论文部分内容阅读
为了研究退耕地植被恢复中物种多样性与生物学特征存在一定的关系,以石羊河下游民勤绿洲内退耕地为研究对象,对其物种多样性与土壤酶活性及其相关性进行分析。结果表明:(1)随着退耕地的恢复,物种的Margalef指数、Simpson指数、Shanon-wiener指数呈下降趋势,群落优势度呈先增加后减少趋势,Pielou指数、Alatalo指数呈波动式增加趋势。(2)受退耕地盐碱化影响,土壤中过氧化氢酶的含量明显高于磷酸酶、脲酶和蔗糖酶;磷酸酶、过氧化氢酶、蔗糖酶的含量随着退耕地植被的恢复呈波动式增加。而脲酶呈递减趋势,可能是因植被随退耕年限的增加使得物种趋于单一,为其提供的物质源随之减少。(3)民勤退耕地土壤酶活性与植物物种多样性存在不同程度的相关性,脲酶与各指数之间的相关性最为显著,磷酸酶次之,过氧化氢酶、蔗糖酶与各指数之间的相关性较弱。
In order to study the relationship between species diversity and biological characteristics in the process of vegetation restoration, the species diversity, soil enzyme activity and their correlation in the Minqin oasis in the lower Shiyang River were studied. The results showed that: (1) Margalef, Simpson and Shanon-wiener indices of species decreased with the restoration of cultivated land. Community dominance increased firstly and then decreased; Pielou index and Alatalo index increased in a fluctuating manner. (2) The content of catalase in soil was significantly higher than that of phosphatase, urease and invertase due to the salinization of the cultivated land. The content of phosphatase, catalase and invertase increased with the recovery of vegetation Volatility increased. The declining tendency of urease may be due to the fact that the vegetation tends to be single due to the increase of vegetation degeneration period, and the material sources for it will decrease accordingly. (3) There was a correlation between soil enzyme activities and plant species diversity in Minqin County. The correlation between urease and each index was the most significant. Phosphatase followed by catalase, sucrase and each index The correlation between the weaker.