Scientia Agricultura Sinica ›› 2023, Vol. 56 ›› Issue (16): 3140-3155.doi: 10.3864/j.issn.0578-1752.2023.16.008

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Spatial-Temporal Variation Characteristics of Wheat and Maize Stalk Resources and Chemical Fertilizer Reduction Potential of Returning to Farmland in Recent 30 Years in China

LIU ShuJun1,2(), LI DongChu1,2, HUANG Jing1,2, QU XiaoLin3, MA ChangBao3, WANG HuiYing3, YU ZiKun3, ZHANG Lu1,2, HAN TianFu1, LIU KaiLou4, SHEN Zhe1, ZHANG HuiMin1,2()   

  1. 1 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081
    2 Red Soil Experimental Station of Chinese Academy of Agricultural Sciences in Hengyang/National Observation and Research Station of Farmland Ecosystem in Qiyang, Hunan, Qiyang 426182, Hunan
    3 Cultivated Land Quality Monitoring and Protection Center, Ministry of Agricultural and Rural Affairs, Beijing 100125
    4 Jiangxi Institute of Red Soil and Germplasm Resources/Key Laboratory of Acidified Soil Amelioration and Utilization, Ministry of Agriculture and Rural Affairs, Nanchang 330046
  • Received:2022-09-07 Accepted:2022-11-03 Online:2023-08-16 Published:2023-08-18

Abstract:

【Objective】China has rich wheat and maize stalk resources. It is necessary to clarify the spatial-temporal characteristics of the wheat and maize stalk resources, the corresponding nutrient resources and chemical fertilizer reduction potential through stalk incorporation, which can provide decision basis for promoting the utilization of stalk resources and reducing chemical fertilizer application. 【Method】Based on the soil long-term monitoring data of the Ministry of Agriculture and Rural Affairs in wheat and maize planting areas of China from 1988 to 2019, this study analyzed the amount of wheat and maize stalk and its nutrient resources and fertilizer reduction potential through stalk incorporation in different years in each region of China. 【Result】The annual average amount of wheat and maize stalk resources reached 1.62×108 t and 4.23×108 t, respectively in 2010s, which were increased by 0.16×108 t and 2.04×108 t compared with 1990s, respectively. The annual average amount of wheat and maize stalk NPK resources reached 278.19×104 t and 901.08×104 t, respectively, which were increased by 27.97×104 t and 434.82×104 t compared with 1990s, respectively. Both of them increased most in North China (NC). The annual average amount of wheat stalk resources and NPK resources decreased first and then increased with planting years, while maize increased. In the first stage (1990s to 2000s) and the second stage (2000s to 2010s), the annual variation rate (AVR) of wheat stalk resources were -42.47×104 t·a-1 and 205.10×104 t·a-1, and the AVR of nutrient resources were -0.26×104 t·a-1 of N, -0.03×104 t·a-1 of P, -0.44×104 t·a-1 of K and 1.27×104 t·a-1 of N, 0.14×104 t·a-1 of P, and 2.11×104 t·a-1 of K, respectively. In the first stage and the second stage, the AVR of maize stalk resources were 397.82×104 t·a-1 and 1 643.60×104 t·a-1, and the AVR of nutrient resources were 3.46×104 t·a-1 of N, 0.56×104 t·a-1 of P, 4.46×104 t·a-1 of K and 14.30×104 t·a-1 of N, 2.30×104 t·a-1 of P, and 18.41×104 t·a-1 of K, respectively. There were more than 80% of wheat stalk and its nutrient resources distributed in NC and Middle and lower reaches of Yangtze River (MLRYR), with the highest in NC (0.93×108 t, 160.31×104 t of NPK), and the lowest in Southwest China (SW) (0.09×108 t, 16.05×104 t of NPK). About 70% of maize stalk and its nutrient resources were distributed in Northeast China (NE) and NC, with the highest in NE (1.39×108 t, 296.96×104 t of NPK), and the lowest in MLRYR (0.21×108 t, 44.40×104 t of NPK). The annual average nutrient-release amount of wheat stalk incorporation per unit area were 21.1 kg·hm-2 of N, 3.0 kg·hm-2 of P and 62.3 kg·hm-2 of K in China, with the highest in NC, and the lowest in SW. The annual average nutrient-release amount of maize stalk incorporation per unit area were 48.6 kg·hm-2 of N, 10.6 kg·hm-2 of P and 97.7 kg·hm-2 of K in China, with the highest in Northwest China (NW), and the lowest in SW. The annual average nutrient-release amount of wheat and maize stalk incorporation per unit area increased continually during 1988-2019. The proportion of wheat stalk returning nutrients to the annual chemical fertilizer application were 9.13%-10.82%, 4.26%-6.43% and 88.02%-111.86%, respectively, and that of maize stalk were 22.99%-24.37%, 16.04%-28.67% and 150.29%-171.95%, respectively. 【Conclusion】In general, using wheat and maize stalk properly could satisfy the basic potassium requirement for crop production and reduce the application of about 10%-20% nitrogen fertilizer and 5%-20% phosphorus fertilizer. Making full use of stalk resources was an important guarantee for reducing fertilizer application and increasing efficiency.

Key words: stalk resources, wheat, maize, temporal and spatial variation, chemical fertilizer reduction, China

Table 1

Region division in this study"

小麦 Wheat 玉米 Maize
区域
Region
监测点个数
Number of monitoring points
省、市、自治区
Provinces, cities and
autonomous regions
区域
Region
监测点个数
Number of
monitoring points
省、市、自治区
Provinces, cities and
autonomous regions
长江中下游
MLRYR
120 安徽、湖北、江苏、上海
Anhui, Hubei, Jiangsu, Shanghai
长江中下游
MLRYR
45 安徽、湖北、江苏、湖南
Anhui, Hubei, Jiangsu, Hunan
西南 SW 30 贵州、四川、重庆、云南
Guizhou, Sichuan, Chongqing, Yunnan
西南 SW
56 贵州、四川、重庆、云南
Guizhou, Sichuan, Chongqing, Yunnan
西北 NW 67 甘肃、宁夏、新疆、青海
Gansu, Ningxia, Xinjiang, Qinghai
西北 NW 100 甘肃、宁夏、新疆、内蒙古
Gansu Ningxia, Xinjiang, Inner Mengulia
华北 NC 215 北京、河北、河南、山东、山西、天津
Beijing, Hebei, Henan, Shandong, Shanxi, Tianjin
华北 NC 260 北京、河北、河南、山东、山西、天津
Beijing, Hebei, Henan, Shandong, Shanxi, Tianjin
东北 NE 204 黑龙江、吉林、辽宁
Heilongjiang, Jilin, Liaoning

Table 2

The yield per unit, cultivation area and fertilizer application rate of wheat and maize in different regions"

区域
Region
年代
Years
小麦单产
Wheat yield per unit
(kg·hm-2)
小麦播种面积
Wheat cultivation area (×107 hm2)
小麦施肥量
Fertilizer application rate of
wheat (kg·hm-2)
玉米单产
Maize yield per unit
(kg·hm-2)
玉米播种面积
Maize cultivation area (×107 hm2)
玉米施肥量
Fertilizer application rate
of maize (kg·hm-2)
N P K N P K
长江中
下游
MLRYR
1990s 5097.2 0.56 193.93 35.47 45.19 5846.5 0.16 284.20 88.08 89.79
2000s 5863.0 0.51 184.00 38.96 53.74 6506.1 0.18 238.00 28.48 55.55
2010s 6524.6 0.63 228.44 33.82 62.39 9029.9 0.27 249.27 32.48 71.13
西南
SW
1990s 4063.3 0.38 184.21 45.25 65.86 5455.4 0.38 162.05 28.43 41.76
2000s 3491.0 0.23 140.02 39.92 64.54 7318.2 0.37 177.66 34.57 53.51
2010s 4179.1 0.14 120.83 21.87 35.06 7593.9 0.48 223.88 31.94 62.86
西北
NW
1990s 6687.5 0.28 181.31 72.58 68.13 8087.9 0.26 169.89 67.67 30.63
2000s 7006.8 0.22 215.19 79.69 37.60 14329.0 0.31 230.36 88.23 41.20
2010s 7174.1 0.21 212.55 61.13 39.41 13073.8 0.60 259.04 58.71 47.21
华北
NC
1990s 6075.8 1.28 189.83 66.61 67.66 8335.4 0.83 142.17 74.36 70.86
2000s 7165.9 1.18 187.51 55.92 59.61 9009.4 0.97 188.10 40.28 51.60
2010s 7794.9 1.27 228.77 56.87 59.68 10391.0 1.32 219.92 35.30 52.93
东北
NE
1990s - - - - - 13666.0 0.64 159.58 39.28 31.11
2000s - - - - - 11780.5 0.77 149.17 38.93 46.99
2010s - - - - 12295.3 1.29 196.08 39.35 68.44
全国
CH
1990s 5536.7 2.50 188.38 56.48 57.70 8276.5 2.27 163.77 52.74 52.08
2000s 6439.4 2.15 184.83 52.83 57.28 9682.2 2.60 186.77 43.68 50.47
2010s 7195.0 2.25 222.66 48.56 59.00 10808.8 3.97 220.99 38.55 59.44

Fig. 1

The wheat and maize stalk resources in different regions"

Fig. 2

Temporal variation of wheat and maize stalk resources in different regions"

Table 3

The annual variation rate of wheat and maize stalk resources in different regions"

区域
Region
小麦 Wheat 玉米 Maize
1990s—2000s的年变化速率
Annual variation rate in 1990s-2000s(×104 t·a-1
2000s—2010s的年变化速率
Annual variation rate in 2000s-2010s(×104 t·a-1
1990s—2000s的年变化速率
Annual variation rate in 1990s-2000s(×104 t·a-1
2000s—2010s的年变化速率
Annual variation rate in 2000s-2010s(×104 t·a-1
长江中下游 MLRYR 24.95 94.56 26.78 128.10
西南 SW -63.22 -34.19 57.41 105.46
西北 NW -16.29 -1.02 206.72 331.41
华北 NC 12.09 145.75 207.91 434.66
东北 NE - - -101.00 643.97
全国 CH -42.47 205.10 397.82 1643.60

Fig. 3

The wheat and maize stalk nutrient in different regions"

Table 4

Temporal variation of annual average nutrient resources of wheat and maize stalk in different regions"

区域
Region
年代
Years
小麦秸秆养分量 Nutrients in wheat stalk (×104 t) 玉米秸秆养分量 Nutrients in maize stalk (×104 t)
N P K 合计Total N P K 合计Total
长江中下游
MLRYR
1990s 18.42±0.74 2.08±0.09 30.61±1.23 51.11±1.44 7.99±0.74 1.29±0.12 10.28±0.95 19.55±1.21
2000s 19.97±0.45 2.25±0.06 33.18±0.75 55.40±0.88 10.32±0.37 1.66±0.06 13.28±0.47 25.26±0.60
2010s 25.83±0.31 2.92±0.04 42.92±0.52 71.67±0.61 21.46±0.49 3.45±0.08 27.63±0.63 52.54±0.80
西南
SW
1990s 9.47±0.57 1.07±0.06 15.73±0.95 26.26±1.11 17.19±0.91 2.77±0.15 22.13±1.17 42.09±1.49
2000s 5.55±0.23 0.63±0.03 9.21±0.39 15.39±0.45 22.19±0.95 3.57±0.15 28.56±1.22 54.32±1.55
2010s 3.43±0.24 0.39±0.03 5.69±0.41 9.50±0.48 31.36±0.91 5.05±0.15 40.38±1.17 76.79±1.49
西北
NW
1990s 10.69±0.56 1.21±0.06 17.75±0.93 29.64±1.09 18.66±1.49 3.00±0.24 24.02±1.92 45.69±2.45
2000s 9.68±0.39 1.09±0.04 16.07±0.65 26.84±0.77 36.65±3.38 5.90±0.54 47.18±4.36 89.72±5.54
2010s 9.61±0.25 1.09±0.03 15.97±0.42 26.67±0.49 65.48±1.54 10.54±0.25 84.29±1.99 160.31±2.53
华北
NC
1990s 51.62±1.90 5.83±0.21 85.75±3.16 143.20±3.69 58.36±2.05 9.39±0.33 75.13±2.63 142.88±3.35
2000s 52.37±0.81 5.91±0.09 87.00±1.34 145.28±1.57 76.45±1.33 12.30±0.21 98.41±1.71 187.16±2.17
2010s 61.40±0.54 6.93±0.06 102.01±0.90 170.35±1.06 114.26±0.98 18.39±0.16 147.10±1.26 279.74±1.60
东北
NE
1990s - - - - 88.24±12.66 14.20±2.04 113.60±16.30 216.05±20.74
2000s - - - - 79.46±3.94 12.79±0.63 102.29±5.07 194.54±6.45
2010s - - - - 135.48±1.85 21.80±0.30 174.42±2.38 331.70±3.02
全国
CH
1990s 90.19±2.19 10.18±0.25 149.84±3.64 250.22±4.25 190.44±12.97 30.65±2.09 245.17±16.69 466.26±21.24
2000s 87.56±1.03 9.89±0.12 145.46±1.72 242.91±2.01 225.05±5.45 36.22±0.88 289.72±7.02 550.99±8.93
2010s 100.28±0.72 11.32±0.08 166.59±1.20 278.19±1.40 368.05±2.79 59.23±0.45 473.81±3.60 901.08±4.58

Table 5

The annual variation rate of wheat and maize stalk nutrient in different regions"

养分 Nutrient 区域
Region
小麦 Wheat 玉米 Maize
1990s—2000s的年变化速率
Annual variation rate in 1990s-2000s(×104 t·a-1
2000s—2010s的年变化速率
Annual variation rate in 2000s-2010s(×104 t·a-1
1990s—2000s的年变化速率
Annual variation rate in 1990s-2000s(×104 t·a-1
2000s—2010s的年变化速率
Annual variation rate in 2000s-2010s(×104 t·a-1
N
长江中下游
MLRYR
0.15 0.59 0.23 1.11
西南 SW -0.39 -0.21 0.50 0.92
西北 NW -0.10 -0.01 1.80 2.88
华北 NC 0.07 0.90 1.81 3.78
东北 NE - - -0.88 5.60
全国 CH -0.26 1.27 3.46 14.30
P
长江中下游
MLRYR
0.02 0.07 0.04 0.18
西南 SW -0.04 -0.02 0.08 0.15
西北 NW -0.01 -0.0007 0.29 0.46
华北 NC 0.01 0.10 0.29 0.61
东北 NE - - -0.14 0.90
全国 CH -0.03 0.14 0.56 2.30
K
长江中下游
MLRYR
0.26 0.97 0.30 1.43
西南 SW -0.65 -0.35 0.64 1.18
西北 NW -0.17 -0.01 2.32 3.71
华北 NC 0.12 1.50 2.33 4.87
东北 NE - - -1.13 7.21
全国 CH -0.44 2.11 4.46 18.41

Fig. 4

Nutrient-release amount of wheat and maize stalk incorporation in different regions Different lowercases indicate significantly difference (P<0.05); The solid line in the box represents the median value, □ Represents the average value, and · represents the abnormal value. The upper and lower line represent 75% and 25% confidence intervals, respectively. The upper and lower dots represent 95% and 5% confidence intervals, respectively"

Table 6

Temporal distribution of nutrient-release amount of wheat and maize stalk incorporation in different regions"

区域
Region
年代
Years
小麦秸秆还田的养分当季释放量
Nutrient-release amount of wheat stalk
incorporation (kg·hm-2)
养分当季释放量占化肥施用量的比例
Ratio of nutrient-release amount to fertilizer application (%)
玉米秸秆还田的养分当季释放量
Nutrient-release amount of maize stalk
incorporation (kg·hm-2)
养分当季释放量占化肥施用量的比例
Ratio of nutrient-release amount to fertilizer application (%)
N P K N P K N P K N P K
长江中下游
MLRYR
1990s 15.84±0.51c 2.21±0.07c 46.75±1.50c 8.17 6.24 103.45 27.49±1.59b 5.98±0.35b 55.29±3.21b 9.67 6.79 61.57
2000s 18.22±0.39b 2.54±0.05b 53.78±1.15b 9.90 6.53 100.06 30.59±0.97b 6.65±0.21b 61.52±1.96b 12.85 23.35 110.75
2010s 20.27±0.23a 2.83±0.03a 59.84±0.68a 8.87 8.37 95.92 42.45±0.94a 9.23±0.20a 85.39±1.89a 17.03 28.43 120.05
西南
SW
1990s 12.62±0.50a 1.76±0.07a 37.27±1.48 6.85 3.90 56.59 25.65±1.53b 5.58±0.33b 51.59±3.09b 15.83 19.62 123.55
2000s 10.85±0.52b 1.52±0.07b 32.02±1.54b 7.75 3.80 49.61 34.41±1.54a 7.48±0.33a 69.20±3.09a 19.37 21.64 129.32
2010s 12.98±0.64a 1.81±0.09a 38.33±1.89a 10.75 8.30 109.34 35.70±0.96a 7.76±0.21a 71.81±1.93a 15.95 24.31 114.23
西北
NW
1990s 20.78±1.24a 2.90±0.17a 61.34±3.67a 11.46 4.00 90.04 38.03±2.30b 8.27±0.50b 76.48±4.62b 22.38 12.22 249.71
2000s 21.77±0.88a 3.04±0.12a 64.27±2.61a 10.12 3.82 170.93 67.37±4.86a 14.65±1.06a 135.50±9.77a 29.25 16.61 328.85
2010s 22.29±0.61a 3.11±0.09a 65.80±1.81a 10.49 5.09 166.97 61.47±1.30a 13.37±0.28a 123.63±2.61a 23.73 22.77 261.84
华北
NC
1990s 18.88±0.65c 2.64±0.09c 55.73±1.92c 9.94 3.96 82.36 39.19±1.61b 8.52±0.35b 78.82±3.24b 27.57 11.46 111.23
2000s 22.26±0.34b 3.11±0.05b 65.73±1.01b 11.87 5.56 110.27 42.36±0.72b 9.21±0.16b 85.19±1.45b 22.52 22.87 165.09
2010s 24.22±0.19a 3.38±0.03a 71.50±0.56a 10.59 5.95 119.81 48.85±0.85a 10.62±0.19a 98.26±1.72a 22.21 30.09 185.65
东北
NE
1990s - - - - - - 64.25±5.89a 13.97±1.28a 129.23±11.84a 40.26 35.57 415.43
2000s - - - - - - 55.39±2.06b 12.04±0.45b 111.40±4.14b 37.13 30.94 237.06
2010s - - - - - - 57.81±0.83ab 12.57±0.18ab 116.27± 1.67ab 29.48 31.95 169.89
全国
CH
1990s 17.20±0.40c 2.40±0.06c 50.78±1.19c 9.13 4.26 88.02 38.91±1.45c 8.46±0.32c 78.26±2.92c 23.76 16.04 150.29
2000s 20.01±0.26b 2.80±0.04b 59.06±0.77b 10.82 5.29 103.11 45.52±0.85b 9.90±0.18b 91.56±1.70b 24.37 22.66 181.42
2010s 22.35±0.15a 3.12±0.02a 65.99±0.45a 10.04 6.43 111.86 50.82±0.50a 11.05±0.11a 102.21±1.01a 22.99 28.67 171.95
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