Spatial distribution and dynamics of cotton fine root under film-mulched drip irrigation
Spatial distribution and dynamics of cotton fine root under film-mulched drip irrigation
复制标题
膜下滴灌棉花细根空间分布及动态
DOI：
10.1016/j.indcrop.2022.114693
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发表时间：
2022-02-23
影响因子：
5.9
通讯作者：
Ferre, Ty P. A.
中科院分区：
文献类型：
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作者：
Chen, Wenling;Chen, Feifei;Ferre, Ty P. A.
细根分布和动态（产量、死亡率和寿命）显着影响作物土壤生态系统。然而，膜膜滴灌下棉花（Gossypium hirsutum L.）细根的空间分布和动态知之甚少。本研究旨在描述使用微型根管技术测量的这些分布和动态以及土壤条件的影响。土壤水分和盐分分布的不均匀可能导致根长密度（RLD）分布的差异。由于苦咸水灌溉后局部盐分积累较高，浅层土层的平均 RLD 呈明显下降趋势。深层存在明显的高土壤含水量带，这可能导致95-100 cm土层出现较高的RLD峰值。平均活根产量的特点是在初始生长阶段非常高，随后在出芽后下降，而在吐絮期间又略有增加。平均新根数在生长初期最高，在现蕾期后逐渐减少。深层土壤中较细的根系比浅层土壤中的根系寿命更短。我们的研究表明，微根管技术可以作为一种可靠的原位、无损方法来估计覆膜滴灌下棉花细根的分布和动态。为了更准确地评估覆膜滴灌下棉花细根的分布和动态，可以基于微根管观测对棉花根系结构模型进行空间和时间参数化。
Fine roots distribution and dynamics (production, mortality, and longevity) significantly impact the crop soil ecosystems. However, the spatial distribution and dynamics of cotton (Gossypium hirsutum L.) fine roots under film-mulched drip irrigation are poorly understood. The present study aims to characterize these distributions and dynamics measured using a minirhizotron technique and the influence of soil conditions. The non-uniform distribution of soil moisture and salinity may lead to the differences of root length density (RLD) distribution. A clear decreased trend for the average RLD was observed in the shallow soil layer due to high localized salinity accumulated after brackish water irrigation. There existed a clear high soil moisture content strip at depth which may lead to a high RLD peak in the 95-100 cm soil layer. Average live root production was characterized by a very high rate during the initial growth stage followed by a decline after budding, which in turn was followed by a slight increase during boll opening. The average number of new roots was highest during the initial growth stages, decreasing after the budding stage. Thinner roots in the deep soil had shorter lifespans than those in shallow soil. Our study indicated that the minirhizotron technique can be used reliably as an in situ, nondestructive method for estimating cotton fine roots distribution and dynamics under film-mulched drip irrigation. To evaluate cotton fine root distribution and dynamics under film-mulched drip irrigation more accurately, a cotton root system architecture model could be parameterized in space and time based on the minirhizotron observations.