Abstract
In the southwestern US, the composition and abundance of riparian plants has changed as a result of flow regime alteration and the invasion of Tamarix. We investigated trends in vegetation dynamics along the Green and Colorado Rivers in Canyonlands National Park (CNP) from 1976 to 2008 through historical aerial photo analyses. We also explored the relationships between understory and overstory species in riparian habitat of CNP. The effects of river regulation on seedling establishment patterns were assessed in slightly regulated, moderately regulated, and extremely regulated river sections in the southwestern US. Tamarix dominated the overstory vegetation in all river sections in CNP but was less dominant along the Colorado (73% vs. 83%-86% for the Green and Cataract sections). Overstory-understory relationships were generally quite weak, although species commonly found with Tamarix included Bromus tectorum, Distichlis spicata, and Sporobolus spp. Seedlings of Tamarix and Salix exigua were abundant, with the latter being far more abundant than below the Glen Canyon Dam in Grand Canyon. However, seedlings of Populus fremontii and Salix gooddingii were rare. Apparent differences in the affinities of Tamarix and Salix exigua for certain soil characteristics including pH, conductivity, and relative concentration of ammonium are difficult to interpret without complementary experimental studies.
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Claims 7
Claim · model-written summary
Tamarix dominated the overstory in all CNP river sections but less along the Colorado than Green and Cataract sections.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_flowers_..._(52075564504).jpg?width=500)
Verbatim
e0“Tamarix dominated the overstory vegetation in all river sections in CNP but was less dominant along the Colorado (73% vs. 83%-86% for the Green and Cataract sections)”
Claim · model-written summary
Overstory–understory relationships were generally weak.
Not reportedDirection
Verbatim
e0“Overstory-understory relationships were generally quite weak”
t0“PLANT COMMUNITY”
Claim · model-written summary
Bromus tectorum, Distichlis spicata and Sporobolus spp. commonly occurred with Tamarix.
- Interactor
- Bromus tectorum
Bromus tectorume0other - Second interactor
- Distichlis spicata
.jpg?width=60)
Distichlis spicatae0other - Outcome
- species commonly found with Tamarixe0
- Qualifier
- Sporobolus spp.e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“species commonly found with Tamarix included Bromus tectorum, Distichlis spicata, and Sporobolus spp.”
Claim · model-written summary
Tamarix and Salix exigua seedlings were abundant.
- Taxon
- Tamarix and Salix exigua
_flowers_..._(52075564504).jpg?width=60)
Tamarix
Salix exiguae0 - Organ / stage
- Seedlingse0
- Outcome
- abundante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Tamarix and Salix exigua were abundant”
Claim · model-written summary
Salix exigua seedlings were much more abundant than below Glen Canyon Dam.
- Taxon
- Salix exiguaSalix exiguae1
- Organ / stage
- Seedlingse1
- Outcome
- far more abundante0
- Direction
- far more abundante0
- Comparator
- below the Glen Canyon Dam in Grand Canyone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with the latter being far more abundant than below the Glen Canyon Dam in Grand Canyon”
e1“Seedlings of Tamarix and Salix exigua were abundant”
Claim · model-written summary
Populus fremontii and Salix gooddingii seedlings were rare.
- Taxon
- Populus fremontii and Salix gooddingii
Populus fremontii
Salix gooddingiie0 - Organ / stage
- seedlingse0
- Outcome
- raree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings of Populus fremontii and Salix gooddingii were rare”
Claim · model-written summary
Apparent soil characteristic affinities of Tamarix and Salix exigua remained difficult to interpret without experiments.
- Taxon
- Tamarix and Salix exiguaTamarixSalix exiguae0
- Outcome
- affinities of Tamarix and Salix exigua for certain soil characteristicse0
- Qualifier
- difficult to interpret without complementary experimental studiese0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apparent differences in the affinities of Tamarix and Salix exigua for certain soil characteristics including pH, conductivity, and relative concentration of ammonium are difficult to interpret without complementary experimental studies”