不同年龄橡胶树PR107养分利用效率研究

Nutrient Use Efficiency of Clone PR107 at Various Age

以橡胶无性系PR107为材料,研究不同年龄段（228 a）橡胶树对矿质养分N、P、K、Ca、Mg的利用效率,同时比较了不同树龄和不同器官的养分利用情况。结果表明：（1）橡胶树不同器官对养分的利用效率高低顺序为：树干〉胶乳〉树根〉树枝〉树皮〉树叶;（2）橡胶树体对5种养分元素的利用效率大小顺序为：P〉Mg〉K〉N〉Ca;（3）中幼龄树（414 a）由于树体生长代谢旺盛,养分利用效率也较高,而老龄树（2228 a）养分利用效率则较低。

The nutrient use efficiency（NUE）of mineral elements（N,P,K,Ca and Mg）in rubber trees（Hevea brasisiliensis）of clone PR107 at varioust ages,from 2 to 28 yr,was determined,and the NUE of various age PR107 and organs were analyzed and compared.The main results showed that： 1）the order of NUE of different organs in clone PR107 was： trunk〉latex〉root〉branch〉bark〉leaf.2）the order of NUE of five kinks of main mineral elements for clone PR107 was P〉Mg〉K〉N〉Ca.3）the young and mid age clone PR107,414 yr,had a higher NUE than that of older trees,2228 yr,because of the former with active metabolism and growth.However,the latter had a lower NUE.