| Effects of N, P and K fertilization on soil enzyme activities and soil fertility in mintane Jujube forest of hilly loess region |
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| DOI：10.7606/j.issn.1000-7601.2012.04.10 |
| Key Words: soil enzyme Jujube forest soil fertility NPK |
| Author Name | Affiliation | | LI Huijie | Collage of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | XU Fuli | Collage of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shannxi 712100, China | | LINYun | Collage of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | LUAN Xiaobo | Collage of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Soil enzymes play an essential role in catalyzing reactions necessary for decomposition of organic matter and nutrient cycling in ecosystems, involving a range of plants, microorganisms, animals and their debris. Field experiment and laboratory analysis were carried out to investigate soil enzyme activities and soil fertility affected by successive 4-year N, P, K fertilization in montane jujube forest of hilly loess region. The results showed that successive NPK1 fertilization could significantly increase the soil activities of urease, phosphatase, cata
lase and invertase. Similarly, the contents of organic matter, both total N and available N, P and K were increased. From surface layer to in-depth layer, the soil enzyme activities and the contents of available N, P and K reduced in turn. The relative analysis suggested that there was a significantly positive correlation between soil phosphatase activity and the contents of organic matter, available P, catalase activity and the contents of organic matter and total N in 0～20 cm soil layer. In 20～40 cm soil layer, the positive correlation of soil urease activity with the contents of organic matter, total N, available N, phosphatase activity with the contents of available K, catalase activity with the contents of available P, invertase activity with the contents of organic matter, available K were significant. In 40～60 cm soil layer, positive correlation was found between urease activity with the contents of total N, available P, phosphatase
activity with the contents of organic matter, available N, atalase activity with the contents of available P, invertase activity with the contents of organic matter, total N and available P. |
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