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林业资源管理 ›› 2011›› Issue (1): 62-66.

• 科学技术 • 上一篇    下一篇

不同密度华北落叶松人工林土壤理化性质研究

孙嘉, 王海燕, 丁国栋, 于洋, 任丽娜, 梁文俊   

  1. 北京林业大学水土保持学院 教育部水土保持与荒漠化防治重点实验室,北京 100083
  • 收稿日期:2010-11-20 修回日期:2010-12-15 出版日期:2011-02-28 发布日期:2020-12-16
  • 通讯作者: 王海燕,haiyanwang72@yahoo.com.cn
  • 作者简介:孙嘉(1986-),男,安徽人,硕士研究生,主要从事土壤及植物营养研究。Email:sjjasoneee@126.com
  • 基金资助:
    林业公益性行业科技专项(200804022A)

Soil Physico-chemical Properties under Larix principis-rupprechtiiPlantations of Different Stand Densities

SUN Jia, WANG Haiyan, DING Guodong, YU Yang, REN Lina, LIANG Wenjun   

  1. Key Lab of Soil and Water Conservation and Desertification Combating,Ministry of Education,School of Soil and Water Conservation,Beijing Forestry University,Beijing,100083,China
  • Received:2010-11-20 Revised:2010-12-15 Online:2011-02-28 Published:2020-12-16

摘要: 以河北省木兰围场国有林场管理局北沟林场内5种不同密度的华北落叶松人工林为对象,研究林分密度对土壤理化性质的影响,结果发现:林分密度不同程度地影响土壤理化性质。当株数密度为660株/hm2时,土壤的质量含水量、全N及全K含量均保持在一个相对较高的水平;当株数密度从740株/hm2增加到2000株/hm2时,0~20cm土层的土壤密度先减小后增大,而土壤质量含水量、土壤有机质和全N含量表现出相反的趋势;20~60cm土层的土壤密度与0~20cm土层的变化情况相同,而土壤质量含水量和土壤速效K含量则持续降低,土壤有效P含量呈现出增大趋势;当株数密度达到2000株/hm2以上时,林地土壤的pH值降低,呈现明显的酸化趋势。过大的林分密度可能导致华北落叶松人工林地土壤酸化与土壤水分、有机质、N和K元素的加速消耗。从维持林地土壤健康的角度,建议将华北落叶松人工林地的林分密度控制在1500株/hm2左右并且不能超过2000株/hm2

关键词: 华北落叶松, 土壤理化性质, 林分密度, 土壤健康

Abstract: Soil physico-chemical properties under Larix principis-rupprechtii plantations of different stand densities were studied in Beigou Forest Farm,Mulanweichang,Hebei Province.The results showed that stand density affected soil physico-chemical properties to varied degrees.At the stand density of 660 trees/hm2,soil water content,total N and total K content were maintained at relatively high levels;when the stand density increased from 740 trees/hm2 to 2000 trees/hm2,soil bulk density decreased first and then increased,but soil water content,total N and organic matter content showed the opposite trend in the soil depth of 0~20 cm;In the soil depth of 20~60 cm,soil bulk density showed the same pattern as that in the soil depth of 0~20 cm,soil water content and soil rapidly available K content kept decreasing,but soil available P content increased with increasing soil depth.With the stand density of higher than 2000 trees/hm2,soil pH declined and showed a significant trend of acidification.Therefore,the stand density of Larix principis-rupprechtii plantations was suggested to be about 1500 trees/hm2 and no more than 2000 trees/hm2 to avoid soil acidification and to keep soil healthy.

Key words: Larix principis-rupprechtii, soil physico-chemical property, stand density, soil health

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