Water Content And Nutrient Structure Characteristics Of Amorpha Fruticosa In Different Growth Stages

Nutrient content of plant not only can reflect absorption capacity of the nutritional elements under certain environmental conditions, but also is an integral part of the nutrient cycling. The aim was to investigate water content of stem and leave and the nutrient structure of Amorpha fruticosa. The water content and nutrient content of leaf, the stem and root of different diameter of Amorpha fruticosa in growing season was studied. C, N, P, K, Ca, Mg, Fe, Mn, Cu and Zn were analysed, several important conclusions can be drawn from this study.1. the GW/DW ratio was higher and Amorpha fruticosa was suitable for green fodder in early growth stages. The GW/DW ratio was lower and Amorpha fruticosa was suitable for hay in late growth stages. The stem/leaf ratio increased month by month and was from0.74in early June to1.71in early September. The stem/leaf ratio of Amorpha fruticosa was lower in early growth stages, so it had high proportion of leave and more nutrients and good palatability. In other words, the quality of Amorpha fruticosa was good in early growth stages. The stem/leaf ratio of Amorpha fruticosa was higher in late growth stages, so it had low proportion of leave and less nutrients and bad palatability. In other words, the quality of Amorpha fruticosa was bad in late growth stages.2. stems、 leaves and total biomass per plant above ground showed a significant negative correlation with soil moisture content at different depths. Water content of stems and leaves showed a negative correlation with soil moisture content at different depths. The above reresults showed that the plant of Amorpha fruticosa had a strong water absorption and water holding capacity and drought resistance, the plant of Amorpha fruticosa was suitable for development in northwest arid and semiarid areas.3. The nutrient content of N, P and K had an opposite relationship with diameter of stem and root. In other words, the nutrient content reduced with the increase of the diameter. The site of the highest content was leaf, the stem and root of thin diameter. There was more organic carbon, N, Ca, Mn and Cu in leaf than in stem and root of Amorpha fruticosa in the whole growth season. The order of macroelement content in leaf was C>N>K>Ca>Mg>P and the order of trace element content in leaf was Fe>Mn>Zn>Cu.4. The selective absorption capacity of the Zn was strongest. Absorption coefficient of Zn was745.00. The selective absorption capacity of the Mn was stronger. Absorption coefficient of Mn was216.61. The order of selective absorption capacity of elements was Zn>Mn>Fe>N >Cu>P. Although various elements content was low in soil, it maintained a high level in Amorpha fruticosa to meet its normal growth and development needs by a strong absorption or accumulation ability.The adaptability of the barren environment was improved at the same time.5. The decline of soil moisture was helpful for enrichment of calcium and magnesium. The decline of soil moisture was not helpful for enrichment of nitrogen、 phosphorus、 potassium、iron、 zinc and copper. The adverse effect on iron and zinc was smaller.