caa a22 4500 463218213 CHVBK 20180405153204.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s11056-007-9040-0 doi (NATIONALLICENCE)springer-10.1007/s11056-007-9040-0 Seed rain of ponderosa pine beneath partial overstories [Elektronische Daten] [Christopher Keyes, Douglas Maguire] An analysis was conducted of the 1999 ponderosa pine (Pinus ponderosa var. ponderosa Dougl. ex Laws.) seed crop at two stands of differing overstory density in each of two sites that differed in productivity (forest community series) on the east slope of the Cascade Range in central Oregon, USA. A total 2,166 viable seeds were collected between 2 September 1999 and 6 June 2000. Total seed quantities varied more by site than by tree density, with the xeric site producing six-fold greater seed yields. Within each site, the stand of higher density produced more viable seed. Per-tree cone yields were also greater at the site of lesser productivity. At three of the four stands, tree fecundity (as measured by cone counts) was positively related to diameter at breast height and height, but not to live crown ratio. A difference in temporal seedfall patterns among the two sites occurred late and was relatively minor: most seedfall occurred within the first month after it started regardless of absolute seed production. Seedfall distribution varied spatially within stands, but no seed trap (of 55) received less than an equivalent 28 thousand seeds per hectare. Seedfall was not perceived to be a limiting factor on natural regeneration at any of the four partial-overstory stands in this study. Springer Science+Business Media, Inc., 2007 Pinus ponderosa nationallicence Natural regeneration nationallicence Seedfall nationallicence Green tree retention nationallicence Variable retention harvest nationallicence Seedling recruitment nationallicence Disturbance nationallicence Keyes Christopher Department of Forestry & Watershed Management, Humboldt State University, 95521, Arcata, CA, USA aut Maguire Douglas Department of Forest Science, Oregon State University, 97331, Corvallis, OR, USA aut New Forests Kluwer Academic Publishers 34/2(2007-09-01), 107-114 0169-4286 34:2<107 2007 34 11056 https://doi.org/10.1007/s11056-007-9040-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11056-007-9040-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Keyes Christopher Department of Forestry & Watershed Management, Humboldt State University, 95521, Arcata, CA, USA aut NATIONALLICENCE 700 1- Maguire Douglas Department of Forest Science, Oregon State University, 97331, Corvallis, OR, USA aut NATIONALLICENCE 773 0- New Forests Kluwer Academic Publishers 34/2(2007-09-01), 107-114 0169-4286 34:2<107 2007 34 11056 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer