Journal of Range and Watershed Managment

Net Primary Productivity in Kouhdasht, its Spatio-Temporal Patterns and Relation to Meteorological Variables

Document Type : Research Paper

Authors

Moslem Borji Hassan Gavyar 1
Hadi Eskandari Dameneh 2
Hassan Khosravi 3

1 M. Sc. in Watershed Management, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran.

2 PhD Student in Combating Desertification Faculty of Natural Resources, Hormozgan University, Bandar Abbas, I.R. Iran.

3 Assistant Professors, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran.

https://doi.org/10.22059/jrwm.2016.61497
Abstract
Nowadays, temperature increase, rainfall decrease and its effect on the time dynamics of carbon fixation cycle still are faced by many uncertainties. Net Primary Production (NPP) is one of the main factors of carbon cycle; precipitation and temperature measurement are known as two useful tools to study different ecosystems stability and resilience in terms of climate. Hence, in this study, NPP distribution affected by climate parameters of temperature and precipitation have been investigated in four ecosystems of forests, grassland, irrigated agriculture and rain fed agriculture during the period of 2003-2010. Considering climate conditions of biomes, NPP estimation at regional scale was done based on the NASA Moderate Resolution Imaging Spectroradiometer (MODIS) MOD17 NPP product. The results showed that the regression relation was weak between NPP and rainfall for four studied ecosystems, in the other words, low coefficient between these two variables has caused no justified relationship between them. The regression relation between temperature and NPP in forests, pastures and rain-fed agriculture ecosystems follows quadratic equations with determined coefficient over 0.55. The results of this study show that the forest ecosystem resilience to water and temperature tensions is more than other ecosystems, and irrigated agriculture has the least resilience

Keywords

Net Primary Production
Rainfall
temperature
Kuhdasht city
Journal of Range and Watershed Managment
Volume 69, Issue 3
Autumn 2016
Pages 561-574

  • Receive Date 04 August 2015
  • Revise Date 11 January 2017
  • Accept Date 11 April 2016
  • Publish Date 21 November 2016

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