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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (4): 22-31.doi: 10.11707/j.1001-7488.20140404

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Soil Nutrients and Microbial Functional Diversity of Different Stand Types in Qinghai Province

Xiang Zeyu1,2, Zhang Li3, Zhang Quanfa1, Liu Wei4, Wang Genxu5, Wang Changting2, Hu Lei2   

  1. 1. Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical Garden, CAS Wuhan 430074;
    2. College of Life Science and Technology, Southwest University for Nationalities Chengdu 610041;
    3. Alxa Forestry Research Institute of Inner Mongolia Alxa 750306;
    4. Northwest Institute of Plateau Biology, CAS Xining 810001;
    5. Institute of Hazards and Environment, CAS Chengdu 610041
  • Received:2013-05-27 Revised:2014-03-03 Online:2014-04-25 Published:2014-05-06
  • Contact: 王长庭

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Abstract:

In this study, soil nutrients and microbial community functional diversity of different stand types in Qinghai Province were investigated by conventional laboratory analysis and Biolog-Eco micro plate method. Results showed that Datong 1#, Huangzhong and Jianzha had relative higher content of organic matter, total nitrogen and available nitrogen in the soil, then Datong 2#, Xunhua and Ledu were in intermediate, and Minhe was lower. The total phosphorus content of Minhe was lowest, while there were no significant differences in total phosphorus content between other stand types. The available phosphorus content was Xunhua, Jianzha, Huangzhong > Datong 1#, Datong 2#, Ledu > Minhe, and the available potassium content was Datong 2#, Minhe > Ledu > Datong 1#, Huangzhong, Xunhua, Jianzha. The total potassium content of each stand type was not significantly different. The accumulation of overall soil nutrients in different stand types was in turn Datong 1#, Jianzha > Huangzhong > Xunhua > Datong 2# > Ledu > Minhe. Effects of four tree species on the distribution and improvement of soil nutrients were in sequence of Picea asperata > Betula platyphylla > Populus davidiana > Larix gmelinii. The soil microbial community functional diversity index in the various stand types was Ledu, Minhe > Datong 1#, Datong 2#, Huangzhong, > Xunhua, Jianzha. The principal component analysis of carbon source utilization of the soil microbial community in different stand types showed that carbohydrates and amino acids were the main carbon source. RDA of each stand type soil nutrient content and microbial community functional diversity indicated that soil nutrient factors well explained the variation of the microbial community functional diversity. Soil nutrient had important influence on microbial community functional diversity. The organic matter, nitrogen and available phosphorus were the main factors influencing the metabolism of soil microbial communities.

Key words: Qinghai, different stand types, soil nutrients, microbial community, Biolog-ECO plate, principal component analysis(PCA)

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