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DocumentSoil organic carbon and nutrient availability under Populus deltoides based agroforestry system in semi-arid region of North-West India
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.To achieve biological production on a sustainable basis through the addition of soil organic carbon (SOC) and check land degradation, Populus deltoides is a promising species recognized as an important tree component in agroforestry system (AFS) in the present changing climate. The soil is enriched through the addition of leaf litter in large quantities by this tree, which ultimately improves the fertility in terms of SOC, available N, P and K. However, scanty information is obtainable related to associations between soil properties and poplar based AFS. In this communication, the objective of this study to examine the effect of three old poplar based AFS on soil OC, available N, P and K. The site consisted of six different spacings: i.e. 3×3m, 4×3m, 5×3m, 6×3m, 7×3m and 8×3m of poplar were intercropped with winter wheat, and in adjacent agricultural control plot, where winter wheat was the sole crop (devoid of tree). We quantified soil properties such as soil SOC and available N, P and K at 0-15 cm depth and studied their spatial variability in relation to different spacings of poplar based AFS during 2018-2019. SOC accumulation rates increased with the decrease in tree spacing and were maximum (0.69%) under 3×3 m spacing. The available soil N, P and K increased significantly under different spacings of poplar based AFS in all the treatments from their initial values. The highest available soil N (233.5 kg ha –1 ), P (16.1 kg ha–1) and K (285.3 kg ha–1) were recorded under 3 × 3m spacing compared to 4×3m, 5×3m, 6×3m, 7×3m, 8×3m and sole cropping after harvesting of wheat crop. Keywords: Climate change, Adaptive and integrated management, Research, Agriculture, Deforestation and forest degradation ID: 3486112 -
ArticleFarmer-managed natural regeneration (FMNR) on Nigeria's drylands: the influence of changing climate on agroforestry trees management
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.In Northern Nigeria, prolonged drought critically affects parkland tree regeneration and reduces land productivity and income. However, documentation of parkland trees management in extreme climatic conditions is scarce in the region. Hence, the need to evaluate the management via tree preferences by farmers on Nigeria’s dry agroecological zones (AEZ). To address this, field surveys were conducted in nine villages along a north-south transect, with precipitation increasing southwards through three AEZ of Nigeria: Sudan Savannah (SS), Northern Guinea Savannah (NGS) and Southern Guinea Savannah (SGS). Using Open Data Kit (ODK), information from 92 respondents and 4 focused groups relating to tree regeneration management were collected and aggregated. These include the abundance of the most preferred trees on farms, their regeneration potentials, management and propagation status, as well as usage and land-use constraints. Results showed drought- tolerant species (Parkia biglobosa and Mangifera indica) topped the dominant trees list across the three AEZ, both having 50% more than other agroforestry trees. Though farmers’ management strategies were highly relevant to regeneration and productivity, they did not differ across the zones (P<0.05) except at cropping outside tree canopy cover between SGS and SS using the Kruskal-Wallis test. Positive associations (0.5-0.8) between functions and preference for trees on farms for dominant agroforestry species. Farmers’ adaptation strategy to minimise risk to climate drivers and increase dry forests landscapes resilience made the driest AEZ (SS) had most species on farms and positively impacted the locals' livelihoods. Keywords: Trees, Drought, Farmers, Regeneration, Parklands ID: 3486501 -
ArticleWhy is artificial afforestation crucial for restoring nature? Studies on the dried bottom of Aral Sea, Kazakhstan
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.The Aral Sea, formerly the fourth largest inland lake located in Central Asia, has reduced dramatically as it lost most of its volume due to the large-scale water withdrawal for the cultivation of irrigated crops starting from the 1960s. The desiccated seafloor has become a source of salt, sand, and dust transfer to the adjacent regions, negatively affecting human health and the environment by inhibiting the survival and growth of the vegetation. In response, to stabilize the saline sand blowing from the Aral seabed, multiple domestic and international efforts have been performed to establish vegetation cover with indigenous trees of Haloxylon species as well as other salt- and water-stress tolerant woody and herbaceous plants of the region. As part of the afforestation project supported by the Korea Forest Service (South Korea) in Kazakhstan, field studies examined the impacts of the afforestation on carbon stock and soil quality. The summarized findings are as follows: 1) growth of planted seedlings indicates the measurable sequestration of carbon, which ultimately help to estimate its contribution to climate change mitigation by calculating the atmospheric greenhouse gas reductions; 2) afforestation increased the soil organic matter content which is closely related to soil fertility; 3) afforestation improved soil chemical properties for plants and soil microbes; 4) soil amelioration effects by the afforestation were statistically similar to those by natural vegetation succession. However, the soil conditions in the natural succession area improved after almost 50 years versus about 15 years in the afforested area. This signifies the relative efficiency of afforestation activities and thus helps justify the investments made. Based on the studies, we recommend further research to raise the efficiency of afforestation in arid areas, thereby reinforcing ecosystem restoration and climate change mitigation. Keywords: Aral Sea; afforestation; desertification; climate change; restoration; soil amelioration; carbon stock ID: 3615605
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