Response of labile organic carbon content in surface soil aggregates to short-term nitrogen addition in artificial Pinus tabulaeformis forests

2017 ◽  
Vol 37 (20) ◽  
Author(s):  
姚旭 YAO Xu ◽  
景航 JING Hang ◽  
梁楚涛 LIANG Chutao ◽  
谷利茶 GU Licha ◽  
王国梁 WANG Guoliang ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Surface Soil ◽  
Soil Aggregates ◽  
Nitrogen Addition ◽  
Pinus Tabulaeformis ◽  
Organic Carbon Content ◽  
Short Term ◽  
Labile Organic Carbon

scholarly journals Short-Term Decomposition and Nutrient-Supplying Ability of Sewage Sludge Digestate, Digestate Compost, and Vermicompost on Acidic Sandy and Calcareous Loamy Soils

Agronomy ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2249
Author(s):  
Nikolett Uzinger ◽  
Orsolya Szécsy ◽  
Nóra Szűcs-Vásárhelyi ◽  
István Padra ◽  
Dániel Benjámin Sándor ◽  
...  
Keyword(s):  
Organic Matter ◽  
Sewage Sludge ◽  
Organic Carbon ◽  
Carbon Content ◽  
Plant Biomass ◽  
Test Plant ◽  
Organic Carbon Content ◽  
Short Term ◽  
Mineral N ◽  
Average Residual

Organic waste and the compost and vermicompost derived from it may have different agronomic values, but little work is available on this aspect of sewage sludge. A 75-day pot experiment with perennial ryegrass (Lolium perenne) as the test plant aimed to investigate the fertiliser value and organic matter replenishment capacity of digested sewage sludge (DS) and the compost (COM) and vermicompost (VC) made from it, applied in 1% and 3% doses on acidic sand and calcareous loam. The NPK content and availability, changes in organic carbon content and plant biomass, and the efficiency of the amendments as nitrogen fertilisers were investigated. The final average residual carbon content for DS, COM, and VC was 35 ± 34, 85 ± 46, and 55 ± 46%, respectively. The organic carbon mineralisation rate depended on the soil type. The additives induced significant N mineralisation in both soils: the average increment in mineral N content was 1.7 times the total added N on acidic sand and 4.2 times it on calcareous loam for the 1% dose. The agronomic efficiency of COM and VC as fertilisers was lower than that of DS. In the short term, DS proved to be the best fertiliser, while COM was the best for organic matter replenishment.

Sorption of Metribuzin and Metolachlor in Alaskan Subarctic Agricultural Soils

Weed Science ◽  
1992 ◽  
Vol 40 (1) ◽  
pp. 155-160 ◽  
Author(s):  
Jeff S. Graham ◽  
Jeffery S. Conn
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Soil Type ◽  
Surface Soil ◽  
Agricultural Soils ◽  
Freundlich Isotherm ◽  
Organic Carbon Content ◽  
Surface Soils ◽  
Adsorption And Desorption ◽  
Equilibration Temperature

Adsorption and desorption of metribuzin and metolachlor were studied for 0- to 15- and 30- to 45-cm soil depths and at 5 and 28 C temperatures for two subarctic Alaskan agricultural soils. Surface soils had five to eight times the organic carbon content of deeper soils and had lower Freundlich isotherm slopes (1/n) for both herbicides. Surface soil Freundlich coefficients (Kf) were affected by both soil type and equilibration temperature, with soil type accounting for greater than 80% of the variation in Kf. Surface soil mean Kfvalues ranged from 1.5 to 2.4 for metribuzin and 4.4 to 9.2 for metolachlor. For soils from the 30- to 45-cm depth, neither soil type nor temperature affected Kf. Isotherm slopes for desorption were less than adsorption, indicating hysteresis. Regressions between desorption Kfand maximum herbicide adsorbed prior to desorption were highly significant with coefficients of determination (r2) between 0.50 and 0.99.

Combination of subsurface organic fertilization and film mulching could effectively optimize soil structure in saline alkali soil

2020 ◽  
Author(s):  
Hongyuan Zhang ◽  
Huancheng Pang ◽  
Chuang Lu ◽  
Jing Wang ◽  
Guoli Wang ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Pore Structure ◽  
Carbon Content ◽  
Soil Aggregates ◽  
Soil Layer ◽  
Average Weight ◽  
Organic Carbon Content ◽  
Organic Fertilization ◽  
Plastic Mulching ◽  
Film Mulching

<p><strong>Abstract</strong><strong>：</strong>Saline soil has a serious negative effect on crop growth in the world, subsurface organic fertilizationcombined with plastic film mulching (OMP) is one of the effective measures to solve this issue, which could alleviate salt stress, increase nutrient content and microflora diversity, then furtherly improve crop productivity. However, its impact on soil structure especially soil pore structure has not well documented, so a three-year experiment was conducted to analysis effect of OMP on aggregate distribution and stability, aggregate organic carbon distribution and pore size distribution, during 2015-2017 in Wuyuan Country, Inner Mongolia, China. Four treatments were set in the experiment, including plowing without plastic mulching (CK), plowing plus plastic mulching (PM), subsurface (10–30 cm) treatment with organic manure (OM), and OM plus plastic mulching (OMP). The results showed that in condition of no mulching OM significantly increased the 0.25-2mm aggregates content (18.09%) in 10-30cm soil layer, and significantly increased the organic carbon content of > 2mm (30.79-158.76%) and 0.25-2mm aggregates (161.27-290.94%) in each soil layer compared with CK.In condition of mulching, only OMP can significantly increase the average weight diameter (21.58% for 0-10 cm and 55.95% for 10-30 cm) and the organic carbon content (2.44-94.35% for 0-10 cm and 23.23-215.29% for 10-30 cm) of soil aggregates compared with CK.  Under the condition of subsurface organic fertilization (OM, OMP), the dominant particle size of each soil layer changed from < 0.053 mm aggregate to 0.25-2 mm aggregate, which increased the content of large aggregate and water stability.Compared with OM, the average weight diameter of soil aggregates in 0-10cm and 10-30cm soil layers of OMP increased by 21.58% and 14.36% respectively, but the content of organic carbon in each particle size aggregate in 0-10cm and 10-30cm soil of OMP decreased by 4.24-24.89% and 19.35-40.26% respectively. Furtherly, the large porosity (greater than 30 μm) of 10-30cm and 30-40cm soil layers of OMP increased by 10.52% and 0.71% than that of CK, and the porosity of each equivalent pore size range also increased significantly. Therefore, combination of subsurface organic fertilization and film mulching could effectively optimize soil physical structure by increasing the stability of soil aggregates, maintaining higher organic carbon content, enhancing soil respiration and improving soil pore structure.</p><p><strong>Key words</strong><strong>：</strong>Saline alkali soil; organic fertilizer; soil aggregate; soil pore structure; micro CT</p>

scholarly journals Status of molybdenum in soils of Palghar district of Maharashtra

2019 ◽  
Author(s):  
S. S. Hadole ◽  
R. N. Katkar ◽  
P. A. Sarap ◽  
S. R. Lakhe ◽  
Shamna K. Muhammed
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Negative Correlation ◽  
Surface Soil ◽  
Soil Samples ◽  
Molybdenum Content ◽  
Organic Carbon Content ◽  
Nutrient Index ◽  
Index Value ◽  
Positive Significant Correlation

The surface soil samples representing six tehsils were collected from Palghar district during 2015-16. The available molybdenum content in soil varied from 0.01 to 0.65 mg Kg-1 with nutrient index value was found 1.93. In Palghar district 30 percent soil samples were deficient in available molybdenum. However, positive significant correlation between available molybdenum with pH (r=+0.714**) whereas, significantly negative correlation with organic carbon content (r= -0.815**) was observed.

scholarly journals Characteristics of Soil Aggregates and Its Organic Carbon in Daxing'anling Forest Region

2021 ◽  
Author(s):  
Bing Wang ◽  
Zhiqi Gong ◽  
Qiuliang Zhang
Keyword(s):  
Particle Size ◽  
Organic Carbon ◽  
Carbon Content ◽  
Soil Aggregates ◽  
Soil Aggregate ◽  
Organic Carbon Content ◽  
Spatial Difference ◽  
Structural Factors ◽  
Aggregate Content ◽  
Forest Region

Abstract The distribution and spatial variability of soil aggregates and their organic carbon and their responses to environmental factors in Daxing'anling forest region were studied by field investigation and laboratory analysis. In Daxing'anling forest region, 75 sampling points were set up based on kilometer grid, and the sample circle with radius of 17.85m was set at each sampling point. In each circle, three samples of 0-20 cm topsoil were taken to determine soil chemical indexes, soil aggregates and their organic carbon content. The results showed that: (1) the soil aggregate content followed the order as (0.25~2 mm aggregate) > (<0.053 mm aggregate) > (0.053~0.25 mm aggregate). The spatial autocorrelation of each fraction of aggregate were moderate, and they were affected by the structural factors such as climate, vegetation, soil and random factors such as human activities. The content of 0.25~2 mm and <0.053 mm aggregates decreased gradually from north to south, while the content of 0.053~0.25 mm aggregates was opposite to them. (2) The organic carbon content of soil aggregates was mainly concentrated in the 0.25~2 mm large aggregates (19.84 g/kg) with the contribution rate 50.39%; the organic carbon contents of each fraction of aggregate showed high spatial autocorrelation which was mainly affected by structural factors; the spatial difference of soil aggregate content in each particle size was not significant, and the distribution was patchy. There was no significant spatial difference in the organic carbon contents of soil aggregate in different fractions with patch distribution characteristics. (3) Temperature had no significant effect on the formation and stability of soil aggregates, and precipitation is beneficial to the formation of micro-aggregates <0.053 mm; soil organic carbon was conducive to the cementation of small-sized aggregates into large aggregates, which had a positive effect on the stability of soil aggregates. There was a significant positive correlation between SOC and organic carbon of soil aggregates in different fractions, and the correlation degree was gradually weakened with the decrease of particle size; the contents of soil nitrogen, phosphorus, potassium and other nutrients could promote the organic carbon accumulation in soil aggregates. The results can provide the basis for the soil rational use and the carbon fixation capacity improvement of forest in Daxing'anling forest region.

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