锥栗人工林营养综合诊断(DRIS)研究

通过对8 a生锥栗人工林叶片5种营养元素的分析,运用DRIS诊断法对该树种的养分状况进行了诊断分析.根据林分现实产量的差异,划分3种不同的产量类型,将每种类型产量和相应的叶片营养含量结合考虑,能够对锥栗人工林分养分的丰缺状况作出适宜的判断.以高产量类型作为最适值,诊断的结果是中产类型的N元素相对过量,K则相对不足;低产类型N、P含量明显不足,应予以补偿.

STUDIES ON NUTRIENT SYNTHETIC DIAGNOSIS (DRIS) FOR CASTANEA HENRYI PLANTATION

DRIS diagnosis method was used to diagnose the nutrient status of Castanea henryi plantation, based on the analyzing five nutrient elements in leaves of Castanea henryi plantations at 8 years old. Castanea henryi plantations stand were divided into three types according to the difference in real stand yield. The results showed that DRIS method could distinguish the balance state of the various elements and to determine the sequences of fertilizing, by considering the yield of each type stand and their nutrient content in leaves. When the high yield type stand was regarded as optimal value, the diagnosing results were that N element in middle-yield type stand was high but K element was low relatively; contents of N and P element in low-yield type stand was low obviously, so they had to be compensated.