Soil properties influencing compactability of forest soils in British Columbia. Can. J. Soil Sci. 84: 219-226. The widespread use of heavy machinery during harvesting and site preparation in timber plantations in British Columbia (BC) has led to concerns that compaction causes a reduction in long-term soil productivity. Impacts of properties such as total C, water content, and texture on compactability of forest soils in BC were assessed. Two compactability indices were used: maximum bulk density (MBD) and susceptibility to compaction (SC) determined by the standard Proctor test. Soil samples were collected from 16 sites throughout BC covering a wide range of biogeoclimatic zones. Soils varied in texture (12 to 87% sand, 9 to 76% silt, and 2 to 53% clay) and organic matter content (18 to 76 g kg -1 total C). A strong negative correlation was observed between MBD and gravimetric water content at which MBD was achieved (W MBD ) and between MBD and total C. Similarly, W MBD and total C had strong effects on SC. The estimation of either MBD or SC values was not substantially improved by including texture parameters to the regression equations in addition to the total C. The implication of the relationships observed in this study is that increases in soil organic matter reduce the risk of compactability, which is particularly important for forest soils where compaction is generally not corrected by implements after tree planting. The information is also useful for assessing the extent of compaction on soils affected by machine traffic.Key words: Soil compaction, Susceptibility to compaction, maximum bulk density, Proctor test, total carbon Krzic, M., Bulmer, C. E., Teste, F., Dampier, L. et Rahman, S. 2004. Propriétés exerçant une influence sur la compactibilité des sols forestiers de la Colombie-Britannique. Can. J. Soil Sci. 84: 219-226. L'usage largement répandu de machinerie lourde lors de l'aménagement des sites forestiers et de la récolte du bois en Colombie-Britannique laisse craindre un compactage qui pourrait réduire la productivité des sols à long terme. Les auteurs ont évalué l'incidence de certains paramètres comme la concentration totale de C, la teneur en eau et la texture sur la compactibilité des sols forestiers dans la province. Pour cela, ils ont utilisé deux indices : la masse volumique apparente maximale (MVAM) et la sensibilité au compactage (SC) telle qu'établie par le test normalisé de Proctor. Des échantillons de sol ont été prélevés à 16 endroits un peu partout dans la province de manière à couvrir une large éventail de zones biogéoclimatiques. La texture (12 à 87 % de sable, 9 à 76 % de limon et 2 à 53 % d'argile) et la teneur en matière organique (18 à 76 g de carbone par kg) des sols varient. On a relevé une forte corrélation négative entre la MVAM et la teneur en eau gravifique à laquelle on l'atteint (W MVAM ) ainsi qu'entre la MVAM et le C total. De même, la W MVAM et le C total exercent une forte influence sur la SC. L'inclusion des paramètres de la texture aux équations de régression,...

As global issues continue to place increasing demands on soil resources, the need to provide soil science education to the next generation of soil scientists and the general public is becoming more imminent. In many countries around the world, including Canada, soil is either not included in the high school curriculum or it is not covered in depth. To address this need for better integration of soil science into high school programs in Canada, a national collaborative program entitled Soil 4 Youth (soilweb.landfood.ubc.ca/youth/), was established in 2009. The goals of the Soil 4 Youth program are to: (1) promote the discipline of soil science to high school students and teachers, (2) create open access soil education resources that can be directly implemented in high school curricula in Canada, and (3) raise awareness about the importance of soil. During the initial 4 years of the Soil 4 Youth program, we developed a variety of soil education resources, struck collaboration with several provincial high school teachers’ associations and not‐for‐profit organizations focused on promotion of science, and focused our efforts toward reaching a broader group of high school teachers and students. Our initial efforts of building the Soil 4 Youth program indicate that it is a viable platform through which collaboration among Canadian soil scientists and high school teachers can take place to ensure that high school students are better informed about the importance of soil. Impact Statement The Canadian collaborative program, Soil 4 Youth, was established to promote the discipline of soil science to high school students and teachers. The program provides a platform for collaboration among soil scientists and high school teachers to ensure that high school students are better informed about the importance of soil. This article describes the development of the Soil 4 Youth program, offering insights into the challenges and potential solutions to advance soil science education for youth.

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