The Land Condition Trend Analysis (LCTA) program was developed by the US Army and implemented on Fort Riley, Kansas, to monitor trends in plant communities so that managers could maintain quality training lands without the loss of ecological diversity. As a standard protocol, vegetation surveys using the point-intercept method were conducted from 1994–2001. Presence of bare ground, soil erosion, and military vehicle traffic were also recorded. At the community level, species richness usually fluctuated < 10% annually and declined 6% from 1994–2001. Species richness per plot increased from 1994 to 2001 by 6.5% as compared to the 1994 estimate. Annual species richness of noxious plants ranged from 18–26 species; noxious species per plot averaged 1.0–2.4 species annually with higher estimates usually observed in grassland (vs. woodland) habitats. Modest year-to-year changes were noted at the species level for the most frequently observed species based on an index of relative difference. Two noxious plant species, sericea lespedeza (Lespedeza cuneata) and Johnsongrass (Sorghum halepense), first detected during the second year of monitoring, expanded their distribution considerably on the fort. This expansion may have resulted when mechanized training facilitated transport of seed on vehicles from one training area to another. The patterns of expansion (both on a plot and on a training area basis) by these two noxious species revealed that our analysis approach may be useful for detecting early stages of infestations on this highly disturbed landscape. Bare ground conditions increased on an average of 1.5% per year, but may not be completely attributable to military training activities. Because there appears to be little year-to-year fluctuation in the diversity of the plant communities and trends for most individual plant species monitored on Fort Riley, we recommend detailed plant surveys not be conducted annually. An exception would be monitoring of noxious plant species with a method other than the point-intercept technique, which is extremely time-consuming.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 109 • No. 3