Leucaena-KX2 mulch additions increase growth, yield and soil C and N in a managed full-sun coffee system in Hawaii

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• 作者：Adel H. Youkhana ; Travis W. Idol
• 关键词：Coffee yield ; Mulching ; Full ; sun grown coffee ; Soil carbon and nitrogen ; Carbon sequestration ; Leucaena ; KX2 ; Surface ; soil CO2 efflux
• 刊名：Agroforestry Systems
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：90
• 期：2
• 页码：325-337
• 全文大小：732 KB
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• 作者单位：Adel H. Youkhana (1)
  Travis W. Idol (1)
  
  1. Department of Natural Resources and Environmental Management, University of Hawaii at Manoa, 1910 East-West Rd, Sherman Lab 101, Honolulu, HI, 96822, USA
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Forestry
  Agriculture
  
• 出版者：Springer Netherlands
• ISSN：1572-9680

文摘

One option to sustain full-sun coffee plantation is the use of a “cut-and-carry” system in which a stand of N-fixing trees is grown outside the coffee field and utilized as a source of mulch to capture the benefits of organic matter, nutrient additions, and continuous soil cover. The objectives of this study were to evaluate the potential of a cut-and-carry system of mulch additions from a multipurpose N-fixing tree for open-grown coffee in Hawaii to support high crop yield as well as improved soil organic matter and nitrogen. A stand of Leucaena variety KX2 trees were pollarded every 6 months, and the pollarded material was chipped and added to open-grown coffee plots. Approximately 65 Mg ha−1 of mulch dry matter was added over a 3-year period, including ~27.5 Mg ha−1 of C and ~530 kg ha−1 of total N. Plots without mulch addition were fertilized with equivalent amounts of inorganic N for comparison. Mulch decomposition averaged 64 % (weight basis) over the first year and followed first-order decay dynamics. Net N mineralization was positive by 3 months after addition. There was significant loss of all major biochemical components during the decomposition process. Mulching increased soil CO₂ efflux by 2.89 Mg ha−1. Total soil C and N increased by 2.90 and 1.42 Mg ha−1, respectively. Mulch addition significantly increased all measures of coffee growth and yield over 2 years, except for average bean weight. Where space is available or shade is undesirable, a cut-and-carry mulching system using Leucaena-KX2 can increase soil C and N and achieve coffee yields similar to or greater than other full-sun systems.