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The effects of molybdenum and boron on the rhizosphere microorganisms and soil enzyme activities of soybean

100%

Sun T. , Wang Y. P. , Wang Z. Y. , Liu P. , Xu G. D.

Acta Physiologiae Plantarum

2013

tom 35

nr 03

This study examined the effects of molybdenum (Mo) and boron (B) on the rhizosphere microorganisms and the soil enzyme activities of soybean. The soybeans were treated with seven different Mo and B supplements (control: without Mo and B) Mo1 (0.0185 g kg-1), B1 (0.08 g kg-1), Mo1 + B1 (0.0185 ? 0.08 g kg-1), Mo2 (0.185 g kg-1), B2 (0.3 g kg-1) and Mo2 ? B2 (0.185 + 0.3 g kg-1) throughout the plants’ four growth stages. The results showed that Mo, B, and combined Mo and B treatments increased the soil microbial populations, stimulated the rhizosphere metabolisms, and improved the soil enzyme activities. These stimulatory effects varied in intensity among the treatment groups. The Mo and B combination treatments were more beneficial for the soybean rhizosphere soil than that of Mo-only or the B-only treatments, which suggests that the two elements have complementary functions in the biological processes of the soybean rhizosphere.

Seismic damage behaviour of aeolian sand reinforced concrete columns with I-shaped structural steel

86%

Wang Y. H. , Wang H. Y. , Wang Y. P. , Zhao M. , Qi J. , Huo G. Z. , Liu P. Q.

Archives of Civil Engineering

2020

tom Vol. 66, nr 4

633--650

To promote the application of aeolian sand resources for steel-concrete composite structures, an aeolian sand reinforced concrete column with I-shaped structural steel is proposed in this study. Four specimens are designed and manufactured with different replacement rates of aeolian sand. The seismic behaviour and damage evolution process of the specimens are studied by low-cycle repeated loading tests. Based on the test results, the mechanical characteristics, failure modes, hysteresis curves, skeleton curves, energy dissipation capacity, displacement ductility, and stiffness degradation of the specimens with different replacement rates of aeolian sand are analysed. In addition, the effects of the design parameters on the seismic behaviour of the specimens are also studied. The results show that the indexes of the seismic behaviour can be significantly improved by adding steel. Moreover, a revised damage model is proposed, to better reflect the evolution law of seismic damage of aeolian sand reinforced concrete columns with steel. The proposed model can provide an important reference for seismic damage assessment of the columns.