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,冯良山,刘琪,李昊儒,郑家明,杨宁,白伟,张哲,孙占祥

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

FENG Chen,FENG LiangShan,LIU Qi,LI HaoRu,ZHENG JiaMing,YANG Ning,BAI Wei,ZHANG Zhe,SUN ZhanXiang

表2 不同类型地膜地表覆盖部分碎片化过程形态描述

Table 2 Morphological description of fragmentation process of different plastic films

覆膜后天数 Days after mulching (d) T1 T2 T3 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)