Film Mulching During Different Periods: Effects on Carbon Fixation and Carbon Balance of Maize Field in Aealian Semi-arid Region

doi:10.11924/j.issn.1000-6850.casb20191000714

Abstract

Abstract:

The paper aims to determine the mulching effect of carbon fixation and emission reduction in aealian semi-arid region and to provide a theoretical basis for constructing a low-carbon mulching pattern by comparing the effects of cultivating maize under 3 patterns of autumn mulching (AM), spring mulching (SM) and no mulching (NM) on the differences of short-term soil organic carbon storage and carbon balance. The results showed that: AM significantly increased the grain yield, aboveground biomass of maize and the root biomass of maize in 0-60 cm soil depth (P<0.05); in the 0-100 cm soil layer, the soil organic carbon storage of NM, SM, AM and initial was 89.2, 84.2, 83.7 and 90.53 Mg/hm², respectively, and there was no significant difference at the same soil layer (P>0.05); the average of soil respiration CO₂-C release of NM, SM and AM was 2.10, 2.09, 2.37 Mg/(hm²·a), respectively, and their carbon balance was -522, -498, -474 kg CO₂-C/(hm²·a), respectively. In conclusion, AM increases the carbon input of the system as well as the carbon emission of soil respiration, however, it will not cause the decline of soil organic carbon pool in the short term, and can reduce the carbon emission per unit area yield to a greater extent. So, AM is a climate-friendly low-carbon agricultural technology.

Key words: autumn film mulching, maize, organic carbon, soil respiration, carbon balance

CLC Number:

S158.1

Zhang Zhe, Si Pengfei, Zhang Xu, Feng Liangshan, Dong Wenyi, Liu Enke, Feng Chen, Zhang Yanqing, Sun Zhanxiang. Film Mulching During Different Periods: Effects on Carbon Fixation and Carbon Balance of Maize Field in Aealian Semi-arid Region[J]. Chinese Agricultural Science Bulletin, 2020, 36(30): 40-48.

Figures/Tables 9

References 34

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内容	处理	具体操作
整地	3个处理一致	10月初将所有小区地膜移除,利用小型旋耕机灭茬统一整地,旋耕深度20 cm
覆膜	AM	秋季整地后,肥料一次性施入,并进行覆膜
	SM	春季播种前,肥料一次性施入,并进行覆膜
	NM	春季播种前,肥料一次性施入,不覆膜
播种	3个处理一致	2014年4月26日;2015年4月28日
收获	3个处理一致	2014年9月22日;2015年9月24日

内容	处理	具体操作
整地	3个处理一致	10月初将所有小区地膜移除,利用小型旋耕机灭茬统一整地,旋耕深度20 cm
覆膜	AM	秋季整地后,肥料一次性施入,并进行覆膜
	SM	春季播种前,肥料一次性施入,并进行覆膜
	NM	春季播种前,肥料一次性施入,不覆膜
播种	3个处理一致	2014年4月26日;2015年4月28日
收获	3个处理一致	2014年9月22日;2015年9月24日

农业投入	单位	CO₂排放系数/(kg CO₂-C/kg)
氮肥^[25]	kg N	2.10
磷肥^[25]	kg P₂O₅	0.22
钾肥^[25]	kg K₂O	0.14
农药^[25]	kg	4.99
地膜^[21]	kg	5.18
燃油^[25]	kg	0.92

农业投入	单位	CO₂排放系数/(kg CO₂-C/kg)
氮肥^[25]	kg N	2.10
磷肥^[25]	kg P₂O₅	0.22
钾肥^[25]	kg K₂O	0.14
农药^[25]	kg	4.99
地膜^[21]	kg	5.18
燃油^[25]	kg	0.92

年份	处理	籽粒产量	地上部生物量	0~60 cm土层根系生物量
2014	NM	12470±363.1b	27772±175.4b	4933±143.1b
	SM	12024±312.7b	27340±349.5b	5396±165.8ab
	AM	14280±330.3a	31744±291.1a	5734±131a
2015	NM	6850±303.2c	15984±376.9c	3691±121c
	SM	10940±239.0b	24588±270.6b	4728±127.2b
	AM	12120±300.5a	28536±647a	5741±124.9a