【摘要】 对苏北地区3种杨农复合经营模式:宽窄行模式(简称K模式),片林模式(简称P模式)和网格模式(简称W模式)的土壤活性碳组分含量及其分布特征进行研究,结果表明:不同杨农复合经营模式对3种土壤活性碳组分都具有一定的影响,相比之下,可矿化碳含量更能反映土壤有机碳库对不同杨农复合经营模式的响应;不同杨农复合经营模式土壤活性碳组分在垂直分布上总体都有随土壤深度的增加而降低的趋势,分布规律相似;相关分析表明,不同杨农复合经营模式土壤可矿化有机碳、水溶性有机碳、微生物生物量碳与土壤总有机碳含量呈现极显著正相关关系,相关系数分别为0.67、0.77、0.61,都可作为表征土壤碳平衡和土壤肥力变化的理想指标。更多还原

【Abstract】 The fraction content and its distribution of active soil carbon under three poplar-crop intercropping patterns are studied in Northern Jiangsu.The results show that the different poplar-crop intercropping pattern has a great influence on the fraction content of active soil carbon;Relatively,the content of mineralizable carbon is a more realistic reflection of soil organic carbon pool on different patterns of response.The fraction content of active soil carbon in the profile decreases generally with soil depth increasing under the three patterns,and the changes are similar.Correlation analysis show that soil organic carbon is significantly related to MC,WOC and MBC with the coefficients of 0.67,0.77,0.61 respectively.So MC,WOC and MBC can be used as an important indicator of soil carbon balance and changes in soil fertility.更多还原