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张静,马玲,丁新华,陈旭日,马伟.扎龙湿地不同生境土壤微生物生物量碳氮的季节变化.生态学报,2014,34(13):3712~3719 本文二维码信息
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扎龙湿地不同生境土壤微生物生物量碳氮的季节变化
Seasonal dynamics of soil microbial biomass C and N in different habitats in Zhalong Wetland
投稿时间:2012-11-19  修订日期:2014-02-25
DOI: 10.5846/stxb201211191623
关键词土壤微生物生物量碳  土壤微生物生物量氮  季节变化  扎龙湿地
Key Wordssoil microbial biomass C  soil microbial biomass N  seasonal dynamics  Zhalong wetland
基金项目学术名师支持计划;国家自然科学基金项目(30870394)
作者单位E-mail
张静 黑龙江农业经济职业学院, 牡丹江 157041
东北林业大学, 哈尔滨 150040 
 
马玲 东北林业大学, 哈尔滨 150040 Maling63@163.com 
丁新华 东北林业大学, 哈尔滨 150040
新疆农垦科学院, 石河子 83200 
 
陈旭日 东北林业大学, 哈尔滨 150040  
马伟 黑龙江中医药大学, 哈尔滨 150040  
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摘要:
为从土壤微生物生物量角度分析扎龙湿地不同生境的土壤肥力状况,对扎龙芦苇生境和草甸生境不同土层(0-10 cm、10-20 cm、20-30 cm)微生物生物量碳(MBC)、氮(MBN)季节变化进行监测,并分析了土壤微生物生物量碳氮与土壤环境因子的关系。结果表明:两种生境土壤MBC、MBN含量均表现出明显的垂直分布特征,即0-10 cm > 10-20 cm > 20-30 cm,且草甸生境显著大于芦苇生境。在整个生长季节内,两种生境土壤微生物量碳、氮均大致呈现出“W”型变化格局,其变化幅度均随着土层的加深而减小,且草甸生境的变化幅度显著大于芦苇生境。相关分析表明:芦苇生境土壤MBC与土壤含水率呈极显著正相关(P < 0.01),与土壤pH呈极显著负相关(P < 0.01),MBN与土壤含水率、有机碳、水解性氮呈极显著正相关(P < 0.01),与土壤pH呈极显著负相关(P < 0.01);草甸生境土壤MBC则均与土壤含水率、有机碳、有效磷、水解性氮呈极显著正相关(P < 0.01),与土壤pH值呈显著正相关(P < 0.05),MBN则均与土壤含水率、有效磷呈极显著正相关(P < 0.01),与有机碳呈显著正相关(P < 0.05)。
Abstract:
Soil microbe activity is the most important decomposer in forest ecosystems and is a sensitive indicator of environmental changes. It plays a crucial role in wetland carbon and nitrogen cycles. However, few studies on soil microbial biomass carbon and nitrogen have been conducted in the Zhalong wetland, especially studies of the seasonal dynamics of soil microbial biomass carbon and nitrogen in different habitats. In this study, in order to investigate the soil fertility of different habitats based on the soil microbial biomass, the soil microbial biomass C and N were observed in three soil layers (0-10 cm, 10-20 cm, 20-30 cm) of a reed habitat and meadow habitat in the Zhalong wetland. Meanwhile, the relationships between the soil microbial biomass and soil environmental factors were also analyzed. The experimental design included two habitat types with three 20 m × 20 m plots in each habitat type. In each plot, we took random soil samples in three soil layers (0-10 cm, 10-20 cm, and 20-30 cm) from five spots every month from May to September, 2010. The samples in each plot were mixed to produce a combined sample for soil microbial biomass carbon and nitrogen determination. All soil samples were stored at 2 ℃ before analysis within one week of sampling. The results showed that the microbial biomass C and N for different habitats displayed a vertical distribution in decreasing order of 0-10 cm > 10-20 cm > 20-30 cm. In addition, the microbial biomass C and N in the meadow habitat was greater than that of the reed habitat. During the whole growing season, the microbial biomass C and N in the two habitats showed a "W" shaped variation pattern. The variation profiles of the two habitats decreased with soil depth, but the variation in meadow habitat was significantly larger than that in the reed habitat. However, the correlation analysis showed the soil microbial biomass C in the reed habitat had an extremely significant positive correlation with the soil water content (P < 0.01) and had an extremely significant negative correlation with soil pH value (P < 0.01). The soil microbial biomass N in the reed habitat had an extremely significant positive correlation with soil water content, organic carbon and hydrolysable nitrogen (P < 0.01) and had an extremely significant negative correlation with soil pH value (P < 0.01). The soil microbial biomass C in the meadow habitat had an extremely significant positive correlation with soil water content, organic carbon, available phosphorus, hydrolysable nitrogen (P < 0.01) and had a significant positive correlation with soil pH value (P < 0.05). The soil microbial biomass N in the meadow habitat had an extremely significant positive correlation with soil water content and available phosphorus (P < 0.01) and had a significant positive correlation with organic carbon (P < 0.05). We concluded that the variations in litterfall amount and composition, and the soil physical and chemical properties among the different habitat types mainly contributed to the differences in the seasonal dynamics of the soil microbial biomass C and N in the Zhalong Wetland.
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