| Effect of different amount of straw mulching on soil enzyme activities in dry land |
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| DOI：10.7606/j.issn.1000-7601.2009.04.29 |
| Key Words: spring maize straw mulching soil enzyme activities |
| Author Name | Affiliation | | LI Qian | Research Center of Agriculture in the Arid and Semiarid Areas, Northwest A &F University, Yangling, Shaanxi 712100, China | | ZHANG Rui | Research Center of Agriculture in the Arid and Semiarid Areas, Northwest A &F University, Yangling, Shaanxi 712100, China | | JIA Zhikuan | Research Center of Agriculture in the Arid and Semiarid Areas, Northwest A &F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Field fixed position experiments were conducted to study the effect of different amount of straw covering on soil enzyme activitie
s in Heyang Country of Shaanxi Province. The results showed that: Straw covering could accelerate soil enzymatic activities, in the layer between 0 cm and 20 cm the activities of invertase and alkaline phosphatase were 46.9% and 9.0% higher respectively than that in the control and reached the maximum when the fields were mulched with 9 000 kg/hm2 of maize straw; Urease activity reached the maximum when the fields were mulched with 13 500 kg/hm2 of maize straw，and urease activity in the surface increased by 3.6 times compared to the control； With the increase of soil depth, the activities of urease, invertase and catalase reduced, and the difference of alkaline phosphatase activity in different levels was not significant. |
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