滩地地下水位对钉螺分布密度和Ⅰ-72杨生长量的影响

Effects of Beaches' Underground Water Level on Snails' Distribution Density and Growth of Poplar I72

研究了滩地地下水位在动态情况下对钉螺的分布密度和Ⅰ－７２杨生长量的影响。结果表明，地下水位的不同，钉螺密度呈五带分布，即一条密螺带、两条多螺带和两条稀螺带。建立了地下水位与钉螺分布密度的回归方程ｙ＝－１．９６８６＋０．２５１１７４７ｘ－０．００４０１３ｘ２，ｒ＝０．８６０９８，有明显的相关。地下水位３０ｃｍ深时，地表钉螺分布密度最大，２０、４０ｃｍ次之，１０、５０ｃｍ最小。地下水位也影响Ⅰ－７２杨年平均胸径和树高的生长量，经方差分析和Ｑ检验差异显著。为今后滩地发展Ⅰ－７２杨提供高效的栽培模式。

The effects of beaches' Underground Water Level (UWL) on both snails distribution density and the growth of poplar I72 were studied in this paper.The results showed that snails' density was different on different beaches of various UWL.The snails' density on beaches with UWL about 30 cm was the highest,that on beaches with UWL near 20 or 40 cm the second,and that on beaches with UWL less than 10 cm or more than 50 cm the lowest.Moreover,the average diameter and height of poplar I72 were also strongly inflenced by beaches' UWL.