摘要
对甘南地区云杉人工林和天然林的不同林龄(包括幼龄林、中龄林、近熟林和成熟林)土壤有机碳密度及其群落物种多样性的关系进行研究。结果表明:不同起源云杉林在各林龄中均以表层土壤(0—10cm)土壤有机碳含量最高,随土壤深度的增加逐渐减少;土壤有机碳密度除天然云杉成熟林在表层最高外,其他均以深层土壤(50—100cm)最高,且土壤有机碳含量和有机碳密度随林龄的变化不显著(p>0.05)。冗余分析表明,人工林0—10,10—20,20—30,30—50cm的土壤有机碳密度除与Ea指数呈负相关关系外,与丰富度(S)、Shannon-Wiener指数(H′)、Simpson指数(D)、Pielou指数(Jsw)均呈正相关关系;天然林0—10,10—20,20—30cm的土壤有机碳密度与这5个指数均呈正相关关系。
Different-aged forests (including young forest, middle-aged forest, pre-mature forest and mature forest) of both plantations and natural forests of spruce (Picea asperata) were systematically investigated in Gannan Tibetan Autonomous Prefecture to explore the relationship between species diversity and soil organic carbon (SOC) density. Vertical distribution of SOC content and density, and species diversity, in both plantations and natural forests were analyzed. The results showed that SOC contents were highest in the top soil in different-aged forests of both natural forests and plantations, and decreased gradually with soil depth. SOC densities were highest in the deep soil layer(50-100 cm)in different-aged forests of both natural forests and plantations except the natural mature forest. Moreover, SOC content and density varied insignificantly with forest ages(p〉0.05). SOC density in spruce plantations increased, whereas SOC density in spruce natural forests decreased along the ages. Redundancy discriminate analysis (RDA) showed that SOC densities of 0 10, 10-20, 20-30, 30-50 cm in spruce plantations had a positive relationship with species richness (S), Shannon-Wiener (Hr) , Simpson (D) and Pielou (Jsw), but a negative relationship with Alatalo (Ea). By contrast, SOC densities of 0-10, 10-20 and 20 30 cm in spruce natural forests had a positive relationship with the five indices mentioned above.
出处
《水土保持研究》
CSCD
北大核心
2016年第2期49-54,59,共7页
Research of Soil and Water Conservation
基金
中国科学院战略性先导科技专项(XDA05050202)
国家自然科学基金(41171419
41411140035)
关键词
云杉
人工林
天然林
林龄
土壤有机碳密度
物种多样性
Picea asperata
planations
natural forests
forest age
soil organic carbon density
species diversity