Characteristics of Switchgrass Root Distribution under Different Row Spacings in Loess Hilly-gully Region of China

doi:10.11733/j.issn.1007-0435.2017.06.014

Acta Agrestia Sinica ›› 2017, Vol. 25 ›› Issue (6): 1251-1257.DOI: 10.11733/j.issn.1007-0435.2017.06.014

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Characteristics of Switchgrass Root Distribution under Different Row Spacings in Loess Hilly-gully Region of China

AN Qin-qin^1,3, GAO Zhi-juan², LIU Jin-biao², WANG Zhi^1,2, XU Bing-cheng^1,2

1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi Province 712100, China;
2. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi Province 712100, China;
3. University of Chinese Academy of Sciences, Beijing 100039, China

Received:2017-06-21 Revised:2017-09-19 Online:2017-12-15 Published:2018-03-30

黄土丘陵区不同种植行距下柳枝稷根系分布特征研究

安勤勤^1,3, 高志娟², 刘金彪², 王智^1,2, 徐炳成^1,2

1. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌 712100;
2. 西北农林科技大学水土保持研究所, 陕西杨凌 712100;
3. 中国科学院大学, 北京 100039

通讯作者: 徐炳成,E-mail:Bcxu@ms.iswc.ac.cn
作者简介:安勤勤(1992-),女,陕西榆林人,硕士研究生,主要从事草地生态研究,E-mail:anqinqin@foxmail.com
基金资助:
国家自然科学基金（41371509）；国家重点研发计划项目（2016YFC0501703）资助

Abstract

Abstract:

To know the relationship between root growth and row spacing can offer evidence for choosing rational crop density in dry region. The roots of switchgrass (Pancium virgatum L.) were sampled down to 150 cm deepth using soil core method under different row spacings in April and October, 2016. The measurements were conducted on a terrace field under three row spacings (20 cm, 40 cm and 60 cm, respectively) after switchgrass has grown for 6 years in semiarid loess hilly-gully region. Results showed that root biomass of switchgrass mainly distributed in the 0~40 cm soil profile. In the 0~20 cm soil profile, root biomass decreased as the row spacing enlarged and root biomass under 60 cm was significantly higher than that under 20 cm and 40 cm row spacing (P<0.05). In the 40~150 cm soil profile, the root biomass and root length density were the smallest under 20 cm row spacing. Root biomass upon or between rows increased as row spacing enlarged. Root length density upon the row increased with increasing row spacing in April, and the highest root length density under 40 cm row spacing appeared in October. Under 40 cm row spacing, the root length density between rows showed the highest value in both months. Row spacing affected root length density of fine roots (d ≤ 0.5 mm) significantly (P<0.05), and it was the biggest and smallest under 40 cm and 20 cm row spacing, respectively. Our results showed that higher root biomass production and the biggest averaged root and fine root (d ≤ 0.5 mm) length density were obtained under 40 cm row spacing, which would be the appropriate row spacing for planting switchgrass in the region.

Key words: Switchgrass, Row spacing, Root biomass, Root length density, Root distribution

摘要：

明确旱区作物根系生长与行距的关系可为合理选择种植密度提供依据。以梯田种植第7年的柳枝稷（Pancium virgatum L.）草地为研究对象，采用根钻法于2016年4月和10月对0~150 cm土层进行根系取样，比较研究了3种种植行距下（20 cm，40 cm和60 cm）柳枝稷根系生物量和根长密度分布特征。结果表明：柳枝稷根系主要分布在0~40 cm土层，20 cm和40 cm行距下0~20 cm土层根系生物量显著高于60 cm行距（P<0.05）；在40~150 cm土层，根系生物量和根长密度在20 cm行距下最低。行上与行间根系生物量均随种植行距增大而增大，均以40 cm行距下根长密度较高。细根（d≤0.5 mm）根长密度为40 cm行距下显著最高，20 cm行距下最低（P<0.05）。总体表明，40 cm行距下柳枝稷根系生物量较高，平均根长密度与细根根长密度最高。

关键词: 柳枝稷, 种植行距, 根系生物量, 根长密度, 根系分布

CLC Number:

S543

AN Qin-qin, GAO Zhi-juan, LIU Jin-biao, WANG Zhi, XU Bing-cheng. Characteristics of Switchgrass Root Distribution under Different Row Spacings in Loess Hilly-gully Region of China[J]. Acta Agrestia Sinica, 2017, 25(6): 1251-1257.

安勤勤, 高志娟, 刘金彪, 王智, 徐炳成. 黄土丘陵区不同种植行距下柳枝稷根系分布特征研究[J]. 草地学报, 2017, 25(6): 1251-1257.

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Characteristics of Switchgrass Root Distribution under Different Row Spacings in Loess Hilly-gully Region of China

黄土丘陵区不同种植行距下柳枝稷根系分布特征研究

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