...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Agriculture, Ecosystems & Environment: An International Journal for Scientific Research on the Relationship of Agriculture and Food Production to the Biosphere >The conversion of overgrazed pastures to almond orchards and alfalfa cropping systems may favor microbial indicators of soil quality in Central Iran.
【24h】

The conversion of overgrazed pastures to almond orchards and alfalfa cropping systems may favor microbial indicators of soil quality in Central Iran.

机译：过度放牧的牧场向杏仁园和苜蓿种植系统的转化可能有利于伊朗中部土壤质量的微生物指标。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Land use changes may have a major influence on soil quality that is important in sustaining ecosystem productivity. Yet, the effects of these changes on soil quality are not well understood, particularly in poor heterogeneous pastures overgrazed by sheep. The aim of this study was to determine the short-term response of soil quality indicators to changes in land use from permanent pastures overgrazed to almond orchards and then to alfalfa cropping systems occurring in Saman plain, Central Iran. Soil quality indicators were evaluated in four land use systems including permanent pastures (PP) overgrazed by sheep, pastures converted to almond orchards (AO) for more than 45 years, almond orchards converted to alfalfa fields for 5 years (FA) and almond orchards converted to alfalfa fields for 2 years (TA). Composite soil samples from each of the four random replicates of the land use systems were sampled to a depth of 30 cm, and analysed for soil bulk density, total N, total organic C, wet aggregate stability, C mineralization, microbial biomass C, and phosphatase activities. Land use changes (i.e. conversion of pastures to almond orchards and then to alfalfa fields) resulted in significant increases in soil bulk density, and total organic C and N contents. Similarly, total organic C and N pools were far greater in TA and FA compared to PP and AO land use systems. The soil porosity and aggregate stability (MWD) in PP and AO land use systems were significantly greater than those in TA and FA land use systems. Carbon mineralization and microbial biomass C and the activity of acid and alkaline phosphatases were substantially higher in the alfalfa fields than those in overgrazed pastures and almond orchards. The microbial metabolic quotient (qCO2) increased in alfalfa fields, although the increases were marginal. It would appear that (1) the conversion of poor pastures to alfalfa cropping systems favors soil microbial properties, (2) microbial properties are the most sensitive soil quality indicators responding positively to short-term changes in land use. It is also concluded that improvement in soil quality and enhanced biological activity in alfalfa fields demonstrated the gradual resilience of the poor and overgrazed pastures once converted to a fast growing and N2 fixing legume crop..
机译：土地用途的变化可能会对土壤质量产生重大影响，这对于维持生态系统生产力至关重要。然而，人们对这些变化对土壤质量的影响知之甚少，尤其是在绵羊过度放牧的贫瘠异质草场中。这项研究的目的是确定土壤质量指标对土地利用变化的短期响应，从过度放牧的永久牧场到杏仁果园，再到伊朗中部萨满平原的苜蓿种植系统。在四个土地利用系统中对土壤质量指标进行了评估，其中包括绵羊过度放牧的永久性牧场（PP），牧场转化成杏仁园（AO）超过45年，杏仁园转化成苜蓿田5年（FA）和杏仁园转化的土地到苜蓿田2年（TA）。从土地利用系统的四个随机重复样本中的每个样本中提取复合土壤样本，采样深度为30 cm，并分析土壤容重，总氮，总有机碳，湿集料稳定性，碳矿化度，微生物生物量碳和磷酸酶活性。土地用途的变化（即从牧场转变为杏仁园，然后再转变为苜蓿田地）导致土壤容重和有机碳和氮总含量的显着增加。同样，与PP和AO土地利用系统相比，TA和FA中的总有机碳和氮库要大得多。 PP和AO土地利用系统中的土壤孔隙度和聚集体稳定性（MWD）显着大于TA和FA土地利用系统中的土壤孔隙度和聚集体稳定性。苜蓿田中的碳矿化和微生物生物量C以及酸性和碱性磷酸酶的活性要比过度放牧的牧场和杏仁园中的高得多。苜蓿田中的微生物代谢商（qCO2）增加，尽管增加幅度很小。看来（1）贫瘠的牧场向苜蓿种植系统的转化有利于土壤微生物特性，（2）微生物特性是对土地利用的短期变化产生积极响应的最敏感的土壤质量指标。得出的结论是，苜蓿田土壤质量的改善和生物活性的增强表明，一旦贫瘠和过度放牧的草场转变为能快速生长和固氮的豆类作物，草场便会逐渐恢复。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号