地形、树种和土壤属性对喀斯特山区土壤胞外酶活性的影响
发布时间：2018-11-21 11:59
【摘要】：土壤胞外酶在生态系统生物地球化学循环过程中扮演着重要角色,然而关于土壤胞外酶活性的主控因子研究还不够深入,特别是在偏碱性的钙质土壤区域相关研究尤其缺乏.本研究以典型喀斯特山区(木论国家级自然保护区)的林地为研究对象,采集不同地形条件(不同坡位和坡向)、不同树种(厚壳桂和伞花木)下的表层土壤(0~15 cm),测定了与碳、氮、磷循环相关的6种水解酶的活性及相关土壤理化性质.研究运用方差分解,并结合多响应置换过程以及冗余分析技术分析了地形、树种和土壤理化性质对土壤酶活性的影响.结果表明,坡位对土壤酶活性有显著影响.树种和坡向对土壤酶活性的影响不显著.方差分解结果表明,地形、树种和土壤理化性质共同解释了土壤酶活性变化的55.3%,其中土壤因子是影响酶活性改变的主要因子,解释了44.2%的变异.而冗余分析的结果进一步表明在土壤因子中,pH、总氮和无机氮是影响土壤酶活性变化的主要指标.研究首次量化了喀斯特地区小尺度内地形、树种及土壤理化性质对土壤酶活性变化的影响.研究也说明了在喀斯特山区小尺度内土壤酶活性的变化可由土壤理化性质来表征.
[Abstract]:Soil extracellular enzymes play an important role in the biogeochemical cycle of ecosystem. However, the study on the main factors of soil extracellular enzyme activity is not deep enough, especially in alkaline calcareous soil areas. In this study, the forestland of typical karst mountain area (Muxuan National Nature Reserve) was used as the research object, and the topsoil (015 cm),) was collected under different topographic conditions (different slope position and slope direction) and different tree species (Cassia crassifolia and Umbrella). The activities of six hydrolases related to carbon, nitrogen and phosphorus cycling and the soil physicochemical properties were determined. The effects of topography, tree species and soil physical and chemical properties on soil enzyme activity were analyzed by variance decomposition, multi-response displacement process and redundancy analysis. The results showed that the slope position had a significant effect on soil enzyme activity. The effects of tree species and slope direction on soil enzyme activity were not significant. The results of variance decomposition showed that topography, tree species and physical and chemical properties of soil explained the variation of soil enzyme activity by 55.3%, among which soil factor was the main factor affecting the change of enzyme activity, which accounted for 44.2% of the variation. The results of redundancy analysis further indicated that the total nitrogen of pH, and inorganic nitrogen were the main indexes affecting the change of soil enzyme activity. The effects of small scale topography, tree species and soil physical and chemical properties on soil enzyme activity in karst area were studied for the first time. The results also show that the change of soil enzyme activity in karst mountain area can be characterized by soil physical and chemical properties.
【作者单位】： 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室;中国科学院环江喀斯特生态系统观测站;中国科学院大学;
【基金】：国家重点研发计划项目(2016YFC0502404) 国家自然科学基金项目(31500405,41571295,31400462) 中国科学院百人计划项目(Y523101030);中国科学院STS项目(KFJ-EW-STS-092)
【分类号】：S714.3
，
本文编号：2346901
[Abstract]:Soil extracellular enzymes play an important role in the biogeochemical cycle of ecosystem. However, the study on the main factors of soil extracellular enzyme activity is not deep enough, especially in alkaline calcareous soil areas. In this study, the forestland of typical karst mountain area (Muxuan National Nature Reserve) was used as the research object, and the topsoil (015 cm),) was collected under different topographic conditions (different slope position and slope direction) and different tree species (Cassia crassifolia and Umbrella). The activities of six hydrolases related to carbon, nitrogen and phosphorus cycling and the soil physicochemical properties were determined. The effects of topography, tree species and soil physical and chemical properties on soil enzyme activity were analyzed by variance decomposition, multi-response displacement process and redundancy analysis. The results showed that the slope position had a significant effect on soil enzyme activity. The effects of tree species and slope direction on soil enzyme activity were not significant. The results of variance decomposition showed that topography, tree species and physical and chemical properties of soil explained the variation of soil enzyme activity by 55.3%, among which soil factor was the main factor affecting the change of enzyme activity, which accounted for 44.2% of the variation. The results of redundancy analysis further indicated that the total nitrogen of pH, and inorganic nitrogen were the main indexes affecting the change of soil enzyme activity. The effects of small scale topography, tree species and soil physical and chemical properties on soil enzyme activity in karst area were studied for the first time. The results also show that the change of soil enzyme activity in karst mountain area can be characterized by soil physical and chemical properties.
【作者单位】： 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室;中国科学院环江喀斯特生态系统观测站;中国科学院大学;
【基金】：国家重点研发计划项目(2016YFC0502404) 国家自然科学基金项目(31500405,41571295,31400462) 中国科学院百人计划项目(Y523101030);中国科学院STS项目(KFJ-EW-STS-092)
【分类号】：S714.3
，
本文编号：2346901
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