首页> 外文期刊>Agroforestry Systems >Determinants of grassland primary production in seasonally-dry silvopastoral systems in Central America
【24h】

Determinants of grassland primary production in seasonally-dry silvopastoral systems in Central America

机译:中美洲季节性干旱牧草牧系统中草地初级生产的决定因素

获取原文
获取原文并翻译 | 示例
       

摘要

Grassland primary productivity is the function that underpins the majority of the fodder production in cattle-rearing silvopastoral farms. Hence, understanding the factors that determine grassland productivity is critical for the design and management of silvpastoral systems. We studied the effect of two factors with documented impact on grassland productivity in seasonally dry silvopastures of Nicaragua, rainfall and trees. We assessed the effects of three species that differed in crown size and phenology, one evergreen, Cassia grandis, and two deciduous species, Guazuma ulmifolia and Tabebuia rosea. Overall, grassland ANPP had a quadratic response to rainfall, with a decline at high rainfall that coincided with peak standing biomass and grassland cover. Trees had a predominately negative effect on grassland productivity, and the effect was concentrated in the rainy season at peak productivity. The effect of the trees corresponded with the tree crown area, but not with crown density. Trees reduced the standing biomass of graminoids and increased forb biomass; thus, the effect of trees on grassland ANPP appears in part to respond to changes in grassland composition. We also found higher levels of soil moisture content below the tree canopy, particularly at the peak of the rainy season when soils tend to become waterlogged. The evergreen species, C. grandis, affected grassland ANPP more strongly than the deciduous species
机译:草原的初级生产力是支撑牧牛场的大部分饲料生产的功能。因此,了解决定草地生产力的因素对于林牧系统的设计和管理至关重要。我们研究了尼加拉瓜季节性干旱林牧区,降雨和树木对草原生产力产生影响的两个因素的影响。我们评估了三种在树冠大小和物候上不同的物种的影响,一种是常绿的决明子,另一种是落叶的物种Guazuma ulmifolia和Tabebuia rosea。总体而言,草地ANPP对降雨有二次响应,高降雨时下降,这与峰​​值生物量和草地覆盖率相吻合。树木对草地生产力产生主要的负面影响,这种影响集中在雨季,生产力达到峰值。树木的效果与树冠面积相对应,但与树冠密度不符。树木减少了类固醇的立足生物量,并增加了无用生物量。因此,树木对草地ANPP的影响部分出现是对草地成分变化的响应。我们还发现树冠下的土壤水分含量较高,尤其是在雨季高峰期(土壤趋于涝渍时)。常绿树种C. grandis对草原ANPP的影响大于落叶树种

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