Stoichiometry of soil carbon,nitrogen,phosphorus and enzyme activities at various elevations in the Dry-Hot Valley of the Jinsha River
[Objective]The ecological environment in the Dry-Hot Valley of the Jinsha River is harsh,resulting in poor vegetation growth and development.Exploring the soil carbon,nitrogen,phosphorus stoichiometry and enzyme activities in this area is of great significance to the vegetation restoration and ecological management in the Dry-Hot Valley of the Jinsha River.[Method]The soil in the upper,middle and lower reaches in the Dry-Hot Valley of the Jinsha River,spanning elevations from 800 m to 2000 meters,were selected as the research sub-jects.Through field investigations,soil collection and laboratory analysis,the basic physical and chemical properties,carbon,nitrogen and phosphorus contents,as well as soil enzyme activities were tested in this region.[Result]Under the influence of various environmental fac-tors including climate,soil and vegetation at different altitudes in the Dry-Hot Valley of the Jinsha River,the contents of soil organic carbon,total nitrogen,and total phosphorus in the upper,middle and lower reaches significantly increased with increasing altitude(P＜0.05);The harsh environmental factors in the Dry-Hot Valley of the Jinsha River had resulted in soil C/N,C/P and N/P values being lower than the na-tional average.Under the influence of climate,soil,vegetation and other environmental factors at different altitudes in the Dry-Hot Valley of the Jinsha River,the enzyme activities of soil urease,β-glucosidase and acid phosphatase in the upper,middle and lower reaches of the Jin-sha River all increased significantly with increasing altitude(P＜0.05).Moreover,the content of soil carbon,nitrogen and phosphorus at various altitudes was positively correlated with soil urease,β-glucosidase and acid phosphatase activities(P＜0.01).The correlation among the elements provided more objective reflection of soil quality and changing characteristics in the Dry-Hot Valley of the Jinsha River.[Con-clusion]The stoichiometric characteristics of soil carbon,nitrogen and phosphorus,along with soil enzyme activity,exhibit high spatial het-erogeneity at altitudes ranging from 800 to 2000 meters in the upper,middle and lower reaches of the Dry-Hot Valley of the Jinsha River.As altitude increases,there is corresponding increase in the content of soil carbon,nitrogen and phosphorus as well as enzyme activity.
The Dry-Hot ValleyElevationSoilStoichiometryEnzyme activity
NETL
NSTL
万方数据
维普
