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Acta Prataculturae Sinica ›› 2016, Vol. 25 ›› Issue (8): 180-188.DOI: 10.11686/cyxb2015500

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Effects of living mulch on soil physical and chemical properties in orchards: a review

CAO Quan, SHEN Yu-Ying*, WANG Zi-Kui, ZHANG Xiao-Ming, YANG Xuan   

  1. State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
  • Received:2015-11-03 Revised:2015-12-28 Online:2016-08-20 Published:2016-08-20

Abstract:

A review has been undertaken to provide a basis for further research on and the application of living mulch practices in orchards. The effects of living mulch on soils’ physical and chemical properties make an important contribution to intensive, efficient, ecological and sustainable production. Forage cultivation can reduce soil bulk density by 4.7%-13.0% and improve the content of soil aggregates, thus enhancing hydraulic properties and water retention capacity. Forage cultivation can also help to raise rainfall interception and improve water use efficiency. Forage grass will compete for water with fruit trees in drought seasons, though adverse effects can be reduced by selecting appropriate grass varieties and strengthening field management. Forage grass cover can improve soil organic carbon (SOC) content. SOC can be improved by 19.6%-27.8% after planting forage grass for 6 years. The accumulation of SOC increases as the duration of forage planting increases. Living mulch can help to adjust soil temperature, which enhances microbial diversity and enzymatic activity. Living mulch will directly deplete soil nutrients, but the increase in the number of microorganisms can promote the decomposition of organic matter that increases nutrients. Moreover, legumes add nutrients through nitrogen fixation. Living mulch usually has a positive effect on soil nutrient accumulation.