Abstract Between the nineteenth and early twentieth centuries, large-scale afforestation projects were undertaken in Swiss Prealps. The stone pine ( Pinus cembra L.), an emblematic alpine tree with important economic potential, conservation value ecological relevance, was one of species used these efforts. We investigated distribution site characteristics all known natural populations planted s...

Seed production of shortleafpine (Pinus echinata Mill.) was monitoredfrorn 1965 to 1974 to determine the periodicily qf seed crops in both woods-run stands and seed-production areas. One bumper and two good seed crops occurred during the 9-yrperiod. The two largest crops occurred in successive years, then seedproduction was lowfor4 yr before another good crop occurred. Mean annual seedproductio...

the effects of dominant shrub species on soil organic matter (som), including total soil carbon (sc), total nitrogen (n) and particulate organic matter (pom) were studied in three stands differing in the type of shrub species, i.e. astragalus microcephalus (shrub), pteropyrum aucheri (shrub) and prangus uloptera (non-shrub).the stands were located in arid grasslands of north-western iran. for t...

BACKGROUND Restoration of degraded forest ecosystem is crucial for regional sustainable development. To protect the country's fragile and fragmented environment, the Chinese government initiated an ecological engineering project, the Natural Forest Protection Program, in seventeen provinces in China beginning in 1998. Fully hillside-closed forest protection (vegetation restoration naturally wit...

the goal of this study was to survey the natural vegetation on waste landfills and suggest arestoration plan. in the study, i identified 63 families, 275 species, and 34 varieties of aboveground vascular flora. robinia pseudo-acacia was the dominant tree, with a basal area density of 1.51¡3/ha, followed in decreasing order by salix koreensis and populus sieboldii. twinspan resulted in the class...