Foliar nutrient variation and sampling intensity for Acerrubrum trees

1988 ◽  
Vol 18 (1) ◽  
pp. 134-139 ◽  
Author(s):  
Gayne G. Erdmann ◽  
Thomas R. Crow ◽  
H. Michael Rauscher
Keyword(s):  
Red Maple ◽  
Mature Leaves ◽  
The North ◽  
Good Site ◽  
Foliar Nutrient ◽  
Foliar Concentrations ◽  
Poor Site ◽  
Individual Trees ◽  
North And South ◽  
Northern Michigan

Concentrations of N, P, K, Ca, and Mg were determined for red maple (Acerrubrum L.) foliage sampled during mid to late August. Samples of mature leaves were collected from the upper, middle, and lower crown on the north and south sides of 22 dominant and codominant red maple trees growing in 51- to 58-year-old even-aged stands on a good site (SI50 = 21.6 m) and a poor site (SI50 = 13.6 m) in northern Michigan. Although individual trees differed greatly in concentrations of all elements, trees growing on the good site had significantly higher foliar concentrations of P, Ca, and Mg than trees on the poor site. Concentrations of N and K were similar for both sites. Concentrations of N, P, K, and Ca also differed significantly with crown position, but no difference in concentration for any element was found with crown direction. The sample-size requirements are given for each element at a selected level of accuracy.

Effect of thinning on the foliar nutrient status of Scots pine stands on drained boreal peatlands

1996 ◽  
Vol 26 (9) ◽  
pp. 1577-1584 ◽  
Author(s):  
Hannu Hökkä ◽  
Timo Penttilä ◽  
Björn Hånell
Keyword(s):  
Scots Pine ◽  
Basal Area ◽  
Nutrient Status ◽  
Dry Mass ◽  
Southern Sweden ◽  
Needle Size ◽  
Boreal Peatlands ◽  
Foliar Nutrient ◽  
Foliar Concentrations ◽  
Individual Trees

Foliar responses to thinning in midrotation stands of Scots pine (Pinussylvestris L.) were studied in six thinning experiments (0–50% of basal area removed) established on drained peatlands in northern Finland and southern Sweden. The trophic level of the sites varied from ombrotrophic to meso-eutrophic. Needle sampling and analyses were carried out on individual trees of dominant and suppressed canopy layers. The variation in the needle dry mass and in the element concentrations and contents, calculated as plot means, was explained by thinning treatment, blocking by site groups and randoming blocking within the site. Thinning increased foliar concentrations of P, needle size, and contents of N, P, and K in all the canopy layers. It was concluded that thinning improved the foliar nutrient status by reducing the competition for nutrients.

THE OCCURRENCE AND ETIOLOGY OF AN ANNUAL CANKER OF SUGAR MAPLE IN PENNSYLVANIA

1966 ◽  
Vol 44 (10) ◽  
pp. 1401-1411 ◽  
Author(s):  
John M. Skelly ◽  
Francis A. Wood
Keyword(s):  
Sugar Maple ◽  
Predisposing Factor ◽  
The North ◽  
Sequence Of Events ◽  
Natural Range ◽  
Facultative Parasite ◽  
Dormant Season ◽  
Insect Activity ◽  
Individual Trees ◽  
North And South

An annual canker of sugar maple was found throughout the natural range of the species in Pennsylvania. The canker develops during the dormant season, has been increasing in incidence during the past three decades, occurs more frequently on the north and south sides of trees than on the east and west sides, and occurs more frequently on the lower portion of the stem. Severe cankering of individual trees had no apparent effect on diameter growth. It is suggested that the disease is caused by a sequence of events which involves a predisposing factor such as drought, frost, or insect activity followed by development of the facultative parasite Fusarium solani.

scholarly journals Response of a Scots pine (Pinus sylvestris) stand to application of phosphorus, potassium, magnesium and lime. 3. Foliar nutrient concentrations and stand development

1993 ◽  
Vol 41 (4) ◽  
pp. 291-307
Author(s):  
G. Arnold ◽  
A. Van Diest
Keyword(s):  
Scots Pine ◽  
Volume Growth ◽  
Stem Volume ◽  
Nutrient Concentrations ◽  
Growth Responses ◽  
Foliar Nutrient ◽  
Foliar Concentrations ◽  
Foliar Nutrient Concentrations ◽  
Annual Volume ◽  
Individual Trees

In 1985-88, a 25-yr-old Scots pine forest in Netherlands was limed and fertilized with P, K and Mg in a factoral design. This paper addresses effects of these treatments on foliar nutrient concentrations and tree growth. Stem volume increments of individual trees were measured. Average annual volume growth was estimated to be about 16 msuperscript 3/ha, which may be a slight underestimation. P and K showed increased foliar concentrations immediately after treatment and were the only elements that significantly increased volume growth in 1988-91. Additional annual volume growth of individual trees brought about by P and K corresponded with 0.9 and 2.2 msuperscript 3/ha, respectively. Foliar Mg and Ca increased later and insignificantly reduced and increased volume growth, respectively. Lime and Mg applications tended to lower foliar N. When absolute foliar concentrations and element ratios were compared to Dutch and German standards, it appeared that application of some of these standards in present research would not always have given a fully correct prediction of growth responses to nutrient additions.

Preliminary results of the study on the reasons of the Hai Hau erosion phenomenon

2007 ◽  
Vol 29 (3) ◽  
pp. 415-426
Author(s):  
Pham Van Ninh ◽  
Phan Ngoc Vinh ◽  
Nguyen Manh Hung ◽  
Dinh Van Manh
Keyword(s):  
Mathematical Modeling ◽  
Historical Data ◽  
Middle Part ◽  
Red River ◽  
Erosion Process ◽  
Red River Delta ◽  
The North ◽  
Severe Erosion ◽  
North And South ◽  
Very High

Overall the evolution process of the Red River Delta based on the maps and historical data resulted in a fact that before the 20th century all the Nam Dinh coastline was attributed to accumulation. Then started the erosion process at Xuan Thuydistrict and from the period of 1935 - 1965 the most severe erosion was contributed in the stretch from Ha Lan to Hai Trieu, 1965 - 1990 in Hai Chinh - Hai Hoa, 1990 - 2005 in the middle part of Hai Chinh - Hai Thinh (Hai Hau district). The adjoining stretches were suffered from not severe erosion. At the same time, the Ba Lat mouth is advanced to the sea and to the North and South direction by the time with a very high rate.The first task of the mathematical modeling of coastal line evolution of Hai Hau is to evaluate this important historical marked periods e. g. to model the coastal line at the periods before 1900, 1935 - 1965; 1965 - 1990; 1990 - 2005. The tasks is very complicated and time and working labors consuming.In the paper, the primarily results of the above mentioned simulations (as waves, currents, sediments transports and bottom - coastal lines evolution) has been shown. Based on the obtained results, there is a strong correlation between the protrusion magnitude and the southward moving of the erosion areas.

Studies of Ptiliidae (Coleoptera) in the Spirit Collection of the Natural History Museum, London 2: New species and records from P. Hammond's visit to New Zealand in 1983–84

2018 ◽  
Vol 154 (3) ◽  
pp. 179-196
Author(s):  
Michael Darby
Keyword(s):  
New Species ◽  
New Zealand ◽  
Natural History ◽  
Natural History Museum ◽  
History Museum ◽  
The North ◽  
Three New Species ◽  
North And South

Some 2,000 Ptiliidae collected in the North and South Islands of New Zealand in 1983/1984 by Peter Hammond of the Natural History Museum, London, are determined to 34 species, four of which are new to the country. As there are very few previous records, most from the Auckland district of North Island, the Hammond collection provides much new distributional data. The three new species: Nellosana insperatus sp. n., Notoptenidium flavum sp. n., and Notoptenidium johnsoni sp. n., are described and figured; the genus Ptiliodes is moved from Acrotrichinae to Ptiliinae, and Ptenidium formicetorum Kraatz recorded as a new introduction. Information is provided to aid separation of the new species from those previously recorded.

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