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HOW MULTISPECIES intercrop ADVANTAGE RESPONDS TO WATER STRESS:A YIELDCOMPONENT ECOLOGICAL FRAMEWORK AND ITS EXPERIMENTAL APPLICATION

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Frontiers of Agricultural Science and Engineering 2021年第3期8卷 416-431页

作者： Luis GARCIA-BARRIOS Yanus A.DECHNIK-VAZQUEZ The South Frontier College Panamerican and South Peripheric Avenues(w/o number)San Cristobal de las CasasChiapas 29290Mexico Pre-Planning Center of the Gulf Federal Electricity ComissionDiego de Ordaz 593Boca del RioVeracruz 94295Mexico

Absolute yield and land use efficiency can be higher in *** this phenomenon is common,it is not always the ***,these two benefits are frequently confused and do not necessarily occur *** choices become more complex when considering that multicrops are subject to strong spatial and temporal variation in average soil moisture,which will worsen with climate *** in agroecosystems is expected to buffer this impact by favoring resistance to reduced humidity,but there are few empirical/experimental studies to validate this *** is not clear if relatively higher multicrop yield and land use efficiency will persist in the face of reduced soil moisture,and how the relation between these benefits might ***,we present a relatively simple framework for analyzing this *** propose a relative multicrop resistance(RMR)index that captures all possible scenarios of absolute and relative multicrop overyield under water *** dissect the ecological components of RMR to understand the relation between higher multicrop yield and land use efficiency and the ecological causes of different overyield *** demonstrate the use of this framework with data from a 128 microplot greenhouse experiment with small annual crops,arranged as seven-species multicrops and their corresponding monocrops,all under two contrasting watering *** applied simple but robust statistical procedures to resulting data(based on bootstrap methods)to compare RMR,and its components,between different plants/plant *** also provide simple graphical tools to analyze the data.

关键词： agroecosystem sustainability crop overyielding intercrop drought resistance overyield ecological components

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