Responses of soil aggregate stability, erodibility and nutrient enrichment to simulated extreme heavy rainfall

Yao, Yufei; Liu, Jiao; Wang, Zhao; Wei, Xiaorong; Zhu, Hansong; Fu, Wei; Shao, Mingan

doi:10.1016/j.scitotenv.2019.136150

Cited by 53 publications

(30 citation statements)

References 51 publications

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“…Soil anti‐scourability is an important indicator to reflect soil erosion resistance, especially on sloping farmland (Zheng et al, 2014b; Zhou et al, 2010). Our study illustrated that AS increased gradually with time (Figure 5), which was in agreement with previous studies (Luo et al, 2019; Xu et al, 2019; Yao et al, 2020). As shown in Figure 4, the decrease of sediment loss with time caused the increase of AS.…”

Section: Discussionsupporting

confidence: 93%

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Temporal variation of soil erosion resistance on sloping farmland during the growth stages of maize (Zea mays L.)

Zheng

et al. 2021

Hydrological Processes

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Maize growth has great effects on soil properties and thus likely induces the changes in soil erosion resistance on sloping farmland. However, temporal variation of soil erosion resistance during the growth stages of maize is still unclear in the mountainous yellow soil area where maize is the dominant crop. In this study, four maize plots (MP) and four bare land plots (CK) were conducted to investigate soil erosion resistance, and multiple indicators of soil erosion resistance were measured including the total soil antiscourability (TAS), mean weight diameter (MWD), soil erodibility K factor and soil shear strength (SH). A comprehensive soil erosion resistance index (CSERI) was employed to quantify the temporal variation of soil erosion resistance during the growth stages of maize (seedling stage, SS; jointing stage, JS; tasselling stage, TS; maturing stage, MS).The results showed that TAS, MWD, SH increased significantly with maize growth and SH decreased when at MS. But K factor decreased significantly over time. CSERI increased significantly during the growth stages of maize and the CSERI of JS, TS, MS increased on average by 74.72, 180.68 and 234.57% than that of SS. Compared to CK, CSERI of MP increased by 49.90, 66.82, 55.60 and 38.61% during the growth stages of maize. The temporal variation of soil erosion resistance was closely related to the changes in maize cover, maize roots and soil organic carbon. The findings demonstrated that it is necessary to consider the temporal variation of soil erosion resistance in the mountainous yellow soil area.

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Section: Discussionsupporting

confidence: 93%

“…However, the fine particles were almost lost with time and more energy was needed to detach and transport soil. Thus, the shift from transport‐limited to detach‐limited regime led to the increase of AS (Shen et al, 2019; Yao et al, 2020). TAS increased significantly with maize growth and TAS of MP is higher than that of CK (Figure 6).…”

Section: Discussionmentioning

confidence: 99%

Temporal variation of soil erosion resistance on sloping farmland during the growth stages of maize (Zea mays L.)

Zheng

et al. 2021

Hydrological Processes

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“…Variations in amino sugars depend on microbial biomass turnover and on the balance between the formation and degradation of microbial residues. After the conversion of grassland to croplands, tillage practices and cultivation (Li et al, 2013; McLauchlan, 2006; Yao et al, 2019) led to great loss of SOC and soil nitrogen (Table 1), which leads to a substrate limitation of soil microorganisms and the subsequent decline in the living microbial biomass and the production of microbial residue (Huang, Liang, Duan, Chen, & Li, 2019). Moreover, the loss of soil nitrogen might facilitate the microbial utilization of amino sugars as an N source because amino sugars are significant fractions of the soil mineralizable N pool (Mengel, 1996).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, after the conversion from grassland to maize cropland, intensive tillage destroys the stability of soil aggregates (Guan, Li, Wang, Mou, & Kuzyakov, 2018) and the physical protection of the amino sugars, which facilitates the release of amino sugars and intensifies the risk of decomposition. Soil erosion, aggregate breakdown and a loss of SOC caused by rainfall (Hao, Wang, Guo, & Hua, 2019; Yao et al, 2019) due to the exposed surface in the maize land could also produce negative effects on the content of amino sugars.…”

Section: Discussionmentioning

confidence: 99%

Loss of soil carbon and nitrogen rather than variations in soil particle size distribution decreased microbial residues during conversion of grassland to croplands

Liang

Zhang

Song

et al. 2021

European J Soil Science

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Conversion of grassland into cropland always induces a great degradation of soil organic carbon (SOC). However, during this process information on microbial residue C (MR‐C) and its contribution to SOC with increasing conversion age remain scarce. The relative contribution of soil properties to the accumulation of amino sugars is still poorly understood. Here, we studied variations in soil amino sugars and MR‐C, and their contribution to SOC with increasing conversion age (5 (M05), 16 (M16) and 34 (M34) years, respectively) from grassland to cropland. In contrast to the contents of glucosamine, fungal glucosamine, galactosamine, muramic acid, total amino sugars and MR‐C in grassland, those in M05 decreased in the range of 14.8–37.5%, and those in M34 decreased in the range of 31.8–65.1%, respectively. The contents of amino sugars and MR‐C did not differ between M16 and M34. The similar contribution of MR‐C to SOC (44.6–46.3%) in grassland, M16 and M34 is likely to result from a balance between microbial and non‐degraded plant residues. Decreasing ratios of fungal to bacterial residue C with conversion age indicated a decreased relative contribution of fungal residues to SOC, which probably resulted from the decreased percentage of macroaggregates. MR‐C and SOC decreased and reached a steady status in a few years (≧16 a) after conversion of grassland to cropland. The redundancy analysis model revealed that total nitrogen (TN), pH, SOC and available nitrogen (AN) played a bigger role than particle size distribution, in terms of explaining the contribution of amino sugars to soil carbon. Highlights Conversion of grassland into cropland decreased amino sugars and microbial residues. The contribution of MR‐C to SOC peaked in M05. The relative contribution of fungal residues to SOC decreased with increasing conversion age. TN and SOC contributed more to the accumulation of amino sugars than particle size distribution.

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“…Some studies have shown that there is a significant positive correlation between maize yield and SOC content ( Xu et al, 2019 ), the latter of which can be directly affected by tillage methods. Reportedly, 90% of SOC exists in the form of aggregates ( Karami et al, 2012 ), and the stability of soil aggregates and SOC contents interact with each other ( Liang et al, 2019 ; Yao et al, 2020 ). However, the relationship between aggregate-associated organic carbon (AOC) contents and crop yields under different tillage methods has rarely been explored.…”

Section: Introductionmentioning

confidence: 99%

Subsoiling increases aggregate-associated organic carbon, dry matter, and maize yield on the North China Plain

Shen

Zhang

Cui

et al. 2021

PeerJ

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Background Soil degradation is one of the main problems in agricultural production and leads to decreases in soil quality and productivity. Improper farming practices speed this process and are therefore not conducive to food security. The North China Plain (NCP) is a key agricultural area that greatly influences food security in China. To explore the effects of different tillage measures on aggregate-associated organic carbon (AOC), the accumulation and transport of dry matter, and maize yield, and to identify the most suitable tillage method for use on the NCP, a field experiment was conducted at Shandong Agricultural University from 2016–2017 using plots that have been farmed using conservation tillage since 2002. Methods In this study, Zhengdan 958 summer maize was used as the test material and undisturbed soil and plant samples were obtained under four tillage methods—no-tillage (NT, tillage depth: 0 cm); rotary tillage (RT, tillage depth: 10 cm); conventional tillage (CT, tillage depth: 20 cm); subsoiling (SS, tillage depth: 40 cm)—which were used to determine the AOC and dry matter contents, as well as the yields of two summer maize growing seasons. Each sample was replicated three times and the AOC content was determined via potassium dichromate oxidation colorimetry. Potassium dichromate oxidized organic carbon in organic matter was employed to reduce hexadecent chromium into green trivalent chromium. Colorimetry was then used to determine the amount of reduced trivalent chromium and calculate the organic matter content. Results The resulting data were statistically analyzed and the results showed that, compared with CT, the AOC contents with NT and SS increased by 5.65% and 9.73%, respectively, while that with RT decreased by 0.12%. Conventional tillage resulted in the highest mean dry matter weight when the maize reached maturity, which was 19.19%, 9.83%, and 3.38% higher than those achieved using NT, RT, and SS, respectively. No significant difference was found between CT and SS treatments, both of which tended to increase the accumulation of dry matter as well as its contribution of assimilates to grain yield post-anthesis. Compared with CT, the mean yield increased at a rate of 0.18% with SS, while yields declined at rates of 17.17% and 11.15 with NT and RT, respectively. The yield with NT was the lowest, though the harvest indices with NT and SS were higher than those with RT and CT. Overall, SS increased the accumulation of dry matter and its contribution of assimilates to grain yields post-anthesis, as well as the AOC content and yields, making it the ideal tillage method for the NCP.

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Responses of soil aggregate stability, erodibility and nutrient enrichment to simulated extreme heavy rainfall

Cited by 53 publications

References 51 publications

Temporal variation of soil erosion resistance on sloping farmland during the growth stages of maize (Zea mays L.)

Temporal variation of soil erosion resistance on sloping farmland during the growth stages of maize (Zea mays L.)

Loss of soil carbon and nitrogen rather than variations in soil particle size distribution decreased microbial residues during conversion of grassland to croplands

Subsoiling increases aggregate-associated organic carbon, dry matter, and maize yield on the North China Plain

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