生态环境学报2018，Vol.27Issue(4)：609-616,8.DOI:10.16258/j.cnki.1674-5906.2018.04.003
冰雪灾害后的杉木人工林冠层结构与林下光照及土壤生化特性的关系
Relationships between Canopy Structure and Understory Light and Soil Biochemical Property in A Cunninghamia lanceolata Stand Suffering from Ice-snow Damage
摘要
Abstract
A huge ice storm stroke on the north of Guangdong Province from January to February 2008, which resulted in damaged Cunninghamia lanceolata stands in a large scale.Relationship between canopy structure and understory light and soil biochemical properties were analyzed in a C.lanceolata stand suffering from ice-snow damage so as to provide a scientific basis for restoration of the damaged stands. Field investigations, hemispherical imaging techniques and dilution plate methods were used to study the relationships between canopy structure and understory light, undergrowth soil microbial diversity and enzyme activity in different gaps in the C. lanceolata stands during restoration. The results showed that with the increasing gap size area, canopy openness increased from 10.93% to 18.36%, leaf area index decreased from 2.70 to 1.88, direct light increased from 3.21 to 9.29 mol·m-2·d-1, scattering light increased from 3.02 to 5.41 mol·m-2·d-1, total light increased from 6.23 to 14.70 mol·m-2·d-1. Canopy openness had an extremely significant negative correlation with leaf area index and extremely significant positive correlations with the range of forest gap, direct light, scattering light and total light. The leaf area index had significant negative correlations with direct light, scattering light and total light. The number of bacterial, fungi and actinomycetes of the quadrats ranged from 0.67×106 to 8.07×106 CFU·g-1, from 2.83×105 to 16.33×105 CFU·g-1and from 6.07×105 to 48.33×105 CFU·g-1, respectively. The activities of urease, phosphatase and catalase ranged from 0.34 to 1.88 mg·kg-1, from 196.20 to 418.03 mg·kg-1and from 1.00 to 2.00 mg·L-1, respectively. Polynomial correlations existed between canopy openness and phosphatase activity as well as between canopy openness and catalase activity. In summary, the canopy structure is closely related to understory light and soil enzyme activity. Within a certain range, a large canopy opening is conducive to the improvement of understory light conditions and soil enzyme activity in the damaged C.lanceolata stand. When the canopy opening exceeds a certain range, the soil enzyme activity decreases. Therefore the canopy structure determines the light distribution and soil quality in forest stands.关键词
冰雪灾害/林冠开度/林下光照/土壤微生物/土壤酶Key words
ice-snow damage/canopy open/understory light/soil microorganism/soil enzyme分类
农业科技引用本文复制引用
方怡然,潘澜,薛立..冰雪灾害后的杉木人工林冠层结构与林下光照及土壤生化特性的关系[J].生态环境学报,2018,27(4):609-616,8.基金项目
中央财政林业科技推广示范项目(2015-GDTK-07) （2015-GDTK-07）
