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中文摘要：
以黄土高原土壤类型和土壤肥力差异较大的25个农田石灰性耕层土壤为供试土样，研究了土壤微生物量碳（BC）、微生物量氮（BN）与土壤氮素矿化势（NO）、全氮（TN）、有机碳（OC）及土壤颗粒组成的关系．结果表明：BC、BN与TN、OC呈极显著正相关（P〈0．01），表明BC、BN与土壤肥力关系密切，可作为评价土壤质量的生物学指标．BC、BN与NO均呈高度正相关，相关系数分别为0．665和0．741（P〈0．01）．BC、BN、TN、OC、NO与土壤物理性粘粒（〈0．01mm）呈显著或极显著正相关，而与物理性砂粒（〉0．01mm）呈显著或极显著负相关，与物理性粘粒和砂粒比值呈显著或极显著正相关，表明土壤有机质主要通过与土壤物理性粘粒复合而形成有机无机复合体．
英文摘要：
Taking 25 surface soil samples of calcareous soil with greater difference in fertility on Loess Plateau as test materials, this paper studied the relationships of soil microbial biomass carbon （BC） and nitrogen （BN ） with soil nitrogen mineralization potential （NO ）, total nitrogen （TN）, organic carbon （OC）, and particle composition. The results showed that Bc and Bn had significant positive correlations with TN and OC, suggesting that BC and BN were highly related with soil fertility and could be used as biological indices of soil quality. BC and BN were highly correlated with NO, with the correlation coefficient being 0. 741 and 0. 665, respectively （ P 〈 0. 01 ）. BC, BN, TN, OC and NO all had significant positive correlations with physical clay （ 〈 0. 01 mm） but negative correlations with physical sand （ 〉0. 01 mm）, and had significant positive correlations with the ratio of physical clay to physical sand, indicating that soil organic matter was mainly combined with physical clay to form soil organic-mineral complexes.
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