000			00595nab|a22002177a|4500
999			_c64148 _d64140
001			64148
003			MX-TxCIM
005			20210902155906.0
008			201209s2021||||xxk|||p|op||||00||0|eng|d
022			_a2045-2322
024	8		_ahttps://doi.org/10.1038/s41598-021-84697-6
040			_aMX-TxCIM
041			_aeng
100	0		_aShuqing Zheng _922633
245	1	0	_aResponse of the chemical structure of soil organic carbon to modes of maize straw return
260			_aLondon (United Kingdom) : _bNature Publishing Group, _c2021.
500			_aPeer review
500			_aOpen Access
520			_aElucidating the chemical structure of soil organic matter (SOM) is important for accurately evaluating the stability and function of SOM. Aboveground vegetation directly affects the quantity and quality of exogenous organic matter input into the soil through plant residues and root exudates, which in turn affects soil microbial species, community structure, and activity, and ultimately impacts the chemical structure of SOM. In this study, a 13C nuclear magnetic resonance technique was used to analyze the chemical structure characteristics of soil organic carbon (SOC) under various rates of straw returning combined with rotary tillage and under full straw mulching. The results showed that full straw returning with rotary tillage and full straw mulching more effectively increased the SOC content than reduced rate of straw returning (1/2 and 1/3 of full straw) with rotary tillage. The contents of alkyl C and alkoxy C in the functional groups of SOC under various straw returning treatments were increased compared with those under the treatment of maize stubble remaining in soil (CK). Furthermore, the contents of aromatic C and carboxyl C were decreased, which were consistent with the chemical shift changes of SOC. Compared with CK treatment, straw returning decreased the content of aromatic C in the functional groups of SOC, but increased the content of alkoxy C, which could be associated with the change in integral areas of absorption peaks of alkyl C and alkoxy C moving toward left and right, respectively. The content of total SOC was significantly positively (P < 0.05) correlated with that of alkoxy C and significantly negatively (P < 0.01) correlated with that of aromatic C. The molecular structure of SOC tends to be simplified due to the decreasing in refractory C and the increasing in easily decomposed C after straw returning to the field.
546			_aText in English
650		7	_aSoil Organic Carbon _2AGROVOC _99067
650		7	_aMaize straw _2AGROVOC _922634
650		7	_aAgroecology _2AGROVOC _93995
650		7	_aCarbon cycle _2AGROVOC _95003
700	0		_aJiuming Zhang _922635
700	0		_aFengqin Chi _922636
700	0		_aBaoku Zhou _922637
700	0		_aDan Wei _922638
700	0		_aEnjun Kuang _922639
700	0		_aYu Jiang _922640
700	0		_aGang Mi _922641
700	0		_aYu ping Chen _922642
773	0		_gv. 11, art. 6574 _dLondon (United Kingdom) : Nature Publishing Group, 2021. _x2045-2322 _tNature Scientific Reports _wa58025
856	4		_yClick here to access online _uhttps://doi.org/10.1038/s41598-021-84697-6
942			_cJA _n0 _2ddc