Dynamics of soil organic carbon and soil fertility affected by alfalfa productivity in a semiarid agro-ecosystem

2006 ◽  
Vol 80 (3) ◽  
pp. 233-243 ◽  
Author(s):  
Yu Jia ◽  
Feng-Min Li ◽  
Xiao-Ling Wang ◽  
Jin-Zhang Xu
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Fertility

WYBRANE ASPEKTY DEGRADACJI GLEB

2019 ◽  
Vol XII ◽  
pp. 1-1
Author(s):  
Monika Jakubus
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Fertility ◽  
Forest Soil ◽  
Soil Degradation ◽  
Renewable Resource ◽  
Carbon Loss ◽  
Temporal Scales ◽  
Spatial And Temporal Scales ◽  
Complex Interactions

The paper presents the problems of various type of forest soil degradations. Soil degradation is characterized by a decline in quality and decrease in ecosystems goods and it is unfavorable phenomenon. Soil is a non-renewable resource and its vulnerability to degradation depends on complex interactions between processes, factors and causes occurring at spatial and temporal scales. Both natural and antropogenic factors and processes are listed as possible causes of soil degradation. Erosion, depletion of the soil organic carbon, loss of soil fertility and biodiversity as well as acidification are particularly fast and noticeable among the major soil degradation processes.

scholarly journals Effect of contrasting crop rotation systems on soil chemical, biochemical properties and plant root growth in organic farming: first results

2017 ◽  
Vol 11 ◽  
Author(s):  
Elga Monaci ◽  
Serena Polverigiani ◽  
Davide Neri ◽  
Michele Bianchelli ◽  
Rodolfo Santilocchi ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Fertility ◽  
Root System ◽  
Organic Farming ◽  
Crop Rotation ◽  
Plant Root ◽  
Biochemical Properties ◽  
Soil Conditions ◽  
Plant Root System

Organic farming is claimed to improve soil fertility. Nonetheless, among organic practices, net C-inputs may largely vary in amount and composition and produce different soil conditions for microbial activity and plant-root system adaptation and development. In this study, we hypothesised that, in the regime of organic agriculture, soil chemical and biochemical properties can substantially differ under contrasting crop rotation systems and produce conditions of soil fertility to which the plant responds through diverse growth and production. The impact of 13 years of Alfalfa-Crop rotation (P-C) and Annual Crop rotation (A-C) was evaluated on the build up of soil organic carbon (SOC), active (light fraction organic matter, LFOM; water soluble organic carbon, WSOC) and humic fraction (fulvic acids carbon, FAC; humic acids carbon, HAC), soil biochemical properties (microbial biomass carbon, MBC; basal respiration, dBR; alkaline phosphatase AmP; arylsulfatase ArS; orto-diphenoloxidase, o-DPO) and the amount of available macro-nutrients (N, P, and S) at two different soil depths (0-10 cm and 10-30 cm) before and after cultivation of wheat. We also studied the response of root morphology, physiology and yield of the plant-root system of wheat. Results showed that the level of soil fertility and plant-root system behaviour substantially differed under the two crop rotation systems investigated here. We observed high efficiency of the P-C soil in the build up of soil organic carbon, as it was 2.9 times higher than that measured in the A-C soil. With the exception of o-DPO, P-C soil always showed a higher level of AmP and ArS activity and an initial lower amount of available P and S. The P-C soil showed higher rootability and promoted thinner roots and higher root density. In the P-C soil conditions, the photosynthesis and yield of durum wheat were also favoured. Finally, cultivation of wheat caused an overall depletion of the accrued fertility of soil, mainly evident in the P-C soil, which maintained a residual higher level of all the chemical and biochemical properties tested.

Effects of mineral and organic fertilizers on soil organic carbon fractions in agricultural chestnut soil

2018 ◽  
Vol 22 (03) ◽  
pp. 103-108
Author(s):  
Enkhtuya D ◽  
Tuul D ◽  
Munkhtsetseg T
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Fertility ◽  
Active Form ◽  
Chestnut Soil ◽  
Organic Fertilizers ◽  
Stable Form ◽  
Organic C

Soil organic matter can be analyzed on the basis of the different fractions. Changes in the levels of organic matter, caused by land use, can be better understood by alterations in the different fractions. Therefore in order to discover tendency of soil fertility sustainability it is significant to research on stable and labile form fractions of soil organic carbon by advanced methodology and modern technique. Our research work aimedto evaluate the effect of mineral and organic fertilizers on the labile and stable organic carbon of the chestnut soil in Mongolia. The soils samples used in this study we collected from variants of mineral (N60P40K40), organic (biohumus 1t / hec.) Fertilizer and their combination of the Long-term fertilizers experiments of Plant and Agriculture Institute Changes in soil organic C by land use for agricultural purposes occurred mainly in the fraction of particulate organic matter (> 20 μm). The clay and silt fractions were quatified with a Mastersizer S after distruction organic substances and carbonates using H2O2 and HCI and the sand fraction was determined by wet sieving. According to our research, the stable form of organic carbon in chestnut soil is 39, 0-40,1% of the total fine particle size and 59, 9-61,0% of the active form fraction. On the other hand, variants with fertilizer tend to have increased stabile composition of soil organic carbon. It indicates that soil fertility protection and increased stability are possible in the country’s agricultural technology if use mineral and organic fertilizers.

scholarly journals Effect of 26 Years of Intensively ManagedCarya cathayensisStands on Soil Organic Carbon and Fertility

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Jiasen Wu ◽  
Jianqin Huang ◽  
Dan Liu ◽  
Jianwu Li ◽  
Jinchi Zhang ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Fertility ◽  
Ph Value ◽  
Organic Fertilizers ◽  
Intensive Management ◽  
Active Organic Matter ◽  
Carya Cathayensis ◽  
Major Nutrients

Chinese hickory (Carya cathayensis), a popular nut food tree species, is mainly distributed in southeastern China. A field study was carried out to investigate the effect of long-term intensive management on fertility of soils under aC.cathayensisforest. Results showed that after 26 years’ intensive management, the soil organic carbon (SOC) content of the A and B horizons reduced by 19% and 14%, respectively. The reduced components of SOC are mainly the alkyl C and O-alkyl C, whereas the aromatic C and carbonyl C remain unchanged. The reduction of active organic matter could result in degradation of soil fertility. The pH value of soil in the A horizon had dropped by 0.7 units on average. The concentrations of the major nutrients also showed a decreasing trend. On average the concentrations of total nitrogen (N), phosphorus (P), and potassium (K) of tested soils dropped by 21.8%, 7.6%, and 13.6%, respectively, in the A horizon. To sustain the soil fertility andC.cathayensisproduction, it is recommended that more organic fertilizers (manures) should be used together with chemical fertilizers. Lime should also be applied to reduce soil acidity.

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