利用遥感技术确定水资源对缩小水土生产力差距的影响--甘蔗案例研究

IF 5.6 1区 农林科学 Q1 AGRONOMY
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引用次数: 0

摘要

背景可持续提高农业产量的两个主要限制因素是土地和淡水资源稀缺。因此,确定土地和水的生产力差距对于衡量这些资源的利用效率以及评估饲料和粮食增产范围至关重要。使用实地数据监测大规模或长期的生产力差距具有挑战性,而且成本高昂。本文提出了一个整合遥感数据和实地数据的框架,用于评估:(1)水土生产力差距;(2)亮点--水土生产力等于或高于目标值的田块;(3)增产对灌溉水的净需求。结果结果表明,沟灌田的生产率差距最大(13.1 吨/公顷),其次是喷灌(12.6 吨/公顷)和中枢灌溉(9.4 吨/公顷)。分析表明,遥感提供了一个可行的信息来源,可用于诊断生产力制约因素,以及亮点如何为克服这些制约因素提供最佳田间管理方法。该框架证明了其对政策制定者和利益相关者的有用性,有助于他们就稀缺蓝水的分配做出明智决策,以提高农业产量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Establishing the water resources implications for closing the land and water productivity gaps using remote sensing – A case study of sugarcane

Context

Two of the key limitations for sustainably increasing agricultural production are the scarcity of land and fresh water resources. Establishing land and water productivity gaps is, therefore, essential for measuring how efficiently these resources are being utilised and assessing the scope for increasing feed and food production. Monitoring the productivity gaps at large scales or over time using field data is challenging and expensive. Remote sensing offers an alternative data source to reveal spatial and temporal variations in productivity.

Objective

This paper presents a framework that integrates remote sensing derived data and field data to assess (1) land and water productivity gaps, (2) bright spots – fields exhibiting land- and water productivity equal to or higher than the target, and (3) net irrigation water demand for increasing production.

Methods

The framework is developed and applied to the Xinavane sugarcane estate in Mozambique, demonstrating its practical application through systematic evaluation on a 6637 ha section of the estate divided by different irrigation application methods.

Results

The results reveal that the productivity gap is the highest on fields irrigated by furrow (13.1 tonnes (ton) per ha), followed by sprinkler (12.6 ton/ha) and centre pivot (9.4 ton/ha). Bridging the productivity gap on the same cropland results in an increased sugarcane production of 12.5 % requiring 8.5 % additional irrigation water, whereas achieving the same production increase through irrigation expansion requires more blue water.

Conclusions

The analyses show that remote sensing provides a viable source of information to diagnose the productivity constraints and how bright spots can provide insights into the best field management practices to overcome them. The framework demonstrates its usefulness for policy makers and stakeholders to make informed decisions on the scarce blue water allocation for enhancing agricultural production.
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来源期刊
Field Crops Research
Field Crops Research 农林科学-农艺学
CiteScore
9.60
自引率
12.10%
发文量
307
审稿时长
46 days
期刊介绍: Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.
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