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目的:为探讨草麻黄Ephedra sinica Stapf对土壤酶活性及活性有机碳的影响及其机理,揭示其对土壤养分利用的机制,为其人工栽培技术提供理论支撑。方法:选择河北省旱作区不同密度野生草麻黄地土壤,对比玉米田和空地土壤,研究草麻黄对土壤酶活性与活性有机碳含量的影响。结果:草麻黄地土壤过氧化氢酶活性显著低于空地高于玉米地,脲酶活性和蔗糖酶活性显著高于空地。随着草麻黄密度和生物量的增加,土壤过氧化氢酶活性和脲酶活性呈下降趋势,蔗糖酶活性呈先升后降趋势。草麻黄地土壤总有机碳(TOC)含量显著高于空地,活性有机碳(AOC)含量低于空地。随着草麻黄密度和生物量的增加TOC含量呈先升后降趋势,AOC含量呈先降后升趋势。土壤pH值与过氧化氢酶呈极显著正相关,与脲酶呈显著负相关,与AOC呈极显著正相关,与AOC/TOC呈显著正相关,蔗糖酶活性与TOC呈显著正相关,与AOC/TOC呈显著负相关。结论:草麻黄通过根系分泌物及残体脱落影响土壤TOC组分变化、pH值及酶活性,促进土壤养分循环,以适应贫瘠的环境条件。草麻黄高产栽培适应于养分转化较快的沙壤土。
OBJECTIVE: To investigate the effect and mechanism of Ephedra sinica Stapf on soil enzyme activity and active organic carbon, and to reveal its mechanism of soil nutrient utilization, and to provide theoretical support for its artificial cultivation techniques. Methods: Different concentrations of wild grassland soil in Hebei arid area were selected to compare the effects of the grassland on the activity of soil organic carbon and the content of active organic carbon in maize field and open soil. Results: The activity of catalase in the soil of Hedysarum scopulaeformis was significantly lower than that in the corn land, and the urease activity and sucrase activity were significantly higher than those in the open field. With the increase of density and biomass of the plant, the activities of catalase and urease decreased, and the activities of invertase increased first and then decreased. The content of total organic carbon (TOC) in the grassland was higher than that in the open land, and the content of the active organic carbon (AOC) was lower than that in the open land. With the increase of Tightness and biomass of Triticum aestivum, TOC content first increased and then decreased, AOC content decreased first and then increased. There was a significant positive correlation between soil pH value and catalase, a significant negative correlation with urease, a significant positive correlation with AOC, a significant positive correlation with AOC / TOC, a significant positive correlation between invertase activity and TOC, / TOC was significantly negative correlation. CONCLUSION: Ephedra sinica can affect the change of soil TOC components, pH value and enzyme activity through the exudation of root exudates and debris, and promote soil nutrient cycling to adapt to the barren environmental conditions. Ephedra high yielding cultivation adapted to nutrient-fast sandy loam soil.