果园土壤中鼠茅草的降解特性及其对氮素供应的影响

doi:10.11686/cyxb2015201

草业学报 ›› 2016, Vol. 25 ›› Issue (3): 245-250.DOI: 10.11686/cyxb2015201

果园土壤中鼠茅草的降解特性及其对氮素供应的影响

梁斌¹, 董静², 隋方功¹, 刘庆花¹, 李俊良^{1, *}

1.青岛农业大学资源与环境学院,山东青岛 266109;
2.寿光市农业局,山东寿光 262700

收稿日期:2015-04-17 出版日期:2016-03-20 发布日期:2016-03-20
通讯作者: E-mail:jlli1962@163.com
作者简介:梁斌(1983-),男,山东昌乐人,博士.E-mail:liangbin306@163.com
基金资助:
山东省自然科学基金(ZR2013DQ014)和公益性行业(农业)科研专项项目(201103005)资助

Decomposition characteristics of a Vulpia myuros cover crop in an orchard soil and its effect on N supply

LIANG Bin¹, DONG Jing², SUI Fang-Gong¹, LIU Qing-Hua¹, LI Jun-Liang^{1, *}

1.Collage of Resources and Environment, Qingdao Agriculture University, Qingdao 266109, China;
2.Shouguang Agricultural Bureau, Shouguang 262700, China

Received:2015-04-17 Online:2016-03-20 Published:2016-03-20

摘要/Abstract

摘要： 果园生草提高土壤肥力,减少水土流失,具有良好的生态环境效益.但生草对土壤氮素的供应影响是果农关注的问题之一.本研究通过室内培养试验,研究了不同时期采集的果园生草作物(鼠茅草)的降解特性及其对氮素固持的影响.结果表明,鼠茅草枯萎后,地上部易降解有机碳占51%,鼠茅草难降解部分残留在土壤当中每年增加1 t/hm²的土壤碳固持;施氮肥加快鼠茅草的降解,同时增加其稳定有机碳的相对含量,对土壤固碳量影响不大;鼠茅草枯萎还田后对土壤氮素的固持量为39~65 mg/kg,因此在中低肥力土壤施肥时应适当地补充60~100 kg/hm²氮素,避免微生物和果树争肥,同时提高土壤肥力.

Abstract: Cover cropping in orchard is an efficient soil management technique for improving soil fertility and reducing soil erosion. However, the effect of cover crops on nutrient supply is not well understood and a concern for growers. An experiment was conducted to investigate the decomposition characteristics of a cover crop (Vulpia myuros) and its effect on N supply in orchard soil. The decomposable organic C in straw of V. myuros accounted for 51% of organic C; the remainder increased soil C sequestration by 1 t/ha per year. Application of exogenous N fertilizer had no effect on annual net C sequestration, although it increased the decomposition rate of V. myuros straw. During decomposition, immobilized N ranged from 39-65 mg/kg. Consequently an additional 60-100 kg N/ha should be applied during V. myuros decomposition in low fertility soils in the first few years to avoid competition between soil microbes and crop trees, and to improve soil fertility.

梁斌, 董静, 隋方功, 刘庆花, 李俊良. 果园土壤中鼠茅草的降解特性及其对氮素供应的影响[J]. 草业学报, 2016, 25(3): 245-250.

LIANG Bin, DONG Jing, SUI Fang-Gong, LIU Qing-Hua, LI Jun-Liang. Decomposition characteristics of a Vulpia myuros cover crop in an orchard soil and its effect on N supply[J]. Acta Prataculturae Sinica, 2016, 25(3): 245-250.

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果园土壤中鼠茅草的降解特性及其对氮素供应的影响

Decomposition characteristics of a Vulpia myuros cover crop in an orchard soil and its effect on N supply

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