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| Water productivity and its allometric mechanism in mulching cultivated maize (Zea mays L.) in semiarid Kenya | |
| Zhang, Xiao-Feng; Luo, Chong-Liang; Ren, Hong-Xu; Mburu, David2; Wang, Bao-Zhong; Kavagi, Levis3; Wesly, Kiprotich; Nyende, Aggrey Bernard2; Xiong, You-Cai | |
| 2021 | |
| 发表期刊 | AGRICULTURAL WATER MANAGEMENT
 |
| ISSN | 0378-3774 |
| 卷号 | 246 |
| 摘要 | 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 = alpha lgx + lg beta), 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 alpha (alpha < 1; P < 0.01), suggesting that less photosynthetic product was allocated in leaves in mulching treatments than in CK. As for the allometric relationship between grain yield and aboveground biomass, the alpha was generally significantly more than 1 in RFMB and RFMT, and significantly less than 1 in RFMG and CK, demonstrating that more photosynthates were allocated to reproductive growth under plastic mulching. Also, the variation of allometric relationship between reproductive and vegetative biomass provided further evidence that plastic mulching facilitated substance transportation from vegetative to reproductive organs. In conclusion, plastic mulching significantly improved soil hydrothermal condition, increased individual reproductive allocation and ultimately improved grain yield and CWP at population level. |
| 关键词 | Ridge-furrow mulching Maize Reproductive allocation Allometric relationship Semiarid Kenya |
| 学科领域 | Agronomy ; Water Resources |
| DOI | 10.1016/j.agwat.2020.106647 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS关键词 | LOESS PLATEAU ; REPRODUCTIVE ALLOCATION ; PLASTIC FILM ; FIELD ; RIDGE ; TEMPERATURE ; COMPETITION ; MANAGEMENT ; CATCHMENT ; MOISTURE |
| WOS研究方向 | Science Citation Index Expanded (SCI-EXPANDED) |
| WOS记录号 | WOS:000611819900004 |
| 出版者 | ELSEVIER |
| 文献子类 | Article |
| 出版地 | AMSTERDAM |
| EISSN | 1873-2283 |
| 资助机构 | Natural Science Foundation of China [31570415] ; State Technology Support Program of China [2015BAD22B04] ; National Specialized Support Plan for Outstanding Talents of China (Ten Thousand People Plan) |
| 作者邮箱 | xiongyc@lzu.edu.cn |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ibcas.ac.cn/handle/2S10CLM1/26564 |
| 专题 | 中科院北方资源植物重点实验室 |
| 作者单位 | 1.Lanzhou Univ, Sch Life Sci, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China 3.Jomo Kenyatta Univ Agr & Technol, POB 31382-00600, Nairobi, Kenya 4.United Nations Environm Programme, POB 47074-00100, Nairobi, Kenya |
| 推荐引用方式 GB/T 7714 | Zhang, Xiao-Feng,Luo, Chong-Liang,Ren, Hong-Xu,et al. Water productivity and its allometric mechanism in mulching cultivated maize (Zea mays L.) in semiarid Kenya[J]. AGRICULTURAL WATER MANAGEMENT,2021,246. |
| APA | Zhang, Xiao-Feng.,Luo, Chong-Liang.,Ren, Hong-Xu.,Mburu, David.,Wang, Bao-Zhong.,...&Xiong, You-Cai.(2021).Water productivity and its allometric mechanism in mulching cultivated maize (Zea mays L.) in semiarid Kenya.AGRICULTURAL WATER MANAGEMENT,246. |
| MLA | Zhang, Xiao-Feng,et al."Water productivity and its allometric mechanism in mulching cultivated maize (Zea mays L.) in semiarid Kenya".AGRICULTURAL WATER MANAGEMENT 246(2021). |
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| Water_productivity_a（1649KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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