Cold Resistance And Applied Research Of Two Native Petrophile Plants

Two native petrophile plants (Pogonatherum paniceum(Lam.)Hack) and (Eriophorum comosum Nees) are studied, comparing to bermudagrass (Cynodon dactylon) that is usually applied on the slope eco-engineering. In order to gain good plants Applied on Slope Eco-engineering, physiological, biochemical and morphological structure change of two petrophile plants during cold stress are researched, moreover, applied research are done on man-made slope. There are experimental results as follows:(1) Eriophorum comosum Nees shows strong cold resistance in plasmalemma permeability research. The lethal temperature of Eriophorum comosum Nees is the lowest (LT₅₀) in comparison with another two plants and is lower than -11.5℃ in August 2005 and December 2005; Soluble protein content of each plant is rising before or after cold hardiness. By SDS-PAGE, Protein band is analysed. Band quantity of Eriophorum comosum Nees is the most and its band color is darkest.(2) Soluble sugar content of three plants after cold hardiness are higher than before cold hardiness, moreover soluble sugar content after cold hardiness shows a decline and there is a narrow range in Eriophorum comosum Nees; Free Proline accumulation is changed by cold stress, and cold resistance is relative to free Proline accumulation; chlorophyll content of both three plants, including chlorophyll a, chlorophyll b and chlorophyll a/b, show a decline tendency along with the descent of temperature. Cynodon dactylon is highly sensitive to cold stress.(3) The soil POD and urease activities' absolute value of Erioophorum comosum Nees and Pogonatherum panideum(Lam.)Hack were more than that of Cynodon dactylon before or after low temperature stress, especially POD activities.(4) The factors of seed quantity are analyzed. Reasonable seed quantity is determined: Pogoatherum paniceum (lam.) Hack (0.3043g-0.4226g/m²), Eriophorum comosum Nees (0.2722g-0.3778g /m²). The frictional effect between plant vertical root system and epidermal rock builds the ' Plant- soil- rock system'. This system can prevent water-soil erosion. Compared to the control Cynodon dactylon, the two native petrophile plants had higher soil erosion resistance index.