第二代杉木人工林氮、磷、钾的吸收、积累和迁移

Absorption, Accumulation and Transportation of N, P, K Elements in the Second-Generation Chinese Fir Plantation

通过定位观测获得数据 ,对 11年生第 2代杉木人工林中 N、P、K的吸收、积累和迁移作了系统研究 .杉木各器官中 N、P、K吸收量高低顺序为 N>K>P.杉木林中 N、P、K总贮量为 43 .0 5 4g· m- 2 ,其中 N为 2 5 .718g· m- 2 ,P为 2 .62 7g· m - 2 ,K为14 .70 9g· m- 2 .N、P、K元素的年吸收量为 7.2 62 g· m- 2 a- 1 ;年积累量为 4.83 7g·m- 2 a- 1 ,其中 N为 2 .90 1g· m- 2 a- 1 ,P为0 .2 95 g· m- 2 a- 1 ,K为 1.64 1g· m- 2 a- 1 ,年归还量为 2 .42 5 g· m - 2 a- 1 ,占年吸收量的 3 3 .3 9% .N、P、K元素的周转期分别为 19a、2 8.9a、15 a,流动能力以 K>N>P为序 ;富集率 N为 1.3 6,P为 1.2 2 ,K为 1.47,迁移速度以 K>P>N为序 .与同龄第 1代杉木林相比 ,第 2代杉木林中 N、P、K元素的迁移、循环速率较慢 .

Based on the data collected from located observation, the study of the absorption, accumulation and transport of N, P, K in the second generation 11 year old Chinese fir plantation showed that the absorption of N, P, K elements in different organs all was in the order as: N>K>P. The total storage of N, P, K was up to 43.054 g·m -2 , of which N was 25.718 g·m -2 , P 2.627 g·m -2 , and K 14.709 g·m -2 . The annual absorption of N, P, K was up to 7.262 g·m -2 a -1 , the annual accumulation of N, P, K was 4.837 g·m -2 a -1 , of which N, P, K was respectively 2.901 g·m -2 a -1 ,0.295 g·m -2 a -1 and 1.641 g·m -2 a -1 . The total return was 2.425 g·m -2 a -1 , accounting for 33.39% of the annual absorption. The recycling period of N, P, K was 19, 28.9 and 15 years, respectively; the ability to move was in the order as: K>N>P. The enrichment ratio of N, P, K was 1.36, 1.22 and 1.47 respectively; the velocity to transport was in the order as: K>P>N. The transporting and biologically cycling ratio of N, P, K of the second generation was lower than that of the first generation for Chinese fir plantation at the same age.