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首页> 外文期刊>The Science of the Total Environment >Drought responses of profile plant-available water and fine-root distributions in apple (Malus pumila Mill.) orchards in a loessial, semi-arid, hilly area of China
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Drought responses of profile plant-available water and fine-root distributions in apple (Malus pumila Mill.) orchards in a loessial, semi-arid, hilly area of China

机译：苹果（Malus Pumila Mill。）苹果（Malus Pumila Mill.）果园在中国丘陵地区的果园（Malus Pumila Mill）的普通植物和细根分布的干旱反应

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摘要

The number of apple (Malus pumila Mill.) orchards has increased substantially in hilly regions of the Loess Plateau of China, as a significant element of the large-scale 'Grain for Green' ecological rehabilitation program that aims to conserve soil and water while improving the regions economic prospects. However, the long-term effects of the orchard expansion and the adaptive responses of apple trees to drought are not known. Thus, using a space-for-time substitution approach, we investigated plant-available water and fine-root distribution in the 0-8 m soil profile in apple orchards of various ages in a dry year (2015,392 mm rainfall) and the following year with normal precipitation (2016,500 mm rainfall). We found that plant-available water gradually decreased with stand age in the dry year, but increased in the normal year, especially in the 0-2 m soil layer. Fine root (＜2 mm diameter) distribution and biomass increased with stand age and decreased with increasing soil depth in all treatment plots, predominantly in the 0-2 m layer. In all treatment plots, most of the soil layers in the deep soil (＞2 m) had soil moisture storage deficit. In the dry year (2015), the apple trees increased both the average depth (D_(50) and D_(95) values) and biomass of their fine-root systems in response to water stress, relative to the normal year (2016). Thus, the apple trees extracted water primarily from the shallow (＜2 m) layers in the normal year, but from deeper soil layers in the dry year, to sustain growth. The results of this study will help to guide land and agricultural water management in rainfed apple orchards in hilly regions of the Loess Plateau and similar dryland regions.
机译：苹果（Malus Pumila Mill。）果园的数量大幅增加了中国黄土高原的丘陵地区，是绿色“生态康复计划的大规模”粮食“的重要因素，旨在在改善时保护土壤和水地区经济前景。然而，果园扩张的长期效应和苹果树对干旱的适应性反应尚不清楚。因此，使用换空时间替代方法，我们在苹果园在旱十年（2015,392毫米降雨）和植物果园的0-8米土壤剖面中调查了植物可用的水和细根分布。追随普通降水（2016,500毫米降雨）。我们发现植物可用的水随着干旱年龄的立场逐渐减少，但在正常年份增加，特别是在0-2米的土层中。细根（直径直径）分布和生物质随着站立年龄的增加，并且随着所有治疗图中的土壤深度增加而降低，主要在0-2M层中。在所有治疗图中，深土（> 2米）中的大部分土壤层都有土壤水分储存缺陷。在干燥的年份（2015年）中，苹果树增加了与水分压力相比其细根系统的平均深度（D_（50）和D_（95）值）和生物量，相对于正常年份（2016） 。因此，苹果树在正常年份主要从浅（<2米）层中提取水，但是从干燥的年度较深的土壤层，以维持增长。本研究的结果将有助于导航黄土高原丘陵地区雨水园区的土地和农业水资源管理和类似的旱地地区。

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  • 来源
    《The Science of the Total Environment》 |2020年第25期|137739.1-137739.11|共11页
  • 作者

    Xiaolin Song; Xiaodong Gao; Pute Wu; Xining Zhao; Wei Zhang; Yufeng Zou; Kadambot H.M. Siddique;

  • 作者单位

    College of Mechanical and Electronic Engineering Northwest A&F University Yangling Shaanxi 712100 China Institute of Water Saving Agriculture in Arid Areas of China Northwest A&f University Yangling Shaanxi 712100 China National Engineering Research Center for Water Saving Irrigation at Yangling Yangling Shaanxi 712100 China;

    Institute of Water Saving Agriculture in Arid Areas of China Northwest A&f University Yangling Shaanxi 712100 China National Engineering Research Center for Water Saving Irrigation at Yangling Yangling Shaanxi 712100 China Institute of Soil and Water Conservation Northwest A&f University Yangling Shaanxi 712100 China;

    College of Mechanical and Electronic Engineering Northwest A&F University Yangling Shaanxi 712100 China Institute of Water Saving Agriculture in Arid Areas of China Northwest A&f University Yangling Shaanxi 712100 China National Engineering Research Center for Water Saving Irrigation at Yangling Yangling Shaanxi 712100 China Institute of Soil and Water Conservation Northwest A&f University Yangling Shaanxi 712100 China;

    Institute of Water Saving Agriculture in Arid Areas of China Northwest A&f University Yangling Shaanxi 712100 China National Engineering Research Center for Water Saving Irrigation at Yangling Yangling Shaanxi 712100 China Institute of Soil and Water Conservation Northwest A&f University Yangling Shaanxi 712100 China;

    Institute of Water Saving Agriculture in Arid Areas of China Northwest A&f University Yangling Shaanxi 712100 China National Engineering Research Center for Water Saving Irrigation at Yangling Yangling Shaanxi 712100 China Institute of Water Conservancy and Architectural Engineering Northwest A&f University Yangling 712100 China;

    Institute of Water Saving Agriculture in Arid Areas of China Northwest A&f University Yangling Shaanxi 712100 China;

    The UWA Institute of Agriculture The University of Western Australia Perth WA 6009 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Plant-available water; Soil moisture storage deficit; Apple orchards Stand age; Management; Loess plateau;

    机译：植物供水;土壤水分储存赤字;苹果园立场;管理;黄土高原;

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