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Characteristics of nutrient cycling of different vegetation types in the Zhifanggou Watershed on the Loess Hilly Region

ZHAO Hu-bing~1,LIU Guo-bin~(1,2),HOU Xi-lu~(1,2)(1.College of Resources and Environment,Northwest Agriculture and Forest University,Yangling 712100,China;2.Institute of Soil and Water Conservation,CAS,Yangling 712100,China)  
The Zhifanggou watershed in Ansai county is an example of a Loess Hilly Region and the characteristics of nutrient cycling and balance of 1 tree,4 shrub,and 9 herbage vegetation types have been systematically studied during a period of vegetation stabilization and rehabilitation.The results showed that nutrient content of leaves was higher than that in newshoots of wattle trees which was higher than that in limbs and trunks.The accumulated biomass,N and P_2O_5 of tree vegetation was higher than that of shrubs,which was higher than that of herbage vegetation.The speed of N recycling of tree vegetation was 0.789,while that of shrub and herbage vegetation was 0.742 and 1.000,respectively.The speed of P_2O_5 recycling of tree vegetation was(0.881),while shrub and herbage vegetation was 0.758 and 1.000,respectively.The amounts of N surplus of tree,shrub and herbage vegetation were 333.0,508.5 and 597.0 kg/(km~2·a) respectively.The P_2O_5 surpluses of tree shrub and herbage vegetation were 333.0,423.0,and 531.0 kg/(km~2·a),respectively.
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