Effect of Long-term Straw Returning on Soil Organic Carbon Fractions Composition in Rice-Wheat Rotation Ecosystem

doi:10.13304/j.nykjdb.2020.0545

Abstract

Abstract:

In order to study the effect of long-term straw returning on content of soil organic carbon （SOC） in Taihu Lake rice-wheat rotation region， based on 10 years field positioning experiments， 4 treatments were set including no rice straw+all wheat straw returning （W）， all rice straw+no wheat straw returning （R）， half of rice straw and wheat straw returning （HRW） and all rice straw and wheat straw returning （ARW）， and no straw returning was control （CK）. The contents and components of SOC in different treatments were determined. The results showed that straw types and returning amounts significantly influenced the contents and compositions of SOC in rice-wheat rotation system. Compared with 2007， the growth rates of SOC， heavy fraction organic carbon （HFOC） and light fraction organic carbon （LFOC） were 0.18~0.46， 0.15~0.42 and -0.03~0.02 g·kg^-1·a^-1， respectively； the content of SOC and HFOC significantly increased in R， HRW and ARW treatments， and the carbon contents in light fraction organic matter （LFOM-C） decreased significantly in all treatments， which the decreased range of ARW treatment was more than other treatments. HFOC was the main component and accounted for more than 80% of SOC in all treatments， which the proportions of HFOC increased in W and HRW and decreased in CK， R and ARW treatments. Straw returning reduced the relationship between rice yield and the contents of SOC or components， and LFOC had more influence on rice yield than HFOC. In conclusion， all amount of rice and wheat straw returning could increase the content and stability of SOC， which could be considered as an ideal straw returning model in Taihu Lake region.

Key words: straw returning, soil organic carbon, carbon fraction, yield, rice-wheat ratation ecosystem

摘要：

为研究长期秸秆还田对太湖地区稻麦轮作土壤有机碳（soil organic carbon， SOC）含量的影响，依托10 a田间定位试验，以无秸秆还田为对照（CK），设置稻秸秆不还田+麦秸秆全量还田（W）、稻秸秆全量还田+麦秸秆不还田（R）、稻麦秸秆均半量还田（HRW）、稻麦秸秆均全量还田（ARW）4个秸秆还田处理，分析5种处理下SOC含量及其组分构成。结果表明，秸秆类型和还田量对SOC含量及其组分有显著影响。与2007年相比，2017年各处理SOC、重组分有机碳（heavy fraction organic carbon，HFOC）和轻组分有机碳（light fraction organic carbon，LFOC）含量的增速分别为0.18~0.46、0.15~0.42和-0.03~0.02 g·kg^-1·a^-1；R、HRW和ARW处理下SOC和HFOC含量显著增加；所有处理轻组分有机质中的碳含量均显著下降，其中，ARW处理的降幅最大；HFOC占比均大于80%，是SOC的主要组分，其中，W和HRW处理HFOC占比增加，其他处理HFOC占比下降；秸秆还田降低了SOC及其组分含量与水稻产量的相关性，LFOC对水稻产量影响更大。综上所述，稻麦秸秆均全量还田可增加SOC含量及稳定性，是太湖地区较为理想的秸秆还田模式。

关键词: 秸秆还田, 土壤有机碳, 碳组分, 产量, 稻麦轮作区

CLC Number:

S318

Linlin DONG, Jinfang ZHA, Mingxing SHEN, Haihou WANG, Linlin SHI, Yueyue TAO, Xinwei ZHOU, Changying LU. Effect of Long-term Straw Returning on Soil Organic Carbon Fractions Composition in Rice-Wheat Rotation Ecosystem[J]. Journal of Agricultural Science and Technology, 2022, 24(3): 166-175.

董林林, 查金芳, 沈明星, 王海候, 施林林, 陶玥玥, 周新伟, 陆长婴. 长期秸秆还田对稻麦轮作区土壤有机碳组分构成的影响[J]. 中国农业科技导报, 2022, 24(3): 166-175.

Figures/Tables 10

Fig. 1 Soil organic carbon content under different treatmentsNote： Different English letters indicate significant differences between 2007 and 2017 of the same treatment at P<0.05 level； different Greek letters indicate significant differences between different treatments in same year at P<0.05 level.

Fig. 2 Variation of soil organic carbon under different treatmentsNote： Different lowercase letters indicate significant differences between different treatments at P<0.05 level.

Table 1 Composition of soil organic carbon components under different treatments

处理 Treatment	LFOC /%		HFOC /%
处理 Treatment	2007	2017	2007	2017
CK	11.44±2.16 aα	15.69±4.56 aβ	88.56±2.16 aα	84.31±4.56 aαβ
W	11.92±0.65 aα	10.96±1.67 aαβ	88.08±0.65 aα	89.00±1.67 aβ
R	10.22±0.71 aα	11.36±2.18 aαβ	89.78±0.71 aα	88.64±2.18 aαβ
HRW	14.25±3.54 aα	13.70±2.88 aαβ	85.75±3.54 aα	86.30±2.88 aαβ
ARW	11.47±1.79 bα	17.37±1.62 aα	93.41±3.33 aα	82.63±1.62 bα

Fig. 3 LFOC and LFOM?C content under different treatmentsNote： Different English letters indicate significant differences between 2007 and 2017 of the same treatment at P<0.05 level； different Greek letters indicate significantly differences between different treatments in same year at P<0.05 level.

Fig. 4 Variation of LFOC under different treatmentsNote： Different lowercase letters indicate significant differences between different treatments at P<0.05 level.

Fig. 5 HFOC content under different treatmentsNote： Different English letters indicate significant differences between 2007 and 2017 of the same treatment at P<0.05 level； different Greek letters indicate significantly differences between different treatments in same year at P<0.05 level.

Fig. 6 Variation of HFOC under different treatmentsNote： Different lowercase letters indicate significant differences between different treatments at P<0.05 level.

Fig.7 Relationship between the contents of soil organic carbon and its fractionsNote：X1 and Y1represent data of 2007；X2 and Y2 represent data of 2017.

Table 2 Rice yield under different treatments

处理Treatment	千粒重 Thousand seed weight/g		结实率 Seed setting rate/%		产量 Yield/（t·hm^-2）
处理Treatment	2007	2017	2007	2017	2007	2017
CK	24.9±0.13 aα	25.9±0.03 aα	91.1±2.73 aα	82.4±2.99 aα	8.5±0.36 aα	8.8±0.32 aαβ
W	25.8±0.49 aα	26.0±0.04 aα	93.6±2.26 aα	84.2±4.43 aα	8.5±0.26 aα	8.0±0.10 bβ
R	25.5±0.20 aα	26.0±0.20 aα	95.4±1.34 aα	79.3±3.42 aα	8.1±0.17 aα	8.90±0.23 aαβ
HRW	25.2±0.17 aα	26.0±0.03 aα	92.8±1.29 aα	81.2±3.27 aα	8.4±0.17 aα	8.53±0.13 bαβ
ARW	24.8±0.56 aα	25.7±0.20 aα	94.6±0.31 aα	76.7±1.82 aα	8.1±035 aα	9.03±0.25 aα

Fig.8 Relationship between the content of soil organic carbon fractions and rice yieldNote：XL， XH and XSrepresent contents of LFOC， HFOC and SOC， YL， YH and YS represent fitting data of rice yield from LFOC， HFOC and SOC.

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