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|標題:||Screening of Vegetation Materials for Slope Land Restoration in Mudstone Area-Salt-tolerance Mechanism of Suaeda Nudiflora
Mudstone is one of the problem soils regarding soil and water conservation in Taiwan. High salinity in surface soils hinders vegetation growth in the drought season. The purpose of this study is to introduce halophyte as vegetated buffer strips at the mudstone slope land. Sporobolus virginicus, Sesuvium portulacastrum and Ipomoea pes-caprae were selected to plant at the pilot experiment in Wu-Shan-Tou reservoir watershed. A simplified vegetation engineering method with comprehensive treatment providing functions of vegetation filtering, drainage and moisture storage system applying on the mudstone slope land is introduced in this study.
Due to the obvious guttation observed from the leaves of Sporobolus virginicus at the field pilot experiment, pot experiment with sequence of NaCl treatments (0,100,200,300,400 mmhos/cm) were used to further study the mechanism of Sporobolus virginicus in salt-tolerance. The results were summarized as follows:
Sporobolus virginicus develops vigorously under the non-salt treatment and has higher coverage comparing to that with NaCl treatments. Curling leaves were formed to adapt the higher salinity as the concentration of NaCl increasing to 100 and/or 200 mmhos/cm. Sporobolus virginicus were partly withered as the salinity increasing to 300 and/or 400 mmhos/cm. Tissue analysis shows that sodium and calcium concentration of salt treated plant was higher than those of non-salt treated one. The maximum concentration of sodium and calcium in Sporobolus virginicus tissue were 74700 ppm and 3970 ppm; respectively, and the excessive salts were excreted under the higher salinity treatments. Salt treated plant has the symptom of hindering the uptake of potassium and magnesium. Using salt gland to excrete the excessive salts is the main mechanism for Sporobolus virginicus to adapt the environment with high salinity.
|Appears in Collections:||水土保持學系|
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