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应用生态学报 ›› 2010, Vol. 21 ›› Issue (11): 2763-2768.

• 研究报告 • 上一篇    下一篇

青杨人工林根系生物量、表面积和根长密度变化

燕 辉1,刘广全1,2,3**,李红生1   

  1. 1西北农林科技大学,陕西杨凌 712100;2国际泥沙研究培训中心,北京 100048;3中国水利水电科学研究院,北京 100048
  • 出版日期:2010-11-18 发布日期:2010-11-18

Changes of root biomass, root surface area, and root length density in a Populus cathayana plantation.

YAN Hui1, LIU Guang-quan1,2,3, LI Hong-sheng1   

  1. 1Northwest A &F University, Yangling 712100, Shaanxi, China|2International Research and Training Center on Erosion and Sedimentation, Beijing 100044, China|3China Institute of Water Resources and Hydropower Research, Beijing 100044, China
  • Online:2010-11-18 Published:2010-11-18

摘要: 在植物生长季节,采用钻取土芯法对秦岭北坡50年生青杨人工林根径≤2 mm和2~5 mm根系的生物量、表面积和根长密度进行测定.结果表明:在青杨人工林根系(<5 mm)中,根径≤2 mm根系占总生物量的77.8%,2~5 mm根系仅占22.2%;根径≤2 mm根系表面积和根长密度占根系总量的97%以上,而根径2~5 mm根系不足3%.随着土层的加深,根径≤2 mm根系生物量、表面积和根长密度数量减少,根径2~5 mm根系生物量、表面积和根长密度最小值均分布在20~30 cm土层.≤2 mm根系生物量、表面积和根长密度与土壤有机质、有效氮呈极显著相关,而根径2~5 mm根系的相关性不显著.

关键词: 青杨人工林, 根系生物量, 根表面积, 根长密度

Abstract: By using soil core method, the biomass, surface area, and length density of roots ≤2 mm and 2-5 mm in diameter in a 50-year-old Populus cathayana plantation on the northern slope of Qinling Mountains were determined during growth season. Among the roots <5 mm in diameter, those ≤2 mm and 2-5 mm in diameter accounted for 77.8% and 22.2% of the total root biomass, respectively. The surface area and length density of the roots ≤2 mm in diameter accounted for more than 97% of the total, and those of the roots 2-5 mm in diameter only occupied less than 3%. The biomass, surface area, and root length density of roots ≤2 mm in diameter decreased with soil depth, while those of the roots 2-5 mm in diameter were the least in 20-30 cm soil layer. The biomass, surface area, and length density of roots ≤ 2 mm in diameter were significantly correlated with soil organic matter and available nitrogen, but no significant correlations were found for the roots 2-5 mm in diameter.

Key words: Populus cathayana plantation, root biomass, root surface area, root length density