The Thresholds of Soil Drought and Its Impacts on Summer Maize in Shandong Province
DONG ZhiQiang,1, LI ManHua1, LI Nan1, XUE XiaoPing1, CHEN Chen1, ZHANG JiBo1, ZHAO Hong1, HOU YingYu2, PAN ZhiHua31Shandong Provincial Climate Center, Ji'nan 250031 2National Meteorological Center, Beijing 100081 3College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193
Abstract 【Objective】This study was aimed to determine the suitable range and the drought stress thresholds of soil water on summer maize in Shandong Province, and to evaluate the effects of different drought degrees on growth and development and yield formation of summer maize quantitatively. So as to provide a basis for improving the utilization efficiency of agricultural water resources and alleviating the adverse impacts of drought stress. 【Method】Based on the data from field experiments, the suitable and unsuitable ranges of soil moisture were determined for the seedling stage, ear stage and grain stage of summer maize. By the model of WOFOST, the drought stress thresholds were analyzed with the relative water content as the driving factor. And the drought effects were assessed quantitatively through different drought degrees and their duration days. 【Result】(1) The suitable ranges of soil water during seedling stage, ear stage and grain stage of summer maize were 62%-91%, 66%-92% and 68%-94%, respectively. And the unsuitable ranges were less than 62%, 66% and 68%, respectively. (2) The thresholds of no drought, light drought, medium drought and severe drought during seedling stage were 53%, 50%, 45% and 40%, respectively. The thresholds of different drought degrees during ear stage were 58%, 48%, 43% and 37%, respectively. The thresholds of different drought degrees during grain stage were 57%, 52%, 49% and 45%, respectively. (3) The drought happened during seedling stage had the greatest effects on the total leaf weight, total stem weight and maximum leaf area index. The drought happened during ear stage and grain stage had the greatest effects on the total ear weight. And the severe drought during ear stage would result in the failure of final yield formation. 【Conclusion】The suitable ranges of soil water and the drought thresholds of summer maize were brought to light in Shandong. The drought happened during ear stage and grain stage of summer maize had more significant impacts on yield formation. Keywords:summer maize;drought;thresholds;soil moisture
PDF (581KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 董智强, 李曼华, 李楠, 薛晓萍, 陈辰, 张继波, 赵红, 侯英雨, 潘志华. 山东夏玉米土壤干旱阈值研究与影响评价[J]. 中国农业科学, 2020, 53(21): 4376-4387 doi:10.3864/j.issn.0578-1752.2020.21.007 DONG ZhiQiang, LI ManHua, LI Nan, XUE XiaoPing, CHEN Chen, ZHANG JiBo, ZHAO Hong, HOU YingYu, PAN ZhiHua. The Thresholds of Soil Drought and Its Impacts on Summer Maize in Shandong Province[J]. Scientia Acricultura Sinica, 2020, 53(21): 4376-4387 doi:10.3864/j.issn.0578-1752.2020.21.007
Fig. 3The relationship between dry matter weight and soil relative humidity at grain stage of summer maize in 2013 and 2015 respectively (P<0.05)
Table 2 表2 表2各年不同发育阶段适宜与不适宜土壤相对湿度阈值范围 Table 2The threshold range of soil relative humidity of suitable and unsuitable degree at different development stages of summer maize in 2013, 2014 and 2015 respectively (%)
Table 5 表5 表5苗期轻旱、中旱与重旱不同持续天数的各指标变化程度 Table 5The variation degree of each index of light drought, medium drought and severe drought with different duration days at seedling stage of summer maize (%)
干旱程度 Drought degree
干旱持续时间 Duration days of drought
TAGP
TWSO
TWLV
TWST
MAXLAI
轻旱 Light drought
3 d
-3.2
-2.9
-3.9
-3.7
-3.0
5 d
-3.7
-2.9
-5.7
-5.1
-4.4
10 d
-4.5
-2.7
-8.6
-7.7
-6.9
15 d
-6.1
-2.7
-13.8
-12.2
-11.3
20 d
-8.5
-3.0
-20.7
-18.4
-17.6
中旱 Medium drought
3 d
-1.7
0.1
-5.7
-4.8
-3.9
5 d
-3.0
0.0
-9.6
-8.2
-7.2
10 d
-5.9
-0.5
-17.7
-15.3
-14.5
15 d
-10.4
-2.2
-28.5
-25.1
-24.7
20 d
-17.0
-6.1
-40.8
-36.6
-37.1
重旱 Severe drought
3 d
-2.4
0.0
-7.8
-6.7
-5.5
5 d
-4.5
-0.2
-14.1
-12.1
-11.1
10 d
-10.0
-1.9
-27.6
-24.3
-23.9
15 d
-18.7
-7.2
-43.6
-39.2
-39.7
20 d
-31.8
-18.8
-60.1
-55.3
-56.8
表中TAGP、TWSO、TWLV、TWST、MAXLAI分别代表地上部总干物重、总穗重、总叶重、总茎重与最大叶面积指数。下同 The abbreviation of TAGP, TWSO, TWLV, TWST and MAXLAI represent the total above ground production, total dry weight of storage organs, total dry weight of leaves, total dry weight of stems and maximum leaf area index, respectively. The same as below
Table 6 表6 表6穗期轻旱与中旱不同持续天数的各指标变化程度 Table 6The variation degree of each index of light drought and medium drought with different duration days at ear stage of summer maize (%)
Table 7 表7 表7花粒期轻旱、中旱与重旱不同持续天数的各指标变化程度 Table 7The variation degree of each index of light drought, medium drought and severe drought with different duration days at grain stage of summer maize (%)
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