盐碱地食叶草细根对干旱复水后的响应

doi:10.13866/j.azr.2022.01.23

Abstract

Abstract:

The rational formulation of irrigation cycle of halophytes is the key factor to improve the utilization efficiency of water resources in arid areas. Taking the fine root (d≤1 mm) of leafy grass (Rumex hanus by.) as the research object, the total root length, root tip number and average root diameter at different times after re-watering were measured by drought and re-watering method, and the changing characteristics of root growth rate, mortality, root life span and turnover rate were studied, so as to provide reference basis for the establishment of the best irrigation cycle. The results showed that the root length and the number of root tips increased the most at 7 days after re-watering, and decreased at 10 to 15 days after re-watering. The fine root growth rate (RER) reached the maximum on the 4th day after re-watering, and decreased significantly on the 10th day (P<0.001). There were significant differences among different soil layers (0-20 cm and 20-40 cm) and root diameter (0-0.5 mm and 0.5-1.0 mm) (P<0.001). Both fine root net production (NRP) and RER increased at first and then decreased. 15 days after re-watering, the fine root survival rate of fine root in the 20 cm soil layer and 20-40 cm soil layer was 3.6% and 16.9% respectively. The fine root survival rate of 0.5-1.0 mm diameter fine root was higher than that of 0-0.5 mm fine root. The results showed that after re-watering, the life span of fine roots in the soil layer of 20 cm was significantly higher than that in the 0-20 cm soil layer at 8.09~13.83 days (P<0.05). The fine root of leafy grass can achieve the purpose of survival by increasing the fine root of 0.5-1.0 mm in 20-40 cm soil layer to cope with and adapt to drought and re-watering. Considering the growth of leaf-eating grass and the supply of agricultural water resources, the best irrigation period of leaf-eating grass in saline-alkali land in summer is 10 days.

Key words: saline soil, fine root, daily growth rate, mortality, turnover rate, median life

ZHENG Xu,YANG Zhixin,HAO Dongmei,WANG Runrun,Li Luhua,ZHANG Fenghua,WANG Jiaping. Response of Rumex hanus by. roots to drought after rehydration[J].Arid Zone Research, 2022, 39(1): 240-249.

Figures/Tables 9

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References 45

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复水天数/d	根长/cm			根尖数/个			平均根直径/mm
复水天数/d	0~20 cm	20~40 cm	0~40 cm	0~20 cm	20~40 cm	0~40 cm	0~20 cm	20~40 cm	0~40 cm
0	473.3±62.6b	624.6±46.8a	1097.9±86.3	162.3±32.2a	144.8±33.8a	307.1±56.2	0.86±0.22a	0.63±0.32b	0.74±0.24
2	491.0±22.7b	637.2±33.5a	1128.2±27.6	187.3±21.6a	152.6±23.9b	339.9±18.6	0.82±0.04a	0.59±0.21b	0.71±0.16
4	512.6±37.6b	672.6±27.3a	1185.2±26.3	212.6±18.6a	172.6±16.6b	384.6±15.3	0.72±0.16a	0.54±0.18b	0.63±0.14
7	573.8±46.3b	733.6±43.6a	1307.4±44.2	243.6±26.3a	193.3±22.3b	436.9±27.3	0.53±0.22a	0.46±0.12a	0.50±0.23
10	637.4±24.6b	764.6±30.8a	1402.0±26.8	267.4±17.6a	208.3±18.6b	475.7±24.6	0.58±0.17a	0.62±0.07a	0.60±0.08
15	660.4±33.6b	788.3±27.6a	1448.7±30.6	281.6±22.6a	216.3±24.6b	497.9±20.8	0.66±0.22a	0.64±0.09a	0.65±0.18

	RER		CNRP		CDLL
	F	P	F	P	F	P
直径	79.28	<0.001^***	133.09	<0.001^***	38.31	<0.001^***
土层深度	7.967	0.005^**	36.37	<0.001^***	19.44	<0.001^***
直径×土层深度	0.543	0.461	4.41	0.036^**	0.34	0.559

土壤深度/cm	CLLP/(cm·m^-2)	CDLL/(cm·m^-2)	总根长的占比/%	根死亡率/%	RER/(cm·d^-1)	总根数/个
0~20	112.3a	62.4a	62.7a	58.2a	0.31±0.22a	99a
20~40	106.8a	24.4b	37.3b	22.8b	0.27±0.32b	56b

	直径/mm		土层/cm
	0~0.5	0.5~1.0	0~20	20~40
中位寿命/d	9.90±0.27b	11.35±0.28a	11.41±0.35b	13.83±0.33a
周转	1.52	1.32	1.31	1.08
根尖数/个	97	58	99	56

土层/cm	根直径/mm	中位寿命/d	周转	根尖数/个
0~20	0~0.5	8.09±0.33c	1.85	71
0~20	0.5~1.0	10.62±0.50b	1.41	28
20~40	0~0.5	11.62±0.39a	1.29	26
20~40	0.5~1.0	12.21±0.39a	1.23	30

Response of Rumex hanus by. roots to drought after rehydration

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