Soil aggregation, aggregate stability, organic carbon and nitrogen in different soil aggregate fractions under forest and shrub vegetation on the Loess Plateau, China

An, Shaoshan; Mentler, Axel; Mayer, H.; Blum, Winfried E. H.

doi:10.1016/j.catena.2010.04.002

Cited by 256 publications

(98 citation statements)

References 30 publications

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“…This may be due to the presence of the lowest amount of SOM, limited microbial activity, and the lowest root biomass, which may play a major role in the formation of soil aggregates and is important for MWD and GMD [41]; similar experiments were conducted, indicating that the MWD of the surface soil layer was higher in grassland compared to cropland. By using the same techniques, our findings are in line with previous studies [2,6,15,42,43]. The removal of plant residue from the soil surface layer and animal grazing are the main causes of the disturbance of soil aggregates [28,44].…”

Section: Mwd and Gmd In Different Land-usessupporting

confidence: 90%

Effects of Different Land-Use Systems on Soil Aggregates: A Case Study of the Loess Plateau (Northern China)

Kalhoro

Chen

et al. 2017

Sustainability

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Soil aggregate stability is an important indicator for controlling soil losses and can improve soil quality, particularly in an area such as the Loess Plateau. The objective of this study was to estimate the differences in soil aggregates across six different land-use systems (grassland, apple orchard, abandoned apple orchard, cropland maize, cropland wheat, and shrub-grassland). For this purpose, dry and wet sieving techniques were employed to assess aggregate content and aggregate stability. Higher percentages of water stable aggregates were observed in the abandoned apple orchard and shrub-grassland at 63% and 61%, respectively. The maximum dry aggregate stability (%) was recorded at 78% and 77% in both wheat cropland and common apple orchard, and the abandoned apple orchard was only 74%. Both mean weight diameters and geometric mean diameters of aggregate were recorded as higher in grassland, shrub-grassland, and the abandoned apple orchard, than the other land uses. The formation of soil aggregates and their stability were positively correlated with soil organic carbon content and root biomass of different plant communities. Higher amounts of soil organic carbon content were noted in the abandoned apple orchard, common apple orchard, and natural grassland at the 0-20 cm soil layer. The results of the correlation coefficient showed a positive significant correlation between the mean weight diameter, geometric diameter, root biomass, and soil organic carbon content. Conclusively, the type of land use affected the soil aggregation and distribution of size fractions; the small fractions of the aggregates formed large fractions by combining with fresh organic matter, and increased soil organic carbon concentrations were closely linked with the formation of macro-aggregates. Thus, converting slope farmland to forestland and grassland could improve water-stable aggregate and reduce soil disturbances in areas (like the Loess Plateau) with the highest erosion risk.

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Section: Mwd and Gmd In Different Land-usessupporting

confidence: 90%

Effects of Different Land-Use Systems on Soil Aggregates: A Case Study of the Loess Plateau (Northern China)

Kalhoro

Chen

et al. 2017

Sustainability

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“…In general, aggregates < 0.053 mm contain the lowest amount of OC stock and coarse aggregates (0.25 -4 mm) contain the highest OC stock. An et al (2010) concluded that in all land uses, coarse aggregates (µ 250 -630 <630 -1000) contained higher amount of the SOC than fine aggregates (µm 63 <63-250 <10-250).…”

Section: Organic Carbon Stocks In Different Aggregatesmentioning

confidence: 99%

Carbon stock and mineral factors controlling soil organic carbon in a climatic gradient, Golestan province

Zeraatpishe

Khormali

2012

J. Soil Sci. Plant Nutr.

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Organic matter content of the many soils is less than 5% by weight; nevertheless this small amount of organic matter (OM) has a significant impact on soil properties. A study to evaluate the role of climate in distribution of organic carbon (OC) and mineral factors (such as soil composition, soil stability and clay minerals) controlling OC was performed. Seven surface soils were collected (0-20 cm depth) with three replications in a climate gradient (200 to 800 mm of rainfall). The results showed that aggregates < 0.053 mm in most of the soils had the lowest organic matter content (Figure 2), and carbon stock increased with increasing in the aggregates size in most soils. There was no significant relationship between OC content and clay mineral content, but there was significant relationship for illite and chlorite. It can therefore be deduced that OC stock is probably controlled mainly by climate factor than clay minerals. Oxalate iron was positively related to OC content, but this relationship does not apply for dithionite iron. The relationship between soil OC content and specific surface area (SSA, g m -2 ) of the soil was positive and significantly correlated. Labile soil OC content had a positive relationship with the climate index (P/ET°). As the index increased the potential loss of OC content increased, as well. Labile OC content was estimated between 0.49 to 16.64 g kg -1 and a potential loss of OC was between 1.28 to 46.12 Mg of carbon per hectare on the soil surface horizon.

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“…A number of studies performed in forests have focused primarily on the conversion of forests to savanna, cropland, or bare fallow land. Most of the results suggested that forest can protect and enhance SOC content and soil aggregate stability [16][17][18][19][20]. Nevertheless, there is a lack of information about the continuous maintenance of forest succession on carbon fractions and soil aggregation.…”

Section: Introductionmentioning

confidence: 99%

Change of Soil Carbon Fractions and Water-Stable Aggregates in a Forest Ecosystem Succession in South China

Xiang

Zhang

2015

Forests

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Soil aggregation, aggregate stability, organic carbon and nitrogen in different soil aggregate fractions under forest and shrub vegetation on the Loess Plateau, China

Cited by 256 publications

References 30 publications

Effects of Different Land-Use Systems on Soil Aggregates: A Case Study of the Loess Plateau (Northern China)

Effects of Different Land-Use Systems on Soil Aggregates: A Case Study of the Loess Plateau (Northern China)

Carbon stock and mineral factors controlling soil organic carbon in a climatic gradient, Golestan province

Change of Soil Carbon Fractions and Water-Stable Aggregates in a Forest Ecosystem Succession in South China

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