滨海沙土立地条件与木麻黄生长关系的研究

STUDY ON RELATIONSHIP BETWEEN SITE QUALITY CONDITIONS AND GROWTH OF CASUARINA EQIUSETIFOLIA ON THE COASTAL SANDY SOIL

探讨木麻黄林生长与立地因子的相互关系及木麻黄在滨海沙土不同立地条件的适生特性,确定影响木麻黄林生长的主导因子。滨海沙土可划分为潮积沙土和风积沙土2种立地类型。木麻黄在弱风区潮积沙土上生长量和生物量最高,泥炭性风积沙土居次,在均一性风积沙土和红壤性风积沙土上表现一般,在水化性风积沙土、强风区潮积沙土和不均性风积沙土上表现较差。微地形对木麻黄林生长也有显著影响,以海岸沙丘两侧生长最佳,低洼地带中等,沙丘顶部生长较差。逐步回归结果表明土壤速效磷、粗沙量、有机质含量、pH 值、细沙量、速效钾含量与木麻黄高生长之间关系密切,是影响木麻黄生长的重要因子。

Relationship between growth of Casuarina equisetifolia and site factors and the adaptability of Casu- arina equisetigolia to different site quality conditions were researched,and the major factors effecting on growing of Casuarina equisetifolia were determined.Coastal sandy soil can be divided into two types-the tidal and the eolian.Growth and biomass on the tidal sandy soil in weak wind area were highest;in peatful eolian sandy soil, were second;in homogeneous and red earth eolian sandy soil,were about up to the average;and in bydrated, tidal in strong wind area,non-homogeneous eolian sandy soils,were poorer.Mecrorelief also effected on Casu- arina growth:the growth on sides of dune was best,on Low-lying ground was second,on the top of dune was poor.The resuh of successive regression showed,that rapid available phosphorus,content of coarse sand,content of organic matters,pH-valus,content of fine sand and potassium in soil all were important effecting factors on the growth of Casuarina.