ABSTRACT
The research was on the
impact of Agricultural ecosystem on available carbon stock and soil water
storage for irrigation management and climate change mitigation. A free survey
method approach was used in the selection of sampling sites which covered six
different land uses. These includes; virgin forest (VF), that is untilled
forest, Afforestation Forest (AF), Grassland (GL), continuous cultivated land
(CCL), cattle transient (CT) and Uncultivated land (UCL). The sampling sites
were geo-referenced with the aid of Global Positioning System (GPS) technology
to obtain the study co-ordinates. Disturbed soil samples at 0-30 cm, 30-60 cm and 60-90
cm depths were collected in both rainy and dry seasons from each of the six
different ecosystems for laboratory analysis. Data collected includes particle
size distribution, Soil bulk density, soil porosity, organic
carbon, Net Carbon flux, soil moisture retention, Aggregate stability and
structural stability index. Modeling and optimization of net carbon flux and
organic carbon stock variation with seasons and soil moisture retention
Agricultural practices were conducted using response surface method. Data
collected were analyzed using ANOVA, correlation coefficient. The result
obtained from the ANOVA suggested that for all the ecosystems, there was
significant variations in soil moisture content at 0.01% for the depths
considered. The highest values were recorded at 0-30 cm depth in rainy season
and 60-90 cm depth in dry season. Agricultural practices significantly (P ≤
0.05) influenced the organic carbon (OC) and total nitrogen (TN) content of the
soils which were higher under natural undisturbed forestation land (VF) when
compared with other agricultural practices in both seasons. Least values of OC
and TN status of the site studies were obtained under continuously-cropped land
(CCL) in raining season (2.50 gkg-1 for OC and 0.31 gkg-1
for TN) and dry season (3.57 gkg-1 for OC and 0.39 gkg-1
for TN). Also, in both seasons, no significant (P ≤ 0.05) difference was
recorded between CT and GRL effect on OC whereas reverse was the case for TN.
The lowest carbon stocks in the study sites were found in soils under CCL, CT
and GRL which were 31.31, 34.98 and 33.39 Mgm-3 for
raining season and 38.28, 43.32 and 45.22 Mgm-3 for dry season,
respectively. Highest values of CO2 were recorded in CCL (4.96 % for
rainy season and 7.77% for dry season) which was difference form those recorded
in NUEFL by 78.02 % and AF by 69.56 % under raining season. Whereas, under dry
season CCL recorded higher value of CO2 than those obtained for VF
(74.26 %) and AF by 72. 20 %. Values of
Net C flux were consistently negative and significantly lower in soils under
CCL (-22.35 and -23.31) for rainy season. This shows that natural undisturbed
forestation land (NUFL) and afforestation
plantation (AFP) practices enhanced vegetation cover which
improves sequestration of carbon flux as well as other soil properties and
place soils of the study areas at a lower risk of degradation and climate
change effect.
EZEJIOFOR, E (2024). Impact of Agricultural Ecosystem on available Carbon Stock and Soil Water Storage for Irrigation Management and Climate Change Mitigation:- Ezejiofor, Nkeiruka R.. Repository.mouau.edu.ng: Retrieved Oct 12, 2024, from https://repository.mouau.edu.ng/work/view/impact-of-agricultural-ecosystem-on-available-carbon-stock-and-soil-water-storage-for-irrigation-management-and-climate-change-mitigation-ezejiofor-nkeiruka-r-7-2
EZEJIOFOR, EZEJIOFOR. "Impact of Agricultural Ecosystem on available Carbon Stock and Soil Water Storage for Irrigation Management and Climate Change Mitigation:- Ezejiofor, Nkeiruka R." Repository.mouau.edu.ng. Repository.mouau.edu.ng, 16 Apr. 2024, https://repository.mouau.edu.ng/work/view/impact-of-agricultural-ecosystem-on-available-carbon-stock-and-soil-water-storage-for-irrigation-management-and-climate-change-mitigation-ezejiofor-nkeiruka-r-7-2. Accessed 12 Oct. 2024.
EZEJIOFOR, EZEJIOFOR. "Impact of Agricultural Ecosystem on available Carbon Stock and Soil Water Storage for Irrigation Management and Climate Change Mitigation:- Ezejiofor, Nkeiruka R.". Repository.mouau.edu.ng, Repository.mouau.edu.ng, 16 Apr. 2024. Web. 12 Oct. 2024. < https://repository.mouau.edu.ng/work/view/impact-of-agricultural-ecosystem-on-available-carbon-stock-and-soil-water-storage-for-irrigation-management-and-climate-change-mitigation-ezejiofor-nkeiruka-r-7-2 >.
EZEJIOFOR, EZEJIOFOR. "Impact of Agricultural Ecosystem on available Carbon Stock and Soil Water Storage for Irrigation Management and Climate Change Mitigation:- Ezejiofor, Nkeiruka R." Repository.mouau.edu.ng (2024). Accessed 12 Oct. 2024. https://repository.mouau.edu.ng/work/view/impact-of-agricultural-ecosystem-on-available-carbon-stock-and-soil-water-storage-for-irrigation-management-and-climate-change-mitigation-ezejiofor-nkeiruka-r-7-2