福建柏人工林凋落物的养分动态特征

Litterfall nutrient dynamics in Fokienia hodginsii plantation

探讨了福建三明莘口教学林场 33年生的福建柏人工林凋落物的养分特征及其动态.结果表明:凋落物各组分中N、P、K含量差异显著,其月动态也不同;福建柏人工林N、P、K通过凋落物归还土壤,年归还量分别为 51. 275、2. 794、29. 416kg·hm-2;落叶是养分归还的主要组分;福建柏N和P年归还量明显比杉木林及其他针叶林大,这对维持林地的长期生产力具有重要意义;凋落物的N、P总归还量的月动态相似,均在 5和 12月份出现高峰, 12月份最高, 10月份最低;各组分养分归还量的月动态与总归还量略有不同.

This paper deals with the nutrient characteristics and dynamics of litterfall of a 33-year-old Fokienia hodginsii Henry et Thomas plantation located in Xinkou Teaching Forest Farm, Sanming, Fujian Province. The result shows that concentrations of N, P, and K differs significantly among litter fractions, and monthly dynamics of N, P and K elements in fractions are also different from each other; and the annual nutrient return through litter amounts respectively to 51.275 kg·hm^(-2) N, 2.794 kg·hm^(-2) P, (29.416 kg·hm^(-2) )K, and the main return of nutrients is through leaf litter; and annual N and P return are obviously higher than Chinese fir plantation and other coniferous forest, which benefits the maintenance of long-term site productivity in the stand. The dynamic of total nutrient return are similar among N and P elements, whose peaks appeared in May and December, highest in December and lowest in October. The monthly dynamics of nutrient among fractions are different from those of total nutrient return.