Title: Variation characteristics of soil respiration rate in Ulmus pumila Robinia pseudocaciain different forest types during the growing season
Abstract: 【Objective】 The study was done to analyze the daily and monthly variation characteristics of soil respiration rate in pure Ulmus pumila forest(BB),pure Robinia pseudoacacia forest(CC) and U.pumila-R.pseudoacacia mixed forests and explore the leading factors affecting soil respiration rate of the study area.【Method】 Five kinds of forest types soil respiration rate were measured by LI-8100 soil carbon flux automatic observing system during the growing season of pure U.pumila forest,pure R.pseudoacacia forest and U.pumila-R.pseudoacacia mixed forests with different proportions(1∶1(1B1C),1∶2(1B2C),and 2∶1(2B1C)) at Yangling district in Shaanxi Province.And the soil temperature at the surface and 5 cm,10 cm,15 cm underground and the soil moisture content at 10 cm underground were measured by probes with LI-8100 attached at the same time.【Result】 The daily variation of soil respiration rate in June,July and September all showed single-peak curve in different types of U.pumila and R.pseudoacacia.The peak time occured between 12:00-15:00 in the afternoon and then the soil respiration rates began to decline gradually.The peak value of soil respiration rate of 1B2C in mixed forest was higher than other forest types in July(4.193 μmol/(m2·s)) and September(4.283 μmol/(m2·s)).The soil respiration rate showed significant monthly variation and the maximum rate appeared from July to September.From May to September,the soil respiration rate of pure U.pumila forest was lower and the mixed forest of 1B2C was higher in the five different forest types.Soil respiration rate varied similarly to soil temperature and they showed a strong positive correlation between them,especially with soil temperature at 5 cm depth.Soil respiration rate and the relationship between soil water content of discrete performance and the relevance between them were not notable.【Conclusion】 The soil respiration rate of pure U.pumila forest was lower and the mixed forest of 1B2C was higher in different forest types.The main factor affecting the soil respiration rate of pure U.pumila forest,pure R.pseudoacacia forest and U.pumila-R.pseudoacacia mixed forests was soil temperature at 5 cm depth in the district and the relevance between soil respiration rate and soil moisture content was not notable.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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