Effects of Flaveria bidentis invasion on soil nitrogen cycling and soil microbial biomass in different regions

doi:10.11686/cyxb20150208

Abstract

Abstract: The effect of plant invasion on soil ecosystems has attracted increased attention from ecologists. To study the influences of Flaveria bidentis invasion on soil nutrients, enzyme activities and soil microbial biomass in different regions, soils were sampled at three sites: in Jinghai County in Tianjin and in Xian County and Hengshui City in Hebei Province. Results indicate that the invasion of F. bidentis changed the soils’ chemical and biological characteristics, but that these changes varied by regions. Total soil nitrogen increased in Jinghai and Xian but decreased in Hengshui, compared to the control. Soil nitrate was significantly lower in Jinghai and Hengshui while significantly higher in Xian than the control. Changes in the Potential Nitrification Rate followed the same pattern as that of nitrate. Nitrogen cycling-related enzyme activities also changed differently across the three regions. Soil microbial biomass carbon increased by 27.05%, 57.62% and 40.31% in Jinghai, Xian and Hengshui, respectively. Soil microbial biomass nitrogen increased by 37.40% in Jinghai and by 106.48% in Xian. These regional differences may be related to soil nutrient status before the invasion of F. bidentis. This study suggests that different management strategies should be taken in different invasion regions.

ZHAO Xiaohong, YANG Dianlin, WANG Hui, LIU Hongmei, QU Bo, HUANGFU Chaohe. Effects of Flaveria bidentis invasion on soil nitrogen cycling and soil microbial biomass in different regions[J]. Acta Prataculturae Sinica, 2015, 24(2): 62-69.

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