石灰性土壤微生物量碳、氮与土壤颗粒组成和氮矿化势的关系  

Relationships of microbial biomass carbon and nitrogen with particle composition and nitrogen mineralization potential in calcareous soil.

作　　者：金发会[1,2] 李世清[1,2] 卢红玲[1] 李生秀[3] 

机构地区：[1]西北农林科技大学/中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室 [2]西北农林科技大学资源环境学院,陕西杨凌712100 [3]西北农林科技大学资源环境学院

出　　处：《应用生态学报》2007年第12期2739-2746,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(90502006;30571116);西北农林科技大学创新团队资助项目.

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(N0)、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N0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、N0与土壤物理性粘粒(<0.01 mm)呈显著或极显著正相关,而与物理性砂粒(>0.01 mm)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.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.

关 键 词：微生物量碳 微生物量氮 氮素矿化势 土壤颗粒组成 

分 类 号：S153.6[农业科学—土壤学]