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• 研究报告 • 上一篇    下一篇

柏木低效林不同改造模式下细根分布特征

范川,李贤伟**,张健,李平,刘滔   

  1. (四川农业大学林学院, 长江上游林业生态工程四川省重点实验室, 四川雅安 625014)
  • 出版日期:2014-07-10 发布日期:2014-07-10

Fine root distribution characteristics of lowefficiency Cuprssus funebris stands with different transformation modes.

FAN Chuan, LI Xian-wei**, ZHANG Jian, LI Ping, LIU Tao   

  1. (Sichuan Provincial Key Laboratory of Ecological Forestry Engineering, Sichuan Agricultural University Ya’an 625014, Sichuan, China)
  • Online:2014-07-10 Published:2014-07-10

摘要:

以四川省德阳市旌阳区低效柏木林改造8年后的3种模式(即:柏木+桤木+杂交竹模式(柏+竹+桤)、柏木+麻栎模式(柏+栎)、柏木+杂交竹模式(柏+竹))作为研究对象,柏木纯林作为对照,调查了柏木低效林不同改造模式的细根生物量。结果表明:不同改造模式与土层对细根生物量的影响非常显著(P<0.01),柏+竹与柏+竹+桤模式细根生物量显著高于纯柏模式,柏+栎模式细根生物量最小。在不同改造模式中,柏木细根生物量在土壤层次上的分布也存在显著差异,柏+竹与柏+竹+桤模式中柏木细根生物量随着土层的加深呈上升趋势,而柏+栎模式中则随着土层的加深呈下降趋势,柏+栎模式中柏木死细根的比重明显高于其他模式。几种模式中,柏+竹+桤模式细根生物量分布相对稳定,而柏+栎模式的稳定性较差。
 

关键词: 滨海湿地, 硫酸盐, C1化合物歧化, 非竞争性底物, 兼性营养型产甲烷菌

Abstract:

Three transformation modes were used to improve the lowefficiency Cupressus funebris stands in Jingyang of Deyang City, Sichuan Province in 2002. The three transformation modes included C. funebris+Alnus cremastogyne+Bambusa pervariabilis×Dendrocalamopsis daii mode (BZQ), C. funebris+Quercus acutissima mode (BL), and C. funebris+B. pervariabilis×D. daii mode (BZ). After eight years of transformation, we investigated the fine root biomass of differently transformed Cuprssus funebris stands in the soil profiles. The results showed that the transformation modes and soil layer affected the fine root biomass significantly (P<0.01). Fine root biomass of BZ and BZQ were significantly higher than that of CB, while the fine root biomass of BL was the lowest. The fine root biomass of C. funebris distributed differently among the different transformation modes, increasing with the increase of soil depth in BZ and BZQ, while decreasing in BL. The proportion of C. funebris dead fine roots in BL was significantly higher than that in the other transformation modes. The distribution of fine root biomass was relatively stable in BZQ, while was poorly stable in BL.
 

Key words: coastal wetlands, facultative methanogens, disproportionation of C1 methy-lated compounds, non-competitive substrates, sulfate