沙区植被恢复对土壤微生物量及活性的影响

doi:10.7522/j.issn.1000-694X.2017.00005

摘要/Abstract

摘要： 土壤微生物是生态系统功能及养分循环的关键影响因素，对土壤质量变化有重要的指示意义。研究了干旱沙区植被恢复过程中土壤微生物量及微生物活性的变化特征及其季节动态。结果表明：固沙植被区土壤微生物量碳氮和土壤基础呼吸显著大于流动沙丘，总体上表现为同一土层土壤微生物量碳氮和基础呼吸速率随植被恢复年限的延长而增加，而同一年代植被区则随土层深度的增加而减小。土壤微生物代谢熵随固沙年限的延长呈下降趋势，随土层深度的增加而增大。土壤微生物量和基础呼吸呈现出明显的季节变化，表现为夏季 >秋季 >春季 >冬季，且随着恢复年限的延长其变化幅度增大；微生物代谢熵不存在明显的季节变化。土壤微生物属性能够较好地反映沙区植被恢复引发的土壤质量变化。

关键词: 土壤微生物量, 土壤微生物活性, 季节动态, 固沙植被, 沙区

Abstract: Soil microbes play a key role in the functioning and nutrients cycling of ecosystem, and soil microbial parameters are commonly used as indicators of soil quality changes after revegetation of degraded lands. The dynamics processes and seasonal patterns of soil microbial biomass and activity were investigated based on a chronosequence sampling, the results showed that: soil microbial biomass carbon (MBC) and nitrogen (MBN) and basic respiration (BR) were greater in revegetation area than those in mobile sand dunes. In general, for the same soil layer, MBC, MBN and BR increased with the lapse of time after revegetation, while for the same vegetation age, they decreased with the increase of soil depth. Soil microbial metabolic quotient (q_CO₂) showed a declining trend as time goes on, but increased with soil depth. MBC, MBN and BR showed distinctive seasonal patterns, they were in the order: summer> autumn> spring> winter, and the amplitudes of seasonal variation increased with the plantation age, which were the results of combined effects of several environmental factors. No statistical seasonally variations were found for q_CO₂. In comparison with soil physiochemical properties, soil microbial biomass and the activities recovered much more rapidly, which means that microbial parameters can reflect soil quality changes after restoration of desertified regions.

Key words: soil microbial biomass, soil microbial activity, seasonal dynamics, sand-stabilized vegetation, desertified area

中图分类号:

Q938.1

石万里, 王辉, 马维伟. 沙区植被恢复对土壤微生物量及活性的影响[J]. 中国沙漠, 2017, 37(3): 507-513.

Shi Wanli, Wang Hui, Ma Weiwei. Effects of Vegetation Restoration on Soil Microbial Biomass and Activity in Desert Area[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(3): 507-513.

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