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1 土壤 (Soils), 2016, 48(6): DOI: /j.cnki.tr 水热对三峡水库消落带退耕稻田土壤有机碳矿化的影响 ,2* 1 1,2 ( ) (SOC) 3 ( ) 4 (40% (WHC) 70%WHC 100%WHC ) 66 (10 ~ 30 ) 70%WHC 100%WHC SOC 10 40%WHC 70%WHC 100%WHC (P<0.05) %WHC 70% WHC 40%WHC SOC (100%WHC ) SOC SOC Q %WHC 70%WHC 100%WHC SOC 100%WHC SOC SOC S (Soil organic carbon SOC) [1] SOC SOC [2 3] SOC [4] SOC [2] [5] SOC SOC [6] SOC SOC [7 8] [9] 14 C SOC ( )SOC SOC [10] SOC [11] SOC 30 m( 145 ~ 175 m) km km % SOC SOC SOC ( )(2014FY110200A13) (XDA ) (XDJK2013B043) * (cien777@163.com) (1992 ) tangjiang253767@163.com

2 ( E N 165 m) 2003 S 0 ~ 10 cm (4 ) SOC g/kg 1.33 g/kg 1.38 g/kg g/kg mg/kg ph 7.88(<2 μm) g/kg g 2 mm 300 ml 60% (WHC) %WHC 70%WHC 100%WHC ( 2.. 1) M1 M2 M3 M T1 T2 T ml (Agilent 7820A) CO 2 20 min SOC 1.3 (Q 10 ) (Q 10 ) 10 SOC [12] Q R / R 10 ( tt, 10) ( tt, ) Q 10 R (t, T+10) R (t, T) t (T+10) T SOC Q 10 (10~20 ) 10 ~ 20 SOC Q 10 Q 10 (20~30 ) 20 ~ 30 SOC Q SOC [13] kt ht Ct C0 (1 e ) Cs (1 e ) C t t(d) (mg/kg) C 0 k SOC (g/kg) (d 1 ) C s h SOC (g/kg) (d 1 ) 1.5 SOC [14] ph [15] 1.6 Excel 2010 SPSS19.0 SOC (LSD)(P<0.05) SOC 0 ~ ~ ~ 66 SOC 1 SOC 40%WHC SOC %WHC SOC

3 ( T1 T2 T M1 M2 M3 M4 40%WHC 70%WHC 100%WHC P<0.05 ) Fig. 1 图 1 不同水热条件下消落带退耕稻田土壤有机碳矿化特征 Organic carbon mineralization characteristics of abandoned paddy soils in hydro-fluctuation belts under different soil moistures and temperatures 30 70%WHC SOC (0 ~ 66 ) 10 40%WHC SOC 70%WHC 100%WHC (P<0.05) mg/kg %WHC SOC 70%WHC 100%WHC mg/kg mg/kg(0 ~ 10 ) 10 SOC mg/kg (P<0.05) ~ ~ 66 0 ~ 66 SOC SOC SOC (0 ~ 17 ) SOC SOC 33.45% ~ 68.66% 49.44% ~ 75.01% 55.53% ~ 66.54% SOC SOC (P>0.05) ( 1) 表 1 水热对消落带退耕稻田土壤有机碳累积矿化量影响的方差分析 Table 1 Variance analyses of soil moisture and temperature on cumulative amount of organic carbon mineralization of abandoned paddy soil in hydro-fluctuation belt F P < < P<0.05

4 ~ 20 Q 10 Q 10 (10~20 ) %WHC (P<0.05) 70%WHC 100%WHC 20 ~ 30 Q 10 (20~30 ) Q 10 (10~20 ) Q 10 (20~30 ) Q 10 (10~20 ) Q 10 (20~30 )(P<0.05) 100% Q 10 (10~20 ) Q 10 (20~30 ) 2.3 SOC (P<0.01) 2 C 0 T1M3> T1M2>T1M4>T1M1 T2M2>T2M3>T2M4>T2M1 T3M4>T3M2>T3M3>T3M1 10 SOC ~ mg/kg ~ mg/kg ~ mg/kg 2 SOC k T1M4 T2M4 T3M4 k C 0 /C 66 C 0 /C % ~ 64.75% 58.04% ~ 69.10% 49.55% ~ 56.12% SOC SOC 30% ~ 40% 10 C 0 /SOC %WHC 100%WHC C 0 /SOC 40%WHC (P<0.05)h 图 2 不同水分条件下消落带退耕稻田土壤有机碳矿化的温度敏感性 Fig. 2 Temperature sensitivities of organic carbon mineralization of abandoned paddy soils in hydro-fluctuation belts under different moisture conditions 表 2 不同水热条件下消落带退耕稻田土壤有机碳矿化的动力学参数 Table 2 Kinetic parameters for organic carbon mineralization of abandoned paddy soils under different soil moistures and temperatures C 0 (mg/kg) k(d 1 ) h( 10 5 d 1 ) C 0 /C 66 (%) C 0 /SOC( ) T1M ± 4.03 e ± bc 2.73 ± 0.28 c ± 1.71 a 1.84 ± 0.27 e T1M ± 6.07 de ± cd 2.85 ± 0.16 c ± 2.96 a 3.23 ± 0.41 de T1M ± 4.16 de ± cd 2.48 ± 0.15 c ± 1.36 a 3.45 ± 0.28 de T1M ± 6.25 e ± e 3.01 ± 0.62 a ± 5.06 a 1.96 ± 0.43 e T2M ± 2.04 de ± bc 2.73 ± 0.28 c ± 2.45 a 3.56 ± 0.14 de T2M ± abc ± bc 5.01 ± 0.75 bc ± 2.29 a 6.24 ± 0.71 abc T2M ± 7.41 abc ± cd 6.47 ± 1.32 abc ± 5.47 a 6.01 ± 0.50 abc T2M ± 9.26 cd ± e 8.01 ± 3.82 abc ± a 4.67 ± 0.63 cd T3M ± 5.18 bcd ± ab 6.31 ± 0.71 abc ± 1.39 a 4.93 ± 0.35 bcd T3M ± 3.59 ab ± a ± 0.86 a ± 6.27 a 6.93 ± 0.24 ab T3M ± 6.36 ab ± ab ± 0.76 ab ± 1.44 a 6.84 ± 0.43 ab T3M ± a ± de 8.94 ± 1.13 abc ± 5.98 a 7.27 ± 0.96 a 1)C 0 k h C C 0 /C 66 C 0 /SOC 2) (P<0.05) 3 (10 ~ 30 ) 40%WHC SOC 70%WHC 100%WHC SOC 70%WHC 70% WHC 40%WHC SOC

5 [10] CO 2 100%WHC SOC [16 19] [20 22] SOC [23 25] SOC 70%WHC Q 10 (10~20 ) Q 10 (20~30 )(P<0.05) 100% Q 10 (10~20 ) Q 10 (20~30 ) SOC [26] 10 40%WHC %WHC (P<0.05) 40%WHC SOC (10 ) (30 ) CO 2 SOC [27] SOC [2] Q 10 Leifeld [27] SOC 4 1) (66 ) 70%WHC 40%WHC SOC (100%WHC ) SOC 10 ~ 30 SOC SOC 2) SOC SOC 100%WHC [1],,. [J]., 2010, 24(5): [2] Davidson E A, Janssens I A. Temperature sensitivity of soil carbon decomposition and feedbacks to climate change[j]. Nature, 2006, 440(7081): [3],,,. [J]., 2016, 53(3): [4],,,. / [J]., 2013, 32(4): [5] Leirós M C, Trasar-Cepeda C, Seoane S, et al. Dependence of mineralization of soil organic matter on temperature and moisture[j]. Soil Biology and Biochemistry, 1999, 31(3): [6],,,. [J]., 2016, 48(1): 1 7 [7] Devêvre O C, Horwáth W R. Decomposition of rice straw and microbial carbon use efficiency under different soil temperatures and moistures[j]. Soil Biology and Biochemistry, 2000, 32(32): [8],,,. [J]., 2007, 13(6): [9],,,. [J]., 1998, 35(4): [10],,,. [J]., 2013, 33(20): [11],,.

6 [J]., 2008, 27(1): [12] Reichstein M, Bednorz F, Broll G, et al. Temperature dependence of carbon mineralization: conclusions from a long-term incubation of subalpine soil samples[j]. Soil Biology and Biochemistry, 2000, 32(7): [13] Ouyang X J, Zhou G Y, Huang Z L, et al. Effect of N and P addition on soil organic C potential mineralization in forest soils in South China [J]. Journal of Environmental Sciences, 2008, 20(9): [14] Vance E D, Brooks P C, Jenkinson D S. An extraction method for measuring soil microbial biomass C[J]. Soil Biology and Biochemistry, 1987, 19(6): [15]. [M]. :, 1978: [16],,. [J]., 2007, 38(5): [17],,,. [J]., 2008, 19(9): [18],,,. 14 C [J]., 2006, 39(3): [19],,,. [J]., 2012, 45(2): [20] Sahrawat K L. Organic matter accumulation in submerged soils[j]. Advances in Agronomy, 2003, 81(3): [21],,,. [J]. (), 2015, 39(2): [22],,,. [J]., 2009, 30(1): [23] Yang Q P, Xu M, Liu H S, et al. Impact factors and uncertainties of the temperature sensitivity of soil respiration[j]. Acta Ecologica Sinica, 2011, 31(8): [24],,,. [J]., 2013, 45(3): [25] Liu Y P, Tang Y P, Lu Q, et al. Effects of temperature and land use change on soil organic carbon mineralization[j]. Journal of Anhui Agriculture Sciences, 2011, 39(7): [26],,. [J]., 2014, 51(2): [27] Leifeld J, Fuhrer J. The temperature response of CO 2 production from bulk soils and soil fractions is related to soil organic matter quality[j]. Biogeochemistry, 2005, 75(3):

7 Effects of Soil Moisture and Temperature on Organic Carbon Mineralization of Abandoned Paddy Soil in the Hydrofluctuation Belt of the Three Gorges Reservoir TANG Jiang 1, DING Changhuan 1, FAN Jingjing 1, LIAN Maoshan 1, CI En 1,2*, WANG Zifang 1, XIE Deti 1,2 (1 College of Resources and Environment, Southwest University, Chongqing , China; 2 Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing , China) Abstract: An incubation experiment was conducted in the laboratory to investigate the effects of soil moisture and temperature on soil organic carbon (SOC) mineralization of abandoned purple paddy soil in the hydro-fluctuation belt of the Three Gorges Reservoir. Three incubation temperatures (10, 20 and 30 ) and four moisture levels (40% water holding capacity (WHC), 70%WHC, 100%WHC and shallow submerged condition) were designed in the experiment. The results showed that: 1) During the entire incubation period (66 d), there were no significant differences in SOC cumulative mineralization amounts among 70%WHC, 100%WHC and shallow submerged conditions at the three temperatures (10 30 ). At 10 incubation, SOC cumulative mineralization amount at 40%WHC treatment was significantly lower than those of 70%WHC and 100%WHC treatments (P<0.05), but there was no significant difference between shallow submerged and 40%WHC conditions. SOC cumulative mineralization amounts of 40%WHC treatments at 20 and 30 incubation were significantly lower than those of other treatments. So, it indicated that compared to 70%WHC treatment, 40% WHC treatment had negative-effects on SOC cumulative mineralization of abandoned paddy soil, but high moisture (100%WHC and shallow submerged condition) had no significant promoting or inhibiting effects to SOC mineralization. 2) Under the same soil moisture condition, SOC cumulative mineralization amounts of abandoned paddy soil in the hydro-fluctuation belt increased as temperature increasing. 3) Under higher temperature, the temperature sensitivity had no significant difference in treatments under different soil moisture conditions, but soil moisture significantly influenced temperature sensitivity under lower temperature. The Q 10 under shallow submerged condition was 2.33, significantly higher than 40%WHC treatment, but had no significant difference with 70%WHC or 100%WHC treatment. With the increase of temperature, temperature sensitivity was significantly decreased under shallow submerged condition, but it changed inconspicuously when soil moisture content was less than 100%WHC treatment. Both temperature and moisture could affect SOC mineralization significantly, but they had no significant interaction effects. 4) Two-pool first-order model indicated that temperature and soil moisture influenced SOC mineralization through influencing the content of labile SOC fraction and the mineralization rate of recalcitrant SOC fraction. Key words: Soil organic carbon; Mineralization; Soil moisture; Temperature; Three Gorges Reservoir

5月15期

5月15期中国农学通报 2012,28(15):106-111 Chinese Agricultural Science Bulletin 旱地小麦休闲期不同耕作措施对土壤水分蓄纳利用与产量形成的影响贺立恒, 高志强, 孙敏, 李青 ( 山西农业大学农学院, 山西太谷 030801) 摘要 : 为了提

Microsoft Word 唐 江_new_.doc

Microsoft Word 唐江_new_.doc