Variability of Understory Sweetgum Biomass Relationships

Abstract Understory sweetgum (Liquidambar styraciflua L.) in three 40-50-yr-old stands of loblolly pine was sampled to estimate the total and component biomass encompassed by this species. Individual tree sweetgum equations (based on D²H) were developed for total tree and tree component biomass for each stand. Total stand estimates of 9.79, 8.38, 1.09, and 0 32 tons/ac were determined for total, stem, branch, and foliage dry weight, respectively. There were no statistical differences among stands for total tree and stem biomass equations, but differences were found among stands for foliage and branch equations. The differences among crown component equations are probably reflective of the understory growing conditions in the different stands. South. J. Appl. For. 12(1):5-7.

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Liana infestation impacts tree growth in a lowland tropical moist forest

Biogeosciences Discussions ◽

10.5194/bgd-6-3133-2009 ◽

2009 ◽

Vol 6 (2) ◽

pp. 3133-3158 ◽

Cited By ~ 7

Author(s):

G. M. F. van der Heijden ◽

O. L. Phillips

Keyword(s):

Tropical Forests ◽

Tree Growth ◽

Atmospheric Carbon Dioxide ◽

Dry Weight ◽

Growth Conditions ◽

Linear Mixed Effect Model ◽

Mixed Effect ◽

Individual Tree ◽

Rate Of Increase ◽

Growing Conditions

Abstract. Stand-level estimates of the effect of lianas on tree growth in mature tropical forests are needed to evaluate the functional impact of lianas and their potential to affect the ability of tropical forests to sequester carbon, but these are currently lacking. Using data collected on tree growth rates, local growing conditions and liana competition in five permanent sampling plots in Amazonian Peru, we present the first such estimates of the effect of lianas on above-ground productivity of trees. By constructing a multi-level linear mixed effect model to predict individual tree diameter growth model using individual tree growth conditions, we were able to estimate stand-level above-ground biomass (AGB) increment in the absence of lianas. We show that lianas, mainly by competing above-ground with trees, reduce tree annual above-ground stand-level biomass by ~10%, equivalent to 0.51 Mg dry weight ha−1 yr−1 or 0.25 Mg C ha−1 yr−1. AGB increment of lianas themselves was estimated to be 0.15 Mg dry weight ha−1 yr−1 or 0.07 Mg C ha−1 yr−1, thus only compensating ~29% of the liana-induced reduction in stand-level AGB increment. Increasing liana pressure on tropical forests may therefore not only reduce their carbon storage capacity, by indirectly promoting tree species with low-density wood, but also their rate of carbon uptake, with potential consequences for the rate of increase in atmospheric carbon dioxide.

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Green and Dry-Weight Equations for Above-ground Components of Planted Loblolly Pine Trees in the West Gulf Region

Southern Journal of Applied Forestry ◽

10.1093/sjaf/11.4.212 ◽

1987 ◽

Vol 11 (4) ◽

pp. 212-218 ◽

Cited By ~ 20

Author(s):

V. C. Baldwin

Keyword(s):

Pinus Taeda ◽

Loblolly Pine ◽

Weight Ratio ◽

Dry Weight ◽

Prediction Equations ◽

Gulf Region ◽

The West ◽

Biomass Equations ◽

Pine Trees ◽

Pinus Taeda L

Abstract Prediction equations based on 130 sample trees from thinned and unthinned loblolly pine (Pinus taeda L.) plantations in central Louisiana are presented for the green and dry weights of aboveground tree components. Sample trees ranged from 2 to 21 in. dbh, 18 to 94 ft in height and from 9 to 55 yr in age. Significant differences in partial stem weight between trees from thinned and unthinned stands required development of separate sets of weight ratio equations. The range of the studies' observations increases the predictive applicability of planted loblolly pine biomass equations. South. J. Appl. For. 11(4):212-218.

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Photosynthate allocation in Pinustaeda. II. Seasonal aspects of photosynthate allocation to different biochemical fractions in shoots

Canadian Journal of Forest Research ◽

10.1139/x80-057 ◽

1980 ◽

Vol 10 (3) ◽

pp. 338-347 ◽

Cited By ~ 13

Author(s):

Hsu-Ho Chung ◽

Robert L. Barnes

Keyword(s):

Loblolly Pine ◽

Starch Content ◽

Soluble Sugars ◽

Dry Weight ◽

Growing Season ◽

Total Biomass ◽

Dynamic Allocation ◽

Structural Growth ◽

Photosynthate Allocation ◽

Growing Conditions

Research was conducted to study (1) seasonal changes in tissue composition and (2) dynamic allocation of photosynthate to different biochemical fractions in growing shoots of the current and previous years of 15-year-old loblolly pine (Pinustaeda L.). As the growing season progressed, the shoots increased rapidly in total biomass; however, old needles formed in the previous year lost dry weight. The most striking biochemical change was a rapid decrease in starch content of old needles early in the growing season. Soluble sugars and organic acids in old needles also decreased slightly. Contents of biochemical constituents generally increased in current axes and needles as the organs grew and increased in weight, although there were decreases in organic acid contents of current axes early in the growing season. Formation of nonlabile major constituents (cellulose, hemicelluloses, lignin, and protein) in current-year shoots proceeded at different rates. These rates were interpreted in terms of aspects of shoot growth and development. Seasonal allocation of photosynthates into biochemical constituent fractions in current year growth flushes was calculated. Results suggested that photosynthates were allocated to constituents of different functional categories (metabolism, storage, structure, and protection) at different times of the growing season in such a way that structural growth was of first priority. Thus, allocation of photosynthates to structural growth early in the season enables branches to compete for favorable growing conditions.

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Estimating individual tree leaf area in loblolly pine plantations using LiDAR-derived measurements of height and crown dimensions

Forest Ecology and Management ◽

10.1016/j.foreco.2005.03.025 ◽

2005 ◽

Vol 213 (1-3) ◽

pp. 54-70 ◽

Cited By ~ 81

Author(s):

Scott D. Roberts ◽

Thomas J. Dean ◽

David L. Evans ◽

John W. McCombs ◽

Richard L. Harrington ◽

...

Keyword(s):

Leaf Area ◽

Loblolly Pine ◽

Pine Plantations ◽

Individual Tree ◽

Tree Leaf ◽

Crown Dimensions

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Agronomic performances of Pak Choi grown with different soil cover

Horticultura Brasileira ◽

10.1590/s0102-053620150000200020 ◽

2015 ◽

Vol 33 (2) ◽

pp. 261-266 ◽

Cited By ~ 1

Author(s):

Márcia M Echer ◽

Graciela M Dalastra ◽

Tiago L Hachmann ◽

Elcio S Klosowski ◽

Vandeir F Guimarães

Keyword(s):

Soil Cover ◽

Block Design ◽

Dry Weight ◽

Bare Soil ◽

Production Traits ◽

Pak Choi ◽

Randomized Block Design ◽

Black Plastic ◽

Growing Conditions ◽

Set Up

An important aspect in the cultivation of vegetables is the quality of the product to be marketed, free from dirt and damage and the practice of mulching could be an option, but there is scarse information. The aim of this study was to evaluate the influence of mulching on the production traits of three cultivars of Pak Choi. The experiment was set up during March to May 2013 using a split plot randomized block design, with four replications. Soil cover treatments (white agrotextile, black agrotextile, black plastic, silver plastic, tifton straw and bare soil) were arranged in the plots, and three cultivars of Pak Choi (Green Pak Choi, White Pak Choi and Chingensai Natsu Shomi) in subplots. Height and diameter of shoots, number of leaves, fresh weight of the head and petiole, base diameter, dry weight of stem, petiole, and leaf were evaluated thirty-five days after transplantation. The total dry weight and leaf area were measured, and then we estimated the yield. There was a significant effect of soil cover and cultivar. In general, the cover with synthetic materials showed higher values on production of Pak Choi. The cultivar White Pak Choi was better adapted to the growing conditions, with an average yield of 57.78 t/ha.

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AMINO ACID COMPOSITION OF LEAVES OF THREE SPECIES OF ARTEMISIA L. GROWING IN THE ELTON REGION

chemistry of plant raw material ◽

10.14258/jcprm.2021038736 ◽

2021 ◽

pp. 219-225

Author(s):

Галина Табаленкова

Keyword(s):

Amino Acids ◽

Czech Republic ◽

Amino Acid ◽

Dry Weight ◽

Biologically Active ◽

Raw Material ◽

Buffer System ◽

Amino Acid Analyzer ◽

Growing Conditions ◽

High Level

The results of studies of the qualitative composition and quantitative content of amino acids (AAs) in the leaves of three plant species of the genus Artemisia, widespread in the Elton region, were presented. Protein AAs were determined on an AAA T-339 amino acid analyzer (Czech Republic) after hydrolysis of a sample in 6N HCl at 105 °C for 24 h, free AAs – on an AAA-400 amino acid analyzer (Czech Republic) in a lithium buffer system. The protein AAs amount varied from 66 mg / g in A. lerchiana to 113 mg / g dry weight in A. santonica. 17 AAs were found in composition of these species, aspartic and glutamic acids were dominant. The content of free AAs varied from 4.4 mg / g in A. santonica to 8.3 mg / g dry weight in A. pauciflora. 14 AAs have been identified, among them proline was the predominant free AA. The share of proline was 75-81% of the total free AAs. Among the minor components, 3-4 compounds with a content above 2% dominated. The free AAs contain 3 non-proteinogenic ones (ornithine, citruline, and γ-aminobutyric acid). A. lerchiana and A. pauciflora species were similar in protein and free amino acids, probably due to the same growing conditions. A high level of free proline, together with a complex of biologically active substances in Artemisia species, which grow abundantly in the Elton region, allow to consider the possibility of their use as a medicinal raw material.

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Nutrient Content of the Aboveground Tissue of 12-week-old Loblolly Pine Intraprovenance and Interprovenance Crosses

Canadian Journal of Forest Research ◽

10.1139/x75-086 ◽

1975 ◽

Vol 5 (4) ◽

pp. 592-598 ◽

Cited By ~ 3

Author(s):

R. A. Woessner ◽

C. B. Davey ◽

B. E. Crabtree ◽

J. D. Gregory

Keyword(s):

Loblolly Pine ◽

Dry Matter ◽

Dry Weight ◽

Nutrient Content ◽

Seed Source ◽

Good Linear ◽

Available Nutrients ◽

Seed Sources ◽

Linear Relationships ◽

Aboveground Tissue

Nutrient content (P, K, Ca, Mg) of the aboveground tissue of a series of full-sib loblolly crosses was found to vary by genotype. Variability among and within seed sources is indicated for the ability to absorb Ca and Mg. Absorption of P and K was not found to be dependent on seed source, but the full-sib crosses differ. Good linear relationships were found between plant dry weight and weight of element but not between plant dry weight and percentage of element. Certain highly efficient crosses can be expected to be good producers of dry matter on sites low in available nutrients.

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The Association of a Longidorus Species with Stunting and Root Damage of Loblolly Pine (Pinus taeda L.) Seedlings

Plant Disease ◽

10.1094/pdis.2002.86.7.803 ◽

2002 ◽

Vol 86 (7) ◽

pp. 803-807 ◽

Cited By ~ 3

Author(s):

Stephen W. Fraedrich ◽

Michelle M. Cram

Keyword(s):

Pinus Taeda ◽

Loblolly Pine ◽

Dry Weight ◽

Forest Tree ◽

Root Weight ◽

Extraction Techniques ◽

Seedling Root ◽

Pine Seedlings ◽

Proper Diagnosis ◽

Pinus Taeda L

A Longidorus species was consistently associated with patches of stunted and chlorotic loblolly pine seedlings at a forest-tree nursery in Georgia. Seedlings from affected areas had poorly developed root systems that lacked lateral and feeder roots. Longidorus population densities in composite soil samples from the margins of patches ranged from 9 to 67 nematodes per 100 cm3 of soil. In a growth chamber experiment, seedling root dry weight decreased with respect to the initial Longidorus dose as well as the final Longidorus populations in containers. The dry root weight of seedlings were 0.117, 0.090, 0.066, and 0.065 g in containers initially infested with 0, 50, 100, and 200 Longidorus, respectively. Lateral and fine roots were lacking on seedlings at the highest doses. Populations of Longidorus increased in all containers during the experiment. Damage to loblolly pine seedlings caused by Longidorus is a previously undescribed problem in southern pine nurseries. Proper diagnosis of the problem by nematode testing laboratories may require the use of extraction techniques specific for larger nematodes such as Longidorus.

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Comparison of Planted Loblolly and Slash Pine Performance in Southeast Texas

Southern Journal of Applied Forestry ◽

10.1093/sjaf/17.1.26 ◽

1993 ◽

Vol 17 (1) ◽

pp. 26-31 ◽

Cited By ~ 1

Author(s):

J. David Lenhart ◽

Gary D. Kronrad ◽

Michael S. Fountain

Keyword(s):

Loblolly Pine ◽

Tree Height ◽

Pinus Elliottii ◽

Slash Pine ◽

Volume Index ◽

Fusiform Rust ◽

Tree Diameter ◽

Stem Straightness ◽

Southeast Texas ◽

Total Tree

Abstract The performance of young (less than 10 yr) loblolly (Pinus taeda L.) and slash (Pinus elliottii Engelm.) pine trees was compared on planted sites in southeast Texas. Performance was compared for: total tree height; tree diameter; height to live tree crown; tree volume index,; incidenceof fusiform rust (Cronartium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme); crookedness of stems; and survival rates. For these young trees, slash pine tended to perform better in southeast Texas than loblolly pine in total tree height, tree diameter, stem size, height to first livebranch and stem straightness. However, loblolly pine was less susceptible to fusiform rust than slash pine, and its mortality rate was lower than slash pine. However, based on the performance of these young plantations, a recommendation on the preferred pine species to plant in southeast Texasmight be premature. South. J. Appl. For. 17(1):26-31.

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