Scientist at Work – Diana Beresford-Kroeger – Scientist Advocates Role for Trees in Human and Environmental Health – Biography – NYTimes.com

• By JIM ROBBINS

• Dr. Wilson, at Harvard, said that more research into the role of trees in the ecosystem was imperative and that it was alarming how little was known. “We need more research of this kind to use the things we have, such as trees, to their fullest,” he said.

  Both Dr. Wilson and Ms. Beresford-Kroeger proposed using stock from old-growth forests for planting new forest in the hopes of taking advantage of good genetics. “There’s an enormous difference between old-growth forests and tree plantations,” Dr. Wilson said.

  Ms. Beresford-Kroeger is famous in Canadian horticulture circles for her sprawling gardens, which she maintains with her husband, Christian Kroeger, and are often open to the public. She has 60,000 daffodils, more than 100 rare hellebores from Turkey and Iran and extremely rare peonies from China that are dark brown with red leaves and smell like chocolate.

  And she grows more than 100 types of trees, including rare fir trees and Siberian cherry trees, and disease-resistant chestnuts, elms and butternut.

  Ms. Beresford-Kroeger recently completed the book “Arboretum Borealis” about the boreal forest in Canada, which cuts across the northern half of the country. Canadian officials have recently announced plans to preserve 55 million acres — roughly half. “Trees are a living miracle,” Ms. Beresford-Kroeger said. “Leaves can take in carbon dioxide and create oxygen. And all creatures must have oxygen.”

• “In a walk through old growth forest, there are thousands if not millions of chemicals and their synergistic effects with one another,” she said. “What trees do chemically in the environment is something we’re only beginning to understand.”

• Her ideas are a rare, if not entirely new approach to natural history,” said Edward O. Wilson, a Harvard biologist who wrote the foreword for her 2003 book, “Arboretum America” (University of Michigan Press). “The science of selecting trees for different uses around the world has not been well studied.”

• She favors what she terms a bioplan, reforesting cities and rural areas with trees according to the medicinal, environmental, nutritional, pesticidal and herbicidal properties she claims for them, which she calls ecofunctions.

• Ms. Beresford-Kroeger, 63, is a native of Ireland who has bachelor’s degrees in medical biochemistry and botany, and has worked as a Ph.D.-level researcher at the University of Ottawa school of medicine