scholarly journals Recent patterns of terrestrial net primary production in africa influenced by multiple environmental changes

2015 ◽  
Vol 1 (5) ◽  
pp. 1-15 ◽  
Author(s):  
Shufen Pan ◽  
Shree R. S. Dangal ◽  
Bo Tao ◽  
Jia Yang ◽  
Hanqin Tian
Keyword(s):  
Primary Production ◽  
Environmental Changes ◽  
Net Primary Production

Simulation of Mediterranean forest carbon pools under expected environmental scenarios

2010 ◽  
Vol 40 (5) ◽  
pp. 850-860 ◽  
Author(s):  
M. Chiesi ◽  
M. Moriondo ◽  
F. Maselli ◽  
L. Gardin ◽  
L. Fibbi ◽  
...  
Keyword(s):  
Primary Production ◽  
Environmental Changes ◽  
Net Primary Production ◽  
Gross Primary Production ◽  
Central Italy ◽  
Forest Carbon ◽  
Simulation Approach ◽  
Two Factors ◽  
Vegetation Carbon ◽  
The Impact

Simulating the effects of possible environmental changes on the forest carbon budget requires the use of calibrated and tested models of ecosystem processes. A recently proposed simulation approach based on the use of the BIOME-BGC model was applied to yield estimates of present carbon fluxes and pools in Tuscany forests (central Italy). After the validation of these estimates against existing ground data, the simulation approach was used to assess the impact of plausible climate changes (+2 °C and increased CO2 concentration) on forest carbon dynamics (gross primary production (GPP), net primary production (NPP), and relevant allocations). The results indicate that the temperature change tends to inhibit all production and allocation processes, which are instead enhanced by the CO2 concentration rise. The combination of the two factors leads to a general increase in both GPP and NPP that is higher for deciduous oaks and chestnut (+30% and 24% for GPP and +42% and 31% for NPP, respectively). Additionally, vegetation carbon is slightly increased, while total soil carbon remains almost unchanged with respect to the present conditions. These findings are analyzed with reference to the Tuscany forest situation and previous studies on the subject.

scholarly journals Dynamic changes of terrestrial net primary production and its feedback to evapotranspiration

2016 ◽  
Author(s):  
Zhi Li ◽  
Yaning Chen ◽  
Yang Wang ◽  
Gonghuan Fang
Keyword(s):  
Primary Production ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Environmental Changes ◽  
Water Cycle ◽  
Net Primary Production ◽  
Positive Trend ◽  
Precipitation Trend ◽  
Vegetation Productivity ◽  
Increased Risk

Abstract. Earth experienced dramatic environmental changes in the recent 15 years (2000–2014). The past decade has been the warmest in the instrumental record, which significantly influences the global water cycle and vegetation activities. Overall, the global inter-annual series of net primary production (NPP) slightly increased in 2000–2014 at a rate of 0.06 PgC/yr2. More than 64 % of vegetated land in the Northern Hemisphere showed increased net primary production, while 60.3 % of vegetated land in the Southern Hemisphere showed decreased trend. Net primary production correlates positively with land actual evapotranspiration (ET), especially in the Northern Hemisphere, where the increased vegetation productivity (0.13 PgC/yr2) promotes decadal rises of terrestrial evapotranspiration (0.61 mm/yr2). However, anomalous dry conditions led to reduced vegetation productivity (−0.18 PgC/yr2) and nearly ceased growth in terrestrial evapotranspiration in the Southern Hemisphere (0.41 mm/yr2). Under the content of past warmest 15 years, global potential evapotranspiration (PET) shows an increasing trend of 1.72 mm/yr2, while precipitation for the domain shows a variability positive trend of 0.84 mm/yr2, which consistent with expected water cycle intensification. But precipitation trend is lower than evaporative demand, indicating some moisture deficit between available water demand and supply for evapotranspiration, thereby accelerated soil moisture loss. Drought indices and precipitation-minus-evaporation suggested an increased risk of drought in the present century. To understand why climates in the northern and southern hemispheres respond differently to NPP, the results showed that temperature is the dominant control on vegetation growth in the high latitude in the Northern Hemisphere, while net radiation is the main effect factors to NPP in the mid latitude, and in arid and semi-arid biomes also mainly driven by precipitation. While in the Southern Hemisphere, NPP decreased because of warming associated drying trends of PDSI.

Responses of CO2 Exchange and Primary Production of the Ecosystem Components to Environmental Changes in a Mountain Peatland

Ecosystems ◽  
2009 ◽  
Vol 12 (4) ◽  
pp. 590-603 ◽  
Author(s):  
D. O. Otieno ◽  
M. Wartinger ◽  
A. Nishiwaki ◽  
M. Z. Hussain ◽  
J. Muhr ◽  
...  
Keyword(s):  
Primary Production ◽  
Environmental Changes ◽  
Co2 Exchange

scholarly journals Quantifying and mapping the human appropriation of net primary production in earth's terrestrial ecosystems

2007 ◽  
Vol 104 (31) ◽  
pp. 12942-12947 ◽  
Author(s):  
H. Haberl ◽  
K. H. Erb ◽  
F. Krausmann ◽  
V. Gaube ◽  
A. Bondeau ◽  
...  
Keyword(s):  
Primary Production ◽  
Net Primary Production ◽  
Terrestrial Ecosystems
Sign in / Sign up

Export Citation Format

Share Document