Film mulching affects root growth and function in dryland maize-soybean intercropping

doi:10.1016/j.fcr.2021.108240

	Film mulching affects root growth and function in dryland maize-soybean intercropping
	Zhang, Wei 1,2; Li, Shiqing 1,3; Shen, Yufang 1,3; Yue, Shanchao 1,3
刊名	FIELD CROPS RESEARCH
	2021-09-15
卷号	271 页码:15
关键词	Root morphology Intercropping Film mulching Root-shoot synergy Overyielding
ISSN号	0378-4290
DOI	10.1016/j.fcr.2021.108240
通讯作者	Li, Shiqing(sqli@ms.iswc.ac.cn)
英文摘要	Understanding the morphological response of maize roots in the presence of soybeans in fields under varied water conditions is vital for identifying maize-dominant intercropping systems suitable for climate change. In this study, two maize-soybean intercropping systems (maize with and without film mulching) were compared with maize and soybean sole crops in rainfed farmland on the Loess Plateau. Different features, including the maize root morphological traits, root vertical distribution, shoot traits, interspecific root overlap, and grain yield of intercrops, were determined after silking in 2017 (dry year) and 2018 (wet year). The intercropped maize (without film mulching) employed a thin root system under dry conditions and a profuse root system under wet conditions, with shallow roots and active root-diameter strategy to adapt to varied water conditions. These features resulted in higher grain yield in per unit area for the intercropped maize (16.97 % overyielding) than sole maize without film mulching. Film mulching of intercropped maize modified the roots with confined growth under dry conditions and inhibited the roots with excessive growth under wet conditions; as a consequence, the two morphologies of intercropped maize root system were reshaped into the optimal one (less profuse but not thin), with S-type vertical distribution (1 m soil profile) for root length and more beneficial root-diameter strategy. Besides, film mulching improved interspecific root interaction through an evident increase in root length or mass in the interspecific overlap regions. Finally, film mulching improved the maize overyielding dramatically (84 %) due to high leaf adaptability and efficient root-shoot synergy in maize plants. Importantly, the maize mulching did not decrease intercropped soybean yield significantly when compared with sole soybean due to the benefits from interspecific facilitation, while it enhanced total grain yield (10.67 %) for the inter cropping system. Thus, film mulching improved maize root morphology and balanced soil resource exploitation and shoot development, consequently strengthening the attainable grain yield in the intercropping system. To conclude, the research elucidates the plant root mechanisms (root morphological changes) underlying over yielding of intercropped maize in varied water conditions. It identifies film mulching of maize as a strategy to optimize root growth and function for higher intercropping yield advantage in dryland.
资助项目	National Natural Science Foundation of China[42077102] ; National Key R&D Program of China[2017YFD0201807]
WOS关键词	WATER ; NITROGEN ; YIELD ; BIOMASS ; SYSTEMS ; CROPS ; FACILITATION ; COMPETITION ; DIAMETER ; PATTERNS
WOS研究方向	Agriculture
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000687829200001
资助机构	National Natural Science Foundation of China ; National Key R&D Program of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/164986]
专题	中国科学院地理科学与资源研究所
通讯作者	Li, Shiqing
作者单位	1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100000, Peoples R China 3.Northwest A&F Univ, Coll Resource & Environm, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Wei,Li, Shiqing,Shen, Yufang,et al. Film mulching affects root growth and function in dryland maize-soybean intercropping[J]. FIELD CROPS RESEARCH,2021,271:15.
APA	Zhang, Wei,Li, Shiqing,Shen, Yufang,&Yue, Shanchao.(2021).Film mulching affects root growth and function in dryland maize-soybean intercropping.FIELD CROPS RESEARCH,271,15.
MLA	Zhang, Wei,et al."Film mulching affects root growth and function in dryland maize-soybean intercropping".FIELD CROPS RESEARCH 271(2021):15.