The effects of clipping on production of two range species (Agropyron elongatum (Host) Beauv., and Festuca ovina L.)
M. Mohammad , Esmaeili , H. Kheirfam , M. Deilam , M. Akbarlo , H. Sabouri
We studied the effects of shoot clipping frequency on biomass production, biomass allocation and shoot number on two range species (Agropyron elongatum (Host) Beauv., and Festuca ovina L.). Plants were grown during a 15-week experiment in experimental garden. The above ground parts were clipped at a height of 7 cm following four treatments: frequent (every one week), moderate (every two weeks), low (every four weeks) and unclipped (control). Total biomass and root mass of A. elongatum were reduced by frequent defoliation until 40% whereas F. ovina maintained a similar production for two plant components (above-ground and roots biomass) when clipped. The latter one was able to compensate for the biomass loss even after five consecutive clippings. The changes in biomass production patterns of A. elongatum were accompanied with variations in biomass allocations. Biomass allocated to roots was significantly lower for A. elongatum in clipped plants than in control plants. The shoot mass and root mass fraction of F. ovina were similar among clipping treatments. Shoot number was significantly increased until 30% for A. elongatum and F. ovina in clipped plants than in control plants. Finally, in the experimental conditions, F. ovina was the most tolerant species to clipping, while A. elongatum showed moderate tolerance.
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The Changes in Aggregates due to the Use of Biochar Obtained from Populus Nigra Branches
Gilda Moafi, Leila Gholami*, Ataollah Kavian,
Iranian Journal of Watershed Management Science and Engineering, -
The possibility of establishment of cyanobacterial biocrusts in the saline soil of Lake Urmia bed
Azam Mumzaei, *, Seyed Hamidreza Sadeghi
Water and Soil Conservation,