| climatic and stream-flow controls on tree growth in a western montane riparian forest. | humans have severely impacted riparian ecosystems through water diversions, impoundments, and consumptive uses. effective management of these important areas is becoming an increasingly high priority of land managers, particularly as municipal, industrial, and recreational demands for water increase. we examined radial tree growth of four riparian tree species ( pinus jeffreyi, populus trichocarpa, betula occidentalis, and pinus monophylla) along bishop creek, california, and developed models re ... | 2002 | 12375088 |
| effectiveness of six species of rodents as dispersers of singleleaf piñon pine (pinus monophylla). | the effectiveness of six species of rodents as dispersers of singleleaf piñon pine (pinus monophylla) was investigated in field enclosures. the rodent species were panamint kangaroo rat (dipodomys panamintinus), great basin pocket mouse (perognathus parvus), pinyon mouse (peromyscus truei), deer mouse (peromyscus maniculatus), least chipmunk (tamias minimus), and white-tailed antelope ground squirrel (ammospermophilus leucurus). five measures of seed harvesting and caching behavior were assessed ... | 2004 | 14534782 |
| nutrient dynamics in singleleaf pinyon (pinus monophylla torr & frem.) needles. | nutrient retranslocation from existing foliage of singleleaf pinyon pine (pinus monophylla torr. & frem.) did not meet the nutrient demands of new needles on the same branch. singleleaf pinyon pines, with an average age of 177 years, located at an elevation of 2300 m on a ridge in the sweetwater range in nevada, usa retained needles for 18 or more years and increased needle number per branch by 17-18% annually. with age, needles gained weight and accumulated ca, mg, fe, zn, p, and mn. the amount ... | 1992 | 14969875 |
| simulated influence of leaf geometry on sunlight interception and photosynthesis in conifer needles. | the light interception capabilities of individual conifer needles are governed by their cross-sectional geometry and their orientation to sunlight. leaf cross sections typical of conifer tree species were modeled to quantify the interception of direct sunlight over a range of incident light angles. the needle shapes exhibited by abies nordmanniana spach, picea asperata master, pinus cembra l., p. monophylla torr & frém., and p. sylvestris l. were selected because they are representative of the r ... | 1993 | 14969899 |
| effectiveness of bifenthrin (onyx) and carbaryl (sevin sl) for protecting individual, high-value conifers from bark beetle attack (coleoptera: curculionidae: scolytinae) in the western united states. | high-value trees, such as those located in residential, recreational, or administrative sites, are particularly susceptible to bark beetle (coleoptera: curculionidae: scolytinae) attack as a result of increased amounts of stress associated with drought, soil compaction, mechanical injury, or vandalism. tree losses in these unique environments generally have a substantial impact. the value of these individual trees, cost of removal, and loss of esthetics may justify protection until the main thru ... | 2006 | 17066800 |
| geographical and climatic limits of needle types of one- and two-needled pinyon pines. | aim: the geographical extent and climatic tolerances of one- and two-needled pinyon pines (pinus subsect. cembroides) are the focus of questions in taxonomy, palaeoclimatology and modelling of future distributions. the identification of these pines, traditionally classified by one- versus two-needled fascicles, is complicated by populations with both one- and two-needled fascicles on the same tree, and the description of two more recently described one-needled varieties: the fallax-type and cali ... | 2008 | 21188300 |
| fungal planet description sheets: 69-91. | novel species of microfungi described in the present study include the following from australia: bagadiella victoriae and bagadiella koalae on eucalyptus spp., catenulostroma eucalyptorum on eucalyptus laevopinea, cercospora eremochloae on eremochloa bimaculata, devriesia queenslandica on scaevola taccada, diaporthe musigena on musa sp., diaporthe acaciigena on acacia retinodes, leptoxyphium kurandae on eucalyptus sp., neofusicoccum grevilleae on grevillea aurea, phytophthora fluvialis from wate ... | 2011 | 22025808 |
| edaphic limitations to growth and photosynthesis in sierran and great basin vegetation. | soils derived from hydrothermally altered andesite support unique communities of sierran conifers (pinus ponderosa laws. and p. jeffreyi grev. and balf.) amongst sagebrush (artemisia tridentata nutt.) vegetation in the western great basin. plants grown in soil derived from hydrothermally altered bedrock had lower growth rates, total biomass, and net photosynthetic rates than plants grown in soil derived from unaltered andesite of the same formation. total dry mass was 10 to 28% lower for conifer ... | 1989 | 28312357 |