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z. <br />M1~M: <br />~~. ~ i <br />rti . <br />N :~ ., <br />~` <br />~~ ,~~,.. <br />~ ~. <br /> <br />u <br />economic value, they prove to be the best stabilizing cover <br />for water sheds and recreation. <br />In order for the community to arrive at the <br />dynamic equilibrium of the climax community described, it <br />has undergone a series of progressive developments that <br />include: 1) differentiation of the soil toward the final <br />community composition 2) plant community diversity and <br />differentiation 3) increase in overall productivity. <br />The Woodland Shrub community is a stable but also <br />a fragile one. It has taken a lengthy time to establish <br />the climax community; particularly in environmental conditions <br />of little rainfall throughout the year in the Chaffee County, <br />Colorado region. <br />It is known that this successional process may be <br />reversed by disturbing a community. <br />The quarry operations have created overburden <br />which is a subsoil from various depths. This overburden has <br />been placed over existing top soil and has therefore subsitu- <br />ted a weathered, mature soil with one less affected. The <br />chemical analysis of the soils involved reveals this fact. <br />Concentrations of sodium in the overburden will effect plant <br />growth deleteriously. But weathering processes will cause <br />the sodium to migrate to lower layers. The nitrogen content <br />is obviously absent or in very low concentration in the <br />overburden. And nitrogen is a necessary primary nutrient for <br />plants. The other elements examined were generally similar <br />in concentration. Because the vegetative reconstruction is <br />occurring in an arid region with a community that has taken <br />many years to become stable and established, any plan for <br />reconstruction must take this into account. Native vegeta- <br />tion of juniper or pin~n pine is not practical if community <br />stability is sought. With these thoughts in mind, the <br />following recommendations are presented: <br />1) The overburden on the east and west should be <br />contoured or terraced to diminish the possibility of erosion <br />before vegetation can stabilize the soil. <br />2) A seeding program, employing a native grass <br />perhaps Blue Gramma grass should be initiated to help provide <br />cover for the first few reasons during the reconstruction. <br />3) A native shrub, perhaps oak, should also be <br />planted to help the inherent natural progression of plant <br />life proceed more quickly into the disturbed area. <br />Left to itself, plant life will re-enter the <br />disturbed area. Siqns of this are present in areas less than <br />a year old with the invasion of certain weed varieties. <br />-5- <br />