艾比湖湿地自然保护区4种典型群落间土壤酶活性的变化

发布时间：2019-01-14 12:19

【摘要】：酶是土壤生态系统代谢的一类重要动力,研究其在土壤垂直层间和群落间的变化,能够为理解土壤生态系统中物质循环和能量转换提供依据。本文以艾比湖湿地自然保护区内分布最广泛的胡杨、梭梭、柽柳和盐节木4种典型荒漠群落为研究对象,通过分析过氧化氢酶、脲酶、磷酸酶和蔗糖酶的活性、群落数量特征和土壤理化性质在不同群落间的变化,试图阐明群落数量特征和土壤理化因子对土壤酶活性变化的影响。结果表明:(1)4种典型群落内,土壤酶活性在0~15 cm、15~30 cm和30~50 cm的土层间均无显著性差异(P0.05);(2)4种典型群落间,同土壤深度的过氧化氢酶和磷酸酶的活性均无显著性差异(P0.05);相反,同土壤深度的脲酶和蔗糖酶的活性存在显著性差异(P0.05);(3)将群落数量特征和土壤理化因子对土壤酶活性逐步回归后发现,除过氧化氢酶活性受群落数量特征影响外,脲酶、蔗糖酶、磷酸酶的活性变化均与群落数量特征无关。表明干旱荒漠内,群落数量特征和土壤理化因子都能对土壤酶活性的变化产生影响,但具体起影响作用的因子与土壤酶类型有关。
[Abstract]:Enzyme is a kind of important power of soil ecosystem metabolism. Studying its change in soil vertical layer and community can provide basis for understanding material cycle and energy conversion in soil ecosystem. In this paper, four typical desert communities of Populus euphratica, Haloxylon ammodendron, Tamarix and Artemisia Salina were studied in the Ebinur Wetland Nature Reserve. The activities of catalase, urease, phosphatase and sucrase were analyzed. The changes of community quantitative characteristics and soil physical and chemical properties among different communities were studied in order to clarify the effects of community quantitative characteristics and soil physical and chemical factors on the changes of soil enzyme activities. The results showed that: (1) there was no significant difference in soil enzyme activity between 0 ~ 15 cm,15~30 cm and 30 ~ 50 cm soil layer in four typical communities (P0.05); (2) there was no significant difference in the activities of catalase and phosphatase with soil depth among the four typical communities (P0.05), but there was significant difference in urease and sucrase activity with soil depth (P0.05). (3) the quantitative characteristics of community and soil physical and chemical factors on soil enzyme activity were gradually regressed. It was found that the changes of urease, sucrase and phosphatase activities were not related to the community quantitative characteristics except catalase activity affected by the community quantitative characteristics. The results showed that the quantitative characteristics of communities and soil physical and chemical factors could affect the changes of soil enzyme activity in arid desert, but the specific factors were related to the types of soil enzymes.
【作者单位】：绿洲生态教育部重点实验室;新疆大学资源与环境科学学院;智慧城市与环境建模自治区普通高校重点实验室;新疆大学干旱生态环境研究所;
【基金】：国家自然基金项目(31500343) 新疆维吾尔自治区自然科学基金项目(2017D01C080) 新疆青年人才培养工程项目(qn2015bs006)资助
【分类号】：S714.3

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