Effect of long-term straw mulching and no-tillage on physical properties of meadow soil in cold region.

doi:10.13287/j.1001-9332.201809.025

Abstract

Abstract: The effects of different straw returning technology and farming system on soil physical properties is not clear in Heilongjiang Province, which is located in middle temperature zone with large amount of straw. Here, the effects of straw mulching on soil physical properties in meadow soil under no tillage conditions were studied in field experiments for eight consecutive years (2010-2017). The no straw covering (0%), 30% coverage (30%), 60% coverage (60%) and 100% coverage (100%) were disposed in the experiment. The results showed that straw mulching under no tillage significantly increased soil bulk density by 0.10-0.20 g·cm^-3, which increased with the increases of coverage amount. Straw mulching increased soil solid fraction by 2.5%-7.8%. Soil temperature decreased with the increases of coverage amount, and this trend was more apparent on the surface of soil. The temperature reduction in 0-5 cm soil layer was 1.87-2.90 ℃. Soil water content significantly increased with the increases of straw mulching, with an enhancement of 6.4%-10.2%. Straw mulch decreased the total porosity and diameter of >0.05 mm aeration pores, increased the effective pore size of 0.05-0.002 mm, with the magnitude of such effects being positively dependent on coverage amount. There was no significant effect of straw mulching on inactive porosity of soil. Long-term straw mulching increased soil compaction and soil moisture, reduced soil temperature and total soil porosity, and increased soil available porosity in 0-5 cm soil layer.

WANG Qiu-ju, ZHANG Jing-tao, GAI Zhi-jia, CAI Li-jun, LIU Jing-qi, ZHAO Gui-fan, DU Jia-xing, JIAO Feng. Effect of long-term straw mulching and no-tillage on physical properties of meadow soil in cold region.[J]. Chinese Journal of Applied Ecology, 2018, 29(9): 2943-2948.

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