Crop Susceptibility to Climate Change

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Presentation transcript:

Climate Change Impacts on Agriculture Prepared By : Milan Nepali Josheph

Crop Susceptibility to Climate Change Abiotic effects - Crop development and yield impacted by : temperature changes precipitation changes Biotic effects - impact agricultural productivity : pest pressures availability of pollination services

Climate Change effects on Production Aggregate Effects transcend individual agro-ecosystems: Agriculture is complex system linked to climate by tem., precipitation, solar radiation, and atmospheric gas composition. Soil and water resources are impacted by same issues and represent key components of the system.

Climate Change effects on Soil Resources Soils provide ecosystem services: Nutrient cycling & delivery of nutrients for food and fiber production; Flood mitigation thru filtration and water reservoir Structure to support plants – multi element CO2 sequestration & uptake of GHG in surface and organic layers

Soil erosion effected by CC Studies of field edge effects indicate major factors are: Rainfall: a) intensity – Hi I, short D > Low I, long D b) increase CO2 may lead to plant growth and ground cover – lower splash and higher infiltration, But higher intensity may increases erosion overall.

2) Snow and Winter processes- increased erosion when melt water flows over thawed soil on top of frozen soil. 3) Wind – erosion by wind impacted by velocity, soil moisture content, surface roughness, vegetation.

Changing Production and Effects on Erosion Changes in temperature and ppt. are changing the types of crops planted, dates of planting, harvest and tillage and crop management. Mixed messages with regard to soil erosion – most studies show an increase in soil erosion (decreasing fertility), but the opportunities for increased management coupled with the varying temporal and spatial scales, may result in new models that will more accurately reflect shifts in ecosystem characteristics.

References: Josheph and upadhyaya, 2017. IPM (Integrated Pest Management) Paklihawa, Rupandehi.

The pictures in Presentation belongs completely to author , So any use of picture should be use with the permission of author only.