The role of complementarity and selection effects in P acquisition of intercropping systems
The role of complementarity and selection effects in P acquisition of intercropping systems
复制标题
间作系统磷获取中互补性和选择效应的作用
DOI：
10.1007/s11104-017-3487-3
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发表时间：
2018-01-01
期刊：
影响因子：
4.9
通讯作者：
Li, Long
中科院分区：
文献类型：
--
作者：
Li, Xiao-Fei;Wang, Cheng-Bao;Li, Long
通过间作提高作物生产力通常被认为是由资源互补性驱动的。然而，相对较少的研究直接测量资源获取来评估间作增产的潜在机制。采用3种磷肥施用水平（0、40、80 kg P / h(-1) /年）和4种玉米间作制度，连续3年对磷肥获取和磷肥回收效率（PRE）进行了评价。采用加性分配法研究了间作磷素获取的互补性（CE）和选择效应（SE）。与单作相比，蚕豆/玉米间作和鹰嘴豆/玉米间作的平均磷获取量分别增加了28.4%和27.6%。然而，去年大豆/玉米间作和油菜/玉米间作对磷的吸收普遍没有增加，甚至有所减少。蚕豆/玉米的CE和鹰嘴豆/玉米间作的CE和SE均呈阳性，增加了磷的吸收。通过CE和/或SE获取资源的增加取决于间作系统中特定的作物组合。将加性分配方法应用于间作，可以帮助确定过量生产的潜在机制，并仔细选择作物组合，以实现更有效的资源利用。
Enhanced crop productivity by intercropping is commonly assumed to be driven by resource complementarity. However, relatively few studies have directly measured resource acquisition to assess potential mechanisms underlying enhanced performance of intercropping.A long-term field experiment with three P application rates (0, 40, 80 kg P ha(-1) yr.(-1)) and four maize-based intercropping systems was used to assess P acquisition and P fertilizer recovery efficiency (PRE) for three consecutive years. To identify underlying mechanisms, the additive partitioning method was applied to determine complementarity (CE) and selection effects (SE) in P acquisition of intercropping.Average P acquisition increased by 28.4% and 27.6% compared to their monocultures in faba bean/maize and chickpea/maize intercropping, respectively. However, P acquisition was generally not enhanced and even reduced in the last year in soybean/maize and oilseed rape/maize intercropping. Enhanced P acquisition was due to positive CE in faba bean/maize, and to positive CE and SE in chickpea/maize intercropping.Increased resource acquisition via CE and/or SE depended on the particular crop combination in intercropping systems. Application of the additive partitioning method to intercropping may help to identify underlying mechanisms of overyielding and carefully select crop combinations to enable more efficient resource use.