scholarly journals Effects of Oxidized Brown Coal Humic Acid Fertilizer on the Relative Height Growth Rate of Three Tree Species

Forests ◽  
2018 ◽  
Vol 9 (6) ◽  
pp. 360 ◽  
Author(s):  
Ganchudur Tsetsegmaa ◽  
Khaulenbek Akhmadi ◽  
Wonwoo Cho ◽  
Sora Lee ◽  
Romika Chandra ◽  
...  
Keyword(s):  
Growth Rate ◽  
Humic Acid ◽  
Brown Coal ◽  
Tree Species ◽  
Height Growth ◽  
Relative Height

scholarly journals Effects of Oxidized Brown Coal Humic Acid Fertilizer on the Relative Height Growth Rate of Several Tree Species

2018 ◽  
Author(s):  
Ganchudur Tsetsegmaa ◽  
Khaulenbek Ahmedi ◽  
Wonwoo Cho ◽  
Sora Lee ◽  
Romika Chandra ◽  
...  
Keyword(s):  
Growth Rate ◽  
Humic Acid ◽  
Brown Coal ◽  
Management Practices ◽  
Field Experiments ◽  
Organic Fertilizer ◽  
Chemical Properties ◽  
Height Growth ◽  
Relative Height ◽  
Positive Effect

Field experiments were carried out during 2011-2014 at the Research and Experimental Center to Combating Desertification located in the Elsen Tasarkhai station of central Mongolia. The study was aimed to identify the effects of oxidized brown coal humic acid fertilizer on the relative growth rate of several trees for forest rehabilitation. The trees used were Populus sibirica, Salix ledebouriana and Acer tataricum. The experiment was carried out with the concentrations of 2,000, 10,000 and 20,000 mg L-1 of humic acid fertilization treatments. The measurement of relative height growth rate (RHGR) was conducted for a period of 4 years. The treatments showed significant differences within humic fertilizer concentrations which differed depending on the species. Compared to the monthly RHGR over the study, the treatment of fertilizers were significantly better for tree growth. P. sibirica in the 10,000 and 20,000 mg L-1 humic acid fertilizers had significant height growth rates. In addition, when the humic acid treatments were compared to control, A. tataricum decreased over the years which were statistically significant for high growth rate and a positive effect of humic acid fertilization treatments was observed. Furthermore, results showed that oxidized brown coal humic acid fertilizers as organic fertilizer can have a positive effect for the growth of A. tataricum during the study years. The results showed that the soil chemical properties EC, CO2, NO3, and K2O were significant among all the treatments compared to the control. The effect on P2O5 statistically significantly increased among all the treatments. However, pH and Mg were not significant effect among all the treatments. Combining the results obtained from the oxidized brown coal humic acid fertilization with sustainable land management practices can help improve soil organics for environmental issues in degraded sandy soil regions.

scholarly journals Effects of Age and Stand Density of Mother Trees on EarlyPinus thunbergiiSeedling Establishment in the Coastal Zone, China

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Peili Mao ◽  
Guangxuan Han ◽  
Guangmei Wang ◽  
Junbao Yu ◽  
Hongbo Shao
Keyword(s):  
Growth Rate ◽  
Seed Germination ◽  
Seedling Growth ◽  
Biomass Allocation ◽  
Stand Density ◽  
Height Growth ◽  
Relative Height ◽  
Mass Ratio ◽  
Mother Tree ◽  
Seedling Biomass

Effects of age and stand density of mother tree on seed germination, seedling biomass allocation, and seedling growth ofPinus thunbergiiwere studied. The results showed that age of mother tree did not have significant influences on seed germination, but it was significant on seedling biomass allocation and growth. Seedlings from the minimum and maximum age of mother tree had higher leaf mass ratio and lower root mass ratio than from the middle age of mother tree. Moreover, they also had higher relative height growth rate and slenderness, which were related to their biomass allocation. Stand density of mother tree mainly demonstrated significant effects on seed germination and seedling growth. Seed from higher stand density of mother tree did not decrease germination rate, but had higher mean germination time, indicating that it delayed germination process. Seedlings of higher stand density of mother tree showed higher relative height growth rate and slenderness. These traits of offspring from higher stand density of mother tree were similar to its mother, indicating significant environmental maternal effects. So, mother tree identity of maternal age and environments had important effects on natural regeneration of the coastalP. thunbergiiforest.

Height growth of planted black spruce seedlings in response to interspecific vegetation competition: a comparison of four competition measures at two measuring positions

2000 ◽  
Vol 30 (4) ◽  
pp. 573-579 ◽  
Author(s):  
G G Wang ◽  
J Su ◽  
J R Wang
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Picea Mariana ◽  
Black Spruce ◽  
Height Growth ◽  
Percent Cover ◽  
Relative Height ◽  
Full Sunlight ◽  
Significant Relationships ◽  
Hemispherical Photographs

Four simple measures of interspecific competition (percent cover visually estimated in the field, percent cover derived from hemispherical photographs, percent full sunlight measured by a ceptometer, and gap light index derived from hemispherical photographs) obtained at two reference positions (the top and the middle of crop seedlings) were evaluated in relation to two growth variables (relative height growth rates in 1998 and during 1996 to 1998) of black spruce (Picea mariana (Mill.) BSP) seedlings planted on boreal mixedwood sites in southeastern Manitoba. The four competition measures assessed at the two measuring positions explained 57.2-68.0% of the total variation in black spruce height growth rate. Significant relationships were found among the four measures, and between the two measuring positions for each measure. The measuring position was not critical for all competition measures except the percent full sunlight measured by the ceptometer, for which the middle position was much better. When assessed at their preferred positions, the four competition measures ranked as follows: (i) percent cover derived from hemispherical photographs or percent full sunlight measured by the ceptometer; (ii) gap light index derived from hemispherical photographs; and (iii) visually estimated percent cover of vegetation.

Post-fire regeneration strategies contribute to plant growth dynamics and habitat selection in subtropical monsoon fire-prone ecosystem

2020 ◽  
Author(s):  
Caifang Luo ◽  
Yiying Li ◽  
Kang Yang ◽  
Jie Han ◽  
Youxu Jiang ◽  
...  
Keyword(s):  
Growth Rate ◽  
Habitat Selection ◽  
Tree Species ◽  
Growth Dynamics ◽  
Height Growth ◽  
Living Environment ◽  
Random Factor ◽  
Distribution Ranges ◽  
Regeneration Strategies ◽  
Selection Of

<p>In fire-prone ecosystems subjected to frequent fires, trees species with different post-fire regeneration strategies (PFRS) coexist at local scale. Different growth dynamics and habitat selection of species account for their coexistence. To explore how much variety is decided by the PFRS, we selected four co-occurring tree species including one Facultative seeders (FS) species and three obligate resprouters (OR) species, conducted a field investigation to measure growth dynamics at sites with different time since last fire (TSF) and recorded its living environment information in Central Yunnan Plateau. We also measured the burl size of OR species to subclassify PFRS into obligate resprouters-resprouts number (OR-N) and obligate resprouters-resprouts height (OR-H) by the growth priority to quantity or height. Generally, FS and OR species exhibited different seedlings clump density and height growth rate (HGR) and showed different temporal dynamics. OR-N species occupied post-fire gaps with rapid canopy growth and were more predominant than OR-H species and FS species at the early period of post-fire regeneration, while OR-H species had the highest HGR. However, such difference was not well explained by environmental factors (R<sup>2 </sup>< 20%) except seedlings growth rate, while explanation increased when subclassfication was considered as random factor in linear mixed models (LMMs). Moreover, species habitat selection was also associated tightly with regeneration strategies. The result of Redundancy Analysis (RDA) indicated that Pinus (FS) dominated on sunny slope was consistent with gap-dependence model and environment-variability model, and Cyclobalanopsi (OR-H) are favored in the fertile sites that can facilitate its height growth. Resprouters species Lithocarpus which prefer growing on sunny slope in unburned areas but showed preference on shade slope in post-fire regeneration. Therefore, the impacts of regeneration strategies caused some species shift their normal distribution ranges after fire. In conclusion, different growth dynamics and habitat selection of the four tree species during the post-fire regeneration enable their coexistence. Our study provides a novel perspective that by using subclassification of regeneration strategies, the prediction power of species performance and niche partitioning can significantly increased.</p>

Height growth rate of Scots pine in Central Europe increased by 29% between 1900 and 2000 due to changes in site productivity

2021 ◽  
Vol 490 ◽  
pp. 119102
Author(s):  
Jarosław Socha ◽  
Svein Solberg ◽  
Luiza Tymińska-Czabańska ◽  
Piotr Tompalski ◽  
Patrick Vallet
Keyword(s):  
Growth Rate ◽  
Central Europe ◽  
Scots Pine ◽  
Height Growth ◽  
Site Productivity

scholarly journals General regularities of height-diameter curves in Hungarian oak, sessile oak and Turkey oak high forests

2020 ◽  
Vol 21 (2) ◽  
pp. 71-82
Author(s):  
Roumen Petrin
Keyword(s):  
Tree Species ◽  
Oak Forests ◽  
Relative Height ◽  
Sessile Oak ◽  
Turkey Oak

The height-diameter curves of natural even-aged Hungarian oak, sessile oak and Turkey oak forests in the regions of Staro Oryahovo, Sherba, Tsonevo and Aytos Forestry Districts have been studied. In order to explore the shape of the curves and, in particular, their steepness, the steepness index SI of Douhovnikov (“the method of natural indicators”) was applied. The curves were divided into three groups according to it: flat curves, medium steep curves and steep curves. Both the traditional height-diameter curves and the corresponding relative curves of Tyurin were studied. Consideration of the traditional height-diameter curves gives a certain ground for investigating to-gether the height-diameter curves of Hungarian oak and sessile oak, disregarding the tree species. This inference was confirmed by comparing the relative height-diameter curves for Hungarian oak, sessile oak and Turkey oak with Tyurin’s uniform curve of relative heights. For these comparisons we used the Willcoxon test. A statistically significant great proximity in their shapes was found. As a uniform average curve of relative heights has been established for all tree species, this proximity indicates a possibility of creating a single fan of height-diameter curves for high Hungarian, sessile and Turkey oak.

scholarly journals RESPONSE OF SOME WHEAT GROWTH TRAITS FOR FOR FOLIAR SPRAYING WITH HUMIC AND GLUTAMIC ACID

2019 ◽  
Vol 50 (6) ◽  
Author(s):  
Baqir & Zeboon
Keyword(s):  
Growth Rate ◽  
Humic Acid ◽  
Glutamic Acid ◽  
Growth Traits ◽  
Flag Leaf ◽  
Block Design ◽  
Dry Weight ◽  
Engineering Sciences ◽  
Significant Difference ◽  
Two Factors

A field experiment was conducted at the Agricultural Experiment Unit, College of Agriculture Engineering Sciences, University of Baghdad, during two winter seasons 2016-2017 and 2017-2018 to study the response of some growth traits for wheat Cv. Al forat to foliar spraying using with humic glutamic acid and acid. A factorial experiment was with in Randomized Complete Block Design applied three replications, it involved two factor ,first factor was glutamic acid with three concentrations (0,250,500) mg L-1, second factor was humic acid with three concentrations (0,1,2) ml L-1, have been sprayed at tillering and flowering stages. The results showed that all the studed growth traits (plant height, ,number of tillers, flag leaf area dry weight for plant , crop growth rate ,relative growth rate and biological yield) were affected  by spraying with humic acid and glutamic acid for two season concentration , 2ml -1 from humic acid was superior on most of studies traits , as for glutamic acid ,plants treated with concentrations 250 and 500 mg L-1 were produced the highest mean for studies traits but without significant difference between them in some traits .The interaction between two factors was significant on most studies growth traits .

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