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探讨了福建三明莘口教学林场 3 4年生的木荚红豆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、Ca、Mg含量差异显著 ,其月动态也不同 .1999年 ,木荚红豆人工林通过凋落物归还土壤的 N、P、K、Ca、Mg分别为 61.5 68、1.766、2 3 .2 19、3 3 .92 9、6.60 4kg· hm- 2 ,落叶是养分归还的主要组分 ,木荚红豆 N和 K年归还量明显比针叶林的大 ,这对维持林地的长期生产力具有重要意义 ;凋落物的 N、P、K、Ca、Mg总归还量间的月动态相似 ,均在 3月和 8月出现高峰 ,以 3月最高 ,以 1月最低 ;各组分养分归还量的月动态与总归还量略有不同 ,养分总归还量的季节变化模式为春季 >夏季≈秋季 >冬季 .
The nutrient characteristics and its dynamics of litter in the plantation stage of 34-year-old in Podocarpaceae were studied in Sanming Xinming Teaching Forest Farm, Fujian Province. The results showed that the content of N, P, K, Ca and Mg in the components of litter was significantly different. Dynamic.Among them, the N, P, K, Ca and Mg returned to the soil by litter in 1999 were 61.568, 1.766, 23.32, 19.33.992, 9.66 and 104kg · hm - 2. The deciduous leaves are the main components of nutrient return. The annual return of N and K in red legumes is obviously larger than that in coniferous forests, which is of great importance to maintain the long-term productivity of woodland. The N, P, K, Ca , And the monthly dynamic of Mg return was similar, both of which peaked in March and August, the highest in March and the lowest in January. The monthly dynamic of total nutrient return of each component was slightly different from the total return, The seasonal variation patterns of return are spring> summer ≈ autumn> winter.