Effects of Landscape Positions and Landscape Types on Soil Properties and Chlorophyll Content of Citrus in a Sloping Orchard in the Three Gorges Reservoir Area, China

Sun, Siyue; Zhang, Guolin; He, Ting; Song, Shiji; Chu, Xingbiao

doi:10.3390/su13084288

Cited by 7 publications

(4 citation statements)

References 52 publications

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“…The average WHC was 48.6%, 45.8%, 42.8%, and 36.6% in the slight, moderate, severe, and very severe phases, respectively, whereas the average WHC was 53% in the reference site. Therefore, a decrease in WHC with an increase in the severity of erosion may be due to a decline in SOC concentration, as was also reported by Bakker et al [1] and Sun et al [75]. Further, the relative proportion of the coarse fraction increases with an increase in the severity of erosion [48].…”

Section: Data In Tablementioning

confidence: 61%

Impacts of Soil Erosion on Soil Quality and Agricultural Sustainability in the North-Western Himalayan Region of India

et al. 2023

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Erosion by water reduces soil quality and hence crop yield. Understanding the response of crop yields to soil erosion is vital in assessing agriculture’s vulnerability to erosion. However, these effects are difficult to quantify. The study presents a quantitative relationship between soil erosion and soil quality and productivity of rainfed wheat (Triticum aestivum) by comparing field plots with different degrees of erosion in some sub-tropical alfisols in the Doon Valley region of India. By comparing the topsoil depth with the reference site as the control, erosion severity was classified into different phases such as slight, moderate, severe, and very severe. A quantitative, weighted additive model was used to evaluate soil quality for different phases of erosion using soil clay content, water holding capacity, soil aggregate, soil organic carbon, pH, CEC, total N, available P, and available K. The synthesis of long-term experimental data revealed that the mean soil erosion rate varied from 5.5 Mg ha−1 yr−1 in slightly eroded plots to 33.4 Mg ha−1 yr−1 in very severely eroded plots. Compared with the reference forest, the soil organic carbon (SOC) declined by 81.4% and water holding capacity by 31% in severely eroded soils. A substantial loss of total N, extractable P, and available K was also observed. Water stable aggregates (WSA) decreased from 86% to 12.6%, and the cation exchange capacity (CEC) from 25 to 12.6 c mol(+) kg−1. The soil quality index was 0.7 in slightly eroded compared with 0.4 in severely eroded soil. Similarly, the sustainable yield index for wheat was 0.9 and 0.6 for slightly and severely eroded soils, respectively. Thus, there is a strong need to identify land management systems that reduce erosion risks, restore eroded soils, and enhance soil quality.

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Section: Data In Tablementioning

confidence: 61%

Impacts of Soil Erosion on Soil Quality and Agricultural Sustainability in the North-Western Himalayan Region of India

et al. 2023

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Section: Discussionmentioning

confidence: 99%

“…Landscape positions are associated with a range of soil characteristics, which affect the solubility and amount of nutrients available for plant uptake (Singh et al, 2008;Clemens et al, 2010;Bufebo et al, 2021;Sun et al, 2021). Most of these effects are explained by water, particle and nutrient transport downhill, with an accumulation towards the bottom of the slope (Hao et al, 2002;Hu et al, 2019;Sun et al, 2021). General trends of higher CEC, pH, SOC, N, P, K and Zn in footslopes were described for the same region by Amede et al (2020) but in their as well in our study, these trends were not always consistent, most likely because of considerable variability within landscape positions (Desta et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Linking soil adsorption-desorption characteristics with grain zinc concentrations and uptake by teff, wheat and maize in different landscape positions in Ethiopia

Desta,

Broadley,

McGrath

et al. 2023

Front. Agron.

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AimZinc deficiencies are widespread in many soils, limiting crop growth and contributing to Zn deficiencies in human diets. This study aimed at understanding soil factors influencing grain Zn concentrations and uptake of crops grown in different landscape positions in West Amhara, Ethiopia.MethodsOn-farm experiments were conducted in three landscape positions, with five farmers’ fields as replicates in each landscape position, and at three sites. Available Zn from the soil (Mehlich 3, M3, Zn) and applied fertilizer (NET_FERT Zn, estimated based on adsorption/desorption characteristics and applied Zn) were related to the actual grain Zn concentration and uptake of teff, wheat, and maize. Zinc fertilizer treatments tested were Zn applied at planting (basal), basal plus side dressing and a control with no Zn applied.ResultsZn treatments had a significant effect on grain Zn concentration (increase by up to 10%) but the effect on grain yield was variable. Differences in crop Zn concentrations along the landscape positions were observed but not at all sites and crops. Trial results showed that soils with higher soil pH and Soil Organic Carbon (SOC) (typical of footslope landscape positions) tended to adsorb more applied Zn (reduce NET_FERT Zn) than soils with lower soil pH and SOC (typical of upslope landscape positions). Zn availability indicators (M3, NET_FERT Zn, clay%) explained 14-52% of the observed variation in grain Zn concentrations, whereas macronutrient indicators (Total N, exchangeable K) together with M3 Zn were better in predicting grain Zn uptake (16 to 32% explained variability). Maize had the lowest grain Zn concentrations but the highest grain Zn uptake due to high yields.ConclusionWe found that the sum of indigenous and fertilizer Zn significantly affects grain Zn loadings of cereals and that the associated soil parameters differ between and within landscape positions. Therefore, knowledge of soil properties and crop characteristics helps to understand where agronomic biofortification can be effective.

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“…The Three Gorges Reservoir Area [3] is such a region we mentioned. Since the establishment of the Three Gorges Dam, it directly inundated the 682 square kilometers of the valley area and spread to 19 counties and cities with an area of 6 square kilometers.…”

Section: Introductionmentioning

confidence: 99%

An Empirical Study for Real Options of Water Management in the Three Gorges Reservoir Area

Cai

et al. 2021

Sustainability

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This paper investigates an empirical evaluation of water management on agricultural irrigation. To address this problem, a real options model was proposed. This model analysis the choice of investment in water savings. Also, the model discusses a linear complementary problem that can be transformed into the inequalities of parabolic variational. By using a power penalty method, we solved the parabolic variational inequalities. The results depicted that the nonlinear parabolic equations’ solution is converges to the rate of order O(h−k2). A numerical example is given at the end of the paper to demonstrate the theoretical analysis follows from the Three Gorges Reservoir Area.

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Effects of Landscape Positions and Landscape Types on Soil Properties and Chlorophyll Content of Citrus in a Sloping Orchard in the Three Gorges Reservoir Area, China

Cited by 7 publications

References 52 publications

Impacts of Soil Erosion on Soil Quality and Agricultural Sustainability in the North-Western Himalayan Region of India

Impacts of Soil Erosion on Soil Quality and Agricultural Sustainability in the North-Western Himalayan Region of India

Linking soil adsorption-desorption characteristics with grain zinc concentrations and uptake by teff, wheat and maize in different landscape positions in Ethiopia

An Empirical Study for Real Options of Water Management in the Three Gorges Reservoir Area

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