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Influences of Stocking Rates on C,N,P Contents in Plant-Soil System

Li xiangzhou; Chen Zuozhong(Institute of Botany, Chinese Academy of Sciences, Beijing 100093)  
Effects of stocking rates on C, N, P contents and distributions in Plant-soil system in Leymus chinensis steppe, Inner Mongolia. There are four treatments in the control experiment: 1. 33sheep/hm2,4 sheep/hm2,6.67 sheep/hm2 and a ungrazed Plot. The results indicated that plan species,aboveground and underground biomass, chemical composition in Plant and soil have changed greatly after 8grazing years. The aboveground and underground biomass in 0~ 60cm are significantly higher than those in grazing treatments, but not significantly different among the grazing treatments . Plant carbon content was higher under control and 1.33 sheeo/hm2 than those under 4 and 6.67 sheep/hm2, but N, P content, vice versa. C/N and C/P ratio in plant were smallest in 4 sheep/hm2 treatment. It had showed significant surfication of root and nitrogen content in root under 6.67 sheep/hm2 treatment. Soil C in 0 ~10cm depth under control treatment was higher than those of other three grazing treatments. No significantdifference of soil C in 0 ~ 10cm soil layer was observed among three grazing treatments. Soil organic carbon and nitrogen contents were significantly positive to root biomass.Inorganic N in 0 ~ 10cm soil was highest in 4 sheep/hm2. Soil microbial C and P in 0 ~ 10cm depth were significantly reduced only under6. 67 sheep/hm2. Soil microbial biomass N was higher under 4 and 6.67 sheep/hm2.
【Fund】: 国家自然基金!49790020
【CateGory Index】: S812.6
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