scholarly journals Sediment organic matter and physicochemical properties of a multipurpose artificial lake to assess catchment land use: a case study of Kaptai lake, Bangladesh

2021 ◽  
Vol 3 ◽  
pp. 100070
Author(s):  
Md. Enamul Hoque ◽  
Mazharul Islam ◽  
Shyamal Karmakar ◽  
Md. Atiqur Rahman ◽  
Md. Simul Bhuyan
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Physicochemical Properties ◽  
Sediment Organic Matter ◽  
Artificial Lake

scholarly journals The Effect of Land Use Systems on Soil Properties; A case study from Rwanda

2018 ◽  
Vol 7 (2) ◽  
pp. 30 ◽  
Author(s):  
Theobald Bizuhoraho ◽  
Alexis Kayiranga ◽  
Noel Manirakiza ◽  
Khaldoon A. Mourad
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Land Use Change ◽  
Physicochemical Properties ◽  
Bulk Density ◽  
Sustainable Land Use ◽  
Available Phosphorus ◽  
Cultivated Land ◽  
Exchangeable Potassium ◽  
Available Nitrogen

Land use change has a significant impact on the ecosystem. In this paper the effects of land use change on the physicochemical properties of the soil in Rulindo District, Rwanda have been studied. Three different land use types were selected; forestland, cattle farmland and cultivated land. A randomised complete block research design was used to carry out this research. Nine soil samples were collected and then analysed. The distributed samples were analysed in the Soil Laboratory of University of Rwanda-Busogo campus, while the undisturbed samples were analysed in-situ. Eight physicochemical properties were measured: pH, Organic Matter (OM), available nitrogen, available phosphorus, exchangeable potassium, soil bulk density, moisture content and porosity. The results showed that changing land use from forest or farm to cultivated land reduced the organic matter, available nitrogen, soil moisture and porosity while bulk density and pH were significantly increasing. On the other hand, the exchangeable potassium and exchangeable phosphorus did not change significantly for the both land use changes. Hence, the reduction of forestland and farmland are highly sensible to erosion and will decline soil fertility. The paper proposed few steps and recommendations to be the base for a new sustainable land use management in Rwanda.

scholarly journals Spatial-Temporal Variability of Soil Organic Matter in Urban Fringe over 30 Years: A Case Study in Northeast China

2019 ◽  
Vol 17 (1) ◽  
pp. 292
Author(s):  
Hongbin Liu ◽  
Shunting Li ◽  
Yuepeng Zhou
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Temporal Variation ◽  
Household Survey ◽  
Urban Fringe ◽  
Organic Fertilizers ◽  
Agricultural Planning ◽  
Study Sites

The study on soil organic matter (SOM) is of great importance to regional cultivated land use and protection. Based on data collected via continuous and high-density soil samples (0–20 cm) and socio-economic data collected from household survey and local bureau of statistics, this study employs geostatistics and economic statistical methods to investigate the spatial-temporal variation of SOM contents during 1980–2010 in the urban fringe of Sujiatun district in Shenyang City, China. We find that: (1) as to temporal variation, SOM contents in the study sites decreased from 30.88 g/kg in 1980 to 22.63 g/kg in 2000. It further declined to 20.07 g/kg in 2010; (2) in terms of spatial variation, the closer to city center, the more decline of SOM contents. Contrarily, SOM contents could even rise in outer suburb area; and (3) SOM content variation may be closely related to human factors such as farmers’ land use target and behaviour including inputs of chemical and organic fertilizers, types of crops and etc. These findings are conductive to grasp the overall trend of SOM variation and the influence of farmers’ land use behaviour on it. Furthermore, they could provide support for policymakers to agricultural planning and land use monitoring, which consequently aids the improvement of soil quality and food production in the urban fringe areas.

scholarly journals Response Mechanism of Sediment Organic Matter of Plateau Lakes in Cold and Arid Regions to Climate Change: a Case Study of Hulun Lake, China

2021 ◽  
Author(s):  
Wenwen Wang ◽  
Li Zhao ◽  
Wei Li ◽  
Junyi Chen ◽  
Shuhang Wang
Keyword(s):  
Climate Change ◽  
Organic Matter ◽  
Feedback Mechanism ◽  
Sediment Organic Matter ◽  
Sedimentary Evolution ◽  
Terrestrial Source ◽  
Nitrogen Ratio ◽  
Hulun Lake ◽  
Extractable Organic Matter

Abstract Lake organic matter is one of the important forms of terrestrial carbon, and its sedimentary evolution is affected by many factors such as climate and source. However, few studies have been conducted on the bidirectional feedback mechanism between the sedimentary evolution of organic matter and climate change in cold and arid lakes. Historical variations of the sediment organic matter (SOM) and source construction of Hulun Lake, a typical lake in the cold and arid region of China, were studied by multiple methods. The interactions and feedback mechanisms between the sedimentary evolution, climate change, and source construction change were also discussed. Overall, the characteristic indexes of the SOM showed obvious and uniform characteristics of periodical changes. The indexes were relatively stable before 1920, and fluctuated from 1920 to 1979. Since the 1980s, the total organic carbon, carbon stable isotope, and fluorescence intensity of the protein-like component in the water extractable organic matter in the SOM has increased, while the carbon to nitrogen ratio decreased. The absolute dominant contribution of terrestrial source to the SOM had changed, and the relative average contribution rate of autochthonous source increased from 17.6% before 1920 to 36.9% after 2000. The increase of temperature, strong evaporation concentration effect, and the source construction change are the important driving factors of the sedimentary evolution of organic matter in Hulun Lake.

scholarly journals Soil Organic Matter Alteration Velocity due to Land-Use Change: A Case Study under Conservation Agriculture

2018 ◽  
Vol 10 (4) ◽  
pp. 943 ◽  
Author(s):  
Ádám Rieder ◽  
Balázs Madarász ◽  
Judit Szabó ◽  
Dóra Zacháry ◽  
Anna Vancsik ◽  
...  
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Land Use Change ◽  
Conservation Agriculture

scholarly journals Impact of Different Land-Use Systems on Soil Physicochemical Properties and Macrofauna Abundance in the Humid Tropics of Cameroon

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Lawrence Tatanah Nanganoa ◽  
Justin Nambangia Okolle ◽  
Valentine Missi ◽  
Jacques Roberto Tueche ◽  
Lewis Dopgima Levai ◽  
...  
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Physicochemical Properties ◽  
Humid Tropics ◽  
The Other ◽  
Plant Residues ◽  
Soil Physicochemical Properties ◽  
Land Use Systems ◽  
Land Use Types ◽  
The Impact

The impact of different land-use systems on some soil physicochemical properties and macrofauna abundance in the humid tropics of Cameroon was studied. The land-use types included secondary forest (SF), oil palm plantation (PP), banana plantation (BP), sugarcane plantation (SP), and rubber plantation (RP). Soil particle size distribution, bulk density (BD), pH, organic matter (OM), and number of macrofauna were evaluated. The results showed that OM and number of macrofauna were higher in the SF than in the other land-use types. Pearson’s correlation analysis carried out to determine the relationship between OM and BD showed that OM and BD was strongly negatively related with correlation coefficient of −0.9653. It also showed a strong significant negative correlation between BD and ants population (r = −0.8828) and between soil pH and number of earthworms (r = −0.9072). Based on the results, the SF produced more organic matter and higher number of macrofauna. However, the OM of the other land uses was not low; hence, it could be beneficial to return plant residues to the field for maintaining soil quality.

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