Response of grass growth when grass strip subjected to burying stress

in International Symposium (oral presentation paper), 國際研討會(全文口頭發表)
標題Response of grass growth when grass strip subjected to burying stress
AuthorsWu, 吳嘉俊
出版日期May 8 2008 12:0

Grass strip is one of the common practices implemented in soil conservation. It not only helps trap sediment from upland, but also assists in pollutant removal. By taking the full load of sediment that transported by surface runoff, grass strip is often subjected to burying stress caused by overtopping of sediment. Therefore, the objective of this research is to assess grass responses to such environmental stress.
This research was conducted at USLE (Universal Soil-Loss Equation) standard runoff plots situated at National Pingtung University of Science and Technology. Total of 7 grass species were used in the burying-stress tests. The depths of soil that dumped on test blocks considered as burying stresses in this research included 50mm, 150mm, and 250mm. Three replications were used for each combination of grass species and burying depths; therefore, total of 63 test blocks were constructed. Tensiometers were installed at selected test blocks for soil suction potential measurements. Digital photos were taken from each test block for image analysis to quantitatively assess the changes of grass growth. The entire field test lasted for two months.
All test grasses could easily penetrate 5mm bury layer and resume the normal growth. As bury layer increased to 150mm, Carpet grass, Centipede grass, and Tropical carpet grass did not survive from burying stress; whereas, Manila grass, St. Augustine grass, Wedelia, and Bermuda grass, successfully re-surfaced by rapid growth in stolons. As bury layer increased to 250mm in depth, Bermuda grass was the only grass that overcome the burying stress. Wedelia illustrated different way of overcoming the burying stress; not by penetrating the layer but by increasing stolon growth and creeping along the bury surface to quickly establish new settlement. This research reaches the conclusion that Bermuda grass, Manila grass, and Wedelia has high stress resistance during nearly 2-month burying test.

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