Diversity increases yield but reduces harvest index in crop mixtures

doi:10.1038/s41477-021-00948-4

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	Diversity increases yield but reduces harvest index in crop mixtures
	Chen,Jianguo ; Engbersen,Nadine ; Stefan,Laura ; Schmid,Bernhard ; Sun,Hang; Schob,Christian
	2021
发表期刊	NATURE PLANTS
ISSN	2055-026X
卷号	7 期号:7 页码:893+
摘要	Resource allocation to reproduction is a critical trait for plant fitness(1,2). This trait, called harvest index in the agricultural context(3-5), determines how plant biomass is converted to seed yield and consequently financial revenue from numerous major staple crops. While plant diversity has been demonstrated to increase plant biomass(6-8), plant diversity effects on seed yield of crops are ambiguous(9) and dependent on the production syndrome(10). This discrepancy might be explained through changes in the proportion of resources invested in reproduction in response to changes in plant diversity, namely through changes in species interactions and microenvironmental conditions(11-14). Here, we show that increasing crop plant diversity from monocultures over two- to four-species mixtures increased annual primary productivity, resulting in overall higher plant biomass and, to a lesser extent, higher seed yield in mixtures compared with monocultures. The difference between the two responses to diversity was due to a reduced harvest index of the eight tested crop species in mixtures, possibly because their common cultivars have been bred for maximum performance in monoculture. While crop diversification provides a sustainable measure of agricultural intensification(15), the use of currently available cultivars may compromise larger gains in seed yield. We therefore advocate regional breeding programmes for crop varieties to be used in mixtures that should exploit complementarity(16) among crop species.
关键词	REPRODUCTIVE ALLOCATION PLANT DIVERSITY FUNCTIONAL TRAITS PRODUCTIVITY PLASTICITY ALLOMETRY COMPLEMENTARITY VARIABILITY MAIZE LONG
DOI	10.1038/s41477-021-00948-4
WOS记录号	WOS:000665728100002
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/73740
专题	中国科学院昆明植物研究所
作者单位	1.Swiss Fed Inst Technol, Inst Agr Sci, Zurich, Switzerland 2.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming, Yunnan, Peoples R China 3.Univ Zurich, Dept Geog, Remote Sensing Labs, Zurich, Switzerland 4.Peking Univ, Inst Ecol, Coll Urban & Environm Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Chen,Jianguo,Engbersen,Nadine,Stefan,Laura,et al. Diversity increases yield but reduces harvest index in crop mixtures[J]. NATURE PLANTS,2021,7(7):893+.
APA	Chen,Jianguo,Engbersen,Nadine,Stefan,Laura,Schmid,Bernhard,Sun,Hang,&Schob,Christian.(2021).Diversity increases yield but reduces harvest index in crop mixtures.NATURE PLANTS,7(7),893+.
MLA	Chen,Jianguo,et al."Diversity increases yield but reduces harvest index in crop mixtures".NATURE PLANTS 7.7(2021):893+.

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