Improving the accuracy of tree biomass estimations for three coniferous tree species in Northeast China

Production of raw wood material and its regulation has a great ecological and economic importance in every country. The aim of the paper is to analyze the prospective production of raw wood with respect to the expected basic tree species composition and assortment structure on an example of long-term development of selected indicators of forest condition in Slovakia. For this analysis we used data on the area, growing stock and planned decennial timber felling in the forests of Slovakia in 1980, 1996 and 2003. The production potential of forests was evaluated on the basis of the annual perspective allowable cut by 2020, from which the prospective production of assortments was derived using the models of assortment yield tables of tree species. The results show that in the forests of Slovakia there is an about half proportion of coniferous and half proportion of broadleaved tree species, very good structure of growing stock as well as its trend in the last years. Production of raw wood assortments for industrial processing for the years 2010–2020 is limited by the volume 6.3–6.4 mil. m<sup>3</sup>. About one half of this volume comes from coniferous and the other half from broadleaved tree species. For coniferous tree species the proportion of spruce and fir is 87% and for broadleaved tree species the proportion of beech and oak is 80%. For coniferous tree species sawmill assortments have a decisive, almost 70% proportion. Regarding broadleaved tree species, pulpwood assortments with 47% proportion prevail, although with 11% the highest quality assortments for the production of veneer from beech and oak are also significant.

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Tree establishment and microhabitat relationships in north Swedish peatlands

Canadian Journal of Forest Research ◽

10.1139/x92-244 ◽

1992 ◽

Vol 22 (12) ◽

pp. 1869-1877 ◽

Cited By ~ 58

Author(s):

Mikael Ohlson ◽

Olle Zackrisson

Keyword(s):

Tree Species ◽

Coniferous Tree ◽

Northern Sweden ◽

Seedling Mortality ◽

Tree Establishment ◽

Specific Relationship ◽

Different Types ◽

Coniferous Tree Species ◽

Species Specific

We sowed seeds of Pinussylvestris L., Pinuscontorta Dougl, Piceaabies (L.) Karst., and Piceamariana (Mill.) B.S.P. at five different virgin peatland sites in northern Sweden. Seeds were sown in 1987, 1988, 1989, and 1990. The seeds were sown in three different types of microhabitat, viz Pleurozium, Sphagnumfuscum, and Sphagnumangustifolium. Germination and seedling mortality were monitored each year. Both germination and mortality were significantly affected by the micro-habitat. Sphagnumangustifolium microhabitats were most favourable and Pleurozium microhabitats were least favourable for germination of all tree species. In contrast, the mortality for all tree species was highest in Sphagnumangustifolium microhabitats and lowest in Pleurozium microhabitats. Lowest average mortality was found among the nonindigenous Pinuscontorta and Piceamariana. The coniferous tree species had a species-specific relationship with the microhabitat. Pinussylvestris seeds were the most able to germinate in the Pleurozium microhabitats, and seedling mortality was strongly affected by the microhabitat. Piceaabies was the least affected by the microhabitat, and seedling mortality was high irrespective of microhabitat.

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N, P, and K characteristics of different age groups of temperate coniferous tree species in northwestern China

Journal of Forestry Research ◽

10.1007/s11676-017-0442-3 ◽

2017 ◽

Vol 29 (2) ◽

pp. 471-478 ◽

Cited By ~ 2

Author(s):

Simin Liu ◽

Hao Wang

Keyword(s):

Tree Species ◽

Age Groups ◽

Northwestern China ◽

Coniferous Tree ◽

Coniferous Tree Species

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Modeling the effects of tree species and incubation temperature on soil's extracellular enzyme activity in 78-year-old tree plantations

Biogeosciences ◽

10.5194/bg-14-5393-2017 ◽

2017 ◽

Vol 14 (23) ◽

pp. 5393-5402 ◽

Cited By ~ 2

Author(s):

Xiaoqi Zhou ◽

Shen S. J. Wang ◽

Chengrong Chen

Keyword(s):

Tree Species ◽

Incubation Temperature ◽

N Cycling ◽

Residual Soil ◽

Coniferous Tree ◽

Soil C ◽

Hoop Pine ◽

Soil C And N ◽

C And N ◽

Coniferous Tree Species

Abstract. Forest plantations have been widely used as an effective measure for increasing soil carbon (C), and nitrogen (N) stocks and soil enzyme activities play a key role in soil C and N losses during decomposition of soil organic matter. However, few studies have been carried out to elucidate the mechanisms behind the differences in soil C and N cycling by different tree species in response to climate warming. Here, we measured the responses of soil's extracellular enzyme activity (EEA) to a gradient of temperatures using incubation methods in 78-year-old forest plantations with different tree species. Based on a soil enzyme kinetics model, we established a new statistical model to investigate the effects of temperature and tree species on soil EEA. In addition, we established a tree species–enzyme–C∕N model to investigate how temperature and tree species influence soil C∕N contents over time without considering plant C inputs. These extracellular enzymes included C acquisition enzymes (β-glucosidase, BG), N acquisition enzymes (N-acetylglucosaminidase, NAG; leucine aminopeptidase, LAP) and phosphorus acquisition enzymes (acid phosphatases). The results showed that incubation temperature and tree species significantly influenced all soil EEA and Eucalyptus had 1.01–2.86 times higher soil EEA than coniferous tree species. Modeling showed that Eucalyptus had larger soil C losses but had 0.99–2.38 times longer soil C residence time than the coniferous tree species over time. The differences in the residual soil C and N contents between Eucalyptus and coniferous tree species, as well as between slash pine (Pinus elliottii Engelm. var. elliottii) and hoop pine (Araucaria cunninghamii Ait.), increase with time. On the other hand, the modeling results help explain why exotic slash pine can grow faster, as it has 1.22–1.38 times longer residual soil N residence time for LAP, which mediate soil N cycling in the long term, than native coniferous tree species like hoop pine and kauri pine (Agathis robusta C. Moore). Our results will be helpful for understanding the mechanisms of soil C and N cycling by different tree species, which will have implications for forest management.

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