Temporal and Spatial Variation Characteristics of Water Quality in the Middle and Lower Reaches of the Lijiang River, China and Their Responses to Environmental Factors

Zhu, Dantong; Cheng, Xiangju; Li, Wuhua; Niu, Fujun; Wen, Jianhui

doi:10.3390/ijerph19138089

Cited by 12 publications

(4 citation statements)

References 41 publications

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“…The reason why forest species and individuals in the upstream and downstream of Lijiang River were more abundant than those in the midstream might because the midstream is located in the urban area, hence larger human disturbance will frequently destroy the habitat of the riparian forest community, which was resulting in fewer species and individuals in the midstream riparian zone (Druckenbrod et al 2019). We could also view this from the water quality variation in the middle and lower reaches of the Lijiang River that this area had a strenuous activities from human (Zhu et al 2022). However, we saw the estimated diversity in midstream rises rapidly, compared to the observed diversity.…”

Section: Alpha Diversity Of Karst Forest Along Lijiang Rivermentioning

confidence: 99%

The study of species and phylogenetic diversity on karst forest along Lijiang River

Zhao

Zhou

et al. 2023

Preprint

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Forest community is the key point of global biodiversity conservation for its large number of species. Over the centuries, many scholars have tried to reveal the community diversity of forests such as tropical rainforests. But we know very little about karst forests because it is distributed in very few areas of the world. Lijiang river basin, a subtropical karst forest area, is a vital biodiversity hotspot in South China. In this paper, we aimed to reveal the characteristics of forestry species diversity in the karst area of Lijiang River by Hill diversity and two beta diversity partitioning method. We also studied the phylogenetic diversity and established a pedigree tree for the karst forest in the whole basin. Our findings showed that alpha diversity and beta diversity was quite different between the watershed. The alpha diversity indices in the upper reaches were significantly higher than that of the rest reaches, while the beta diversity was extreme variation among planted forest than natural forest. The decomposition of beta diversity in these karst forests showed that the diffusion limitation was the main driving force causing the beta diversity difference. The phylogenetic structure showed that the midstream karst forest had more distantly related species than other basins. We found that upstream forest was under species invasion while midstream karst forest was under factitious threatened. We suggest that the karst forests in the Lijiang River basin should be protected immediately. This study also filled the gap in the study of karst forests in subtropical regions.

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Section: Alpha Diversity Of Karst Forest Along Lijiang Rivermentioning

confidence: 99%

The study of species and phylogenetic diversity on karst forest along Lijiang River

Zhao

Zhou

et al. 2023

Preprint

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“…Each combination area obtained corresponds to different landscape visual management goals, as shown in Table 11. The SQ, VS, and VAC power were taken as high as level 1 ( 5), medium at level 2 (3 ), and low at level 3 (1 ). VS and SQ are superimposed and then compared with the assessment results of the VAC.…”

Section: Forest Landscape Management and Development Goalsmentioning

confidence: 99%

“…Due to the picturesque karst landscape, Guilin is famous for its beautiful scenery, and the Lijiang River is one of the world's 15 most beautiful rivers for travelers, as selected by Cable News Network (CNN) [2]. Yangshuo Section of Lijiang River Basin (YS of LRB) [3] is the essence of Lijiang River Scenery. The landscape has formed some widely circulated beautiful legends and has certain aesthetic research value.…”

Section: Introductionmentioning

confidence: 99%

GIS-Based Watershed Unit Forest Landscape Visual Quality Assessment in Yangshuo Section of Lijiang River Basin, China

Dong

2022

Sustainability

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The Yangshuo Section of the Lijiang River Basin (YS of LRB) is the essence of the Guilin landscape in China. The typical karst landforms and changing topography form a unique forest landscape in YS of LRB. In order to reveal the visual quality of itse forest landscape, this research used GIS spatial analysis technology combined with Analytic Hierarchy Process (AHP), the assessment factors were leveled and assigned, and some abstract assessment indicators in the visual quality assessment were quantified. Three primary indicators of forest landscape visual quality (FLVQ) assessment in YS of LRB, including Scenic Quality (SQ), Visual Sensitivity (VS), and Visual Absorption Capability (VAC), are proposed. Visual assessment units are divided based on the watershed, and a process and framework for the comprehensive assessment of FLVQ was established at the watershed scale. The results show that the FLVQ in YS of LRB is generally at a low level. The area percentage of FLVQ at high (13′&11′), medium (9′) and low (7′&5′) levels are 10.95%, 29.67% and 59.38%, respectively. The comprehensive score of FLVQ in the karst area is slightly lower than that in the non-karst area, but the karst area of the units with the highest FLVQ accounts for 99.58% of the FLVQ of karst areas along the Lijiang River distributed in the Lijiang River Scenic Area, greater than that of any other areas. The FLVQ in regions with high vegetation coverage and large topographic changes is relatively higher. Slope, relief amplitude, and vegetation richness directly affect the visual quality of forest landscape. Under the influence of local scenic area protection policies and relatively stable natural climate, the FLVQ in YS of LRB has maintained a stable level in the past 20 years. The areas with low FLVQ are mainly cultivated land and construction land, which have low vegetation coverage and no obvious change in terrain. Based on the comprehensive assessment results of FLVQ in YS of LRB, the management goals and future development suitability of forest landscape is discussed. This research proposes appropriate construction and management strategies for forest landscape structures. The results are helpful for providing a scientific research basis for forest landscape resource conservation, landscape site selection, and forest ecotourism development in the Karst landscape area. The impact of human disturbance on the forest landscape fragmentation and the growth characteristics of forests under different landforms are the focus of future FLVQ research on similar areas.

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“…For example, the enhancement of hydrodynamic conditions can accelerate the migration efficiency of TN and TP [ 30 , 31 ]. In addition, as the major contributor, human activities comprising fertilizer usage in farmland and point sources can significantly increase the concentration of TN and TP in soil and aquatic systems [ 32 , 33 ]. Furthermore, the watershed will determine the total amount of fixed N and P of plants [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Rainfall on Aquatic Nitrogen and Phosphorus in a Semi-Humid Area Catchment, Northern China

Shou

Tian

Zeng

et al. 2022

IJERPH

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The impact of rainfall on water quality may be more important in semi-arid regions, where rainfall is concentrated over a couple of months. To explore the impact of rainfall changes on water quality, e.g., nitrogen (TN) and phosphorous (TP), the diversion from Luan River to Tianjin Watershed in the northern semi-humid area was selected as the study area. TN and TP concentrations in rivers and the Yuqiao Reservoir during the three-year high-flow season (2019–2021) were analyzed. The response relationship and influencing factors among the watershed’s biogeochemical process, rainfall, and water quality were clarified. The results showed that rainfall in the high flow season mainly controlled the river flow. The concentration of TN and TP in the inflow rivers is regulated by rainfall/flow, while the concentration of TN and TP in the water diversion river has different variation characteristics in the water diversion period and other periods. The lowest annual concentrations of TN and TP were observed in the normal year, while the highest annual concentration was observed in the wet year, indicating that the hydrological process drove the nutrient transport in the watershed. For the tributaries, the Li River catchment contributed a large amount of N and P to the aquatic environment. For the reservoir, the extreme TN concentrations were the same as the tributaries, while the extremes of TP concentrations decreased from the dry year to wet year, which was in contrast to the tributaries. The spatial variation of TN and TP concentrations in the reservoir showed that the concentration decreased following the flow direction from the river estuary to the reservoir outlet. Considering climate change, with the increase of rainfall in North China in the future, the TN and TP transport fluxes in the watershed may continue to increase, leading to the nitrogen and phosphorus load of the downstream reservoir. To ensure the impact of the increase of potential N and P output fluxes in the watershed on the water quality of the reservoir area, it is necessary to strengthen the effective prevention and control of non-point source pollution in the watershed.

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Temporal and Spatial Variation Characteristics of Water Quality in the Middle and Lower Reaches of the Lijiang River, China and Their Responses to Environmental Factors

Cited by 12 publications

References 41 publications

The study of species and phylogenetic diversity on karst forest along Lijiang River

The study of species and phylogenetic diversity on karst forest along Lijiang River

GIS-Based Watershed Unit Forest Landscape Visual Quality Assessment in Yangshuo Section of Lijiang River Basin, China

The Effect of Rainfall on Aquatic Nitrogen and Phosphorus in a Semi-Humid Area Catchment, Northern China

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