Long‐Term 15N Balance After Single‐Dose Input of 15N‐Labeled NH4+ and NO3− in a Subtropical Forest Under Reducing N Deposition

Xie, Di; Duan, Lei; Si, Gangyan; Liu, Wenjing; Zhang, Ting; Mulder, Jan

doi:10.1029/2021gb006959

Cited by 24 publications

(16 citation statements)

References 83 publications

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“…While the correlation between AL and COD Mn does not increase continuously, it is also maintained at a high level in a large buffer. The reason may be that NH 3 -N is more prone to retention in the soil [57], resulting in weaker migration of NH 3 -N than that of COD Mn . This also explains why the correlation between AL and NH 3 -N decreases with the increase in the buffer.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal Characteristics of the Water Quality and Its Multiscale Relationship with Land Use in the Yangtze River Basin

Zeng

et al. 2021

Remote Sensing

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The spatiotemporal characteristics of river water quality are the key indicators for ecosystem health evaluation in basins. Land use patterns, as one of the main driving forces of water quality change, affect stream water quality differently with the variations in the spatiotemporal scales. Thus, quantitative analysis of the relationship between different land cover types and river water quality contributes to a better understanding of the effects of land cover on water quality, the landscape planning of water quality protection, and integrated water resources management. Based on water quality data of 2006–2018 at 18 typical water quality stations in the Yangtze River basin, this study analyzed the spatial and temporal variation characteristics of water quality by using the single-factor water quality identification index through statistical analysis. Furthermore, the Spearman correlation analysis method was adopted to quantify the spatial-scale and temporal-scale effects of various land uses, including agricultural land (AL), forest land (FL), grassland (GL), water area (WA), and construction land (CL), on the stream water quality of dissolved oxygen (DO), chemical oxygen demand (CODMn), and ammonia (NH3-N). The results showed that (1) in terms of temporal variation, the water quality of the river has improved significantly and the tributaries have improved more than the main rivers; (2) in the spatial variation respect, the water quality pollutants in the tributaries are significantly higher than those in the main stream, and the concentration of pollutants increases with the decrease of the distance from the estuary; and (3) the correlation between DO and land use is low, while that between NH3-N, CODMn, and land use is high. CL and AL have a negative effect on water quality, while FL and GL have a purifying effect on water quality. In particular, AL and CL have a significant positive correlation with pollutants in water. Compared with NH3-N, CODMn has a higher correlation with land use at a larger scale. The results highlight the spatial scale and seasonal dependence of land use on water quality, which can provide a scientific basis for land management and seasonal pollution control.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal Characteristics of the Water Quality and Its Multiscale Relationship with Land Use in the Yangtze River Basin

Zeng

et al. 2021

Remote Sensing

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“…The desert-staggered transition zone is the foundation of the oasis formation and development. The Haloxylon ammodendron in this area are important plant protection communities and are all undergoing complex energy conversion and material exchanges [48,49]. At present, most of the research on ESV is based on small river basins, indicating a clear gap in the literature.…”

Section: Discussionmentioning

confidence: 99%

Evaluation on the Change Characteristics of Ecosystem Service Function in the Northern Xinjiang Based on Land Use Change

et al. 2021

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Monitoring the interannual changes in land use and the temporal and spatial characteristics of the ecosystem services value (ESV) can help to comprehensively and objectively understand the distribution of regional ecological patterns. The mountain–oasis–desert transition zone in the northern Tianshan Mountain region of Xinjiang, China, is a geographically unique area with a highly sensitive ecosystem. As a data source, the study uses Landsat TM images from 1990, 2000, 2010, and 2018 along with GIS-extracted data to calculate the dynamic degree of land use. As well, the spatial and temporal patterns of land use change and ESV are quantitatively analyzed by using the equivalent factor method, sensitivity index, and spatial correlation studies. The results reveal the following: (1) From 1990 to 2018, the land use changes in the northern Tianshans are relatively drastic, mainly due to the increase in cultivated land, grassland and construction land, and the decrease in forest land, water, and unused land. (2) The ESV increases and then decreases, for a total loss of about 271.63 × 108 yuan. The largest decrease is in forest value, and the largest increase (around 129.94%) is in construction land. (3) The spatial distribution pattern of ESV in the northern Tianshans is apparent, showing high in the north and southwest, and low in the central and southeast portions of the study area. Additionally, there is a visible spatial correlation and aggregation in ESV. The present research can provide theoretical support for the environmental protection of the ecologically vulnerable area of the northern Tianshans as well as for further construction across the region.

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“…N transformation in soil, especially nitrification of NH 4 + from atmospheric deposition, causes soil acidification, often even contributing more acidity than the actual H + deposited to the soil. In the Tieshanping subtropical forest, outside Chongqing city in southern China, these values were 2.03 keq ha −1 yr −1 and 0.76 keq ha −1 yr −1 , respectively, during the period 2001-2020 (Xie et al, 2021).…”

Section: H I G H L I G H T S G R a P H I C Abstractmentioning

confidence: 96%

“…In comparison, the control measures in China began approximately 20 years later than those in Europe and North America. Also in China significant ecological benefits have been achieved in recent years (Duan et al, 2016;Xie et al, 2021Xie et al, , 2024. Here, we review the estimated emissions and deposition of S and N in China during the last four decades, based on monitoring and modeling, and evaluate the effect of emission control based on the responses of forest soils and stream waters to acid deposition, supporting policymaking, targeting integrated prevention and control of atmospheric pollution and forest management.…”

Section: H I G H L I G H T S G R a P H I C Abstractmentioning

confidence: 99%

Effects of acid deposition control in China: a review based on responses of subtropical forests

Xie,

Ge,

Duan

et al. 2024

Front. Environ. Sci. Eng.

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For many decades, acid deposition used to pose a significant regional air pollution challenge in China. After substantial emission control of anthropogenically derived sulfur and nitrogen containing gasses, both sulfur and nitrogen deposition, as well as the acid rain-affected area, have significantly decreased compared to their peak levels. Forests, particularly in the humid subtropics, are sensitive to acid deposition, as evidenced by soil acidification, sulfate and nitrate leaching in stream water, and elevated soil nitrous oxide emission. Reduction in the total deposition of sulfur and nitrogen, caused a significant decline in sulfate and nitrate leaching from subtropical forest and subsequently in sulfate and nitrate concentrations in stream water, although there was about a 5-year delay. This delay may be attributed to the desorption of accumulated sulfate and continued elevated mineralization of accumulated nitrogen pools. Emissions of nitrous oxide, a potent greenhouse gas, also declined in nitrogen-saturated subtropical forest soils, as soil water nitrate concentration decreased. Therefore, subtropical forests in China suffering from elevated acid deposition have begun to recover. Yet, the current levels of sulfur and nitrogen deposition continue to exceed the critical loads, i.e., the assigned threshold levels in accordance with emission control policies, in more than 10% of the country’s land area, respectively, indicating remaining risks of acidification and eutrophication. Thus, further emission reductions are urgently needed, also because they will help achieving goals related to air quality and nitrous oxide emissions.

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Long‐Term ¹⁵N Balance After Single‐Dose Input of ¹⁵N‐Labeled NH₄⁺ and NO₃⁻ in a Subtropical Forest Under Reducing N Deposition

Cited by 24 publications

References 83 publications

Spatiotemporal Characteristics of the Water Quality and Its Multiscale Relationship with Land Use in the Yangtze River Basin

Spatiotemporal Characteristics of the Water Quality and Its Multiscale Relationship with Land Use in the Yangtze River Basin

Evaluation on the Change Characteristics of Ecosystem Service Function in the Northern Xinjiang Based on Land Use Change

Effects of acid deposition control in China: a review based on responses of subtropical forests

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