基于Landsat遥感数据的河套灌区地下水对不同作物生长影响及其阈值研究<sub><sup> </sup></sub>

马小茗; 李瑞平; 闫志远; 李鑫磊; 李正中; 潘红梅

引用本文:	马小茗,李瑞平,闫志远,等.基于Landsat遥感数据的河套灌区地下水对不同作物生长影响及其阈值研究[J].灌溉排水学报,2022,():-.
	maxiaoming,liruiping,yanzhiyuan,et al.基于Landsat遥感数据的河套灌区地下水对不同作物生长影响及其阈值研究[J].灌溉排水学报,2022,():-.

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基于Landsat遥感数据的河套灌区地下水对不同作物生长影响及其阈值研究
马小茗¹, 李瑞平¹, 闫志远¹, 李鑫磊¹, 李正中², 潘红梅²
1.内蒙古农业大学水利与土木建筑工程学院;2.内蒙古河套灌区水利发展中心解放闸分中心沙壕渠试验站

摘要:

【目的】探讨地下水埋深和矿化度对作物长势的影响，得出适宜作物生长的地下水埋深范围及地下水矿化度阈值。【方法】以河套灌区解放闸灌域为研究对象，利用决策树分类法解析解放闸灌域的种植结构，采用克里金插值法对地下水埋深数据进行区域化处理，对同一地下水埋深对应得NDVI求取均值绘制曲线图，利用采样点处地下水矿化度与去对应NDVI绘制散点图，综合两者率定出河套灌区解放闸灌域适宜农作物种植区的地下水埋深埋深与矿化度阈值。【结果】(1)研究区内玉米在拔节期、抽穗期以及灌浆期内适宜生长的地下水埋深范围分别为1.2~1.7m、1.3~1.8m和1.3~1.8m；小麦在拔节期、抽穗期以及灌浆期3个生育期内，适宜生长的地下水埋深范围分别为1.1~1.5m、1.1~1.5m、1.2~1.7m；适宜葵花现蕾期与灌浆期生长的地下水埋深范围分别为1.1~1.6m和1.2~1.7m。(2)研究区内适宜作物生长的地下水矿化度阈值为6g/L；TDS≤3g/L时最适宜植被生长；3g/L6g/L基本不适宜作物生长。【结论】研究区应通过控制灌水量进而将地下水埋深及矿化度控制在适宜作物生长的范围内，减小地下水对作物生长的影响。

关键词: NDVI;作物生长;河套灌区;地下水埋深;地下水矿化度

DOI：

分类号:S273.4

基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）

Study on the effect of groundwater on different crop growth and its threshold in Hetao Irrigation area based on Landsat remote sensing data

maxiaoming¹, liruiping¹, yanzhiyuan¹, lixinlei¹, lizhengzhong², panhongmei²

1.Inner Mongolia Agricultural University;2.Sand-trench test station of Jiefang Sluice Sub-center of water Conservancy Development Center of Hetao Irrigation District, Inner Mongolia

Abstract:

Abstract: 【Objective】To explore the influence of groundwater depth and salinity on crop growth, and to obtain the suitable groundwater depth range and groundwater salinity threshold for crop growth.【method】In hetao irrigation district liberation brake irrigation region as the research object, using the decision tree classification analytical liberation brake irrigation field planting structure, the kriging interpolation method is adopted to regional groundwater depth data processing, on the same embedded depth of groundwater of NDVI due to calculate average graph, using sampling point of groundwater salinity and corresponding NDVI to draw a scatter diagram, The groundwater buried depth and salinity threshold of suitable crop planting area in Jiefangzha irrigation area of Hetao irrigation area were determined by combining the two rates.【Results】(1) The groundwater depth suitable for maize growth in the study area at jointing stage, heading stage and filling stage was 1.2~1.7 m, 1.3~1.8 m and 1.3~1.8 m, respectively; At jointing stage, heading stage and filling stage, the groundwater depth suitable for wheat growth was 1.1~1.5m, 1.1~1.5m and 1.2~1.7m, respectively. The suitable groundwater depth range of sunflower bud stage and filling stage is 1.1~1.6m and 1.2~1.7m, respectively. (2) The threshold of groundwater salinity suitable for crop growth in the study area is 6g/L; TDS≤3g/L is the most suitable for vegetation growth. 3g/L TDS>6g/L is basically not suitable for crop growth.【Conclusion】Groundwater depth and salinity should be controlled in a suitable range for crop growth by controlling irrigation amount, and the influence of groundwater on crop growth should be reduced.

Key words: NDVI; Crop growth; Hetao Irrigation area; Groundwater depth; Groundwater salinity