Soil enzyme activities of shrub plantation in Loess Hilly Region
WEI Zhen-Rong-； Liu-Guo-Ban-； Xue-Sha-； Li-Feng
1.Institute of Soil and Water Conservation,Chinese Academy of Sciences & Ministry of Water Resources Northwest A&F University,712100,Yangling,Shaanxi;2.Graduate School of the Chinese Academy of Sciences,100049,Beijing;3.Shaanxi Highway Green Co.Ltd.710054,Xi’an;4.Xi’an University of Technology,710048,Xi’an: China
Abstract：In order to reveal changes of soil enzyme activity after revegetation in Loess Plateau,shrub plantation at different ages on Loess Hilly Region was chosen,slope cropland and Platycladus orientailis L.stand were selected as control at the same time.In addition,soil enzymes index was also put forward.The results showed that after revegetation,soil urease,phosphatases,saccharase,cellulase and catalase,respectively increased compared to the slope cropland.Enzyme activity in Hippophae rhamnoides Linn.stand is higher than that in Caragana korshinskii Kom stand at the same ages.Soil polyphenol oxidase decreased with years and amylase did not change significantly.The relationships analysis showed that except urease and amylase,significantly positive relationship were observed among phosphatase,saccharase,cellulase,catalase but negative with polyphenol oxidase,which were also significantly correlated with soil fertility factors such as organic matter,total nitrogen and available nitrogen.It can be concluded that poor soil enzyme activity of slope cropland under erosive environment owing to human cultivation activities was improved greatly after plantation,but still lower than that of Platycladus orientailis L.stand,the climax community before vegetation destruction.Soil enzyme index can be used as biological indicators for assessing soil quality.
2010, Vol. 8 
