A Quantitative Analysis of Factors Influencing Organic Matter Concentration in the Topsoil of Black Soil in Northeast China Based on Spatial Heterogeneous Patterns

Du, Zhenbo; Gao, Bingbo; Ou, Cong; Du, Zhenrong; Yang, Jianyu; Batsaikhan, Bayartungalag; Dorjgotov, Battogtokh; Wang, Yun; Zhu, Dehai

doi:10.3390/ijgi10050348

Cited by 37 publications

(27 citation statements)

References 40 publications

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“…Although geodetectors are mainly used for studying the ecological environment and human health, in recent years, they have been gradually used in studies related to heavy metal pollution, karst rocky desertification, soil organic matter, etc. [33][34][35][36]. The geographic detector model is composed of factor detectors, interaction detectors, ecological detectors, and risk detectors.…”

Section: Geodetector Modelmentioning

confidence: 99%

Water Quality Characteristics and Source Analysis of Pollutants in the Maotiao River Basin (SW China)

Jiao

et al. 2022

Water

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Rivers are an important mediator between human activities and the natural environment. They provide multiple functions, including irrigation, transportation, food supply, recreation, and water supply. Therefore, evaluations of water quality and pollution sources are of great significance for ecological restoration and management of rivers. In this study, the improved “vušekriterijumska optimizacija i kompromisno rješenje” (VIKOR in Serbian; in English: Multicriteria Optimization and Compromise Solution), and a geodetector were used to analyze the water quality characteristics and pollution sources of the Maotiao River Basin (Gizhou province, SW China). The results showed that the water quality of the Maotiao River Basin deteriorated significantly during the summer drought period, as was evident in the reservoirs and lakes. It improved in the wet season (i.e., during the summer period) due to runoff dilution. Water quality decreased along the river’s course, from upstream to downstream sections. The results of the geographic detector analysis showed that agricultural areas were the primary factor affecting the spatial distribution of water quality in the river basin. In July, August, and November 2020, the influence of agricultural land was 0.72, 0.60, or 0.80, respectively, and the interactions among urban, industrial, agricultural, and forested areas explained 99.2%, 83.2%, or 99.9% of the spatial differentiation of water quality, respectively. Due to the influence of spatial scale, settlements have a small influence on the spatial distribution of water quality. Their impact factors were 0.38, −0.24, and −0.05, respectively. Notably, the negative relationship of water quality and forested areas reflects that topography, types of landscapes, and soil thickness have considerable influences on the Maotiao River Basin’s water quality. Based on the findings, we infer that good farmland water conservancy projects and comprehensive management of different types of landscapes, such as forests, agriculture, and urban area and water bodies, are of great significance for improving water quality.

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Section: Geodetector Modelmentioning

confidence: 99%

Water Quality Characteristics and Source Analysis of Pollutants in the Maotiao River Basin (SW China)

Jiao

et al. 2022

Water

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“…Adequate supply of P to biota is vital to regulate primary productivity (Vitousek et al., 2010). Black soil is a kind of soil with inherent productivity and high fertility, accounting for about 20% of the arable land and 30% of grain production in China (Du et al., 2021). However, it faces soil fertility deterioration and erosion risk, which hampers agricultural productivity and sustainability (Yang et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Long‐term rice cultivation promoted microbial mineralization of organic P in a black soil

Tong

et al. 2022

Soil Science Soc of Amer J

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Information on the microbiological process in paddy soil is essential to understand phosphorus (P) transformation, due to the special biogeochemical change of P in flooded rice (Oryza sativa L.)‐growing environment. However, relatively few references have been focused on this process in long‐term cultivation of black paddy soil. In this study, we investigated the effect of microbial community and phoD gene on changes in soil P fractions in a black paddy soil. The results showed that, compared with 1‐yr soil, long‐term cultivation (35‐yr rice growth) significantly increased the concentration of soil P pool (P < .05). In detail, the soil available‐P increased from 15.4 to 34.8 mg kg−1, and primary‐P, secondary‐P, occluded‐P and organic‐P increased from 41.4 to 73.6 mg kg−1, 7.60 to 18.9 mg kg−1, 57.6 to 106.1 mg kg−1, and 13.7 to 29.1 mg kg−1, respectively. Notably, the microbial biomass C/P ratio decreased from 190.8 (1‐yr) to 56.2 (35‐yr), indicating that the mineralization of organic P (Po) by microorganisms played a dominant role in long‐term cultivation. The results were further verified by significantly increased soil microorganism concentration, copy number of phoD gene, and strong interaction in phoD‐harboring bacteria. The change of soil P pool was significantly affected by soil properties and phoD gene community through variance partitioning analysis, and Streptomyces and Cupriavidus were the main biomarkers affecting Po mineralization through linear discriminant analysis effect size (LEfSe) analysis. The results will be helpful to understand the microbial process of P transformation (especially for Po) and to guide the management of P fertilizer in black soil area.

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“…Black soil generally refers to Mollisols, which are the fertile soils distributed in four major regions around the world: North America, southeastern Europe, Central Asia, including northeast China, and the Pampas of South America (Durán et al, 2011;Liu et al, 2018a). However, in recent years, the black soil resources have been seriously degraded, the content of soil organic matter has decreased, the soil has hardened, and the degree of salinization has increased (Du et al, 2021;Li et al, 2021). In order to maintain a high grain yield, it is necessary to use a large amount of chemical fertilizers, which results in a large number of residual inorganic salt ions, thus exacerbating the degradation of the soil.…”

Section: Introductionmentioning

confidence: 99%

Alfalfa modified the effects of degraded black soil cultivated land on the soil microbial community

et al. 2022

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Legume alfalfa (Medicago sativa L.) is extensively planted to reduce chemical fertilizer input to the soil and remedy damaged fields. The soil mechanism of these effects is potentially related to the variations in alfalfa-mediated interactions of the soil microbial community. To understand the impact of planting alfalfa on the soil microbial community in degraded black soil cultivated land, a 4-year experiment was conducted in degraded black soil cultivated land. We assessed soil parameters and characterized the functional and compositional diversity of the microbial community by amplicon sequencing that targeted the 16S rDNA gene of bacteria and ITS of fungi in four systems under corn cultivation at the Harbin corn demonstration base (Heilongjiang, China): multiyear corn planting (more than 30 years, MC1); 2 years of alfalfa-corn rotation (OC); 3 years of alfalfa planting (TA); and 4 years of alfalfa planting (FA). It was found out that alfalfa led to changes in the alpha diversity of soil bacteria rather than in fungi in the degraded arable land. The abundance of the bacterial groups Gemmatimonadetes, Actinobacteria, Planctomycetes, and Chloroflexi was increased in OC, while Proteobacteria and Acidobacteria and the fungal group Glomeromycota were increased in TA and FA. OC, TA, and FA significantly increased the pH level but reduced soil electrical conductivity, but they had no impact on soil available nitrogen and soil available potassium at the 0–15 cm soil depth. However, with the years of alfalfa planting, soil available nitrogen and soil available potassium were reduced at the 15–30 cm soil depth. OC, TA, and FA significantly reduced the soil available phosphorus and soil total phosphorus at the 15–30 cm soil depth. There was no significant impact made on soil total nitrogen. FA significantly reduced the soil organic matter at the 15–30 cm soil depth. Planting alfalfa in degraded black soil cultivated land can reduce the salt content of the soil, and the nutrient content of soil planted with alfalfa without fertilization was equivalent to that of degraded corn cultivated land with annual fertilization. Besides, alfalfa recruited and increased contained taxa with the capacity to improve soil nutrient utilization and inhibit the harmful influences of pathogens for subsequent crops. Meanwhile, the planting of alfalfa can modify soil conditions by promoting the proliferation of specific beneficial microbiota groups.

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A Quantitative Analysis of Factors Influencing Organic Matter Concentration in the Topsoil of Black Soil in Northeast China Based on Spatial Heterogeneous Patterns

Cited by 37 publications

References 40 publications

Water Quality Characteristics and Source Analysis of Pollutants in the Maotiao River Basin (SW China)

Water Quality Characteristics and Source Analysis of Pollutants in the Maotiao River Basin (SW China)

Long‐term rice cultivation promoted microbial mineralization of organic P in a black soil

Alfalfa modified the effects of degraded black soil cultivated land on the soil microbial community

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