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中文摘要：
以黄土丘陵沟壑区典型小流域纸坊沟流域为例，系统研究流域在植被稳定恢复期1种乔木、4种灌木和9种草地植被类型的养分循环平衡特征。结果表明，乔灌植被类型的叶片养分含量明显高于当年的新生枝条．新生枝条则明显高于枝干；乔木植被类型的生物量、氮磷养分累积量明显高于灌木植被类型，灌木植被类型则高于草地植被类型；乔木的氮养分循环速率是0．789，灌木为0．742．草地为1．000；乔木P2O5循环速率是0．881．灌木为0．758，草地为1．000。乔木的氮养分年盈余量是333．0kg／km^2，灌木为508．5kg／km^2，草地为597．0kg／km^2；乔木的P2O5年盈余量是333．0kg／km^2，灌木为423．0kg／km^2，草地为531．0kg／km^2。
英文摘要：
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 P2O5 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 P2O5 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/（km2·a） respectively. The P2O5 surpluses of tree shrub and herbage vegetation were 333.0, 423.0, and 531.0 kg/（km^2·a）, respectively.
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