Survey of Sequoia Studies

摘要: The giant Sequoia (Sequoia gigantea) is an important climate -recording tree because of its immense life span, ability to live in scattered formation free from the influences close grouping, persistence surviving deficiency moisture and attacks pests and, finally, ringgrowth sites special character does show obvious relation precipitation. excellence rainfall records rings has only become verified recent years this depends so much upon immediate surroundings tree. Recognition Arizona vital importance local quality -ring record been a very great aid evaluating sequoias. early studies sequoia by writer began 1915, year following suggestion Dr. Clark Wissler that beams prehistoric ruins might prove interest. possibility precise dating had well recognized 1913 it seemed worthwhile try known crossdating methods attempt date logs sequoias California. Hence collections grew rapidly for several ring identification measurement were carried large numbers trees. A number comparisons made between California, then long -continued attempts crossdate means cyclic characters. This one region other was not successful matter dropped without publishing detailed accounts all specialized work on rings.' Now with assurance getting real climatic if we properly understand effects sites, collection, dating, measurement, measuring cyclics takes value study past climates. review therefore preliminary re-examination our longstored material purpose pointing out those parts most worth terms present knowledge. leads, course, exclusion many trees averages order improve resulting index grows Sierra Nevadas California at elevations 4000 7000 feet or more. We have radials about fifty different species. They full length radius except group twelve which secured stumps 1919 get last 500 each, three incomplete obtained Calaveras Grove north. largest collection came vicinity General Grant National Park another almost equal old Enterprise Mill site east Springville. COLLECTION TRIPS