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通过在成都平原开展稻麦轮作大田试验,设置了不施肥(CK)、常规无机化肥(NPK)、猪粪25%+化肥(NKM1)、猪粪50%+化肥(NKM2)、猪粪100%(M3)、猪粪150%(M4)6种施肥处理,探讨猪粪施入对土壤碳组分含量及动态变化特征的影响。结果表明:不同生育期对土壤有机碳及其组分含量的变化影响极显著(P<0.01);水稻季不同处理下表层土壤总有机碳(TOC)、水溶性有机碳(WSOC)、溶解性有机碳(DOC)和易氧化有机碳(ROC)含量均随着生育期的推移呈现出先升高再降低的趋势,20~40 cm土层土壤有机碳及其组分含量显著低于表层土壤,且不同处理之间变化幅度小于表层土壤;小麦季表层TOC含量随作物生育期的推移呈增加的趋势,土壤WSOC和DOC含量在拔节期达到最大值,ROC在分蘖期达到最大值,之后下降并趋于稳定;20~40 cm土层土壤WSOC、DOC和ROC变化趋势与表层土壤基本一致,但变化幅度较小;通过对比分析表明,猪粪施入能显著提高土壤TOC及其活性有机碳含量,水稻季和小麦季TOC、WSOC、DOC和ROC含量均在M4处理下达到最大值,最大值分别为18.49和18.62 g kg-1、88.15和93.56 mg kg-1、40.09和69.74 mg kg-1、2.73和2.29 g kg-1,即从提高土壤有机碳的角度来看,150%猪粪施入处理提升效果最为明显。
CK and conventional inorganic fertilizers (NPK), pig manure 25% + chemical fertilizer (NKM1), pig manure 50% + chemical fertilizer (NKM2) and pig manure 100% were set up in the paddy fields of Chengdu Plain. (M3) and 150% (M4) pig manure to investigate the effects of pig manure application on soil carbon content and dynamic characteristics. The results showed that the effects of different growth stages on the contents of soil organic carbon and its components were significant (P <0.01). The contents of total organic carbon (TOC), water-soluble organic carbon (WSOC) Organic carbon (DOC) and organic carbon (ROC) content tended to first increase and then decrease with the growth period. Soil organic carbon and its components in 20 ~ 40 cm soil layer were significantly lower than those in surface soil, And the change range of different treatments was less than that of the surface soil. The TOC content of the wheat surface increased with the growth of the crop, the content of WSOC and DOC reached the maximum at the jointing stage and the maximum at the tillering stage, then decreased The trend of soil WSOC, DOC and ROC in 20 ~ 40 cm soil layer was basically the same as that of surface soil, but the variation range was small. Through comparative analysis, pig manure application could significantly increase soil TOC and active organic carbon , And the maximum values of TOC, WSOC, DOC and ROC in rice season and wheat season all reached the maximum under M4 treatment with the maximum values of 18.49 and 18.62 g kg-1,88.15 and 93.56 mg kg-1, 40.09 and 69.74 mg kg-1, respectively , 2.73 and 2.29 g kg-1, that is, from increasing soil there Machine carbon point of view, 150% pig manure applied to enhance the effect of the most obvious.