Seasonal evolution of soil respiration in a mixed forestry plantation of walnuts (Juglans × intermedia Carr.) and alders (Alnus cordata (Loisel.) Duby) in Domaine de Restinclières (France)

The ecological intensification of crops is proposed as a solution to the growing demand of agricultural and forest resources, in opposition to intensive monocultures. The introduction of mixed cultures as mixtures between nitrogen fixing species and non nitrogen fixing species intended to increase crop yield as a result of an improvement of the available nitrogen and phosphorus in soil. Relationship between crops have received little attention despite the wide range of advantages that confers species diversity to these systems, such as increased productivity, resilience to disruption and ecological sustainability. Forests and forestry plantations can develop an important role in storing carbon in their tissues, especially in wood which become into durable product. A simplifying parameter to analyze the amount allocated carbon by plantation is the TBCA (total belowground carbon allocation), whereby, for short periods and mature plantations, is admitted as the subtraction between soil carbon efflux and litterfall. Soil respiration depends on a wide range of factors, such as soil temperature and soil water content, soil fertility, presence and type of vegetation, among others. The studied orchard is a mixed forestry plantation of hybrid walnuts(Juglans × intermedia Carr.) for wood and alders (Alnus cordata (Loisel.) Duby.), a nitrogen fixing specie through the actinomycete Frankia alni ((Woronin, 1866) Von Tubeuf 1895). The study area is sited at Restinclières, a green area near Montpellier (South of France). In the present work, soil respiration varied greatly throughout the year, mainly influenced by soil temperature. Soil water content did not significantly influence the response of soil respiration as it was constant during the measurement period and under no water stress conditions. Distance between nearest walnut and measurement was also a highly influential factor in soil respiration. Generally there was a decreasing trend in soil respiration when the distance to the nearest tree increased. It was also analyzed the response of soil respiration according to alder presence and fertilizer management (50 kg N·ha-1·año-1 from 1999 to 2010). None of these treatments significantly influenced soil respiration, although previous studies noticed an inhibition in rates of soil respiration under fertilized conditions and high rates of available nitrogen. However, treatments without fertilization and without alder presence obtained higher respiration rates in those cases with significant differences. The lack of significant differences between treatments may be due to the high coefficient of variation experienced by soil respiration measurements. Finally an asynchronous fluctuation was observed between soil respiration and litterfall during senescence period. This is possibly due to the slowdown in the emission of exudates by roots during senescence period, which are largely related to microbial activity.

Frank Lloyd Wright: edificios residenciales

Análisis y descripción de la arquitectura residencial del arquitecto.

Frank Lloyd Wright: espacios publicos

Análisis y descripción de los espacios públicos del arquitecto.

Frank Lloyd Wright, 90 años

Frank Lloyd Wright, 90 años

Frank Lloyd Wright

Frank Lloyd Wright

Zelma Lloyd Frank

Dr. Zelma Lloyd Frank was very active in the Jefferson City community and received both her Bachelor’s and Master’s degrees from Lincoln University. She received her Doctorate in Education at The University of Missouri-Columbia. Dr. Frank is a member of Phi Delta Kappa, Kappa Delta Pi, and the International and State Association for Children with Learning Disabilities. She was a teaching and reading assistant for elementary students in Missouri, Massachusetts, and New York. She was very active with the Capital City Council on the Arts, Meals on Wheels, St. Mary’s Health Center Auxiliary, and the local High School PTA.

2.2 Lincoln University History Club, 1934-35, Lloyd Gaines is in the back row, third from left

The usually reserved and shy scholar made a name for himself at Lincoln; joining the Alpha Phi Alpha social fraternity and becoming a member of the History Club and the Student Government, where he served as President for his senior class.

2.6 Lloyd Lionel Gaines, Lincoln University Junior Class Portrait, 1933-34

When the summer of 1935 rolled around, Gaines was contemplating his next step. He was graduating in August, with honors no less, and he was pondering a career. After graduation, he filed papers with placement office at Lincoln but he could not find an immediate position. Although he minored in education, Gaines was not primarily searching for a teaching position.

1.1 Lloyd Gaines: The Man, The Mission, & The Mystery

When great Civil Rights pioneers are discussed, the name Lloyd Gaines deserves to be mentioned. A man of humble beginnings, Gaines had dreams and goals for which he was willing to overcome outdated legal, social and educational systems do not only better himself but make a stand for his fellow man. The story of Lloyd Gaines is one of struggle, hope, success and injury. It is a life and legacy to be recognized, admired and celebrated.

1.2 Water Valley, Mississippi, Birthplace of Lloyd Gaines

Lloyd Gaines was born in Water Valley, Mississippi in 1911. Gaines’ family was sharecroppers outside the small Mississippi town, toiling in the cotton fields which caused Lloyd’s school attendance to be quite sporadic.

1.3 Lloyd and George Gaines in an undated photograph

Lloyd Gaines and his brother George Gaines in an undated photograph

1.6 Lloyd Gaines, Valedictorian, Vashon Class of 1931

Lloyd Gaines also helped to support his family by selling magazine subscriptions. He graduated in 1931 after only three years and served as the Valedictorian of his class. As a senior, Gaines finished first in a local essay contest, winning a prize of $250 (equivalent to $3000 in modern currency) that he used to enroll as a student at Stowe Teachers College in St. Louis for the 1931-32 school year