Stand characteristics and climate modulate height to diameter relationship in Pinus merkusii and P. michoacana in Zambia

2021 ◽  
Vol 307 ◽  
pp. 108510
Author(s):  
Phillimon Ng'andwe ◽  
Donald Chungu ◽  
Frank Tailoka
Keyword(s):  
Pinus Merkusii ◽  
Stand Characteristics

scholarly journals Disentangling the Ecological Determinants of Species and Functional Trait Diversity in Herb-Layer Plant Communities in European Temperate Forests

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 552
Author(s):  
Janez Kermavnar ◽  
Lado Kutnar ◽  
Aleksander Marinšek
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Plant Communities ◽  
Functional Trait ◽  
Forest Stand ◽  
Relative Importance ◽  
Herb Layer ◽  
Bud Bank ◽  
Tree Species Composition ◽  
Stand Characteristics

Forest herb-layer vegetation responds sensitively to environmental conditions. This paper compares drivers of both taxonomic, i.e., species richness, cover and evenness, and functional herb-layer diversity, i.e., the diversity of clonal, bud bank and leaf-height-seed plant traits. We investigated the dependence of herb-layer diversity on ecological determinants related to soil properties, climatic parameters, forest stand characteristics, and topographic and abiotic and biotic factors associated with forest floor structure. The study was conducted in different forest types in Slovenia, using vegetation and environmental data from 50 monitoring plots (400 m2 each) belonging to the ICP Forests Level I and II network. The main objective was to first identify significant ecological predictors and then quantify their relative importance. Species richness was strongly determined by forest stand characteristics, such as richness of the shrub layer, tree layer shade-casting ability as a proxy for light availability and tree species composition. It showed a clear positive relation to soil pH. Variation in herb-layer cover was also best explained by forest stand characteristics and, to a lesser extent, by structural factors such as moss cover. Species evenness was associated with tree species composition, shrub layer cover and soil pH. Various ecological determinants were decisive for the diversity of below-ground traits, i.e., clonal and bud bank traits. For these two trait groups we observed a substantial climatic signal that was completely absent for taxonomy-based measures of diversity. In contrast, above-ground leaf-height-seed (LHS) traits were driven exclusively by soil reaction and nitrogen availability. In synthesis, local stand characteristics and soil properties acted as the main controlling factors for both species and trait diversity in herb-layer communities across Slovenia, confirming many previous studies. Our findings suggest that the taxonomic and functional facets of herb-layer vegetation are mainly influenced by a similar set of ecological determinants. However, their relative importance varies among individual taxonomy- and functional trait-based diversity measures. Integrating multi-faceted approaches can provide complementary information on patterns of herb-layer diversity in European forest plant communities.

Modelling the influence of environment and stand characteristics on basic density and modulus of elasticity for young Pinus radiata and Cupressus lusitanica

2008 ◽  
Vol 255 (3-4) ◽  
pp. 1023-1033 ◽  
Author(s):  
Michael S. Watt ◽  
Peter W. Clinton ◽  
Graham Coker ◽  
Murray R. Davis ◽  
Robyn Simcock ◽  
...  
Keyword(s):  
Pinus Radiata ◽  
Modulus Of Elasticity ◽  
Basic Density ◽  
Cupressus Lusitanica ◽  
Stand Characteristics

Spatial variations in soil organic carbon, nitrogen and phosphorus concentrations related to stand characteristics in subtropical areas

2016 ◽  
Vol 413 (1-2) ◽  
pp. 289-301 ◽  
Author(s):  
Fang Jiang ◽  
Xiaohong Wu ◽  
Wenhua Xiang ◽  
Xi Fang ◽  
Yeling Zeng ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Spatial Variations ◽  
Nitrogen And Phosphorus ◽  
Stand Characteristics

Sifat Kimia dan Proksimat Kayu Tekan Pinus merkusii

2021 ◽  
Vol 5 (1) ◽  
pp. 231
Author(s):  
Adesna Fatrawana ◽  
Deni Setiawan ◽  
Erika Novriyanti ◽  
Deded Sarip Nawawi ◽  
Laswi Irmayanti ◽  
...  
Keyword(s):  
Pinus Merkusii

Kayu memiliki sifat dasar bervariasi berdasarkan jenis dan dalam satu jenis dipengaruhi oleh faktor genetic dan lingkungan. Pembentukan kayu reaksi selama pertumbuhan pohon diikuti oleh perbedaan sifat dasar kayu. Penelitian ini bertujuan untuk menguji perbedaan kadar komponen kimia kayu tekan dan oposit Pinus merkusii Jungh et de Vriese dan pengaruhnya terhadap sifat kayu sebagai bahanenergi. Sampel kayu tekan dan oppsit yang diambil dari potongan kayu berbentuk disk dibuat serbuk berukuran 40-60 mesh. Kadar komponen kimia kayu tekan dan oposit diuji denganmerujuk pada standar TAPPI-1990 dan analisis prosimat merujuk pada standar ASTM-1983. Hasil penelitian menunjukan kayu tekan memiliki kadar selulosa dan hemiselulosa lebih rendah dibandingkan dengan kayu oposit, sedangkan kadar lignin kayu tekan lebih tinggi dibandingkan kayu oposit. Kelarutan kayu dalam air dari kayu tekan tekan lebih rendah, sedangkan kelarutan dalam NaOH 1% lebih tinggi dibandingkan kayu oposit.  Kayu tekan memiliki kadar zat terbang lebih rendah dan karbon terikat lebih tinggi dibandingkan dengan kayu oposit sehingga nilai kalor kayu tekan lebih tinggi dibandingkan kayu opositnya.  Karakteristik kayu tekan tersebut dipengaruhi oleh tingginya kadar lignin dan lebih rendahnya kadar holoselulosa dibandingkan dengan kayu oposit. Kata kunci: kayu tekan, kayu oposit, Pinus merkusii, komponen kimia, analisis proksimat, nilai kalor.

scholarly journals The effect of forest stand characteristics on spider diversity and species composition in deciduous-coniferous mixed forests

2014 ◽  
Vol 42 (2) ◽  
pp. 135 ◽  
Author(s):  
Ferenc Samu ◽  
Gábor Lengyel ◽  
Éva Szita ◽  
András Bidló ◽  
Péter Ódor
Keyword(s):  
Species Composition ◽  
Forest Stand ◽  
Mixed Forests ◽  
Stand Characteristics
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