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›› 1987, Vol. 23 ›› Issue (4): 389-397.

• 论文及研究报告 •    下一篇

杉木连栽对土壤肥力及其林木生长的影响

方奇   

  1. 中国林业科学研究院林业研究所
  • 收稿日期:1984-09-14 修回日期:1900-01-01 出版日期:1987-11-25 发布日期:1987-11-25

EFFECTS OF CONTINUED PLATING OF CHINESE FIR ON THE FERTILITY OF SOIL AND THE GROWTH OF STANDS

Fang Qi   

  1. Forest Research Institue, Chinese Academy of Forest
  • Received:1984-09-14 Revised:1900-01-01 Online:1987-11-25 Published:1987-11-25

摘要: 从常绿阔叶林皆伐烧垦后,到15年生头耕土杉木林,土壤肥力下降超过杉木连栽三个轮伐期的幅度。三耕土杉木林速生阶段林地土壤肥力低,林木生长差;杆材林阶段林相稀疏;林下植物生长繁茂,对土壤肥力提高起了积极作用。但杉木速生期已过,对促进杉木生长效果很不显著。常见于连栽杉木林下植物约有174种,适合很多亚热带乔、灌、草本都能正常生长繁殖的环境,证明仍然适合杉木生长。如果停止火烧清理迹地,实行局部整地控制水土流失,调整林分密度,使林地植被覆盖达到50—60%,可以收到维持或提高林地土壤肥力效果,有利于杉木永续经营。

Abstract: The continued planting of Chinese fir caused decrease in trees growth, druing 15 years old forest of the 2nd and 3rd times cultivation less 6.3% and 24.3% respectively in comparing with the first time cultivation. From the clear cutting of evergreen broad-leaf forests by burn and soil preparation to 15 years old the first time cultivation of Chinese fir forest caused the change of the soil fertility over three rotations as follows; the total amount of soil organic matter decreased by 45%; the total amount of N, P and K decreased by 38%, 42% and 32% respectively; the availability of N, P and K lessened 28%, 38% and 18% by order in rotations.The 3rd time cultivation of trees growing more slow, during the fast growing stage. Because the soil nutrients had been used in first two rotations. Therefore the stands of the 3rd cultivation was more open, thus influenced the ground vegetation, and the raising of soil nutrients, during the pole stage.There are about 174 specise in the stands of Chinese fir as undergrowth. The interspecific correlation coefficients of growth in every stands and in a certain stands showed Positive relation. Correlation coefficents of some species reached 0.4—1.0. In fact, continued planting of this species could not changed ecological environment for plant growth. The environmental conditions suitable for natural regeneration of subtropical evergreen borad-leaf forests and for the growth of many plants species also. If take effective steps to stop buring organic matter of the site, and carry out proper soil preparation in patches as well as control of water and soil erosion the site productivity can be maintained.Finally, accoding to physico-chemical properties of soil and topographical factors applied mathematical statisies forecasting stands periodical productivity of continued planting of this species significant value reached 0.81 of partial correlation coefficient.