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林业科学 ›› 2000, Vol. 36 ›› Issue (1): 9-14.doi: 10.11707/j.1001-7488.20000102

• 论文及研究报告 • 上一篇    下一篇

四川盆周山地杉木人工林衰退与铝毒害阈值的探讨

罗承德 张健 刘继龙   

  1. 四川农业大学,雅安625014
  • 收稿日期:1998-09-10 修回日期:1900-01-01 出版日期:2000-01-25 发布日期:2000-01-25

RESEARCHES ON THE THRESHOLD OF ALUMINUM TOXICITY AND THE DECLINE OF CHINESE FIR PLANTATION IN HILLY AREA AROUND THE SICHUAN BASIN

Luo Chengde,Zhang Jian,Liu Jilong   

  1. College of Forestry and Holticulture, Sichuan Agricultural University Ya'an625014
  • Received:1998-09-10 Revised:1900-01-01 Online:2000-01-25 Published:2000-01-25

摘要:

根据四川盆周山地杉木人工林调查分析数据,借鉴国内外森林土壤酸化研究方法,在立地分类基础上,确定二代杉木人工纯林作为研究对象,选择根际土壤pH 值(KCl) 、Al3+、Ca2+ /Al3+和凋落物Ca2+/(Ca2+ +Fe3++ Al3+) 作为参数,探讨杉木人工林衰退与铝毒害阈值。研究结果表明,有的林地立地质量差,树种与立地不相适应,导致杉木人工林生产力下降;另有的林地,虽然立地条件较好,但是已出现铝毒害,导致杉木人工林衰退。铝毒害阈值是pH≤4.18 ,Al3 +≥31.66 mg/kg,Ca2+ /Al3+ ≤1.809 mol/mol 和Ca2+/(Ca2+ + Fe3++Al3+)≤0.55 mol/mol。

关键词: 立地类型, 铝毒害阈值, 杉木人工林, 缓冲容量

Abstract:

Using the experiences of researching on forest soil acidification both at home and abroad, collecting the data from hilly area around the sichuan basin, the pure Chinese fir(Cunninghamia lanceolata Lamb. Hook)second generation plantation was studied basing on the site classification. The rhizosphere soil pH(KCl), Al3+,Ca2+/Al3+, litter Ca2+/(Ca2++Fe3++Al3+)were selected as reference factors to study the cause of growth decline of Chinese fir plantation and the thresholds of aluminum toxicity. The results showed that the causes of decline of Chinese fir plantation were: (1)The tree species was not suitable to the bad site conditions; (2)Aluminum toxicity occurred in the stands with good or better site conditions. The thresholds were: pH≤4.18, Al3+≥31.66mg/kg, Ca2+/Al3+≤1.809mol/mol and Ca2+/(Ca2++Fe3++Al3+)≤0.55mol/mol.

Key words: Site type, Thresholds of aluminum toxicity, chinese fir plantaion, Buffer capacity