首页 > 未分类 > Dr. Xiao Hai-feng published paper in Soil Biology & Biochemistry

Dr. Xiao Hai-feng published paper in Soil Biology & Biochemistry

2017年7月7日

Understanding mechanisms of successful colonization by exotic plant species in non-native habitat is critical to meet long-term restoration aims. Previous studies demonstrated that overgrowing plants can alter resources, especially soil inorganic nitrogen availability and get benefits from positive feedback. However, comprehensive knowledge on particular mechanisms underlying their successful colonization remains unclear.

Soil ecology group researchers Dr. Haifeng Xiao and Prof. Xiaodong Yang combined field examinations and laboratory manipulations to investigate significant impact of overgrowing Ageratina adenophora on soil NO3-N availability and nitrification. Interestingly, they found significant enhancement in soil total N, NO3-N, pH, potential nitrification rates, and ammonia oxidizing bacteria (AOB), while reduced abundance of ammonia oxidizing archaea (AOA) under the influence of A. adenophora. Notably, AOB abundance was positively correlated with both pH and soil potential nitrification rates. AOA abundance was negatively correlated with pH and had no significant correlation with soil nitrification potential. Both AOA and AOB communities significantly differed between populated and non-populated soils. It is worth mentioning here that pH was the strongest factor contributing to this community difference. Results also showed that A. adenophora has strong long-term preference for nitrate which can further increase soil pH. Their data clearly helps to gain insight into a probable mechanism indicating that A. adenophora stimulates nitrification with the help of AOB rather than AOA under relatively higher soil pH condition.

This study, titled:pH drives ammonia oxidizing bacteria rather than archaea thereby stimulate nitrification under Ageratina adenophora colonization, was published in international journal “Soil Biology & Biochemistry”. This work was supported by the CAS 135 program (XTBG-T01), CAS “Light of West China” Program and the National Science Foundation of China (NSFC) grant (31200409).

Fig. 1. (a) A. adenophora populated area, (b) nonpopulated area nearby.

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