scholarly journals Snow-Buried Young Forest Trees Growing on Steep Slopes

1969 ◽  
Vol 31 (1) ◽  
pp. 19-23 ◽  
Author(s):  
Masao SAEKI ◽  
Hiroo MATSUOKA



2020 ◽  
Author(s):  
Estela Nadal Romero ◽  
Pedro Sánchez Navarrete ◽  
Makki Khorchani ◽  
Luis Miguel Medrano-Moreno ◽  
Teodoro Lasanta

<p>Mediterranean mid-mountain areas have been subject to significant human pressure through deforestation, cultivation of steep slopes, fires and overgrazing. However, during the 20<sup>th</sup> century, the mountainous areas of the northern rim of the Mediterranean region were affected by abandonment of cultivated fields and natural revegetation processes. Natural revegetation occurred in most of the lands where human activity (farming on steep slopes, grazing) declined in intensity or was abandoned, resulting in the expansion of shrubs, bushes and forests. What are the consequences of such processes on soil quality, soil organic carbon (SOC) and soil total nitrogen (TN) stocks and vegetation composition? What are the differences between the different land uses and land covers (LULCs)? The general aim of this study is to study the effects of natural revegetation processes after land abandonment on soil quality, SOC and soil TN stocks and vegetation composition in the Leza Valley (Iberian System, Spain). We hypothesized that natural revegetation processes improves soil quality and higher SOC and TN stocks. For this purpose, we analyzed 60 soil samples, from 5 LULCs and four depths (0-10, 10-20, 20-30, 30-40 cm): pasture, shrubs characterized by the presence of Cistus laurifolius, bushed characterized by the presence of Juniperus communis, Young forest (Quercus faginea), and old forest or dehesa. In addition, plant species inventories were carried out in each LULC.</p><p>The results related to physico-chemical soil properties indicated: (i) significant differences in soil quality between the first stages of natural revegetation (pasture and shrubs) and young forest (limited to the first 20 cm between shrub and young forest); (ii)  significant differences in SOC stocks between the first stage of natural revegetation (pasture) and young and old forests; (iii) significant differences in soil TN stocks between pasture and shrubs and young and old forests; and (iv) significant differences between the shrub families. Final results obtained through a Principal Component Analysis with all the variables differentiate forests from shrubs, bushes and pastures confirming our first hypothesis. We can conclude that natural revegetation is an effective strategy to improve soil quality and increase SOC and soil TN stocks.</p>





2019 ◽  
Vol 437 (1-2) ◽  
pp. 375-395 ◽  
Author(s):  
Madeleine S. Günthardt-Goerg ◽  
Pierre Vollenweider ◽  
Sandra Hermle ◽  
Rainer Schulin


1963 ◽  
Vol 54 (2) ◽  
pp. 229-266 ◽  
Author(s):  
F. G. Browne

Brief notes are given on the distribution and habits of 42 species of Scolytidae and 34 of Platypodidae that occur as common forest insects in Ghana. A considerable number of these can be considered as beneficial insects because they do little damage but assist in the rapid break-down of dead trees and felling slash. Others are injurious mainly as timber borers, shoot borers or, generally to a lesser extent, as bark beetles and seed insects. Trachyostus ghanaensis Schedl and Doliopygus dubius (Samps.) are of outstanding importance in their constant or frequent habit of attacking the wood of living trees of commercial value; Platypus hintzi Schanf., Doliopygus conradti (Strohm.) and D. brevis (Strohm.) are probably the most important ambrosia beetle borers of newly felled timber; and Xyleborus semiopacus Eichh. has been known to destroy whole plantations of young forest trees.



2021 ◽  
Author(s):  
Simon Clausing ◽  
Rodica Pena ◽  
Bin Song ◽  
Karolin Müller ◽  
Paula Mayer‐Gruner ◽  
...  


1880 ◽  
Vol 9 (234supp) ◽  
pp. 3730-3730
Author(s):  
Charles S. Sargent
Keyword(s):  


Author(s):  
N. W. H. Allsop ◽  
J. V. Smallman ◽  
R. V. Stephens


2017 ◽  
Vol 23 (2) ◽  
Author(s):  
S. A. FIRDOUSI

During the survey of the forest fungal disease, of Jalgaon district, two severe leaf spot diseases on Lannae coromandelica and ( Ougenia dalbergioides (Papilionaceae) were observed in Jalgaon, forest during July to September 2016-17. The casual organism was identified as Stigmina lanneae and Phomopsis sp. respectively1-4,7. These are first report from Jalgaon and Maharashtra state.



2016 ◽  
Vol 12 (4) ◽  
Author(s):  
Ari Sandyavitri

This paper objectives are to; (i) identification of risky slopes (within 4 Provinces in Sumatra including Provinces of Riau, West Sumatra, Jambi and South Sumatra encompassing 840 kms of the “Jalan Lintas Sumatra” highway) based on Rockfall Hazard Rating Systems (RHRS) method; (ii) developing alternatives to stabilize slope hazards, and (iii) selecting appropriate slopes stabilization techniques based on both proactive approach and value engineering one. Based on the Rockfall Hazard Rating Systems (RHRS) method, it was identified 109 steep slopes prone to failure within this highway section. Approximately, 15 slopes were identified as potential high-risk slopes (RHRS scores were calculated >200 points). Based on the proactive approach, seven riskiest slopes ware identified. The preferred stabilization alternatives to remedy most of these slopes are suggested as follow; either (i) a combination of retaining wall and drainage, or (ii) gabion structure and drainage. However, different approaches may yield different results, there are at least 2 main consideration in prioritizing slope stabilization; (i) based on the riskiest slopes, and(ii) the least expensive stabilization alternatives.



Sign in / Sign up

Export Citation Format

Share Document