低NPK胁迫对橡胶树实生苗新生叶蓬NPK含量的影响

Effect of Low NPK Stress on NPK Content in Rubber Seedlings Leaf

以橡胶树3个品种(GT1、RRIM600、PR107)实生苗为材料,研究正常施肥到低NPK胁迫和恢复正常施肥过程中叶片NPK含量的变化。结果表明:橡胶树实生苗新生叶蓬叶片NPK含量与NPK亏缺与否和胁迫处理的时间密切相关,且胁迫后的缺素状况可通过适时恢复正常施肥得以缓解或改善;叶片N、P、K含量出现降增的时间及幅度有所不同,其中N素的响应较快,P素次之,K素最为缓慢;在低NPK胁迫情况下,N、P、K素间存在不同的互作现象;不同品种叶片养分含量的变化趋势基本一致,但耐受低NPK的胁迫能力及恢复能力有所不同,RRIM600较为敏感,PR107次之,GT1较不敏感。

The leaf NPK content of Hevea brasiliensis seedling was studied under low-NPK stress and regular fertilizing with rubber clone GT1, RRIM600, PR107 as material. The results showed as follows. The leaf NPK content of leaf-umbrella, which regenerates after the treatment, was closely related to the component and processing time of low-NPK stress treatment and the symptom of nutrient deficiency would be alleviated or improved by timely and regular fertilizing. The onset time and the degree of decrement and increment were different between the leaf N, P, K content, in which the response of N element was the fastest, P element next and K element the slowest. There were different interactions among elements of N, P and K under low NPK stress. The variational trends of leaf nutrient content under treatment were basically the same of all three clones, but the tolerance and resilience capacity to low NPK stress were different, in which RRIM600 was more sensitive, PR107 next, GT1 was less sensitive.