Mineralization Characteristics of Soil Organic Carbon and Its Temperature Sensitivity in Wheat Field Under Film Mulching
CAO HanBing,1,2, XIE JunYu1,2, LIU Fei1, GAO JianYong1, WANG ChuHan1, WANG RenJie3, XIE YingHe1, LI TingLiang,1,*1College of Resources and Environment, Shanxi Agricultural University/State Key Laboratory of Sustainable Dryland Agriculture (in preparation), Taiyuan 030031 2Key Laboratory of Soil Environment and Nutrient Resources of Shanxi Province, Taiyuan 030031 3National Vegetable Quality Standards Center, Weifang 262700, Shandong;
Abstract 【Objective】Clarify the response of dryland soil organic carbon (SOC) mineralization to long-term film mulching and its temperature sensitivity, and further understand the transformation and stabilization mechanism of SOC, providing theoretical support for dryland soil fertility and crop productivity. 【Method】Based on the dryland wheat field mulching experiment that began in 2012 in the southeastern of the Loess Plateau, soil samples of 0-20 cm layer for different mulching cultivation modes (farmer’s practice fertilization (no film mulching), monitoring fertilization (no film mulching), monitoring fertilization plus ridge mulching-furrow planting (mulching), and monitoring fertilization plus whole field film (mulching)) were collected, and then the soil samples were incubated at different temperatures (15, 25 and 35℃). The lye absorption method was used to determine the SOC mineralization rate at the 1st, 3rd, 5th, 7th, 14th, 21st, 28th, 35th and 42th days after incubation, combined with two component model to fit the cumulative mineralization and decomposition rate of soil active and recalcitrant organic carbon pool, investigate the effect of film mulching on SOC mineralization characteristics and the response of SOC mineralization to temperature.【Result】The results showed that the increasing temperature had significantly increased SOC mineralization rate, cumulative mineralization and the mineralization amount of recalcitrant organic carbon pool (Cs), but markedly decreased the temperature sensitivity (Q10) and activation energy (Ea). The mineralization rate and cumulative mineralization of SOC at 25℃ and 35℃ were about twice that at 15℃, and the mineralization of Cs increased by 93.4% and 105.3% respectively compared with that at 15℃. But Q10 (25-35℃) is 19.3% lower than Q10 (15-25℃), and Ea (25-35℃) is 68.0% lower than Ea (15-25℃). Plastic film mulching significantly increased the SOC cumulative mineralization, the mineralization of Q10, Ea and Cs. Compared with farmer fertilization treatment, both monitoring fertilization plus ridge mulching-furrow planting and monitoring fertilization plus whole field film treatments had significantly increased the SOC cumulative mineralization by 26.5%-38.6% (25℃) and 27.8%-64.4% (35℃), respectively, while monitoring fertilization plus whole field film treatment had the largest improvement. The monitoring fertilization plus whole field film treatment had also significantly increased Q10 by 28.5% (15-25℃) and 25.8% (25-35℃) and Ea by 93.4% and 193.1%, respectively. Furthermore, monitoring fertilization plus whole field film treatment had markedly increased the mineralization amount of Cs by 115.8%-2 208.2%. 【Conclusion】Therefore, film mulching accelerated the SOC mineralization in the dryland wheat field of the Loess Plateau, especially for monitoring fertilization plus whole filed filming treatment mainly increased the mineralization of recalcitrant organic carbon pool, and then significantly increased the cumulative mineralization of SOC and its temperature sensitivity. Keywords:dryland;soil organic carbon mineralization;temperature sensitivity;recalcitrant organic carbon pool;monitoring fertilization plus whole filed filming
PDF (1152KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 曹寒冰, 谢钧宇, 刘菲, 高健永, 王楚涵, 王仁杰, 谢英荷, 李廷亮. 地膜覆盖麦田土壤有机碳矿化特征及其温度敏感性. 中国农业科学, 2021, 54(21): 4611-4622 doi:10.3864/j.issn.0578-1752.2021.21.011 CAO HanBing, XIE JunYu, LIU Fei, GAO JianYong, WANG ChuHan, WANG RenJie, XIE YingHe, LI TingLiang. Mineralization Characteristics of Soil Organic Carbon and Its Temperature Sensitivity in Wheat Field Under Film Mulching. Scientia Agricultura Sinica, 2021, 54(21): 4611-4622 doi:10.3864/j.issn.0578-1752.2021.21.011
常规施肥:Farmer’s practice fertilization (FP);测控施肥:Monitoring fertilization (MF);垄膜沟播:Monitoring fertilization plus ridge mulching-furrow planting (RF);平膜穴播:Monitoring fertilization plus whole filed filming (FH)。下同 The same as below Fig. 1Experimental site location and treatment
Table 4 表4 表4温度和覆膜处理下土壤有机碳累积矿化量的双因素方差分析 Table 4Two-factor variance analysis of cumulative SOC mineralization under temperature and film mulching measures
Table 6 表6 表6温度和覆膜处理下土壤有机碳库矿化参数的双因素方差分析 Table 6Two-factor variance analysis of SOC pool mineralization parameters under temperature and film mulching measures
变异来源 Source of variation
平方和 Sum of squares
自由度 Degree of freedom
均方 Mean square
F值 F value
P值 P value
Ca
温度 Temperature (T)
0.1316
2
0.0658
0.2249
0.8004
覆膜 Film mulching (F)
0.3592
3
0.1197
0.4091
0.7480
温度×覆膜 T×F
2.7988
6
0.4665
1.5941
0.1960
Ka
温度 Temperature (T)
0.0348
2
0.0174
0.4279
0.6572
覆膜 Film mulching (F)
0.0842
3
0.0281
0.6900
0.5678
温度×覆膜T×F
0.0341
6
0.0057
0.1395
0.9893
Cs
温度 Temperature (T)
20103.4300
2
10051.7100
18.4349
0.0001
覆膜 Film mulching (F)
15772.3800
3
5257.4620
9.6422
0.0003
温度×覆膜T×F
649.0932
6
108.1822
0.1984
0.9737
Ks
温度 Temperature (T)
0.0004
2
0.0002
4.4409
0.0240
覆膜 Film mulching (F)
0.0001
3
0.0000
0.6656
0.5821
温度×覆膜 T×F
0.0002
6
0.0000
0.6096
0.7201
Ca:活性有机碳库;Ka:活性有机碳库分解速率;Cs:惰性有机碳库;Ks:惰性有机碳库分解速率。下同 Ca: Active organic carbon pool; Ka: Decomposition rate of active organic carbon pool; Cs: Resistant organic carbon pool; Ks: Decomposition rate of resistant organic carbon pool. The same as below
Table 7 表7 表7长期不同覆膜处理下土壤有机碳库矿化参数 Table 7Mineralization parameters of soil organic carbon pool under long-term different film mulching measures
培养温度 Incubation temperature (℃)
矿化参数 Mineralization parameters
处理 Treatment
FP
MF
RF
FH
15
Ca (g·kg-1)
1.552
0.631
0.461
0.329
Ka (d-1)
0.300
0.392
0.301
0.242 a
Cs (g·kg-1)
2.319b
34.331a
40.624a
53.517aB
Ks (d-1)
0.0121A
0.0025
0.0119
0.0033
R2
0.981
0.990
0.988
0.995
25
Ca (g·kg-1)
0.773
0.775
1.008
0.994
Ka (d-1)
0.276
0.294
0.229
0.209
Cs (g·kg-1)
41.307b
82.268ab
72.154ab
103.473aA
Ks (d-1)
0.0003B
0.0004
0.0003
0.0002
R2
0.974
0.981
0.986
0.987
35
Ca (g·kg-1)
0.599
0.748
0.793
1.001
Ka (d-1)
0.434
0.354
0.262
0.245
Cs (g·kg-1)
50.893b
90.210ab
101.647a
109.849aA
Ks (d-1)
0.0011AB
0.0004
0.0003
0.0004
R2
0.972
0.990
0.988
0.992
同行数据后不同小写字母表示土壤惰性有机碳库的矿化量在不同处理间达5%显著水平。同列数据后不同大写字母表示FP处理中惰性有机碳库分解速率和FH处理中土壤惰性有机碳库的矿化量在不同温度间达5%显著水平 Values followed by different lowercase letters in the same row mean significant differences between treatments for cumulative mineralization of resistant organic carbon pool at 5% probability level. Values followed by different uppercase letters in the same column mean significant differences between temperatures for decomposition rate of resistant organic carbon pool under FP treatment and cumulative mineralization of resistant organic carbon pool under FH treatment at 5% probability level
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