臭柏群落演替过程中土壤环境的变化

在臭柏群落演替过程中土壤含水量总的趋势为先上升后下降。在进展演替阶段呈上升趋势,逆行演替阶段逐渐下降。0~5 cm表层土壤的含水量变化不明显,上层5~30 cm的土壤含水量有明显的先上升后下降的趋势,而深层的土壤含水量变化不大。从土壤剖面来讲,随着土层的加深土壤含水量在逐渐的下降。随着进展演替土壤颗粒组成发生变化,砂粒含量趋于减少、粉粒和粘粒增多、有机质含量逐渐增加、C/N下降,逆行演替阶段与其相反;臭柏群落的演替对有机质积累的影响主要集中在土壤表层0~50cm土层内;物种丰富度、盖度与土壤粘粒、C、N、K、P呈正相关。由此可见,臭柏群落进展演替的系统内容与基质的改造和土壤发育密切联系,它们之间彼此影响,相互配合。

Changes of Soil Environment with Sabina vulgaris Community at the Different Successional Stages

With the succession of Sabina vulgaris community,the general trend of soil moisture increased firstly after declining.Progressive succession stages of an upward trend,regressive succession stages gradually declining.Soil moisture content did not change significantly in 0-5 cm of soil surface,and the trend of it in 5-30 cm of soil was significantly,which was increase at first then decrease,but the deep soil moisture did not change.From the soil profile speaking,soil moisture was in the gradually decline with the deepening of soil.The soil particles had changed with the progressive succession,sand content tends to reduce,silt and clay increased,organic matter content gradually increased,C / N declined,in contrast to its regressive succession stage;The contribution of the succession of Sabina vulgaris community to the accumulation of organic matter mainly concentrated in the soil surface from 0 to 50 cm;Species richness,coverage and soil clay,C,N,K,P had positive correlation.In a word,the reconstitution of progressive succession of Sabina vulgaris community system content and soil matrix was contact with soil transformation close,their impacted on each other and coordinated with each other.