秸秆还田下耕作方式对黑土活性有机碳组分及碳库管理指数的影响

doi:10.3864/j.issn.0578-1752.2024.17.008

Abstract

Abstract:

【Objective】Soil-related indicators were measured during the mature period of maize in 2020 and 2021. The purpose of this study was to investigate the effects of tillage methods with straw returning on soil labile organic carbon and carbon pool management index of black soil farmland at the southern foot of the Daxing’an mountains based on four consecutive years of tillage experiment.【Method】Seven treatments were set up in the tillage positioning experiment, including deep tillage with straw returning (DTS), deep loosening and shallow with straw returning (DSS), subsoiling tillage with straw returning (STS), heavy harrowing straw returning (SHS), rotary tillage with straw returning (RTS), and no-tillage straw returning (NTS), with shallow tillage without straw returning (CK). 0-60 cm surface soil was collected. The contents of labile organic carbon (R₃₃₃), medium labile organic carbon (R₁₆₇) and high labile organic carbon(R₃₃) were determined by potassium permanganate solution with different concentrations (0.333, 0.167 and 0.033 mol·L^-1), and the effects of different tillage methods on soil labile organic carbon content and carbon pool management index were studied.【Result】(1) Compared with CK, the R₃₃₃ content in 0-10 cm soil layer treated by DSS, DTS, NTS, RTS and STS significantly increased by 9.0% to 63.7% in two years, respectively. DSS was the highest, followed by DTS and NTS. R₃₃₃ in 10-60 cm soil layer, DTS, DSS and NTS significantly increased by 30.8%-134.5%, 14.1%-97.8% and 18.9%-63.0%, respectively (P<0.05). (2) Compared with CK, the medium labile organic carbon (R₁₆₇) of 0-10 cm soil layer under different tillage methods was significantly increased (P<0.05). The DSS treatment of R₁₆₇ content was the highest, with an increase of 37.3%- 101.0%, and the DTS treatment of 10-60 cm soil layer was the highest, with an increase of 44.8%-72.9%, showing DTS>DSS>NTS treatment. (3) Compared with CK, the R₃₃content in 0-10 cm soil layer was significantly increased by 13.8%-55.6% under DSS treatment (P<0.05). In 10-20 cm soil layer, R₃₃ content of DTS, DSS, STS, RTS and NTS treatment was significantly increased by 3.6%-29.3% (P<0.05), with DTS being the highest, followed by DSS. In 20-60 cm soil layer, R₃₃ under DTS, DSS and STS treatment was significantly increased (P<0.05), and the proportion was 68.1%-20.0%. (4) The inert organic carbon (IOC) of 0-10 cm soil layer under straw returning was significantly increased by 4.7%-21.8% (P<0.05). In 20-60 cm soil layer, DTS and DSS significantly increased by 5.3%-156.6% and 4.2%-138.8% compared with other treatments (P<0.05). (5) Compared with CK, DTS treatment significantly increased carbon pool activity and carbon pool activity index in 0-20 cm soil layer (P<0.05), and increased by 7.7%-44.8% and 7.7%-45.0%, and significantly increased by DTS, DSS, STS and RTS soil layer carbon pool index (P<0.05). DTS, DSS and NTS treatment significantly increased the carbon pool management index of 0-60 cm soil layer by 21.9%-140.9%, 4.9%-103.7%, 13.3%-62.0% (P<0.05). (6) In 0-60 cm soil layer, R₃₃₃, R₁₆₇, R₃₃ and IOC were positively correlated with organic carbon content, carbon pool activity index, bulk density and geometric mean diameter, but negatively correlated with total soil porosity (P<0.01). Increasing the content of active organic carbon could improve soil physical structure and enhanced aggregate stability. The IOC was positively correlated with maize yield and dry matter mass (P<0.01).【Conclusion】Comprehensive analysis shows that both deep tillage with straw returning (DTS) and deep loosening and shallow with straw returning (DDS) can increase soil labile organic carbon and inert organic carbon to a certain extent, and effectively improve the organic carbon pool of farmland.

Key words: straw returning, tillage method, black soil, labile organic carbon, inert organic carbon, carbon pool management index, maize yield, the southern foot of the Daxing’an mountains

LIU YaJie, ZHANG TianJiao, ZHANG XiangQian, LU ZhanYuan, LIU ZhanYong, CHENG YuChen, WU Di, LI JinLong. Effects of Tillage Methods Under Straw Returning on the Labile Organic Carbon Fractions and Carbon Pool Management Index in Black Soil Farmland[J].Scientia Agricultura Sinica, 2024, 57(17): 3408-3423.

Figures/Tables 9

Fig. 1

Table 1

Table 2

Experimental treatment"

处理 Treatments	操作方法 Operations
深翻秸秆还田（DTS） Deep tillage with straw returning	深翻深度30—35 cm，秸秆还田深度为5—30 cm。翌年春季重耙后进行播种 The depth of plowing is 30-35 cm, the depth of straw returning to the field is 5-30 cm, and the seeds are sown after heavy harrowing in the spring of the next year
深松浅翻秸秆还田（DSS） Deep loosening and shallow with straw returning	浅翻15—20 cm，深松25—30 cm，秸秆还田深度为2—15 cm。翌年春季重耙后播种 Shallow tillage to a depth of 15-20 cm, deep plowing to a depth of 25-30 cm, and incorporation of straw into the soil at a depth of 2-15 cm should be carried out. The seeds are sown after heavy harrowing in the spring of the next year
深松秸秆还田（STS） Subsoiling tillage with straw returning	深松25—30 cm，秸秆还田深度为0—8 cm。翌年春季重耙后播种 Subsoiling tillage to a depth of 25-30 cm, and straw returned to the field depth of 0-8 cm should be carried out. The seeds are sown after heavy harrowing in the spring of the next year
重耙秸秆还田（SHS） Heavy harrowing with straw returning	重耙两遍，重耙深度10—15 cm，秸秆还田深度为0—12 cm。春季常规播种 Heavy harrowing the soil twice to a depth of 10-15 cm, and the straw returned to a depth of 0-12 cm should be carried out. The seeds are conventionally sown in the spring
旋耕秸秆还田（RTS） Rotary tillage with straw returning	旋耕耙地两遍，旋耕深度10—15 cm，秸秆还田深度为0—12 cm。春季常规播种 Rotary tilling twice, rotary tillage depth of 10-15 cm, the straw returning depth of 0-12 cm should be carried out. The seeds are conventionally sown in the spring
免耕秸秆还田（NTS） No-tillage with straw returning	玉米秸秆均匀覆盖地表还田，秸秆还田深度为0—3 cm。春季免耕播种机播种 The straw are evenly covered on the surface and returned to the field, the straw is returned to the field depth of 0-3 cm, and the seeds are sown by no-tillage seeder in spring
浅翻秸秆不还田（CK） Shallow tillage without straw returning	玉米秸秆全部移除，浅翻土壤，深度17—22 cm。春季重耙，常规播种 All straw are removed. The soil is shallowly tillaged, which the depth was 17-22 cm. The heavy harrowing and conventional sowing are carried out in spring

Table 2

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Table 3

Effects of different tillage methods on soil carbon pool management index under straw returning condition"

处理 Treatment	土层 Soil depth (cm)	2020				2021
处理 Treatment	土层 Soil depth (cm)	碳库活度 Activity	碳库活度指数 Activity index	碳库指数 Carbon pool index	碳库管理指数 Carbon management index	碳库活度 Activity	碳库活度指数 Activity index	碳库指数 Carbon pool index	碳库管理指数 Carbon management index
DTS	0-10	0.21±0.00a	1.08±0.01a	1.13±0.01c	121.85±0.99b	0.23±0.01b	1.27±0.04b	1.13±0.00c	143.19±4.36c
	10-20	0.20±0.00b	1.11±0.04b	1.20±0.01b	133.08±3.60a	0.21±0.01a	1.45±0.05a	1.24±0.04b	179.51±0.22a
	20-40	0.20±0.01de	0.64±0.03e	2.09±0.04a	135.00±4.02b	0.17±0.01b	1.21±0.03b	1.75±0.03a	212.50±3.73a
	40-60	0.28±0.00c	0.69±0.01c	2.03±0.06a	139.17±1.70a	0.22±0.00a	1.14±0.04a	2.10±0.09a	240.85±15.29a
DSS	0-10	0.20±0.00b	1.04±0.01b	1.23±0.00a	127.39±1.24a	0.26±0.01a	1.44±0.02a	1.22±0.01a	174.65±2.13a
	10-20	0.17±0.00e	0.91±0.03e	1.24±0.00a	112.57±3.47b	0.17±0.00b	1.20±0.04b	1.32±0.03a	158.14±4.86b
	20-40	0.19±0.01e	0.61±0.03e	1.93±0.03b	117.10±5.84c	0.17±0.00b	1.22±0.05b	1.67±0.03b	203.70±9.94a
	40-60	0.26±0.02d	0.62±0.04d	1.69±0.05b	104.87±6.51cd	0.19±0.00b	0.96±0.02b	1.88±0.09b	180.99±8.64b
STS	0-10	0.20±0.01b	1.00±0.02c	1.09±0.01d	108.93±3.37d	0.21±0.00c	1.18±0.01c	1.08±0.00d	126.32±1.01d
	10-20	0.17±0.00de	0.95±0.05de	1.08±0.01d	102.54±4.29c	0.17±0.00b	1.18±0.06bc	1.19±0.04bcd	140.09±5.37c
	20-40	0.21±0.00d	0.69±0.01d	1.64±0.01c	114.09±0.70c	0.14±0.01c	0.96±0.03c	1.55±0.04c	148.21±2.28b
	40-60	0.29±0.01cd	0.69±0.02c	1.55±0.04c	106.45±1.01c	0.12±0.01d	0.61±0.05d	1.61±0.05c	97.76±7.26e
SHS	0-10	0.18±0.00c	0.90±0.02e	1.10±0.03cd	99.50±0.82e	0.18±0.00d	0.99±0.00d	1.08±0.00d	106.23±0.07e
	10-20	0.20±0.00bc	1.07±0.03bc	1.05±0.01e	112.08±1.51b	0.16±0.00c	1.09±0.05cd	1.14±0.03d	124.93±4.67d
	20-40	0.30±0.01bc	0.98±0.01bc	1.10±0.02e	107.01±3.05d	0.18±0.01b	1.29±0.05b	1.05±0.02e	135.53±3.85cd
	40-60	0.30±0.01c	0.72±0.02c	1.47±0.03c	104.91±1.23cd	0.12±0.00d	0.64±0.02d	1.51±0.10cd	97.18±4.09e
RTS	0-10	0.18±0.00c	0.94±0.01d	1.18±0.01b	110.76±0.47d	0.19±0.01d	1.05±0.05d	1.16±0.01b	121.80±5.47d
	10-20	0.16±0.01e	0.88±0.02e	1.15±0.00c	101.20±2.58c	0.12±0.00e	0.85±0.02e	1.22±0.02bc	104.11±1.49e
	20-40	0.29±0.00c	0.93±0.01c	1.29±0.01d	120.29±1.65c	0.15±0.00c	1.04±0.03c	1.23±0.01d	128.08±3.48d
	40-60	0.28±0.01cd	0.67±0.01cd	1.48±0.02c	99.32±3.24d	0.16±0.01c	0.85±0.05c	1.58±0.07cd	134.06±6.63d
NTS	0-10	0.20±0.00b	1.03±0.01b	1.13±0.03c	117.03±1.09c	0.25±0.01a	1.38±0.05a	1.12±0.01c	153.90±5.27b
	10-20	0.23±0.01a	1.24±0.04a	1.06±0.02de	130.88±1.88a	0.17±0.00b	1.21±0.06b	1.15±0.03cd	139.98±6.13c
	20-40	0.49±0.01a	1.59±0.02a	1.01±0.02f	160.73±0.65a	0.20±0.00a	1.39±0.06a	1.03±0.00e	143.24±6.25bc
	40-60	0.35±0.01b	0.84±0.03b	1.35±0.04d	113.31±0.93b	0.23±0.01a	1.18±0.01a	1.43±0.05d	167.98±5.22c
CK	0-10	0.20±0.00b	1.00±0.00c	1.00±0.00e	100.00±0.00e	0.18±0.00d	1.00±0.00d	1.00±0.00e	100.00±0.00e
	10-20	0.18±0.01cd	1.00±0.00cd	1.00±0.00f	100.00±0.00c	0.14±0.01d	1.00±0.00d	1.00±0.00e	100.00±0.00e
	20-40	0.31±0.00b	1.00±0.00b	1.00±0.00g	100.00±0.00e	0.14±0.00c	1.00±0.00c	1.00±0.00e	100.00±0.00e
	40-60	0.41±0.01a	1.00±0.00a	1.00±0.00e	100.00±0.00cd	0.19±0.01b	1.00±0.00b	1.00±0.00e	100.00±0.00e

Table 3

Fig. 6

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土层 Soil depth (cm)	pH	有机碳 Organic carbon (g·kg^-1)	碱解氮 Alkali hydrolysable nitrogen (mg·kg^-1)	速效磷 Available phosphorus (mg·kg^-1)	速效钾 Available potassium (mg·kg^-1)	全氮 Total nitrogen (g·kg^-1)	全钾 Total potassium (g·kg^-1)
0-10	8.0	33.3	40.7	47.9	62.7	2.0	34.5
10-20	8.0	30.0	35.0	22.3	41.3	1.9	31.8
20-40	8.1	22.7	32.6	7.7	38.7	1.4	25.4
40-60	8.3	13.3	14.7	10.4	32.2	0.7	19.8

Effects of Tillage Methods Under Straw Returning on the Labile Organic Carbon Fractions and Carbon Pool Management Index in Black Soil Farmland

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