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作 者 ：胡婵娟,傅伯杰,刘国华*,靳甜甜,刘宇

期 刊 ：生态学报 2009年 29卷 2期 页码：727~733

关键词：土壤微生物；多样性；微生物生物量碳；微生物活性；人工林；黄土高原；

Keywords:soil microbe, diversity, microbial biomass carbon, microbial activity, artificial woodland, Loess Plateau,

摘 要 ：对典型黄土丘陵沟壑区陕西延安羊圈沟小流域刺槐（Robinia pseudoacacia）、沙棘（Hippophae reamnoides）和杏树（Prunus armeniaca）人工林下土壤微生物功能多样性进行监测研究，旨在揭示不同的人工林对土壤微生物生物量及多样性的影响。研究结果如下：（1）3种人工林中刺槐林土壤微生物生物量碳（MBC）和微生物生物量氮（MBN）含量显著高于其他两种林地；（2）表征土壤微生物代谢活性的平均颜色变化率（AWCD）与微生物生物量碳的高低表现一致，依次为刺槐林＞沙棘林＞杏树林，相关分析表明其与微生物生物量、总氮及土壤水分等存在显著相关性；（3）土壤微生物的功能多样性3种人工林间未见显著差异，Shannon-Winner多样性指数（H′）表现为刺槐林＞杏树林＞沙棘林，与土壤理化性质和微生物生物量间均未见显著相关性。总之，3种人工林相比较，种植刺槐林与其它两种人工林相比更有利于提高微生物的量及代谢活性，微生物的功能多样性受不同树种的影响较小。

Abstract:To investigate the effects of different artificial woodlands on soil microbial biomass and microbial functional diversity, a case study was done on three artificial woodlands (Robinia pseudoacacia, Hippophae reamnoides, and Prunus armeniaca) in the hilly area of the Loess Plateau, located at the Yangjuangou catchment, Yanan city, Shannxi. Among the three artificial woodlands, we found soil microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) of Robinia pseudoacacia were both highest. The average well color development (AWCD), which represents soil microbial metabolic activity, followed a similar trend with MBC, in the order of Robinia pseudoacacia＞ Hippophae reamnoides＞Prunus armeniaca. AWCD was also significantly correlated with microbial biomass, total nitrogen, and soil moisture. The difference in microbial functional diversity among the three artificial woodlands was not significant; Shannon-Winner index was Robinia pseudoacacia＞Prunus armeniaca＞Hippophae reamnoides and did not have obvious correlations with microbial biomass or soil physiochemical characteristics. We draw the following conclusions: (1) among three artificial woodlands, Robinia pseudoacacia had the most microbial biomass and activity; (2) there were no significant effects of the different artificial woodlands on soil microbial diversity.

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