欢迎访问《应用生态学报》官方网站,今天是 分享到:

应用生态学报

• 研究报告 • 上一篇    下一篇

退化红壤重建森林初期细根特征及其作用机理研究

刘苑秋1 罗良兴2 刘亮英1 杨家林3 夏晓兰1   

  1. 1江西农业大学林学院,南昌 330045;2江西省泰和县林业局,泰和343700;3南昌市林业局,南昌 330000
  • 收稿日期:2004-08-17 修回日期:2005-03-07 出版日期:2005-09-18

Fine-root character and its action mechanism of forest at its initial reestablished stage on degraded red soil

LIU Yuanqiu,LUO Liangxing,LIU Liangying,YANG Jialin,XIA Xiaolan   

  1. Forestry College of Jiangxi Agricultural University,Nanchang 330045,China
  • Received:2004-08-17 Revised:2005-03-07 Online:2005-09-18

摘要: 以江西泰和严重退化红壤上不同模式重建的森林第10年森林生态系统为对象,分析了细根分布特征及其与土壤性状相关性.结果表明,各重建森林模式的土壤细根主要分布在0~20 cm土层,占0~40 cm土层的73.39%~87.41%;不同重建森林模式细根的养分贮量有较明显差异,中等栽植密度晚松纯林细根的全N、全P和全K贮量远远高于其它林地,细根中全N、全P、全K、Ca、Mg贮量分别达84.47、5.55、38.42、17和10.76 kg·hm-2;土壤有机质、全N、有效N、有效K、pH值与细根现存量相关显著(P<0.05),细根对物理性状的影响主要体现在毛管孔隙度和总孔隙度上;植物细根显著提高了>5 mm土壤水稳性团聚体及>0.25 mm水稳性团聚体含量,从而增加了土壤结构的稳定性;土壤细根与土壤细菌和微生物总数相关性显著.

关键词: 小叶锦鸡儿, 土壤水分, 科尔沁沙地

Abstract: This paper studied the fine-root character and its action mechanism of forest reestablished by different models for 10 years on a seriously degraded red soil,and analyzed their correlation with soil property.The results showed that fine-roots mostly distributed in 0~20 cm soil layer,accounted for 73.39%~87.41% of those in 0~40 cm soil layer.There were notable differences in nutrient storage of fine-roots under different reestablishment models.The fine-roots of medium density pure Pinus serotina forest had a much higher storage of total nitrogen,phosphorus and potassium,with the content of total nitrogen,phosphorus,potassium,calcium and magnesium being 84.47,5.55, 38.42,17.00 and 10.76 kg·hm-2,respectively.Soil organic matter,total nitrogen,available nitrogen,available potassium and pH had significant correlations with fine-root biomass (P<0.05).The effects of fine-roots on soil physical properties mainly reflected on soil capillary porosity and total porosity.Fine-roots obviously increased the contents of >0.25 mm and >5 mm soil waterstable aggregates,and improved soil structure-stability.The correlations between fine-roots and soil bacteria and microbial quantities were significant.

Key words: Caragana microphylla, Soil moisture, Kerqin sandland