引用本文：

张文明，邱慧珍，刘星，张俊莲，王蒂.连作对马铃薯根系形态及吸收能力的影响[J].大中文模板3,2014,(1):34-37. [点击复制]
ZHANG Wen-ming， QIU Hui-zhen， LIU Xing， ZHANG Jun-lian， Wang Di.Effects of continuous cropping on morphology characteristics and absorptive capacity of potato root[J].大中文模板3,2014,(1):34-37. [点击复制]

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连作对马铃薯根系形态及吸收能力的影响
张文明^1,2，邱慧珍^1,2，刘星^1,2，张俊莲^2,3,4，王蒂^2,3,4
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(（1.甘肃农业大学资源与环境学院，甘肃兰州 730070; 2.甘肃省干旱生境作物学重点实验室，甘肃兰州 730070; 3.甘肃农业大学农学院，甘肃兰州 730070; 4.甘肃省作物遗传改良与种质创新重点实验室，甘肃兰州 730070）)

摘要:

研究了不同连作年限对马铃薯根系形态和养分吸收能力的影响。结果表明，连作降低了马铃薯根系活力、活跃吸收面积和总吸收面积，连作3年、4年和5年的根系活力比轮作分别下降了53.71%、66.84%和66.69%，活跃吸收面积分别下降了57.6%、75.7%和75.6%，总吸收面积分别下降了51.4%、67.9%和67.6%；连作明显增加了0～0.5 mm和0.5～1.0 mm直径范围内的总根长、表面积、根体积和根尖数，连作3年、4年和5年在0～0.5 mm直径范围内的总根长和根尖数比轮作分别显著增加了24.9%、35.0%、35.4%和13.4%、21.0%、23.1%；连作1年和2年地块的块茎产量差异不显著，但连作3年后块茎产量较轮作下降了45%以上。由此可见，在当地生态环境和栽培及品种条件下连作的阈值年限可能为2年，马铃薯根系吸收能力的下降是导致产量下降的主要原因之一，根系生长增加是马铃薯应对连作逆境的主动性适应机制。

关键词: 马铃薯连作根系形态吸收能力

DOI：

基金项目:公益性行业（农业）科研专项（200803031，201103004）；国家马铃薯产业技术体系（CARS-10-P18）和甘肃省科技重大专项（1102NKDA025）资助

Effects of continuous cropping on morphology characteristics and absorptive capacity of potato root

ZHANG Wen-ming^1,2， QIU Hui-zhen^1,2， LIU Xing^1,2， ZHANG Jun-lian^2,3,4， Wang Di^2,3,4

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Abstract:

A field experiment was conducted to understand the mechanism underlying the reduction in potato yield under continuous cropping. The results showed that the activity of root system, root active absorption area, and total root absorption area were reduced as the continuous cropping year inc reased. Compared with rotation cropping, the activity of root system under continuous cropping for 3, 4, and 5 years decreased by 53.71%, 66.84%, and 66.69%, respectively, and similarly the root active absorbing by 57.6%, 75.7%, and 75.6%, and the total root absorbing by 51.4%, 67.9%, and 67.6%. The total root length, root surface area, root volume, and root tip number in root diameter of 0～0.5 mm and 0.5～1.0 mm obviously increased under continuous cropping. The tuber yield was no significantly different between 1 year and 2 years of continuous cropping, while it decreased by more than 45% compared with rotation cropping for 3 years of continuous cropping. It is thus suggested that the threshold of potato continuous cropping be no more than 2 years in the target area. In addition, the reduction in nutrient absorptive capacity and the increase in root growth increase were responsible for the yield loss of potato under continuous cropping.

Key words: potato continuous cropping root morphology absorptive capacity