Loblolly pine needle decomposition and nutrient dynamics as affected by irrigation, fertilization, and substrate quality

2001 ◽  
Vol 152 (1-3) ◽  
pp. 85-96 ◽  
Author(s):  
Felipe G. Sanchez
Keyword(s):  
Loblolly Pine ◽  
Nutrient Dynamics ◽  
Pine Needle ◽  
Substrate Quality ◽  
Needle Decomposition

Inter-rotational Effects of Fertilization and Weed Control on Juvenile Loblolly Pine Productivity and Nutrient Dynamics

2014 ◽  
Vol 78 (S1) ◽  
pp. S152-S167 ◽  
Author(s):  
Praveen Subedi ◽  
Eric J. Jokela ◽  
Jason G. Vogel ◽  
Timothy A. Martin
Keyword(s):  
Weed Control ◽  
Loblolly Pine ◽  
Nutrient Dynamics

Bioassay Indicates a Metabolite of Hexazinone Affects Photosynthesis of Loblolly Pine (Pinus taeda)

Weed Science ◽  
1985 ◽  
Vol 33 (4) ◽  
pp. 440-442 ◽  
Author(s):  
Shi-Jean Susana Sung ◽  
David B. South ◽  
Dean H. Gjerstad
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Pine Needle ◽  
Bioassay Technique

The effects of hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4 (1H, 3H)-dione] and its metabolites, A [3-(4-hydroxycyclohexyl)-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4 (1H,3H)-dione], B [3-cyclohexyl-6-(methylamino)-1-methyl-1,3,5-triazine-2,4 (1H,3H)-dione], C [3-(4-hydroxycyclohexyl)-6-(methylamino)-1-methyl-1,3,5-triazine-2,4 (1H,3H)-dione], D [3-cyclohexyl-1-methyl-1,3,5-triazine-2,4,6 (1H, 3H,5H)-trione], and E [3-(4-hydroxycy clohexyl)-1-methyl-1,3,5-triazine-2,4,6 (1H,3H,5H)-trione], on photosynthesis of loblolly pine primary needle segments were studied using a bioassay technique. Hexazinone, at concentrations equal to or greater than 1.0 × 10-6M, inhibited photosynthesis, while 1.0 × 10-8M and 1.0 × 10-7M concentrations increased photosynthesis. Metabolite B at 1.0 × 10-4M also inhibited photosynthesis. Metabolites A, C, D, and E did not affect photosynthesis at 1.0 × 10-4in pine needle segments. The bioassay proved simple and useful for determining effects of certain herbicides and metabolites on photosynthesis.

Accumulation and release of plant nutrients in decomposing Scots pine needle litter. Long-term decomposition in a Scots pine forest II

1982 ◽  
Vol 60 (8) ◽  
pp. 1561-1568 ◽  
Author(s):  
Håkan Staaf ◽  
Björn Berg
Keyword(s):  
Weight Loss ◽  
Scots Pine ◽  
Nutrient Dynamics ◽  
Pine Forest ◽  
Plant Nutrient ◽  
Pine Needle ◽  
Needle Litter ◽  
Scots Pine Forest ◽  
Net Release

Plant nutrient dynamics in decomposing needle litter were measured during a 5-year period in a Scots pine forest in central Sweden. As seen over the whole 5-year period, the nutrients were retained (to a litter weight loss of about 75%) in the order Mn < Ca < K < Mg < S < N < P. During the first 1.5 years there was a net increase of N and P whereafter a net release took place. A similar but less pronounced development could be seen for S, whereas Ca, K, Mn, and Mg were released from the start of the incubation. It is suggested that P was the most limiting element for microbial activity during this first phase. There appeared to be only little initial leaching from the litter and the different behaviours of the elements could largely be explained by their concentration in litter in relation to the needs of microorganisms and to their solubility. K and Mg were the elements that were released at rates most similar to organic matter weight loss.

Foliar nutrient dynamics of 11-year-old loblolly pine (Pinustaeda) following nitrogen fertilization

1996 ◽  
Vol 26 (8) ◽  
pp. 1426-1439 ◽  
Author(s):  
Shangshan Zhang ◽  
H. Lee Allen
Keyword(s):  
Loblolly Pine ◽  
Nitrogen Fertilization ◽  
Nutrient Dynamics ◽  
Nutrient Deficiency ◽  
Growth Period ◽  
Nutrient Content ◽  
Crown Height ◽  
Foliar Nutrient ◽  
K Concentration ◽  
Internal Balance

Foliar macronutrient (N, P, K, Ca, Mg) concentration, content, retranslocation, internal balance, and variation with crown location and foliage age were quantified in 11-year-old loblolly pine (Pinustaeda L.) trees grown in two soil nitrogen regimes. Concentrations of N, P, and K decreased with foliage age, while the concentration of Ca increased. Nutrient content of new foliage increased with the elongation of foliage. Estimates of retranslocation were 75%, 73%, 83%, 28%, and less than 5% for N, P, K, Mg, and Ca, respectively. Increases in nutrient content of new foliage were associated with decreases in nutrient content of old foliage, suggesting transfer of nutrients to developing foliage. Concentrations and contents of P and K were greatest in the upper crown. Differences in N concentration among crown locations were small, although N content increased in the upper portion of the crown. Calcium and Mg concentrations decreased with crown height, but their contents generally did not differ among crown locations. Nitrogen fertilization increased N and Ca concentrations and fascicle weight, decreased P and Mg concentrations, and had no significant effect on K concentration. For the purposes of determining nutrient deficiency, our results suggest that foliar samples should be collected from 1-year-old foliage in the midcrown position during the rapid growth period for new shoots.

Long-term decomposition and nutrient dynamics in Pacific silver fir needles in western Washington

1984 ◽  
Vol 14 (3) ◽  
pp. 395-400 ◽  
Author(s):  
Robert L. Edmonds
Keyword(s):  
Weight Loss ◽  
Nutrient Dynamics ◽  
C:N Ratio ◽  
Silver Fir ◽  
Litter Bag ◽  
Needle Decomposition ◽  
Western Washington ◽  
The Mean ◽  
Coniferous Ecosystems

Long-term needle decomposition and nutrient dynamics (N, P, K, Ca, Mg, and Mn) were studied over a 6-year period in a Pacific silver fir (Abiesamabilis (Dougl.) Forb.) ecosystem in western Washington, U.S.A. Weight loss of needles was 41.2% after 14 months and 64.3% after 6 years. Decomposition constants (k values) declined with time of decomposition, but tended to stabilize afer4–6years. The mean residence time of needles was estimated to be 9 years. After 4 years decomposition weight loss paralleled lignin loss. Nitrogen was strongly immobilized in needles with 242% of original mass of N remaining after 4 years and 213% after 6 years. Net mineralization occurred when the C:N ratio fell below 20. Phosphorus appeared to be slightly immobilized in the 9- to 48-month period. Only 49% of the original P mass remained after 6 years. None of the other elements was immobilized during the 6-year period. The element mobility series was N < P < Mn < Ca < Mg < K. Two-year litter bag studies in subalpine coniferous ecosystems are not long enough to study litter decomposition rates and nutrient dynamics.

Nutrient dynamics in the litter fall and forest floor of an 18-year-old loblolly pine plantation

1986 ◽  
Vol 16 (5) ◽  
pp. 1109-1112 ◽  
Author(s):  
B. G. Lockaby ◽  
Jane Ellen Taylor-Boyd
Keyword(s):  
Steady State ◽  
Loblolly Pine ◽  
Forest Floor ◽  
Nutrient Dynamics ◽  
Sampling Period ◽  
Dry Weight ◽  
Litter Fall ◽  
Pine Plantation ◽  
Rapid Decomposition ◽  
North Louisiana

Dry weight and N, P, K, Ca, and Mg concentrations were monitored in the litter fall and forest floor of a loblolly pine (Pinustaeda) plantation in north Louisiana for 2 years. Dry weights of both litter fall and forest floor were statistically stable during the sampling period, possibly indicating steady-state conditions. A comparison of litter fall with forest floor weights indicated rapid decomposition (floor turnover = 1.5 years) relative to that of other loblolly pine systems.

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