Biological fertility and its dynamics of degraded soil in Tibet Plateau

In a three-year field trial, this paper studied the dynamics of biological fertility of degraded cultivated mountain shrubby steppe soil in the lower reaches of Lisa River as affected by fertilization. The results showed that under non-fertilized condition, the organic matter (OM) content in soil su...

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Bibliographic Details
Published inYing yong sheng tai xue bao Vol. 17; no. 7; p. 1185
Main Authors Qian, Cheng, Peng, Yuelin, Jia, Junyan, Wei, Na
Format Journal Article
LanguageChinese
Published China 01.07.2006
Subjects
Altitude
Animals
Azotobacter - growth & development
Fertilizers
Humic Substances - analysis
Manure
Organic Chemicals - analysis
Soil - analysis
Soil Microbiology
Tibet
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Summary:In a three-year field trial, this paper studied the dynamics of biological fertility of degraded cultivated mountain shrubby steppe soil in the lower reaches of Lisa River as affected by fertilization. The results showed that under non-fertilized condition, the organic matter (OM) content in soil surface layer declined slightly, but after fertilization, the OM in this layer accumulated with a relatively high rate, humus structure improved obviously, soil bacteria had a significant multiplication, while soil microbial community was still in unharmonious state. With the increasing application rate of organic manure or chemical fertilizers, the OM content in 0 to approximately 30 cm and 30 to approximately 60 cm soil layers showed a significant increasing trend, with an annual increment being 1.35 and 0.67 g x kg(-1), respectively, and the ratio of humus carbon (C) to organic C and of humic acid C to humus C was also increased. Fertilization had a significant promotion effect on the multiplication and activity o
ISSN:1001-9332