To study the effect of different tillage and mulching measures on enzyme activities of apple orchard soil in WEIBEI Plateau Shaanxi province, three conservation tillage managements of no-tillage, moldboard plowing and rotary tillage under corn straw mulching, plastic film mulching and growing grass were analyzed and compared with each other. Results showed that: the enzyme activities of catalase, sucrase, urease were significantly different between these different treatments（P<0.05), tillage practice combined with mulching could increase the enzyme activities of soil; but the combination of tillage and mulching could effectively increase these three enzyme activities, In all treatments, moldboard plowing combined with stubble mulch had the best effect, and the three enzyme activities under the moldboard plowing combined with stubble mulch treatment increased by 13.82%, 27.41% and 363.26% compared to the control (moldboard plowing with no-mulch); but in different soil layers, the enzyme activities were different, the activities of sucrase and urease decreased with depth while the activities of catalase increased. So moldboard plowing combined with stubble mulch can increase the enzyme activities of soil and improve the micro-surroundings of the soil in WEIBEI Plateau.

tillage practice, mulching, apple orchard soil, enzyme activities

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• S 66