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eucalyptus grandis plantations:effects of management on soil carbon,nutrient contents and yields

Journal of Forestry Research 2020年第2期31卷 601-611页

作者： Diego Martin Sandoval Lopez Marcelo Fabian Arturi Juan Francisco Goya Carolina Alejandra Perez Jorge Luis Frangi Laboratorio de Investigacion de Sistemas Ecologicos y Ambientales(LISEA) Universidad Nacional de La PlataDiagonal 113 N°4691900 La PlataBuenos AiresArgentina

The expansion of fast-growing tree plantations is a worldwide process,with consequences on soil fertility and soil carbon *** results were found on the effects of afforestation with eucalyptus on soil carbon and other nutrient *** discrepancies are usually caused by differences in climate,land use history,soil texture as well as by management related factors such as plantation age,number of rotations,method of establishment(plantation or coppice),harvest residue management and soil *** studied the effect of plantation age,number of rotations,and method of establishment on soils and plant nutrient concentrations in eucalyptus grandis plantations in NE Argentina on different textured *** also determined if yields changed with nutrient variations in soils,and compared soils under plantations to soils under grasslands they ***-one *** stands of different ages,number of rotations and method of establishment were evaluated as well as eight grassland *** of carbon,nitrogen,phosphorus,potassium,calcium and magnesium were determined for soils and *** carbon and nitrogen decreased over the number of rotations and were more pronounced in soils with 50-60%sand than soils with>75%*** stands showed higher soil carbon and nitrogen levels than plantations,suggesting a negative effect of site preparation before planting on soil nutrient conservation,especially in fine-textured *** nutrient concentrations did not follow the trends observed for soil nutrients nor did they reflect nutrient *** was no evidence of decreased yields over successive *** carbon and nitrogen contents decrease when grasslands are replaced by *** plantations,and therefore a yield limitation may occur in a medium to long-term frame,especially in stands re-established for short-rotation *** residue management and site preparation must be specifically designed for improving so

关键词： Soil texture Grasslands Foliar nutrient concentrations Successive harvest Coppice eucalyptus grandis

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Understory plant diversity and phenolic allelochemicals across a range of eucalyptus grandis plantation ages

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林业研究:英文版 2023年第5期34卷 1577-1590页

作者： Jinjin Li Yumei Huang Lianghua Chen Shun Gao Jian Zhang Danju Zhang Sichuan Provincial Key Laboratory of Ecological Forestry Engineering College of ForestrySichuan Agricultural UniversityWenjiang 611130ChengduChina College of Landscape Architecture Sichuan Agricultural UniversityWenjiang 611130ChengduChina

Allelopathy is an important mechanism in eucalyptus plantations that causes detrimental impacts on understory *** compounds are the main allelochemicals suppressing understory ***,the dynamic changes in phenolic allelochemicals and their relationship with understory diversity with increasing age of eucalyptus plantations remain largely *** this study,the understory plant diversity was assessed and phenolic compounds identified from leaf litter,roots,and rhizosphere soil samples in a eucalyptus grandis plantation at two-year intervals for ten years using ultra-performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS).The abundance and diversity of under story plant species were lowest in 4-year-old plantations and increased significantly with *** phenolic acids and 10 flavonoids were identified from leaf litter,roots,and rhizosphere *** of the potential phenolic allelochemicals,such as salicylic acid,gallic acid,4-hydroxybenzoic acid,and epicatechin,were more abundant in younger plantations,especially at4 years *** concentrations of phenolic compounds in the rhizosphere zone were significantly lower than in litter and root samples and did not change significantly with an increase in ***,phenolic compounds contributed more to the variation in the understory plants than soil *** acid,ellagic acid,quercetin,salicylic acid,and 4-hydroxybenzoic acid were the main phenolic compounds explaining the variation in plant diversity with plantation *** findings indicate that young *** plantations,especially at four years of age,merit a greater focus because of their lower understory plant diversity and higher allelopathic potential.

关键词： eucalyptus grandis Phenolic compounds Understory plant diversity Plantation age

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Fire alters the availability of soil nutrients and accelerates growth of eucalyptus grandis in Zambia

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Journal of Forestry Research 2020年第5期31卷 1637-1645页

作者： Donald Chungu Phillimon Ng’andwe Henry Mubanga Felix Chileshe School of Natural Resources Copperbelt UniversityP.O.Box 21692KitweZambia Directorate of Distance Education and Open Learning Copperbelt UniversityP.O.Box 21692KitweZambia

Fire has been used to prepare land during tree plantation establishment for many years but uncertainty about how ecosystems respond to prescribed burning makes it difficult to predict the effects of fire on soil *** aim of this study was to determine the effect of burning accumulated forest residues(slash)on soil chemical properties and how trees *** analyzed 40 burned and unburned sites and compared growth of eucalyptus grandis *** ex Maiden between *** pH increased by 39%after fire,suggesting reduced soil acidity and increased *** nitrogen increased by 100%;other nutrients(Ca^2+,Mg^2+and K^+)also *** in nutrients had a significant effect on the growth of ***;larger and taller trees were associated more with burned than unburned *** study provides evidence that burning accumulated slash during land preparation prior to plantation establishment alters soil nutrient status and enhances the growth of ***.

关键词： Nitrogen mineralization Forest residue burning Soil nutrients Zambia exotic plantations Plantation establishment eucalyptus grandis

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Variation of basic density,calorific value and volumetric shrinkage within tree height and tree age of Ugandan grown eucalyptus grandis wood

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Journal of Forestry Research 2021年第2期32卷 503-512页

作者： Owen Emmanuel Sseremba P.Mugabi A.Y.Banana B.C.Wessels M.Plessis Department of Forestry Biodiversity and TourismMakerere UniversityKampalaUganda Department of Forestry and Wood Science Stellenbosch UniversityStellenboschSouth Africa

Insufficient knowledge on Ugandan grown eucalyptus grandis *** ex Maiden wood properties,high demand,and processing challenges led to a study into its physical *** obtained the variation of basic density(BD),calorific value(CV)and volumetric shrinkage(VS)within tree height and tree-age of ***,and its appropriate use based on these *** with good boles were harvested from Kabarole District in western Uganda to produce specimens as prescribed by British Standards and ASTM standard wood testing *** data reviews and statistical analysis using ANOVA,Tukey’s test and multivariate analysis were done to obtain property estimates and their variation within trees and amongst tree *** mean BD of *** is 413.6,380.5,471.0,and 501.1 kg m^(−3)at 3,6,9,and 12 years,respectively,showing significant increase with tree age(p=0.003).The pattern of BD with tree height showed a reduction with tree height although with higher values in the middle portion of the *** CV increases(p=0.014)with tree age and reduces with tree height with values of 14,560.32,15,447.3,16,079.11,and 16,932.6 kJ kg^(−1)at 3,6,9,and 12 years,*** percentage VS was 11.02,9.84,12.31,and 14.45 for 3-,6-,9-,and 12-year-old trees,respectively,and it did not vary significantly(p=0.088)with tree *** on these property values,*** wood could be used for scaffolding,light constructions and fuel wood *** seasoning needs to be longer with well monitored drying schedules to reduce seasoning defects caused by the high *** studies on strength properties,seasoning schedules,panel products properties and tree-age chemical variations would improve the knowledge about its wood quality and would enhance its efficient utilization.

关键词： eucalyptus grandis Age Calorificvalue Basic density Volumetric shrinkage Wood

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Evaluation of soil nutrients under eucalyptus grandis plantation and adjacent sub-montane rain forest

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Journal of Forestry Research 2010年第4期21卷 457-460,523页

作者： Shiferaw Alem Tadesse Woldemariam Jindrich Pavlis Mendel University Faculty of Forestry and Wood technology Environment and Coffee Forest Forum

A study was conducted to evaluate the status of soil nutrients under E. grandis plantation in comparison with that in its adjacent submontane rain forest. Twenty sequare plots, with an area of 20 m×20 m for each, were established in both of *** plantation and its adjacent sub-montane rain forest, independently. Soil samples were collected from each square plot, at five points （at the four comers and at the center） of each plot. The collected soil samples were mixed to make a composite and representative sample for each plot, independently. The analyses were done in a soil laboratory following appropriate methods. The analysis result indicated that there were no significance differences between E. grandis plantation and its adjacent sub-montane rain forest in the level of major soil nutrients （total N, available P, exchangeable K, Ca and Mg）, pH and total carbon of soils （p 〈 0.05）. There were significance differences between two sites of forest soils in percentage of clay particles, and exchangeable Na content. E. grandis plantation was found improving soil nutrients and total carbon as compared with that of its adjacent submontane rain forest.

关键词： eucalyptus grandis plantation rain forest soil nutrients sub-montane

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The effect of methylbenzene/ethanol ratios on chemical composition of extractives from eucalyptus grandis

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Forestry Studies in China 2012年第3期14卷 235-239页

作者： ZHANG Bin WU Shu-bin GUO Da-liang State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640R R.China

Chemical components of methylbenzene/ethanol extractives of eucalyptus grandis were identified by GC/MS and different methylbenzene/ethanol solutions （9/1, 4/1, 2/1, 1/1, 1/2） were used to describe their distinctions. The distributions of micro particles in each extractive were studied simultaneously. The results show that there were significant differences between the various extrac- tives, although the extractives were essentially the same, i.e., alcohols, alkanes, esters and acids. With the increase of ethanol compo- sition in the solutions, the total amount of extractives increased; in solvent with higher amounts of ethanol, some acidic structures or acids, such as glutaric acid, could be seen. An investigation of micro particles indicated that the distribution of particle size of each sample did not change greatly between the solutions. A slight decrease in size was seen with the reduction in the amount of methylbenzene.

关键词： extractives eucalyptus grandis micro particles

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Morphological Characteristics and Nutrient Content of Fine Roots of 2-Year-Old and 3-Year-Old eucalyptus grandis Plantation

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Agricultural Biotechnology 2012年第6期1卷 9-14页

作者： Xiaoyu DUAN Xianwei LI Liuling ZHOU Weishuang WANG Hui CHEN College of Forestry Sichuan Agricultural University (Ya'an Campus) College of Landscape Architecture Sichuan Agricultural University (Chengdu Campus)

[ Objective] This study aimed to explore the morphological characteristics and nutrient content of f＇me roots of 2-year-old and 3-year-old Euca/yptus grand/s plantation and investigate the correlation. [ Method] Fine roots of 2-year-old and 3-year-old eucalyptus grandis plantation were collected as experimental materials, to determine the root diameter （D）, root length （L）, specific root length （SRL） and contents of major nutrient elements N, P, K, Ca, Mg and C of fine roots （level 1 -5）, study the morphological characteristics and major nutrient element content and investigate the correlation. [ Result] The results showed that morphological differences of fine roots （ level 1 - 5 ） of eucalyptus grandis plantation were great with the increase of root order, to be specific, D and L increased and SRL decreased with the increasing root order; SRL, L and D of 3-year-old eucalyptus grauclis plantation were greater than those of 2-year-old Euca/yptus grand/s plantation. Contents of N, Ca, Mg and C of fine roots of 2-year-old and 3-year-old eucalyptus grandis plantation showed consistent orders with the increase of root order： N and Mg contents were reduced, while Ca and C contents were enhanced; P and K contents varied with different forest ages; both 2-year-old and 3-year- old eucalyptus grandis showed an order of C 〉 K 〉 Ca （Mg）〉 N. Major nutrient element content and morphological characteristics of eucalyptus grand/s fine roots （level 1 -5 ） were extremely significantly correlated （P 〈0.01 ）, SRL, L and D could be adopted as reference indices to evaluate nutrient status of eucalyptus grand/s. Required nutrients and fine root morphology of eucalyptus grandis plantation changed with the increase of forest age, and the nutrient cycling and energy flow patterns also changed; major nutrient dements in fine roots of 2-year-old and 3-year-old eucalyptus grandis plantation transferred in a different order from the growth order, therefore N fertilizer could be applied to impr

关键词： eucalyptus grandis Fine root Root order Nutrient elements Morphological characteristics

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Distribution and Accumulation of Nutrient Elements in Organic Tissue of eucalyptus grandis Saplings

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Agricultural Science & Technology 2015年第12期16卷 2749-2753,2880页

作者：闵安民王宇李红霞费楠李凤鸣四川省林业科学研究院四川成都610081 成都市新津县林业局四川新津611430

The biomass, macroelements （N, P, K, Ca, Mg） and microelements （Fe, Zn） contents were detected in organs of 1a-3a eucalyptus grandis saplings, as well as their accumulated amount. Results showed that contents of nutrient elements varied greatly in different organs. Total contents of macroelements N, P, K, Ca and Mg in1a-3a E. grandis were distributed in the order of stem phloem, leaves 〉 branch- es, roots 〉 stem xylem. Accumulated amount of macroelements in 1a-3a E. grandis were in the order of leaves 〉 branches 〉 stem phloem 〉 roots or stem xylem 〉 stem xylem or roots. Accumulated amount law of nutrient elements was not affected by the plant age. Microelements Fe and Zn were mainly concentrated in the leaves and roots. The accumulation of macroelements was in the order of Ca 〉 N 〉 K 〉 Mg 〉 P; and the microelements was in the order of Fe 〉 Zn. Accumulated amounts of microelements in 1a-3a E. grandis were 12.45 136.19 and 420.23 g per plants, respectively. Among the annual net accumulated amount of nutrient ele- ments per plant in 1a-3a E. grandis, Ca element was the maximum, N and K ele- ments took the second and third places. Mg element was relatively small and P el- ement was the minimum.

关键词： eucalyptus grandis Organ Nutrient element Accumulated amount

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Corrective Interventions to End-Splitting and Surface Cracking in Kenya Grown eucalyptus grandis Poles

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Open Journal of Forestry 2022年第3期12卷 380-392页

作者： George Muthike Godfrey Ali Nellie Oduor Paul Munene Joseph Githiomi Kenya Forestry Research Institute Nairobi Kenya Kenya Wood Preservers Association Homa Bay Kenya Kenya Bureau of Standards Nairobi Kenya

This study determined the effect of three pole pre-drying handling techniques, on end-splitting and surface checking in eucalyptus grandis poles from highland and low land areas in Kenya. A total of 144 eucalyptus grandis trees were sampled from two sites;Kericho, representing the wet highlands and Londiani representing the drier lowlands regions of Kenya. Pole samples from both sites were subjected to the three pre-drying handling techniques for the first 30 days after felling and allowed to dry to the required moisture level under observations. The number of end splits and surface checks on each sample pole were counted and the length of the worst ones was measured in millimeters after every 15 days until all the poles reached 25% MC. The sap wood and heart wood ratios were determined from selected samples. Results showed that on the overall, poles from high land areas had the highest sapwood proportions and similarly had the highest number and the longest end splitting and surface checks. On the other hand, pre-drying techniques that allowed felled trees to dry slowly with their foliage intact for the first 30 days of felling produced the best quality poles, with fewer and shallower end splits and surface checks. The study recommended that felling and leaving poles to dry slowly with foliage intact be considered in reducing losses incurred as a result of wood stresses during drying of poles.

关键词： eucalyptus grandis Wood Cracking Wood Stresses Wood Drying

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A Study of the Distribution and Accumulation of Major Nutrient Elements in Different Densities of eucalyptus grandis

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Agricultural Science & Technology 2017年第6期18卷 1062-1066页

作者：王丽龙汉利郭洪英辜云杰肖兴翠盛玉珍四川省林业科学研究院四川成都610081

This study was conducted to investigate the distribution and accumulation of major elements of 5-year-old eucalyptus grandis forests with the densities of 556 trees/hm2 and 1 667 trees/hm2. The results showed that：（1） The distribution of ma- jor nutrient element contents in various organs of the E. grandis with the 2 densi- ties was nearly the same, and the ranked order was leaf〉tree trunk〉branch or branchlet〉fruit〉bark. （2） From the distribution of nutrient elements and organic mat- ter in the trunk, P, K, Mg and Ca contents presented basically a trend of increasing with the trunk height increasing. And the organic matter content increased with the trunk height increasing in the low density stand, while the result was opposite in the high density stand. Furthermore, N content increased with the trunk height increas- ing in the low density stand, but the content in the high density stand exhibited a trend of decreasing at first, increasing then and increasing at the last. （3） From the distribution of biomass, the ranked order was tree trunk〉bark or branch〉branchlet〉 leaf〉fruit. And （4） The accumulated amounts of major nutrient elements in various organs under the 2 stand densities was nearly same. Ca content was the highest in the 2 kinds of plantations, followed by N, K, Mg and P contents. Ca content was 601.78 kg/hm2 in the low density stand and 1 204. 43 kg/hm2 in the high density stand.

关键词： eucalyptus grandis Stand density Nutrient elements Distribution

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