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《Chinese Journal of Ecology》 2016-12
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Soil microbial properties in Larix principis-rupprechtii plantations of different ages in Mt.Taiyue,Shanxi,China

WU Ran;KANG Feng-feng;HAN Hai-rong;CHENG Xiao-qin;ZHOU Wen-song;WANG Luo-xin;CHEN Jing;TIAN Ping;Key Laboratory of Forest Cultivation and Conservation of Ministry of Education,Beijing Forestry University;  
Soil microorganisms play an important role in carbon and nitrogen cycling. Changes in litterfall and soil properties due to stand age can have important implications to soil carbon( C)and nutrient cycling via microbial pathway. Soil degradation has widely occurred in Larix principis-rupprechtii plantation because of its simple forest structure; however,little is known about how soil nutrients are related to soil microbial properties. Here we determined soil microbial responses to different aged L. principis-rupprechtii plantations( 18-,35-,and 51-year-old) in Taiyue Mountain of Shanxi Province. The results showed that soil microbial biomass C and the proportion of microbial biomass C to the sum of microbial biomass C and dissolved organic C increased with the increase of stand age. Soil microbial biomass C/N ratio in the 51-year-old L. principis-rupprechtii plantation was the highest( 13),being 60% higher than that in the 18-and 35-year-old L. principis-rupprechtii plantations. The microbial carbon entropy ranged from 1.5% in the 35-year-old L.principis-rupprechtii plantation to 2.8% in the 18-year-old L. principis-rupprechtii plantation. Soil microbial biomass N,fungal Shannon diversity,soil and litter C/N ratios decreased in the following order: 35-year-old 18-year-old 51-year-old plantations. Fungal community structure diversity had a direct effect on soil microbial biomass C,while litter C/N had a significant effect on soil microbial biomass N,and soil and microbial biomass C/N ratios were the direct factors regu-lating soil fungal community structure diversity. In general,the active organic C content in the35-year-old L. principis-rupprechtii plantation was lower than those in the other two plantations,and its carbon pool was more stable and nutrient situation was better.
【Fund】: 林业公益性行业科研专项(201404213)资助
【CateGory Index】: S714.3
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