Study On Seasonal Dynamic And Deficiency Of Eight Mineral Elements In Soil-Herbage-Animal Ecosystem In The West Of QingHai Provience

The trail was made to study the seasonal dynamic and deficiency of three macro-minerals(Nitrogen;Sulfur;Magnesium) and five trace minerals (Copper; Manganese; Zinc; Selenium; Molybdenum)in soil-herbage-animal ecosystem in the west of QingHai province during the Spring (Apr. to may),Summer(Jul. to Aug)and Autumn(Oct. to Nov.),2004. The results showed as follows.?Soil: The content of total Nitrogen and available Sulfur in Summer were significently higher than that in Spring and Autumn; Magnesium was enough; The contentment of Copper in Spring was lower than the normal level while that was normal in Summer and Autumn; The content of Manganese was in normal in Spring and Summer but lower than the contentment our country (710μg/g) .The soil was rich in Zinc; Selenium range was in serious lack condition in three seasons; The content of Molybdenum(0.0922μg/g) was more lower than the lowest-limit content of our country.?Herbage:In Spring , Summer and Autumn, The content of Nitrogen in edible herbage were unable to meet the requirement of sheep for healthy growth, and that was far from lower than in Spring and Autumn, which was low to the requirement of the sheep. In Summer, the content of Sulfur in edible herbage was more higher than that in Spring and Autumn. The content of Magnesium in herbage was lower than the standard from NRC(1985),but more higher than that around Qinghai Lake; In Summer, the Copper in herbage could reach the normal requirements of the sheep, while lack in Spring and Autumn; The content of Manganese was 124.24μg/g in Summer, which was two times than the breeding standard, and was close to floor level of it in Autumn(20.85μg/g);The content of Zinc in herbage(10.00μg/g) was lower than the standard from NRC; The herbage was seriously short of Selenium and molybdenum. ③Serum: In Spring and Autumn, albumin in serum were significantly lower than that in Summer(P<0.01),and significantly lower than normal contentment of sheep; Urea nitrogen in serum changed from 8.23 mg/100mL to 23.08mg/100mL, the peak value appeared in Summer, while with lower level in Autumn; The content of total sulfur serum in summer was higher than that in autumn ,and that in spring was the lowest; the Magnesium nutrition in sheep body was in condition. The content of Manganese was enough for the requirement of the sheep. Zinc in serum was changed from 0.92μg/mL to 1.20μg/mL and the condition of Selenium was seriously low while that of Molybdenum was in normal. ④Sheep Hair: In Spring ,Summer and Autumn, the content of Sulfur in hair was respectively 1.93%,1.87%and 1.91%; The content of copper in sheep hair was lower and Zinc was changed from 87.27μg/g to 117.78μg/g; Selenium was in serious lack .