李氏禾的水土保持特性及其在新丰江水库消涨带的应用

COMMON CUTGRASS: ITS CHARACTERISTICS OF SOIL CONSERVATION AND APPLICATION ON WATER-FLUCTUATION BELT AT XINFENGJIANG RESERVOIR

通过在新丰江水库岸坡消涨带植被恢复的试验研究,说明李氏禾具有抗旱耐淹耐瘠的生物学特性。保证李氏禾在水淹之前具有足够长的生长期,并采取适当的技术措施使其正常生长,水库消涨带植被恢复的问题就可以解决。对李氏禾在水库岸坡消涨带植被恢复中减少坡面径流,防止水土流失,改善生态环境,提升景观价值等进行了探讨,并提出李氏禾用于植被恢复进一步工作的设想。

The waterfluctuation belt is the land between high and low water levels along the bank, which often appears above and submerges under the water alternately. Because few plants can well grow in such environment that is either very wet or very dry, usually the belt appears as a bare slope and has serious soil erosion and other ecological problems.Common cutgrass (Leersia hexandra ) has been used as a plant to revegetate the waterfluctuation belt at Xinfengjiang Reservoir and has proved to be both droughtresistant and submergenceresistant. The grass can be effectively used to protect and improve the environment, to control soil erosion, and to enhance the aesthetic value of the waterfluctuation belt. Common cutgrass was planted on the waterfluctuation belt with the norm of 40cm×40cm in 2000. Observation has been made for 3 years. It shows that common cutgrass can grow well on the belt if proper measures are taken to ensure the strong growth of the plant before water submerges it. When the water level goes down, the reemerging grass regenerates new seedlings quickly and grows well even in dry weather and poor soil conditions. After revegetation, the surface runoff can be reduced by over 50% in light rain and 30% in heavy rain, and soil erosion can be reduced by 97% at any rainy time. Further more, the microenvironment becomes better.There is a large area of water fluctuation belts in China which usually are bare and need revegetation, therefore, further study on common cutgrass and its application to the revegetation of the fluctuation belts is of great importance. 