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I have a term paper due next week Dec 5 2012. i have a part of it written but not edited well. I have the articles to help you finish the paper. The topic is kinda boring but its almost done. The paper is about Ground Water Levels in the San Luis Valley and the effect of prolonged water draw back has on the plant communities in the San Luis Valley, Co
the discussion should look like this. I was just forming ideas
The water table from 1990's through 2010 experienced annual and interannual variation due to natural patterns of precipitation and ground water recharge. While, droughts throughout the 2000's and late 1990's have lowered the average water table depth of the SLV; the steady water pumping from the closed basin project has had more of an impacted on the steady decline of the WTD. The water table average started at .92m changing to a average of 2.50m below the surface. The CSU researchers noted that there was a negative correlation between ET and WTD during the study periods. Cooper (2003) note that during the post-drawdown period there was a 32% total decrease in annual ET while, the annual ETg decreased by 62% from the mid-1980. During the dry season, the ET was 48% less pre-drawback. Water tables within 2m of the surface have shown to have enough capillary action to keep shallow root plants alive (Cooper 2003).
Out of the shrubs species studied, S. vermiculatus showed the most notable changes in Xp during the natural seasonal and experimentally altered changes in soil water content. The Xp of S. vermiculatus would increase after monsoon events. S. vermiculatus has adapted different diverse startegies in acquiring water. It can use groundwater and rain water making S. vermiculatus able to colonize areas that once was cover in grass. E. nauseosa held a reasonably constant Xp throughout the study period, despite differences in the natural and controlled sites. The grass on the other hand showed significant change in X to the natural weather and rain out shelter experiments. Both species acquire most of their water comes from the upper layer of soil moisture.
All you have to do for the discussion is paraphrase the discussions of the other articles that I sent you.
Then I guess my conclusion would be something about shrub species that are able to utilize groundwater and precipitation could crowd out grass species. If the monsoon season drops in frequency for an extended period then S. vermiculatus could move into the areas once covered by grass. Since, the data shows that S. vermiculatus has the ability to obtian water from various sources.