1,581 research outputs found
Protocol for inventory of mapped plots in tropical forest
No full textInventorying field mapped plots can be difficult in tropical forest because visibility and access are limited due to high density of woody plants. Additionally, steep slopes and frequent presence of fog further complicate field measurements in mountain areas. The objective of this study was to propose a detailed field census protocol. The method described allowed inventory of mapped 1-ha plots in a montane cloud forest with little cost and time. The inventory also included the recording of some environmental conditions, namely, light, soil coverage temperature and humidity. A detailed explanation dealing with species identification in the forest is also included. The method can be extended to different tropical as well as temperate forest ecosystems. Finally, a summary and comparison with different inventories focusing on mapped trees are given, along with a number of recommendations. © Forest Research Institute Malaysia
Incorporating environmental and geographical information in forest data analysis: a new fitting approach for universal kriging
No full text Universal kriging gives the optimal linear model to incorporate auxiliary information in data analysis in the presence of spatial dependence of observations if the underlying variogram is known. However, in practice, the variogram is typically unknown and its estimation constitutes one of the major problems in universal kriging theory. In this paper, a new method is proposed to estimate the variogram and the mean function in universal kriging based on the relationship between the second moments of the variable Z(s) and the auxiliary variables. The performance of the proposed method is analysed in three case studies: the prediction of site index in an Italian stone pine ( Pinus pinea L.) forest, the estimation of growing stock in a Scots pine ( Pinus sylvestris L.) stand, and the assessment of the environmental factors involved in the distribution of a Meliosma species in a tropical montane cloud forest. The results show that the proposed method performs as well as the maximum likelihood and least squares methods in terms of unbiasedness and precision of the kriging predictor and prediction error variance estimation. The proposed method allows the spatial variability linked to environmental and geographical factors to be identified in the analysis of data from forest ecosystems. </jats:p
Fanshawe College Presents: Author Alicia Elliott
No full textAuthor Alicia Elliott discusses her new book “A Mind Spread Out On The Ground”
Buy her book here: https://www.amazon.ca/Mind-Spread-Out...https://first.fanshawec.ca/firstnationscentre_visualcontent_videos_additionalvideos/1009/thumbnail.jp
Alicia Appleman-Jurman Lecture
No full textThis is a lecture given by Alicia Appleman-Jurman in May 1992 at Snow College in Ephraim, Utah as part of its Tanner Lecture Series. Alicia Appleman-Jurman is the author of the book Alicia: My Story, which she wrote over a three-year period while living in Holland. Although Appleman-Jurman spent her childhood in the mountains of Poland, she and her family had moved to Buczacz by the time World War II began. Appleman-Jurman is the only survivor from her immediate family of seven people; her mother was shot in front of her. Despite escaping from custody several times and having several near misses when she hid during raids in the ghetto, Alicia witnessed numerous atrocities by Nazi authorities against Jews. Appleman-Jurman contracted tuberculosis, from which she did not fully recover until her stay at a Belgian orphanage after the War. It was from there that she boarded the ship Theodor Herzl, bound for the Jewish homeland of Eretz Israel. And although the voyage ended with the internment in a prison camp on the island of Cyprus by the British of everyone, Appleman-Jurman did finally arrive in Palestine eight months thereafter. A question and answer session with the audience follows
Matrix of results from BNC: (i) the lower and left half of the matrix indicates the distance (metres) at which a spatial association was found using the analysis.
No full text<p>A positive value indicates attraction, and a negative value indicates repulsion: (ii) the upper and right half of the matrix indicates the distance at which a spatial association was found using the analysis. If a positive value indicates attraction among species at similar life-stages, then a negative value indicates attraction among species at opposite life-stages. In every case, the distances correspond to the point at which the spatial association is more important. The numbers in italics are the number of spatial associations that each species exhibited, corresponding to the results plotted in that half of the matrix. The cells marked in bold indicate that that pair of species showed similar association to a habitat (Ledo et al 2013), if the relation between species is positive or showed attraction and repulsion to a habitat if the relation is negative. Ms refers to Morphospecies, from Ledo et al. 2012.</p
Alicia Appleman-Jurman Oral History Interview
No full textAlicia Appleman-Jurman is the author of Alicia: My Story, which recounts her encounters as a Jewish child both during the Holocaust and immediately after World War II. In 1947, Appleman-Jurman journeyed from Europe to the Jewish homeland of Eretz Israel aboard the Theodor Herzl, a voyage that ended with imprisonment on the island of Cyprus. After eight months, she was finally allowed to go to Palestine, where she lived from 1947 to 1952, during which she attended the Mikveh Israel Agricultural School, served two years in the Israeli Navy, and met and married American Gabriel Appleman. The newlyweds moved to New York in 1952. Concurrently with pursuing various occupations and attending many different institutions of higher learning to study various subjects, Appleman-Jurman also began bearing witness to groups, mostly comprised of schoolchildren. Gabriel, Alicia, and their three children lived in several places around the world for Gabriel\u27s work, which is how they came to be in Israel during the Arab-Israeli War in 1973. The Appleman familiy returned to to California in 1975 and remained there. Alicia tried very hard not to allow the lives of her three children to be negatively affected by her own childhood wartime experiences. In fulfillment of the promise she had made to so many schoolchildren to eventually write down her story into book form, she wrote non-stop over a period of three years during the early 1980s while living in Holland. The impact of her story on readers is extremely important to Alicia Appleman-Jurman
Author interview: Q and A with Sonia Livingstone and Alicia Blum-Ross, authors of Parenting for a Digital Future
No full textIn this author interview, we speak to Sonia Livingstone and Alicia Blum-Ross about their new book, Parenting for a Digital Future, which draws on interviews and a national survey with UK parents to explore how hopes and fears about digital technologies are shaping parenting today
Different spatial organisation strategies of woody plant species in a montane cloud forest
No full textThe coexistence of a high number of species in the forest is a central issue in tropical ecology. In this paper, we aim to characterise the spatial pattern of woody species in an Andean montane cloud forest to determine whether differences exist among the species in terms of spatial organization and if so, whether these differences are related to the life-form, primary dispersal mode, shade tolerance or the diameter distribution of the species. For this purpose, we analysed the spatial pattern of each species as well as the spatial relationships between young and adult individuals. Almost all the analysed species showed a cluster pattern, followed by a random pattern at larger distances. The cluster size is more evident for the young trees whereas adult trees tended to be more randomly distributed. The shade-tolerant species showed greater distances of aggregation than gap or medium-shade-tolerant species. Species primarily dispersed by wind and small birds showed larger distances of aggregation than species dispersed by mammals or big birds. All the under-story woody plants showed a notable cluster pattern, whereas canopy trees showed a variety of spatial patterns, with clustering at small scales being the most frequent. In the case of emergent trees, association was found between young and adult individuals on a large scale. Positive associations between young and adult individuals predominate at small scales for medium and shade tolerant species and at larger scales for bird-dispersed species whereas negative spatial associations at smaller scales were found for shade tolerant species and wind dispersed species. Our study confirms that conspecific organization varies among the woody plants in the analysed forest, and that the spatial pattern of woody plants is partially linked to shade tolerance, primary dispersal mode and life form of the species. © 2011 Elsevier Masson SAS
Intertype mark correlation function: A new tool for the analysis of species interactions
No full textThe spatial pattern of the different species in complex ecosystems reflects the underlying ecological processes. In this paper a second order moment function is proposed and tested to analyse the spatial distribution of a mark, which could be a tree characteristic such as diameter or height, between two different types of points, which could be two different tree species. The proposed function was a conditional density function based on the intertype Krs(d) function, incorporating as test function the correlation of the marks between pairs composed of points of different types. The results obtained in simulated and real plots prove that the function is capable of revealing the scale at which spatial correlation of the mark between two types of points exists. The proposed function allows the spatial association between individuals of different species at different life stages to be identified. This analysis may reveal information on species ecology and interspecific interactions in forest ecosystems. © 2010 Elsevier B.V
Review of spatial indices used in forest inventory and their application in tropical forests
No full textThis paper reviews the different indices used to describe and characterize the horizontal structure or spatial pattern in forest stands, with particular emphasis on those which have been applied to the study of tropical forests. These indices have been classified according to their data-inventory requirements. A number of aspects concerned with the statistical properties of the most commonly employed indices (Fisher and Morisita indices, LQV techniques and SADIE in the quadrats group; Clark-Evans, Pielou and Byth-Ripley in the nearest-neighbour group; The empirical L(d) and O-ring functions in the mapped data group) and their applicability to tropical stands, have been tested in experimental plots located in an Andean tropical forest. © Facultad de Ciencias Biológicas UNMSM.Peer reviewe
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