Comprehensive evaluation of alfalfa water quota in shallow buried drip irrigation based on entropy weight-TOPSIS

doi:10.6048/j.issn.1001-4330.2024.10.021

Abstract

Abstract:

【Objective】 To explore the effects of different irrigation quotas on alfalfa and evaluate the appropriate irrigation quota. 【Methods】 Taking alfalfa with shallow-buried drip irrigation as the research object, five levels of irrigation quotas (581,506,431,356,281 m³/hm²) were designed, and the ground irrigation CK ( 469 m³/hm²) was used as the control. Afterwards,the effects of different irrigation quotas on the growth, yield and water use of alfalfa were studied. Meanwhile, the entropy weight-TOPSIS comprehensive evaluation method was used to optimize the irrigation quota suitable for shallow-buried drip irrigation of alfalfa in this area. 【Results】 The plant height, stem diameter, yield and water consumption of alfalfa increased with the increase of irrigation quota in an appropriate range, and the difference was significant (P<0.05). However, excessive irrigation had no significant effect on the increase of plant height, stem diameter and yield of alfalfa (P < 0.05). Water use efficiency (WUE) and irrigation water use efficiency (IWUE) gradually decreased with the increase of irrigation quota, and the water consumption between stubbles showed the second stubble > the third stubble > the first stubble (P < 0.05). 【Conclusion】 The irrigation quota is 506 m³/hm², so it is strongly recommended this quota.

Key words: shallow buried drip irrigation; surface drip irrigation; alfalfa; irrigation quota; entropy weight-TOPSIS; comprehensive evaluation method

摘要：

【目的】 研究不同灌水定额对滴灌紫花苜蓿的影响并优选适宜的灌水定额。【方法】 以浅埋式滴灌紫花苜蓿为研究对象,设计5个水平的灌水定额(581、506、431、356和281 m³/hm²),以地面灌CK(469 m³/hm²)为对照,分析灌水定额对苜蓿生长、产量及水分利用的影响,并采用熵权-TOPSIS综合评价法优选适宜于该地区苜蓿浅埋式滴灌的灌水定额。【结果】 苜蓿的株高、茎粗、产量和耗水量均在适当的范围内随灌水定额的增大而增大,差异显著(P<0.05),但过高的灌水量对苜蓿株高、茎粗、产量的提高并无显著影响(P<0.05);水分利用效率(WUE)和灌溉水利用效率(IWUE)随灌水定额的增大逐渐降低,茬次之间的耗水量表现为第2茬>第3茬>第1茬(P<0.05)。灌水定额为506 m³/hm²时贴近度最高,评价结果最佳,且苜蓿产量为16 079 kg/hm²。【结论】 新疆北疆浅埋式滴灌苜蓿的最优灌水定额为506 m³/hm²。

关键词: 浅埋式滴灌, 地表滴灌, 紫花苜蓿, 灌水定额, 熵权—TOPSIS, 综合评价法

CLC Number:

S542.4

Maihemuti Baiheti, DING Feng, LI Yan, DANG Loongxin. Comprehensive evaluation of alfalfa water quota in shallow buried drip irrigation based on entropy weight-TOPSIS[J]. Xinjiang Agricultural Sciences, 2024, 61(10): 2537-2546.

麦合穆提·拜合提, 丁峰, 李彦, 党龙芯. 基于熵权-TOPSIS的浅埋式滴灌紫花苜蓿灌水定额的综合评价[J]. 新疆农业科学, 2024, 61(10): 2537-2546.

Figures/Tables 9

Tab.1 Basic situation of soil

土层深度 Depth of soil layer (cm)	pH值 pH value	总盐量 Total salt content	全氮 Total nitrogen (g/kg)	全磷 Total phosphorus (g/kg)	全钾 Whole potassium (g/kg)	有机质 Organic substance (g/kg)	速效氮 Avaliable nitrogen (mg/kg)	速效磷 Avaliable phosphorus (mg/kg)	速效钾 Ouick- actiong potassium (mg/kg)
0~20	8.57	0.63	0.84	0.79	18.01	14.45	54.2	6.93	211.3
20~40	8.67	0.79	0.73	0.72	18.6	12.2	46.3	4.3	178.6
40~60	8.72	0.91	0.64	0.65	18.9	11.12	37.9	3.1	148.6

Fig.1 Planting method and drip irrigation belt layout

Tab.2 Alfalfa growth stage differentiation

茬次 Cuttings	返青期 Regeneration period	分枝期 Branching period	现蕾期 Squaring period	初花期 Initial flowering period	总计 Total(d)
第1茬 The first	4月26日	5月5日	5月25日	6月12日	46
第2茬 The second		6月15日	7月19日	7月27日	42
第3茬 The third		7月29日	9月5日	9月14日	45

Tab.3 The design of experiment

试验处理 Treatments	灌水定额 Quota of irrigating water (m³/hm²)	灌水周期 Interval of irrigation(d)	灌水次数 Frequency of irrigation			总灌溉定额 Total irrigation quota (m³/hm²)
试验处理 Treatments	灌水定额 Quota of irrigating water (m³/hm²)	灌水周期 Interval of irrigation(d)	第一茬 First cutting	第二茬 First cutting	第三茬 First cutting	总灌溉定额 Total irrigation quota (m³/hm²)
W₁	581	8~12	3	5	4	6 975
W₂	506	8~12	3	5	4	6 075
W₃	431	8~12	3	5	4	5 173
W₄	356	8~12	3	5	4	4 276
W₅	281	8~12	3	5	4	3 373
W₆(CK)	469	8~12	3	5	4	5 625

Fig.2 Plant height and stem diameter of alfalfa under different treatments Note:Different lowercase letters indicated significant differences between treatments(P<0.05),the same as below

Fig.3 Alfalfa hay yield

Tab.4 Changes of different irrigation quotas on alfalfa yield, water consumption, WUE and IWUE

茬次 Cuttings	指标 Indexes	W₁处理 W₁ treatments	W₂处理 W₂ treatments	W₃处理 W₃ treatments	W₄处理 W₄ treatments	W₅处理 W₅ treatments	CK处理 CK treatments
第1茬 The first	干产量(kg/hm²)	5 213.1±239.5^a	5 337.5±133.5^a	4 652.9±107^b	4 301.4±121^c	3 413.9±126.7^d	4 663.6±67^b
	耗水量(mm)	114.9±3.8^a	99.9±1.7^b	95.9±0.4^c	91.2±1.4^d	77.6±1.4^e	102.1±1^b
	WUE(kg/(hm²·mm))	45.4±3^bc	53.5±2.1^a	48.5±1.2^b	47.2±1.9^bc	44±1.2^c	45.7±0.7^bc
	IWUE/(kg/(hm²·mm))	17.9±0.8^d	21.1±0.5^b	21.6±0.5^b	24.2±0.7^a	24.3±0.9^a	19.9±0.3^c
第2茬 The second	干产量(kg/hm²)	5 504.8±77.4^a	5 629.3±164.8^a	4 726.3±91.9^b	4 215.6±40.2^c	3 419.9±45.5^d	4 756.9±115^b
	耗水量(mm)	168.7±2.9^a	156.8±2.6^b	148.8±0.8^c	130.1±5.9^d	116.5±1.8^e	142.5±1.9^c
	WUE(kg/(hm²·mm))	32.6±0.5^b	35.9±0.5^a	33.2±0.4^b	33±0.3^b	29.9±1.2^c	33.4±1.3^b
	IWUE/(kg/(hm²·mm))	23.7±0.3^d	27.8±0.8^b	27.4±0.5^b	29.6±0.3^a	30.4±0.4^a	25.4±0.6^c
第3茬 The third	干产量(kg/hm²)	4 909.4±267.7^a	5 111.9±120.7^a	4 575.5±203.4^b	4 170.7±23.6^c	2 928±144.1^d	4 579.5±99.1^b
	耗水量(mm)	139.8±2.3^a	122.4±4.7^b	109.4±2^c	103.8±0.7^d	95.5±0.4^e	122.5±1^b
	WUE(kg/(hm²·mm))	35.1±1.9^b	41.9±1^a	41.7±2.1^a	41.6±0.2^a	31.1±1.5^c	37.4±1.1^b
	IWUE/(kg/(hm²·mm))	28.2±1.5^d	33.7±0.8^bc	35.4±1.6^b	39±0.2^a	34.7±1.7^bc	32.6±0.7^c
总计 Total	干产量(kg/hm²)	15 627.3±67.4^b	16 078.7±153.6^a	13 954.8±247.8^c	12 687.7±126.9^d	9 761.8±119.4^e	13 999.9±127.6^c
	耗水量(mm)	423.4±1.7^a	379±7^b	354.1±2.7^d	325.1±7.5^e	289.6±2.5^f	367±1.8^c
	WUE(kg/(hm²·mm))	36.9±0.1^d	42.4±0.3^a	40.1±1^b	39.7±0.8^b	34.1±0.8^e	38.1±0.5^c
	IWUE(kg/(hm²·mm))	22.4±0.1^e	26.5±0.3^c	27±0.5^c	29.7±0.3^a	28.9±0.4^b	24.9±0.2^d

Tab.5 Comparisons of entropy value,coefficient of difference and weight of each index

处理编号 Processing number	耗水量 Water consumption	干草产量 Hay yieid	株高 Height	茎粗 Stem thick	WUE	IWUE
熵值E_j	0.855	0.879	0.865	0.869	0.863	0.863
差异系数G_j	0.145	0.121	0.135	0.131	0.137	0.137
权重W_j	0.180	0.151	0.168	0.163	0.170	0.170

Tab.6 Comparisons of topsis results

处理编号 Processing number	正理想解 $D_{i}^{+}$ Exactly $D_{i}^{+}$	负理想解 D_i Negative ideal solution D_i	贴近度 S_i Proximity S_i	排序 Sequence
W₁处理 W₁ treatments	0.179	0.157	0.467	5
W₂处理 W₂ treatments	0.095	0.211	0.689	1
W₃处理 W₃ treatments	0.096	0.164	0.631	2
W₄处理 W₄ treatments	0.112	0.170	0.603	3
W₅处理 W₅ treatments	0.199	0.156	0.440	6
CK处理 CK treatments	0.130	0.134	0.507	4

Tab.6 Comparisons of topsis results

处理编号 Processing number	正理想解 $D_{i}^{+}$ Exactly $D_{i}^{+}$	负理想解 D_i Negative ideal solution D_i	贴近度 S_i Proximity S_i	排序 Sequence
W₁处理 W₁ treatments	0.179	0.157	0.467	5
W₂处理 W₂ treatments	0.095	0.211	0.689	1
W₃处理 W₃ treatments	0.096	0.164	0.631	2
W₄处理 W₄ treatments	0.112	0.170	0.603	3
W₅处理 W₅ treatments	0.199	0.156	0.440	6
CK处理 CK treatments	0.130	0.134	0.507	4

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