The Selection of Prairie Areas in Iowa Which Should Be Perserved
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The Selection of Prairie Areas in Iowa Which Should Be Perserved ADA HAYDEN Reprinted from the PROCEEDINGS OF THE IOWA ACADEMY OF SCIENCE Vol. 52: 1945 By the IOWA CONSERVATION COMMISSION D.es Moines, Iowa THE SELECTION OF PRAIRIE AREAS IN IOWA WHICH SHOULD BE PRESERVED* ADA HAYDEN THE RECOMMENDED PRAIRIE PRESERVE In 1933, the Iowa Board of Conservation and the Iowa Fish and Game Commission now known as the Iowa State Conservation Com mission prepared a report known as •the Iowa Twenty-Five Year Conservation Plan. It was designated as a program for the judicious use of Iowa's natural resources. In the section of the Twenty-Five Year Plan listing and describing Scientific Preserves one type is recommended which had not been included previously. It is the Prairie Preserve. The following is the recommendation: "Prairie Preserve- Recommended. Along the railroad rights-of way, and here and there in small patches throughout the state. un broken virgin prairie sod is still to be found. Some of these will be saved because they lie within protected areas, or simply because the ground cannot be used for farm purposes. But somewhere in Iowa a large enough original tract of prairie vegetation should be secured in order to save, under control of the state, the character istic landscape, and wild flowers, and wild .life of the native prairies. Several tracts ranging from forty to three hundred acres have been found by the survey. The Conservation Plan includes a Prairie Pre serve which will be one of the remaining original areas, or which may be produced by purchase of semiwaste land and bringing i.t back to prairie condition in a few year's time." Frequently since that time various recommendations for purchase have been made by citizens to the State Conservation Commission. Among objections raised by the public was that of taking potentially productive land out of cultivation, for the grassland is the most valuable of the arable lands in Iowa. However, it can be shown that maintenance of productiYity and fertility in cultivated soils is at tributable to scientific knowledge qerived from the study of plants and soils. The production of cultivated crops requires persistent at tention, but the native plants when undisturbed are able to establish. adjust, and reproduce themselves indefinitely without culture or re seeding. In the past twenty-five years researches on the contribu tions of native plants to !?Oil making and studies concerning collective occupation of the soil has opened the way for application of these principles to grazing management. Only experimental beginnings have thus far been made in the economic use of native plants, yet the native plants constitute the vegetation which has through the ages been instrumental in impregnating the once •sterile glacial and wind laid rocks and minerals with organic matter. Practically all of Iowa's • A report prepared for the Iowa State Conservation Commission relating to their program for conservation of prairie and also adopted by the Conserva tion Committee of the Iowa Academy of Science as a supplement to its Prairie Project. 128 IOWA ACADEMY OF SCIENCE [VOL. 52 crop plants are of Eur-Asian origin and are grown locally in environ ments foreign to them. THE COVERLESS PRAIRIE SOIL PRODUCTIVITY AND SOIL CONSERVATAON When ·the pioneers first turned the sod of Iowa, they were thankful for a harvest which afforded a moderate living, for many had r:ome from regions of earlier settlement depleted by the uncom pensated tillage of many gen~rations where the soils had at last lost such fertility as they had. In the past twenty years the productivity of crop plants has been improved by scientific workers who, through experiments in selection and crossing of cultivated plants, have de veloped strains which are adapted to diverse conditions, increased productivity, and resistance to attacks by parasites. However, as production increased failure to insure anchorage of the surface soils against depletion by sheet erosion and gullying resulted in the loss of organic matter in the top soils. To such an extent has the surface soil been removed in the earlier settled parts of the state that years will be required to restore its productivity, if it can be accumplished at all in certain areas. Nevertheless ,improved methods of culture such as the introduc tion of hybrid corn seed has materially increased the harvest of corn. Yet of all the factors mentioned- selection of crop, adaptation of strain, controlled fertility, and improved production are variables approaching a limit-the limit of maximum production. Yet maxi mum production on virgin prairie soil is far different from maximum production on depleted soil. The former permits a high level of in come, while the latter portends a decline in resources. THE H AZARD OF EROSION In the hundred years which have elapsed since the white man wrested the grassland from the red man relatively few people who tilled the soil realized that particle by particle the surface soil was slipping away, water transported beyond the bounds of Iowa. Though erosion is a process of nature long recognized by the geologist and the soil scientist, the layman is frequently unconscious of his con tribution to this process. The seriousness of the depletion of 'the soil by erosion in Iowa has become widely realized only within a decade, though it has been continuous since the removal of the cover by the early settlers, and accelerated by ordinary cultivation. Stevenson (1910-1914) has discuss!!d this subject in R eports of the Experiment Station as early as 1910. The greatest impetus to erosion in recent years has been the first world war whose food requirements stimu lated increased food production leading to the cropping of even sub" marginal lands. The unprecedented acreage of soil bared of its grassy protective cover during a period of severe drought, demonstrated 1945] PRAIRIE AREAS IN IOWA 129 through the impressive action of the prolonged dust storm that a major error in land management had been made. And it will not be corrected in one lifetime. If knowledge of soil classification, com position, characteristics, and care will solve the problem of soil preservation, the literature of the Soil Survey of Iowa covering 82 of the 99 counties, the monographs of Iowa Soils (Brown, 1936) and Soil Erosion in Iowa (Brown and Walker, 1936) as well as a series of research bulletins should furnish ample information. But infor mation does not disseminate itself. Nor do informed persons prac tiee their doctrines as is commonly illustrated by scanning the land scape. A chance-made, unchecked cowpath may start a gully which will in time carry off the surface of the adjacent hillside. A path traced by the inertia-weighted feet of many pedestrians soon becomes an unsightly dit ~h across the grassy lawn. The straight coursed, silt laden brook widens into a winding stream of increased transporting capacity. And so the soil slips away in a seemingly commonplace manner, when no one is looking. Unless the man is taught to see the dynamics of his environment in the days of youth perhaps there will be too few mature citizens who are trained to recognize van ishing soil and to exercise initiative in its preservation. TRENDS IN CONSERVATION With a second world war severely taxing our resources and world recovery in all probability setting a new level for food production, the comment of the Federal Secretary of Agriculture (Wickard, 19,!4) at the Ninth North American Wildlife Conference is timely: We are at the crossroads in our history in so far as our natural resources are concerned. Either we take the uphill road to conserva tion and restoration or the downhill road to further exploitation and eventual ruin. The decision as to which course we shall pursue is clearly up to us. At the same conference Ira N . Gabrielson, Secretary of the De partment of Interior stated: During recent years there has been increasing criticisms of the acquisition of lands for public purposes .. it may nevertheless still be advisable for the general good for public agencies to acquire ad ditional lands. The resolve to acquire some tracts of native prairie with its typical .soil associations in virgin state constitutes a safeguard to the wel fare of the research program in Iowa which represents t.he corner stone of her economic welfare. It is obviously in accord with the federal plan of conservation. THE VALUE OF PRAIRIE PRESERVES THE RECOMMENDED PRESERVE The original recommendation for prairie preserve specifies that 130 IOWA ACADEMY OF SCIENCE [VOL. 52 the area should "save the characteristic landscape, wild flowers and wild life of the native prairies." This simple, objective statement is very comprehensive for the wild flowers include not 'only the grasses but the broad-leaved flowering herbs of the major types of vegetation on which the a nimal life depends for food and shelter. To the land scape belongs the soil in which the plants are anchored with !ts diver!le topographic variations in slope, and conformity of the earth's surface. The particular location in which a plant may live depends on such environmental conditions as composition, structure, and moisture of the soil, the intensity of life, the exposure to wind, and competition with other plants for the essentials of life. THE APPEARANCE OF PRAIRIE LANDSCAPE Th(' landscape of the prairie is characteristic. Though the topo graphy is intact, few examples of the prairie vegetation remain. In the early days of spring when the last snowbank has melted away from the reddish-brown grassland, myriads of lavender pasque flow ers lend a bluish cast to the gravelly knolls of the rolling northern prairies.