应用32P对马尾松、黎蒴栲种间关系的研究*

应用＾３２Ｐ分别对马尾松、黎蒴栲混交林及马尾松纯林树种根系的吸收能力进行研究。结果表明：不同林分结构中树种对Ｐ的吸收能力有差异，大小顺序为：混交林黎蒴栲＞混交林马尾松＞纯林马尾松。应用＾３２Ｐ研究马尾松，黎蒴栲的异株克生作用，结果表明：（１）黎蒴栲的根及其它器官组成的７种试验液对马尾松苗叶子的＾３２Ｐ水平有提高作用：马尾松的枝、根等５种试验液则对黎蒴栲苗叶子的＾３２Ｐ水平也有提高作用。（２）两个树

Study on Species Relationship between Pinus massoniana and Castanopsis fissa Using 32P

P was used to study the absorptivity of the roots from Pinus massoniana andCastanopsis fissa mixed forest and the pure forest of P. massoniana. It showed that the orderof the ability to absorb 32P was C.fissa > mixed P. massoniana > pure P. massoniana. Theresults of allelopathy between these two species showed:(1)seven kinds of secretions pro-duced by the root and other organs of C.fissa improved the 32P level of leaves from seedlingsof P. massoniana. Five kinds of secretions produced by the branch,root and other organs ofP. massoniana improved the 32P level of leaves from seedlings of C. fissa;(2)the interact ofthe parts above ground of P. massoniana and C. fissa increased the absorbing ability of 32Pfor 4l.1%and 55.8%respectively as compared to their controls.