[Effects of nitrogen addition on soil physico-chemical properties and enzyme activities in desertified steppe].
Ying Yong Sheng Tai Xue Bao
; 25(3): 664-70, 2014 Mar.
Article
en Zh
| MEDLINE
| ID: mdl-24984481
ABSTRACT
To investigate the impacts of nitrogen (N) enrichment on soil physico-chemical property and soil enzyme activities in desert ecosystems, a field experiment by adding N at 0, 1.75, 3.5, 7, or 14 g N x m(-2) a(-1) was conducted in a temperate desert steppe in the southeastern fringe of the Tengger Desert. The results showed that N addition led to accumulations of total N, NO(3-)-N, NH(4+)-N, and available N in the upper soil (0-10 cm) and subsoil (10-20 cm), however, reductions in soil pH were observed, causing soil acidification to some extent. N addition pronouncedly inhibited soil enzyme activities, which were different among N addition levels, soil depths, and years, respectively. Soil enzyme activities were significantly correlated with the soil N level, soil pH, and soil moisture content, respectively.
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01-internacional
Base de datos:
MEDLINE
Asunto principal:
Suelo
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Pradera
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Enzimas
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Nitrógeno
Idioma:
Zh
Revista:
Ying Yong Sheng Tai Xue Bao
Asunto de la revista:
SAUDE AMBIENTAL
Año:
2014
Tipo del documento:
Article