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Research on Relations Between Growth Effect and Soil Enzyme Activities and Soil Nutrient Factors in Mixed Poplar and Black Locust Plantations

Zhao Linsen;Wang Jiuling(Xinjiang Agricultural University,Urumqi 830052)(College of Forest Resources and Environment,BFU 100083)  
The paper took a 10-year-old mixed experimental plantation of poplar andblack locust in coastal saline-alkai area of the Yellow River Delta as an object of study,dis-cussed the differences of individual tree and stand’s growth,the differences of soil nutrientindexes and enzyme activities between the mixed and pure stands of Populus×xiaozhuanicaw.Y. Hsu et Liang cv.‘Balizhuangyang’and Robinia pseudoacacia,and the relationship be-tween the nutrient and enzymes. Results showed that:①Poplar in mixed stands grew betterthan those in pure poplar stands; total stocks of both types of mixed stands were larger thanthose of pure poplar stands. ②pH value of each layer of the soil profiles in mixed stands wasgenerally lower than the corresponding one in pure stands, whereas the concentrations of or-ganic matter and other nutrient indexes were higher in mixed stands. ③Soil microbialbiomass, urease and several other enzyme activities were significantly correlated with soil nu-trient indexes and among themselves,These conclusions may help partially interpret themechanism that mixed poplar locust plantations usually grows better than pure poplarstands.
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