高速公路岩石边坡3类人工植物群落凋落物分解特征

Analysis of litter decomposition characteristics in three types of artificial vegetation community on expressway rock slope

以某高速公路岩石边坡建植的3年期人工植物群落为研究对象,采用分解袋法研究了3类人工植物群落(木本植物群落、混合植物群落、草本植物群落)凋落物分解特征。结果表明:第1年和第3年凋落物累积量为木本植物群落>混合植物群落>草本植物群落,第2年为混合植物群落>木本植物群落>草本植物群落,凋落物年积累量118.12~162.49 g/m^2;经过510 d分解期,3类人工植物群落凋落物分解速率差异显著,分别损失初始重量的43.18%,38.66%和34.77%;分解过程中C/N,N/P与凋落物分解速率呈负相关,C/P与凋落物分解速率呈正相关;木本植物群落凋落物各养分含量均呈上升趋势,混合植物群落全N含量上升,草本植物群落有机碳含量上升,凋落物分解特征因边坡人工植物群落恢复类型不同而差异显著。

Decomposition characteristics of litter in three types of artificial vegetation community(woody vegetation community,woody+herbaceous mixed vegetation community and herbaceous vegetation community)were studied by using decomposition bag method,based on the three years artificial vegetation community of an expressway rock slope.The results showed that annual accumulation of litter ranges from 118.12 to 162.49 g/m^2,woody vegetation community>woody+herbaceous mixed vegetation community>herbaceous vegetation community at 1th year and 3rd year,woody+herbaceous mixed vegetation community>woody vegetation community>herbaceous vegetation community at 2nd year.After the 510 d decomposition period,the decomposition rates of litter in three kinds of artificial vegetation were significantly different,respectively losing 43.18%,38.66%and 34.77%of the initial weight.In the decomposition process,C/N and N/P were negatively correlated with the decomposition rate of litter,while C/P was positively correlated with the decomposition rate of litter.All nutrient contents of litter in woody vegetation community showed an increasing trend,the total N content of mixed vegetation community increased,and the organic carbon content of herbaceous vegetation community increased.The decomposition characteristics of litter were significantly different with different types of artificial vegetation community restoration.