Change in the trade‐off between aboveground and belowground biomass of alpine grassland: Implications for the land degradation process

2019 ◽  
Vol 31 (1) ◽  
pp. 105-117 ◽  
Author(s):  
Fei Peng ◽  
Xian Xue ◽  
Quangang You ◽  
Jian Sun ◽  
Jun Zhou ◽  
...  



2017 ◽  
Vol 141 (3-4) ◽  
pp. 123-130
Author(s):  
Ali Durkaya ◽  
Sinan Kaptan ◽  
Ali Sabanci ◽  
Birsen Durkaya

This study was carried out on the data obtained from 35 plot areas selected among the vertical distribution regions of maquis in study area located in Eastern Mediterranean region. The data were grouped in terms of altitude, dominant exposure, vegetation height, and mean age factors, and it is tried to reveal the change of maquis biomass depending on these factors. The data obtained shown significant variation and, for this reason, the mass values are expressed as mean values. The potential relationship between the mentioned factors and the amounts of stored biomass was examined by using t-test and variation analysis. The mean aboveground biomass amount was found to be 24,183 ton/ha, while mean belowground biomass that doesn’t contain fine root was found to be 41,062 ton/ha. According to these results obtained from mean values, the root/shoot ratio was calculated to be 1.7.



Oecologia ◽  
2008 ◽  
Vol 158 (2) ◽  
pp. 285-298 ◽  
Author(s):  
Giuseppe Di Carlo ◽  
W. Judson Kenworthy




Siembra ◽  
2020 ◽  
Vol 7 (2) ◽  
pp. 057-068
Author(s):  
Pedro Manuel Villa ◽  
Lina Sarmiento ◽  
Fermín JR Rada ◽  
Alice Cristina Rodrigues ◽  
Nelson Márquez ◽  
...  

Nitrogen nutrition considerably influences the process of growing and producing potato crops. The aim of this study was to determine the effects of nitrogen nutrition on the pattern of biomass and nitrogen partitioning during the growth of potato crop in Mérida, Mérida, Venezuela. Experimental land plots were set, with a randomized blocks design, and with three different fertilization treatment settings for the "Granola" cultivar. The first one without nitrogen (0-N), the next one with 133 Kg N Ha-1 (133-N), and the last one with 400 Kg N Ha-1 (400-N). In the main phenological stages of the crop, biomass and nitrogen levels were measured for each organ. The performance of the tubers and the total biomass are strongly influenced by the availability of nitrogen and assimilatory biomass. The total biomass production, as well as the biomass and nitrogen partitioning to each organ, showed the following sequence: 400-N > 133-N > 0-N. However, biomass and nitrogen partitioning to the roots and stolons was higher in the treatment with limited nitrogen levels. Proportional changes among aboveground and belowground biomass are adaptive responses to nitrogen deficit conditions, which, in their turn, are determining factors in crop production.



2015 ◽  
Vol 9 (2) ◽  
pp. 73-86
Author(s):  
Remus Prăvălie

AbstractLand degradation is presently an important environmental issue in many regions of the Globe, including Central South-Eastern Europe, where Romania is located. This study aims to quantify areas with significant sensitivity to degradation at national level, based on data provided by the European Environment Agency, obtained relatively recently through the DISMED project (Desertification Information System for the Mediterranean) in the Mediterranean and Central South-Eastern regions of Europe. The analysis is based on extracting SDI index (Desertification Sensitivity Index) information for the country’s entire territory, as well as for certain major regional, natural (landforms) and anthropogenic (counties) units. Thus, the areas corresponding to the most representative classes for land degradation potential in Romania were extracted, i.e. the ones with moderate and high sensitivity. The study also attempts to differentiate the degradation / desertification processes spatially, by delimiting drylands, for which the land degradation process is considered to be equivalent to desertification. The results showed that, at national level, there are ~ 72 000 km2 of lands with moderate and high degradation potential (30% of the country’s total surface), of which 80% (~ 57 000 km2) can be classified as sensitive to desertification. It was noticed that most degradation-prone areas are concentrated in the Romanian Plain (~ 30000 km2 moderate sensitivity) and the Dobrogea Plateau (~ 4150 km2 high sensitivity), in terms of the natural criterion, and in Braila (~ 4200 km2 moderate sensitivity) and Constanta (~ 3200 km2 high sensitivity) counties, in terms of the anthropogenic one. It was also found that land degradation in these areas corresponds to desertification, considering the existence of dry sub-humid and semi-arid climates, which are components of dryland systems.



OALib ◽  
2019 ◽  
Vol 06 (08) ◽  
pp. 1-12
Author(s):  
Habeeb Ajibola Yusuf ◽  
Jesumbo Joseph Oludipe ◽  
Oluwatoyin Olajumoke Adeoye ◽  
Idowu Ezekiel Olorunfemi


Sign in / Sign up

Export Citation Format

Share Document