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不同密度退耕雷竹春季林冠截留特性

曾伟,熊彩云,肖复明**,余林,熊振宇   

  1. (江西省林业科学院, 南昌 330032)
  • 出版日期:2014-05-10 发布日期:2014-05-10

Spring canopy interception characteristics of Phyllostachys praecox cv. Prevernalis stand converted from cropland at different densities.

ZENG Wei, XIONG Cai-yun, XIAO Fu-ming**, YU Lin, XIONG Zhen-yu   

  1. (Jiangxi Academy of Forestry, Nanchang 330032, China)
  • Online:2014-05-10 Published:2014-05-10

摘要:

为研究不同密度退耕雷竹春季林冠截留特性,对8个不同林分密度(10800±400、11600±400、13200±400、14800±400、16400±400、20800±400、22400±400和22800±400株·h-2)的退耕雷竹林进行水文观测。结果表明:不同林分密度雷竹林外降雨与穿透雨、竹秆径流均具有极显著的抛物线函数关系,与林冠截留具有开口向下的抛物线函数关系;8个林分平均林冠截留率变化范围为1.42%~37.58%,林分密度与其最大截留量、平均林冠截留率呈开口向下的抛物线函数关系;当雷竹林分密度为17209株·hm-2时,其平均林冠截留率达到最大31.15%,最大林冠截留潜力为39.07 mm;可见,合理的林分密度可充分发挥退耕雷竹林的生态水文效益。
 

关键词: 相关分析, 通径分析, Na2CO3胁迫, 土壤微生物, 甜菜, 土壤酶

Abstract:

A hydrological observation in Phyllostachys praecox cv. Prevernalis stands converted from croplands at eight different densities (10800±400, 11600±400, 13200±400, 14800±400, 16400±400, 20800±400, 22400±400, 22800±400 individuals per hm-2) was carried out to study their canopy interception characteristics. The results showed that the rainfall had a parabolic relationship with throughfall and stemflow, and had a downward parabolic relationship with canopy interception, respectively. The average rate of canopy interception of the eight stands ranged from 1.42% to 37.58%, and the stand density had a downward parabolic relationship with the maximum canopy interception and average canopy interception rate. At the stand density of 17209 individuals per hm-2, the average canopy interception rate was maximum (31.15%) and the maximum canopy interception potential was 39.07 mm. Therefore, a proper stand density could fully favor the ecohydrological benefit of P. praecox cv. Prevernalis stands.
 

Key words: path coefficient analysis, soil enzyme, correlation analysis, Na2CO3 stress, sugarbeet, soil microbe