巴郎山高山及亚高山草甸花卉植物生物量海拔梯度格局

Altitudinal patterns of flower plant biomass on alpine and subalpine meadow in Balang Mountains.

采用野外调查方法,研究卧龙巴郎山高山及亚高山草甸不同海拔梯度下花卉植物生物量的变化格局,并进行土壤因子分析.结果表明:花卉植物地上生物量随海拔的升高呈单峰曲线变化,在3500m处达到峰值,花-果、茎、叶生物量的变化趋势与地上生物量一致;地下生物量随海拔的升高呈U型曲线变化.随海拔的升高,土壤酸性增强,水解氮和全钾含量显著升高,土壤有机质、全氮和有效磷的含量显著降低.花卉植物地上生物量随土壤pH值及全氮、速效钾含量的升高显著增大;地下生物量随土壤有机质、有效磷含量的升高显著增大,随全钾、水解氮含量的升高显著减小.

A field survey was conducted to study the altitudinal patterns of flower plant biomass on alpine and subalpine meadow in Wolong Nature Reserve in Balang Mountains,and the soil factors were analyzed.With the increase of altitude,the aboveground biomass,including the biomass of flower-fruit,stem,and leaf,varied in unimodal and peaked at 3500 m a.s.l.,the belowground biomass varied in U-shape,the soil acidity and the contents of soil hydrolyzable N and total K increased significantly,whereas the contents of soil organic matter,total N,and available P had a significant decrease.The aboveground biomass of the flower plants increased significantly with increasing soil pH and soil total N and available K contents,and the belowground biomass of the plants increased significantly with increasing soil organic matter and available P contents but decreased significantly with increasing soil total K and hydrolyzable N contents.