The impact of Japanese knotweed on stream baseflow

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

The impact of invasive plants on stream baseflow has mostly focused on water-limited areas such as South Africa and the southwestern region of the United States. However, there is evidence suggesting that rivers in areas traditionally considered to be water-rich (e.g. the northeastern United States) will be facing water shortages in the foreseeable future. Consequently, it is imperative to understand what impact invasive plants in this region may have on river baseflows. In early June 2008, pressure sensors to monitor stream depth were placed upstream and within a stretch of river containing Japanese knotweed on the bank. Knotweed daily photosynthesis, stomatal conductance, and transpiration patterns were recorded during the course of two day-long periods at the end of July, 2008. At the beginning of August 2008, all of the knotweed plants in the study area were cut at the base and their leaves were harvested to determine total leaf area for the site. Pre-harvest stream water levels were found to be significantly lower than post-harvest stream levels within the stretch containing knotweed. In contrast, in the upstream location, baseflows decreased between pre-harvest and post-harvest. Furthermore, on the basis of the physiological measurements and total leaf area, it was estimated that the plants in the study area removed through transpiration about 1556l or 10.4mm of groundwater per day from the system. These findings suggest that the presence of knotweed within riparian habitats may have even more deleterious effects on water resources than previously considered and merit future research.

Original languageEnglish
Pages (from-to)881-886
Number of pages6
JournalEcohydrology
Volume7
Issue number2
DOIs
StatePublished - 1 Jan 2014

Fingerprint

Reynoutria japonica
baseflow
transpiration
leaf area
rivers
river
Northeastern United States
water shortages
stomatal conductance
water resources
water
surface water level
photosynthesis
groundwater
water level
South Africa
water resource
sensor
harvest
monitoring

Keywords

  • Invasive plants
  • Japanese knotweed
  • Stream baseflow
  • Transpiration

Cite this

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title = "The impact of Japanese knotweed on stream baseflow",
abstract = "The impact of invasive plants on stream baseflow has mostly focused on water-limited areas such as South Africa and the southwestern region of the United States. However, there is evidence suggesting that rivers in areas traditionally considered to be water-rich (e.g. the northeastern United States) will be facing water shortages in the foreseeable future. Consequently, it is imperative to understand what impact invasive plants in this region may have on river baseflows. In early June 2008, pressure sensors to monitor stream depth were placed upstream and within a stretch of river containing Japanese knotweed on the bank. Knotweed daily photosynthesis, stomatal conductance, and transpiration patterns were recorded during the course of two day-long periods at the end of July, 2008. At the beginning of August 2008, all of the knotweed plants in the study area were cut at the base and their leaves were harvested to determine total leaf area for the site. Pre-harvest stream water levels were found to be significantly lower than post-harvest stream levels within the stretch containing knotweed. In contrast, in the upstream location, baseflows decreased between pre-harvest and post-harvest. Furthermore, on the basis of the physiological measurements and total leaf area, it was estimated that the plants in the study area removed through transpiration about 1556l or 10.4mm of groundwater per day from the system. These findings suggest that the presence of knotweed within riparian habitats may have even more deleterious effects on water resources than previously considered and merit future research.",
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The impact of Japanese knotweed on stream baseflow. / Vanderklein, Dirk; Galster, Josh; Scherr, R.

In: Ecohydrology, Vol. 7, No. 2, 01.01.2014, p. 881-886.

Research output: Contribution to journalArticleResearchpeer-review

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