辽西半干旱区不同类型地膜降解特性及其对玉米产量的影响

doi:10.3864/j.issn.0578-1752.2021.09.005

中国农业科学 ›› 2021, Vol. 54 ›› Issue (9): 1869-1880.doi: 10.3864/j.issn.0578-1752.2021.09.005

• 耕作栽培·生理生化·农业信息技术 • 上一篇下一篇

辽西半干旱区不同类型地膜降解特性及其对玉米产量的影响

冯晨^1,²(),冯良山^1,²,刘琪³,李昊儒³,郑家明^1,²,杨宁^1,²,白伟^1,²,张哲^1,²,孙占祥^1,²()

¹辽宁省农业科学院耕作栽培研究所,沈阳 110161
²国家农业环境阜新观测实验站,辽宁阜新 123100
³中国农业科学院农业环境与可持续发展研究所,北京 100081

收稿日期:2020-12-01 接受日期:2021-02-07 出版日期:2021-05-01 发布日期:2021-05-10
通讯作者: 孙占祥
作者简介:冯晨,E-mail：sandyla570521@126.com。
基金资助:
国家自然科学基金青年基金(41807388);辽宁省兴辽英才计划(XLYC1807056);辽宁省兴辽英才计划(XLYC1907089);辽宁省兴辽英才计划(XLYC1908013);国家公益性行业(农业科研专项201503105);辽宁省“百千万人才工程”项目(2018921005);辽宁省农业科学院学科交流合作项目(2020HZ062001);农业农村部农业科研杰出人才及其创新团队

The Degradation Characteristics of Different Plastic Films and Their Effects on Maize Yield in Semi-Arid Area in Western Liaoning

FENG Chen^1,²(),FENG LiangShan^1,²,LIU Qi³,LI HaoRu³,ZHENG JiaMing^1,²,YANG Ning^1,²,BAI Wei^1,²,ZHANG Zhe^1,²,SUN ZhanXiang^1,²()

¹Institute of Crop Cultivation and Farming System, Liaoning Academy of Agricultural Sciences, Shenyang 110161
²National Agricultural Experimental Station for Agricultural Environment, Fuxin 123100, Liaoning
³Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081

Received:2020-12-01 Accepted:2021-02-07 Online:2021-05-01 Published:2021-05-10
Contact: ZhanXiang SUN

摘要/Abstract

摘要：

【目的】明确不同类型可降解地膜在辽西半干旱区的降解特性及其对玉米产量的影响,为可降解地膜的区域筛选和应用提供理论依据和数据支撑。【方法】以国家农业环境阜新观测实验站为平台,采用田间试验与室内分析相结合的方法,田间试验共设置3个处理,分别为普通地膜覆盖（T1）、添加剂型降解膜覆盖（T2）和全生物降解膜覆盖（T3）。通过2年田间试验,定期进行田间观察和取样分析,测定不同地膜覆盖处理下的玉米产量,并结合扫描电镜（SEM）和傅里叶红外光谱（FTIR）,对地膜表面形态、力学特性以及化学结构等指标进行测定,系统全面地分析不同类型地膜在辽西半干旱区的降解过程及程度。【结果】各覆盖处理的玉米产量无显著差异,不同类型地膜的田间降解过程表明,2种可降解地膜的降解进程相似,均从覆盖后第38天表面开始出现裂纹,第58天开始出现明显降解,T3处理的降解进程总体上快于T2处理,普通地膜几乎无降解。随着地膜在田间置留时间加长,破碎程度加剧,可降解地膜的水蒸气透过量显著增加,力学性能（最大负荷、拉伸强度和断裂标称应变）显著下降,膜面微观形态和化学结构变化显著,普通地膜覆盖处理各项指标前后变化不明显。不同类型地膜的水蒸气透过能力总体表现为T3>>T2>T1,力学性能表现为T1>T2>T3,覆盖后98 d地膜微观表面粗糙度表现为T3>T2>T1,与田间观测效果及地膜相应物理指标结果相一致。通过计算（失重法）得出可降解地膜T2和T3的当季降解率分别为37.4%和47.8%,降解残片以<4 cm²和4—25 cm²的中小规格为主。【结论】可降解地膜可在保障玉米产量的同时实现自身降解,减少农田残留。从产量、降解特性和残留率等方面综合评价,以PBAT全生物降解地膜替代普通地膜应用于辽西半干旱区玉米覆盖栽培更具潜力。

关键词: 普通地膜, 可降解地膜, 产量, 降解特性, 残留率

Abstract:

【Objective】This study clarified the degradation characteristics of degradable mulching films and their effects on maize yield in semi-arid area in western Liaoning, which may provide a basis for regional screening and application of degradable plastic films. 【Method】A field study combined with laboratory analysis was conducted in National Agricultural Experimental Station for Agricultural Environment in Fuxin, with three treatments, including conventional plastic film mulching (T1), additive degradation film mulching (T2) and biodegradable film mulching (T3). Through 2 years of field experiment, the regular field observation and sampling analysis were carried out to determine the maize yield under different mulching treatments. By using scanning electron microscope (SEM) and fourier transform infrared spectroscopy (FTIR), the surface morphology, mechanical properties and chemical structure of the mulching film were measured. The degradation process and degree of different types of mulching film in semi-arid area in western Liaoning were systematically analyzed. 【Result】There was no significant difference in maize yield among different treatments, and T2 and T3 had similar degradation process, in which T2 and T3 all showed cracks from the 38th day after mulching and significant degradation from the 58th day after mulching. The degradation process under T3 treatment was generally faster than that under T2 treatment, while the conventional plastic film showed almost no degradation. As plastic film degraded, the water vapor transmittance of degradable plastic film increased significantly, while the mechanical properties (tensile load, tensile strength and elongation at break) decreased significantly. The micro-structure and chemical structure of plastic film surface changed remarkably, while these indexes of conventional plastic film did not change significantly. The water vapor transmission capacity of different plastic film was in the order of T3>>T2>T1, while the mechanical properties was in order of T1>T2>T3, and the change of micro-structure of plastic film on the 98th day after mulching was in the order of T3>T2>T1, which were consistent with the field observation results and the corresponding physical indexes of mulching film. The degradation rates under T2 and T3 were 37.4% and 47.8%, respectively. The small and medium sizes of 4 cm² and 4-25 cm² were predominant. 【Conclusion】Biodegradable plastic film mulching could guarantee maize yield, achieve self-degradation and reduce plastic film residue. In terms of yield, degradation characteristics and residual rate, PBAT biodegradable plastic film was more feasible to replace common plastic film for maize mulching cultivation in semi-arid areas in western Liaoning.

Key words: conventional plastic film, degradable plastic film, yield, degradation characteristics, residual rate

冯晨,冯良山,刘琪,李昊儒,郑家明,杨宁,白伟,张哲,孙占祥. 辽西半干旱区不同类型地膜降解特性及其对玉米产量的影响[J]. 中国农业科学, 2021, 54(9): 1869-1880.

FENG Chen,FENG LiangShan,LIU Qi,LI HaoRu,ZHENG JiaMing,YANG Ning,BAI Wei,ZHANG Zhe,SUN ZhanXiang. The Degradation Characteristics of Different Plastic Films and Their Effects on Maize Yield in Semi-Arid Area in Western Liaoning[J]. Scientia Agricultura Sinica, 2021, 54(9): 1869-1880.

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参考文献 36

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覆膜后天数 Days after mulching (d)	T1		T2		T3
覆膜后天数 Days after mulching (d)	裂纹数 Cracks (No./m²)	形态描述 Description	裂纹数 Cracks (No./m²)	形态描述 Description	裂纹数 Cracks (No./m²)	形态描述 Description
14	0	表面未见有明显变化 No obvious change on the surface	0	表面未见有明显变化 No obvious change on the surface	0	表面未见有明显变化 No obvious change on the surface
38	0	表面未见有明显变化 No obvious change on the surface	16	膜面完整,表面出现裂纹 Intact surface with cracks	11	膜面完整,表面出现裂纹 Intact surface with cracks
58	0	膜面完整,表面有细小机械损伤 Intact surface with minor physical damage	33	表面裂纹裂缝增多 Surface cracks increased	23	膜面变脆,出现大的裂纹裂缝 Brittle surface with cracks
98	0	膜面完整,表面有细小机械损伤 Intact surface with minor physical damage	>50	膜面强度明显下降,有大量裂纹裂缝,开始产生碎片 The strength of film decreased, surface with cracks and started to produce fragments	>50	膜面强度显著下降,已经产生碎片和大范围降解 The strength of film decreased, surface with fragmentation and degradation
118	0	膜面完整,表面有细小机械损伤 Intact surface with minor physical damage	>50	强度显著下降,膜面已成大量碎片 The strength of film decreased, surface has fragmented in large quantities	>50	强度显著下降,膜面已成大量碎片,部分已完全降解（肉眼不可见） The strength of film decreased, surface had fragmented in large quantities, completely degraded was found (invisible)

辽西半干旱区不同类型地膜降解特性及其对玉米产量的影响

The Degradation Characteristics of Different Plastic Films and Their Effects on Maize Yield in Semi-Arid Area in Western Liaoning

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覆膜后天数 Days after mulching (d)	T1				T2				T3
覆膜后天数 Days after mulching (d)	4 cm²	4-25 cm²	25-81 cm²	>81 cm²	4 cm²	4-25 cm²	25-81 cm²	>81 cm²	4 cm²	4-25 cm²	25-81 cm²	>81 cm²
14	0	0	0	1	0	0	0	1	0	0	0	1
38	0	0	0	1	0	0	0	1	0	0	0	2
58	0	0	0	1	4	4	2	4	1	7	4	5
98	0	0	0	1	18	9	2	4	9	12	3	5
118	0	1	1	1	23	9	5	5	44	19	12	5

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