HowelevatedpCO2modi¢es totalandmetabolicallyactive bacterial communities in the rhizosphereoftwoperennial grasses grownunder¢eld conditions

Natural hosts of russian wheat aphid diuraphis noxia (mordvilko)(homoptera: aphididae) in the fars province (iran) and a preference test for the grasses under greenhouse conditions

Changes in Soil Organic Carbon, Nitrogen and Phosphorus in Modified and Native Rangeland Communities (Case study: Sisab Rangelands, Bojnord)

Converting the native rangelands to simplified agronomic communities causessome changes in soil carbon, nitrogen and phosphorus. Establishing of perennial plantcommunities on formerly cultivated rangelands is expected to stabilize soil properties andincrease the amount of C, N, P stored in rangeland soils, but there is little information on whatplant communities are the most effective for impro...

An Efficient Meta Heuristic Algorithm to Solve Economic Load Dispatch Problems

The Economic Load Dispatch (ELD) problems in power generation systems are to reduce the fuel cost by reducing the total cost for the generation of electric power. This paper presents an efficient Modified Firefly Algorithm (MFA), for solving ELD Problem. The main objective of the problems is to minimize the total fuel cost of the generating units having quadratic cost functions subjected to lim...

Relationships between Environmental Factors and Plant Communities in Enclosure Rangelands (Case study: Gonbad, Hamadan)

Exclusion and not using of rangeland in the long term affects the composition and homogeneity of vegetation and consequently leads to the improvement of plants status. In this study, the characteristics and structural changes of the rangeland of Gonbad, Hamadan province, Iran, in 2014 (after 20 years of enclosure) were evaluated using Braun-Blanquet plot, Phytosociology and multivariate analysi...

Positive Effects of Non-Native Grasses on the Growth of a Native Annual in a Southern California Ecosystem

Fire disturbance is considered a major factor in the promotion of non-native plant species. Non-native grasses are adapted to fire and can alter environmental conditions and reduce resource availability in native coastal sage scrub and chaparral communities of southern California. In these communities persistence of non-native grasses following fire can inhibit establishment and growth of woody...