A synthesis on modern methods in rangeland ecohydrology I
DOI:
https://doi.org/10.34188/bjaerv8n1-103Resumo
Rangeland ecohydrology is an emerging and developing field that primarily deals with the nexus of rangeland ecosystems and the hydrologic processes that affect them. In the arid and semiarid rangelands of the American Southwest, capturing and retaining water is crucial to the overall health and functionality of floodplain grasslands. In the Southwestern U.S., the native grasses Big sacaton (Sporobolus wrightii) and Alkali sacaton (Sporobolus airoides) have historically dominated riparian floodplains, including those on the Altar Valley’s Buenos Aires National Wildlife Refuge (BANWR) near Tucson, AZ. However, issues of hydrologic connectivity have grown prevalent on the Refuge due to advancement of altered drainage pathways via channel incision and arroyo formation. Some of these incised channels likely developed due to failed (breached, scoured, or flanked) water retention and diversion structures put in by the U.S. Soil Conservation Service (SCS) in the early 1900’s as part of water infrastructure improvement efforts. Other considerations include land cover erosion due to overgrazing. As these channels further gully after sufficient rainfall the sacaton floodplain disconnects from available runoff via incised channels where ideal rainfall would once inundate floodplain grasslands.
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