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Water productivity and its allometric mechanism in mulching cultivated maize (Zea mays L.) in semiarid Kenya
Agricultural Water Management ( IF 6.7 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.agwat.2020.106647
Xiao-Feng Zhang , Chong-Liang Luo , Hong-Xu Ren , David Mburu , Bao-Zhong Wang , Levis Kavagi , Kiprotich Wesly , Aggrey Bernard Nyende , You-Cai Xiong

Abstract Allometry is extensively used to describe the scaling relationship between individual size and metabolite allocation. Micro-field rain-harvesting system can improve soil water availability and thus alter the allocation of individual biomass among organs. Yet the eco-physiological mechanism based on allometric scaling theory has been little investigated under various mulching conditions. A field experiment was conducted using maize variety Yuyuan7879 in Juja, Kenya for two growing seasons (cross-year) from 2015 to 2016, and from 2016 to 2017 respectively. Four treatments were designed as ridge-furrow mulching (RFM) with black plastic mulching (RFMB), transparent plastic mulching (RFMT), grass straw mulching (RFMG) and conventional flat planting (CK). We found that RFMB, RFMT and RFMG significantly increased grain yield by 106%, 109% and 32% in 2015, and 101%, 96% and 30% in 2016 respectively, in comparison with CK. Mulching treatments improved soil temperature and moisture and significantly increased crop water productivity (CWP). Mulching treatments drastically changed the allometric relationship between metabolic rate (leaf biomass) and individual size (lgy = αlgx + lgβ), and optimized the size-dependent reproductive allocation. In the relationship between leaf biomass (y-axis) vs aboveground biomass (x-axis), mulching treatments significantly declined the value of α (α

中文翻译:

肯尼亚半干旱地区覆盖栽培玉米(Zea mays L.)的水分生产力及其异速生长机制

摘要 异速生长广泛用于描述个体大小与代谢物分配之间的比例关系。微田雨水收集系统可以提高土壤水分利用率,从而改变个体生物量在器官之间的分配。然而,基于异速生长理论的生态生理机制在各种覆盖条件下的研究很少。使用玉米品种玉源7879在肯尼亚Juja进行了2015-2016年和2016-2017年两个生长季(跨年)的田间试验。四种处理设计为垄沟覆盖(RFM)+黑色地膜(RFMB)、透明地膜(RFMT)、草秆覆盖(RFMG)和常规平地种植(CK)。我们发现 RFMB、RFMT 和 RFMG 使谷物产量显着提高了 106%,与CK相比,2015年分别为109%和32%,2016年分别为101%、96%和30%。覆盖处理改善了土壤温度和湿度,并显着提高了作物水分生产力 (CWP)。覆盖处理极大地改变了代谢率(叶生物量)和个体大小(lgy = αlgx + lgβ)之间的异速生长关系,并优化了大小依赖的繁殖分配。在叶生物量(y 轴)与地上生物量(x 轴)之间的关系中,覆盖处理显着降低了 α (α 覆盖处理极大地改变了代谢率(叶生物量)和个体大小(lgy = αlgx + lgβ)之间的异速生长关系,并优化了大小依赖的繁殖分配。在叶生物量(y 轴)与地上生物量(x 轴)之间的关系中,覆盖处理显着降低了 α (α 覆盖处理极大地改变了代谢率(叶生物量)和个体大小(lgy = αlgx + lgβ)之间的异速生长关系,并优化了大小依赖的繁殖分配。在叶生物量(y 轴)与地上生物量(x 轴)之间的关系中,覆盖处理显着降低了 α (α
更新日期:2021-03-01
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