological connectivity represents the risk to ecological connectivity loss or weakening, resulting from the barrier to biological information exchange among habitats. Therefore, clarifying the barrier risk to the ecological connectivity of plant diversity in space can reveal the spatial impacts of reduced ecological connectivity on plant diversity. This study analyzed effects of karst peak, river network, arable land, and impervious surface on plant diversity in karst natural, countryside, urban, and island landscapes in Guizhou Province with fragile environment. Then, we calculated the barrier distance of ecological connectivity to reveal the barrier risk to the ecological connectivity of plant diversity in space. The results showed that karst peak was the source of high plant diversity, and plant diversity could diffuse about 400 m around karst peaks. River network and arable land enhanced the connectivity among karst peaks to maintain plant diversity, and the effect on enhancing the connectivity was about 300 m and 450 m, respectively, while the weakening effect of impervious surface on connectivity was about 350 m. Based on the distance for plant diversity diffusing around karst peaks, the barrier distance of ecological connectivity was determined by the combination type of river network, arable land and impervious surface in landscapes. From low to high, the barrier risk to the ecological connectivity of plant diversity was about 1,110 m in the combination of river network and arable land, about 790 m in the combination of river network, arable land and impervious surface, about 520 min the combination of arable land and impervious surface, about 400 m in the combination of river network and impervious surface. Our findings clarify the barrier risk to the ecological connectivity of plant diversity in space, and provide a scientific basis for plant diversity conservation from the perspective of ecological connectivity.
June 2024
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9 Reads
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5 Citations
Ecotoxicology and Environmental Safety
May 2024
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18 Reads
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11 Citations
Ecological Indicators
April 2024
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24 Reads
Karst peaks and depressions are scattered in karst zones with strong spatial heterogeneity and fragile ecological environments and are crucial for determining the degree of karst geomorphologic development. However, realizing automatic depiction and extracting depressions with high accuracy is difficult because of their complex morphology. Herein, based on 12.5-m resolution DEM data, six typical karst peaks from depressions in southwest China were selected as the study areas and a revised terrain openness index method based on slope mutation points (ROBSMPs) was used to determine the degree of karst geomorphologic development and the boundary of karst depressions. The extent of depressions extracted by ROBSMPs and the terrain openness index method with the extent of depressions hand-drawn based on remote sensing images was compared and analyzed. The results show that compared with the topographic openness index method, the overall accuracy of karst depression extracted by ROBSMPs was improved and the perimeter, area, and raster displacement error indexes were reduced. ROBSMPs realized high-precision extraction of depressions, thereby strengthening the applicability of the topographic openness index method to karst peak zones. This study offers a new perspective and path toward the expansion of digital terrain analysis technology in karst mountainous areas and is expected to play a vital role in the extraction of similar geomorphic units in karst zones.
March 2024
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138 Reads
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2 Citations
Water
Frequent surface water–groundwater interactions and prevalent anthropogenic inputs make karst water systems vulnerable to human disturbance. As a typical karst region in North China, the Jinan Spring Catchment has become increasingly threatened due to rapid population growth and urban expansion. In this study, the local river–spring interaction and its interference with the hydrogeochemical evolution of groundwater are evaluated based on water stable isotopes and hydrochemistry. Twenty-two karst groundwater, eleven Quaternary pore water, sixteen spring water, and thirty-two surface water samples were collected during low- and high-flow conditions over the course of a year. The isotopic signatures of four different water types display significant differences, reflecting the recharge–discharge relationship of the karst water system. Mountainous springs feature lighter isotopes, whereas urban springs have significantly heavier isotopes. The result of end-member mixing analysis shows that the surface–groundwater interaction varies spatially and temporally within the spring catchment. Urban springs receive considerable replenishment from the surface water, especially after rainy episodes (up to 50%), while mountainous springs show little hydraulic dependence on surface water leakage (4~6%). Local mineral dissolution (including calcite, dolomite, gypsum, and halite), CO2 dissolution/exsolution, and cation exchange are the main hydrogeochemical processes constraining water chemistry in the spring catchment. The deterioration of water quality can be attributed to anthropogenic influences involving the discharge of domestic effluents, agricultural activities, and irrigation return flow. The findings of this work can improve our understanding of the complex karst water system and serve as a reference for sustainable groundwater management in other karst areas of northern China.
... This species is predominantly adapted to acidic high-altitude soils and exhibits sensitivity to saline conditions. Under abiotic stress, particularly elevated temperatures, R. simsii enhances its antioxidant defense mechanisms by increasing the activity of antioxidant enzymes and the content of proline, thereby reducing the damage caused by ROS [21]. Our previous study suggests that MT can minimize the damage to Rubisco caused by heat stress by increasing RhRbsA expression levels, while also promoting ATP production under heat stress by up-regulating the expression of RhATPB [22]. ...
June 2024
Ecotoxicology and Environmental Safety
... Since the 1990s, numerous studies have been undertaken to assess terrestrial carbon sinks at different scales, utilizing ground surveys, flux measurements, atmospheric inversions, and model simulations [6]. Although current research has produced some findings on terrestrial carbon sinks using various methods, notable differences exist among different studies [7]. Furthermore, most of the existing research conducted a relatively insufficient analysis of the temporal variations and spatial differences [8]. ...
May 2024
Ecological Indicators
... Groundwater chemical composition is a crucial component of the groundwater environment, influenced not only by precipitation composition and quantity but also by aquifer minerals, geological structures, groundwater dynamics, and human activities [14]. Specifically, the primary chemical characteristics of groundwater are closely associated with the processes of dissolution and precipitation of minerals in the aquifer, and the type of water-rock interaction predominantly governs the evolution of groundwater hydrochemistry [15,16]. These interactions serve as "fingerprints" for recording the geochemical history and current status of different aquifers, crucially providing key evidence for hydrogeochemical interactions occurring during groundwater mixing processes. ...
March 2024
Water
... Despite variations in land use type, GPP increased overall, with grassland experiencing the greatest increase in GPP 55 LUEopt ∼500-1000 1982-2015 Huang et al. 56 ecohydrological ∼600-900 1999-2018 Xu et al. 57 SMIPP ∼1000 2001-2018 Gong et al. 58 PML-V2 MODIS ∼800-1200 2000-2018 Li et al. 59 MODIS ∼600-800 2001-2021 Table 9. Estimation of GPP in Shanxi Province using different terrestrial models. ...
January 2024
... The increase in the concentrations of greenhouse gases, such as carbon dioxide (CO 2 ) and methane, since the Anthropocene, has made climate warming a global issue of widespread concern to the international community Zhang et al., 2022). The Chinese government proposed to achieve "carbon neutrality" by 2060 by reducing CO 2 emissions and enhancing the carbon sinks capacity of ecosystems Zhou et al., 2023). 2023 was reportedly the hottest year in meteorological records (Jiang et al., 2024). ...
September 2023
The Science of The Total Environment
... Environmental covariates in DSM are primarily derived from digital elevation models, remotely sensed (RS) data and other detailed geospatial data sources. Numerous ML models have been implemented in DSM to predict soil salinity [5,28]. The most commonly used ML models include Random Forest [29], Support Vector Regression (SVR) [30], Artificial Neural Network (ANN) [31], Genetic Programming [32], stochastic gradient tree boosting (SGB) [33], LightGBM [34], and XGBoost [28]. ...
September 2023
Land
... return to the atmosphere in the form of evapotranspiration [10,11], causing these regions to be classified as vulnerable to desertification [12]. For example, in semi-arid regions, agricultural irrigation is a parameter that should trend toward intelligent irrigation [13][14][15][16]. ...
September 2023
... It has been preliminary explored in obtaining topography [55], soil erosion [56], ecological factor parameters, and water conservancy projects [57,58]. However, more attention should be paid to its application in low-altitude meteorology [59], soil water content [60], and river flow estimation [61] to analyze the real-time changes in the slope water yield process. Geophysical exploration relies on the observation of modern scientific and technological equipment, such as thermal infrared imagers, flux towers, phenological cameras, etc., which can capture the analysis results intuitively and conveniently. ...
January 2021
National Remote Sensing Bulletin
... Wind erosion reduction and water erosion reduction showed tradeoff relationships in northwestern Shaanxi and western Gansu provinces, central Ningxia Hui and southwestern Inner Mongolia autonomous regions, where are fragmented areas with high terrain, large elevation varation, and concentrated precipitation. It is suggested that comprehensive management of small watersheds should be undertaken in the future, with treatments to protect gully head near the gully edge line, construction of check dams in dry gully, adoption of terracing on slopes, and restoration vegetation Guan et al., 2023). ...
April 2023
The Science of The Total Environment
... Remote sensing index method is used to analyze and evaluate the ecological conditions in arid areas (Guo et al., 2019;Lin et al., 2022;Yang et al., 2021;Zhang et al., 2020). The remote sensing hydrological station (RSHS) technology used in this study is applicable to calculating river discharge at various scales (Lou et al., 2023a,b, Yang et al., 2019. It effectively overcomes the problem of calculating the discharge of small-and medium-sized rivers in ungauged areas , compensates for the lack of hydrological data, and forms the basis of a new method proposed for accurate comparison and exploration of the connection between Karez systems and modern water transmission projects. ...
April 2023
Journal of Hydrology