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以川中丘陵区柏木低效林改造10年后的四种模式:纯杂交竹模式(Bambusa pervariabilis×Dendrocalamopsis daii)(CZ)、柏木(Cupressus funebris)+桤木(Alnus cremastogyne Burk.)+杂交竹模式(BZQ)、柏木+麻栎(Quercus acutissima Carruth)模式(BL)、柏木+杂交竹模式(BZ)为研究对象,纯柏(CB)为对照,对土壤有机碳含量和土壤活性有机碳不同组分含量及土壤理化性质进行了研究。结果表明:(1)土壤有机碳含量和土壤活性有机碳不同组分含量均随着土层深度的增加而下降。不同模式0~40 cm土层土壤有机碳含量和土壤易氧化碳、颗粒碳、微生物量碳和水溶性碳含量均为BZQ>CB>BZ>BL>CZ(P<0.05),表明BZQ模式在提高土壤有机碳方面作用最明显。(2)相关分析表明,土壤有机碳含量和土壤易氧化碳、颗粒碳、微生物量碳和水溶性碳含量均呈极显著正相关(P<0.01),土壤活性有机碳不同组分之间也正相关。(3)土壤湿度、全N、全P、全K、硝态氮、铵态氮和速效钾含量与土壤有机碳含量和土壤活性有机碳不同组分呈正相关,土壤温度与微生物量碳含量极显著正相关(P<0.01),而与水溶性碳含量极显著负相关(P<0.01)。
Based on four patterns 10 years after the transformation of low-effect cypress forests in central Sichuan hilly region, Bambusa pervariabilis × Dendrocalamopsis daii (CZ), Cupressus funebris + Alnus cremastogyne Burk. + Hybrid bamboo (BZQ), Quercus acutissima Carruth (BL), Cedarwood + hybrid bamboo (BZ), and pure cypress (CB) as control. Soil organic carbon content and soil active organic carbon Sub-content and soil physical and chemical properties were studied. The results showed that: (1) The content of soil organic carbon and the content of soil active organic carbon decreased with the increase of soil depth. The contents of soil organic carbon and the contents of soil vulnerable carbon, particulate carbon, microbial biomass carbon and water-soluble carbon in 0-40 cm soil layer were BZQ> CB> BZ> BL> CZ (P <0.05) The role of soil organic carbon is most obvious. (2) Correlation analysis showed that there was a significant positive correlation (P <0.01) between soil organic C content and soil CO 2, C, MB and C (P <0.01) Positive correlation. (3) The contents of soil moisture, total N, total P, total K, nitrate nitrogen, ammonium nitrogen and available potassium were positively correlated with soil organic carbon content and soil active organic carbon components. Soil temperature and microbial biomass carbon (P <0.01), but significantly negatively correlated with water soluble carbon content (P <0.01).