调理剂及农艺措施对污染稻田中水稻吸收镉的影响

doi:10.3864/j.issn.0578-1752.2020.03.010

Abstract

Abstract:

【Objective】How to safely use cadmium (Cd) to prevent it from contaminating cultivated land to produce up to standard rice is a hot topic for scholars. This paper mainly explored the effects of water management, conditioning agent measures and combined measures on the Cd reduction of rice in polluted rice fields. It aimed to reduce the bioavailability of soil Cd and the Cd content in rice under the premise of not significantly reducing rice yield【Method】Field rice experiments were carried out in a moderately Cd-contaminated paddy field in Zhuzhou City, Hunan Province, through a field plot test. In the experiment, rice was planted for two seasons. The early rice variety was Zhongjiazao17, and the late rice variety was Taiyou390. The test setup design was divided into 6 groups, namely water management treatment (T2), application of silicon fertilizer treatment (T3), application of bamboo charcoal treatment (T4), application of silicon fertilizer combined with water management treatment (T5), application of bamboo charcoal combined with water management treatment (T6), and control (T1), and each treatment was repeated 3 times.【Result】The effective Cd content in the paddy soil was reduced by the treatments. The bamboo charcoal combined with water management treatment (T6) significantly reduced the soil moisture in the two rice grow seasons. The silicon fertilizer combined with water management treatment (T5) had the largest reduction of available cadmium in the late rice soil. The treatments all had the effect of reducing the Cd content in all parts of rice. In the aspect of cadmium content of brown rice, the reduction of Cd content in brown rice in the five experimental treatments was the best in combination with the repair technology, namely silicon fertilizer combined with water management treatment (T5). Combined with carbon and water management (T6), in the water management and repair technology, the water management in the whole growth period has the best Cd effect, the highest reduction was 29.23%; in the application of conditioning agent repair technology, silicon fertilizer treatment (T3) and bamboo charcoal treatment (T4) significantly reduced rice husks and brown rice (P＜0.05). Under the silicon fertilizer treatment (T3), brown rice had the highest Cd amplitude of 49.23%; under the bamboo charcoal treatment (T4), brown rice had the highest Cd amplitude of 47.69%. In the treatment technology, the Cd content of rice brown rice could be significantly reduced. The silicon fertilizer combined with water management treatment (T5) of brown rice decreased Cd range from 60.34% to 78.46%, and bamboo charcoal combined with water management (T6) brown rice decreased Cd range from 56.90% to 67.69%. At the same time, this paper analyzed the correlation between soil available cadmium content and cadmium content in various parts of rice, and found that there was very significant positive correlation between rice grain (rice husk and brown rice) and soil available cadmium content (P＜0.01), and two rice varieties were consistent. The treatments also had the effect of reducing the enrichment coefficient of various parts of rice, and the best results were obtained by silicon fertilizer combined with water management treatment (T5) and carbon combined water management (T6). Regarding the effect of reducing the rice-to-grain transfer coefficients from different parts of the rice, the rules were inconsistent, but the transfer coefficients of the stalk sheaths and leaves to the grains (rice hulls and brown rice) were significantly reduced, except for water management (T2) treatment. In terms of rice yield, only water management treatment (T2) significantly reduced yield of Zhongjiazao17, and the other treatments did not decrease significantly. Each treatment had no significant effect on Taiyou390.【Conclusion】The combination measures were better than single water management or single conditioner treatment, and the maximum Cd drop in rice Cd-contaminated rice fields reached 78.46% when rice yield was not significantly reduced, which could further ensure the safe use of Cd-contaminated farmland.

Key words: rice, water management, cadmium, silicon fertilizer, bamboo charcoal

PENG Ou,LIU YuLing,TIE BaiQing,YE ChangCheng,ZHANG Miao,LI YuanXingLu,ZHOU JunChi,XU Meng,ZHANG Yan,LONG Yong. Effects of Conditioning Agents and Agronomic Measures on Cadmium Uptake by Rice in Polluted Rice Fields[J].Scientia Agricultura Sinica, 2020, 53(3): 574-584.

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References 36

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处理 Treatment	土壤Cd含量 Soil Cd concentration (mg·kg^-1)	早稻土壤有效态Cd含量 Soil available Cd concentration in early rice (mg·kg^-1)	晚稻土壤有效态Cd含量 Soil available Cd content in late rice (mg·kg^-1)
T1	1.52±0.21a	1.17±0.13ab	1.15±0.07a
T2	1.47±0.15a	1.19±0.16a	1.05±0.08a
T3	1.47±0.14a	0.97±0.15ab	0.94±0.08ab
T4	1.43±0.16a	0.92±0.11b	0.99±0.09ab
T5	1.51±0.06a	0.96±0.14ab	0.80±0.06c
T6	1.54±0.08a	0.91±0.13b	0.89±0.03bc

品种Variety	部位Organ	拟合公式Fitting formula	拟合度R-squared	相关系数Correlation coefficient
中嘉早17 Zhongjiazao 17	根系 Root	y = 12.1070x - 2.9678	R² = 0.8457	r=0.551*
	茎鞘 Stem-sheath	y = 3.1702x + 0.1614	R² = 0.4864	r=0.339
	叶片 Leaf	y = 0.9363x - 0.3450	R² = 0.5852	r=0.590*
	稻壳 Rice husk	y = 0.8912x - 0.4040	R² = 0.7274	r=0.853**
	糙米 Brown rice	y = 0.7232x - 0.3660	R² = 0.7063	r=0.840**
泰优390 Taiyou 390	根系 Root	y = 8.5009x + 2.6206	R² = 0.2303	r=0.480*
	茎鞘 Stem-sheath	y = 3.9923x + 2.1199	R² = 0.2296	r=0.479*
	叶片 Leaf	y = 0.4759x + 0.7394	R² = 0.0478	r=0.219
	稻壳 Rice husk	y = 0.9209x - 0.4151	R² = 0.4199	r=0.648**
	糙米 Brown rice	y = 1.1700x - 0.7611	R² = 0.4564	r=0.676**

品种 Variety	处理 Treatment	根系/土壤 Root/Soil	茎鞘/土壤 Stem-sheath/Soil	叶片/土壤 Leaf/ Soil	稻壳/土壤 Rice husk/ Soil	糙米/土壤 Brown rice/ Soil
中嘉早17 Zhongjiazao 17	T1	7.87±0.62a	2.85±0.39a	0.93±0.04a	0.52±0.00a	0.38±0.00a
	T2	7.32±0.64a	2.09±0.20b	0.83±0.09ab	0.38±0.08b	0.31±0.06b
	T3	5.57±0.19b	2.19±0.38b	0.69±0.13b	0.28±0.04c	0.24±0.03c
	T4	6.21±0.50b	2.41±0.00ab	0.79±0.03ab	0.31±0.04bc	0.25±0.04bc
	T5	5.13±0.75b	2.07±0.08b	0.74±0.20ab	0.24±0.04c	0.15±0.02d
	T6	5.49±0.69b	1.98±0.19b	0.80±0.02ab	0.28±0.02c	0.16±0.00d
泰优390 Taiyou 390	T1	8.40±0.08a	4.80±0.19a	0.93±0.04a	0.49±0.01a	0.42±0.05a
	T2	8.27±0.12a	4.11±0.13b	0.83±0.09ab	0.36±0.00b	0.31±0.01b
	T3	6.24±0.86c	3.94±0.03b	0.69±0.13b	0.26±0.03d	0.22±0.04c
	T4	7.54±0.28ab	3.90±0.18b	0.79±0.03ab	0.32±0.01c	0.23±0.05c
	T5	6.00±0.79c	3.26±0.54c	0.74±0.20ab	0.22±0.02e	0.09±0.03d
	T6	6.68±0.18bc	3.87±0.14b	0.80±0.02ab	0.23±0.02de	0.13±0.05d

品种 Variety	处理 Treatment	根系/茎鞘 Root/ Stem-sheath	茎鞘/叶片 Stem-sheath/ Leaf	茎鞘/稻壳 Stem-sheath/ Rice husk	茎鞘/糙米 Stem-sheath/ Brown rice	叶片/稻壳 Leaf/ Rice husk	叶片/糙米 Stem-sheath / Brown rice
中嘉早17 Zhongjiazao 17	T1	0.36±0.02a	0.33±0.03bc	0.18±0.03a	0.14±0.02a	0.56±0.03a	0.41±0.02a
	T2	0.29±0.00b	0.40±0.01ab	0.18±0.02a	0.15±0.02a	0.46±0.05b	0.37±0.04ab
	T3	0.39±0.06a	0.32±0.00c	0.13±0.00b	0.11±0.00b	0.41±0.02bc	0.34±0.02b
	T4	0.39±0.03a	0.33±0.01bc	0.13±0.02b	0.10±0.01b	0.40±0.07bc	0.32±0.05b
	T5	0.41±0.05a	0.35±0.08abc	0.12±0.01b	0.07±0.01c	0.34±0.04c	0.21±0.03c
	T6	0.36±0.01a	0.41±0.03a	0.14±0.00db	0.08±0.01bc	0.35±0.02c	0.20±0.00c
泰优390 Taiyou 390	T1	0.57±0.03abc	0.19±0.02ab	0.10±0.01a	0.09±0.01a	0.52±0.01a	0.45±0.03a
	T2	0.50±0.01c	0.20±0.02ab	0.09±0.00b	0.08±0.00ab	0.44±0.05b	0.38±0.03b
	T3	0.64±0.09a	0.18±0.03b	0.07±0.01c	0.06±0.01bc	0.37±0.02b	0.32±0.00bc
	T4	0.52±0.04bc	0.20±0.00ab	0.08±0.00b	0.06±0.02bc	0.40±0.00b	0.30±0.07c
	T5	0.54±0.02bc	0.22±0.02a	0.07±0.01c	0.03±0.00d	0.31±0.06c	0.12±0.01d
	T6	0.58±0.00ab	0.21±0.01ab	0.06±0.01c	0.04±0.01cd	0.28±0.02c	0.17±0.05d

Effects of Conditioning Agents and Agronomic Measures on Cadmium Uptake by Rice in Polluted Rice Fields

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