摘要
选择三江平原典型小叶章湿地不同水分带上的两种土壤类型(草甸沼泽土和腐殖质沼泽土)为研究对象,对比研究了二者碱解氮(K-N)和全氮(TN)含量的季节变化特征。结果表明:二者不同土层K-N和TN含量的季节变化特征差异较大,前者0-50 cm土层K-N含量以及0-40 cm土层TN含量的变化最为显著,而后者K-N和TN含量的显著变化仅集中在0-20 cm土层;二者不同土层K-N和TN含量的季节变化与不同生长期植物吸收作用、水分条件、降水、有机氮矿化和硝化-反硝化作用等因素有关。TN含量的季节变化还取决于不同时期根际分泌物的产生量以及枯落物分解与有机氮的矿化平衡;尽管K-N和TN含量的季节变化特征在两种土壤不同土层间差别较大,但均可用四次多项式进行模拟,模拟效果比较理想,基本可反映二者K-N和TN含量的季节变化特征。
Two typical soils (meadow marsh soil and humus marsh soil), located in different moisture zones in Calamagrostis angustifolia wetland of Sanjiang Plain, were selected as study objects, and the seasonal change characteristics of alkaline hydrolysis nitrogen ( K - N) and total nitrogen (TN) contents in them were contrastively studled. Results showed that the seasonal change characteristics of K - N and TN contents in different layers of the two typical soils were significantly different. The changes of K - N contents in 0 - 50cm layers and TN contents in 0 -40cm layers of meadow marsh soil were signiticant than those m other layers, while the significant changes of K- N and TN contents of humus marsh soil were only observed in 0 - 20era layers. In general, the seasonal changes of K -N and TN contents in different layers of the two typical soils were mainly correlated with plant absorption in different growth periods, water conditions, precipitation, organic nitrogen mineralization and nitrification - denitri- fication etc. In addition, the seasonal changes of TN contents also rested with the production amount of root scoretion in different periods, and the balance of litter decomposition and organic nitrogen mineralization. Although the seasonal change characteristics of K - N and TN contents in different layers of the two typical soils had significant differences, they all could be fitted by fourorder polynomial, and these models gave a good fit, which reflected the seasonal change characteristics of K -N and TN contents in the two typical soils.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2009年第8期145-149,共5页
Journal of Arid Land Resources and Environment
基金
中国科学院知识创新工程重要方向项目(KZCX2-YW-309)
山东省黄河三角洲生态环境重点实验室开放基金项目(2007KFJJ01)
中国科学院"优秀博士学位论文
院长奖获得者"科研启动专项资金项目(AJ0809BX-036)资助
关键词
碱解氮
全氮
土壤
小叶章湿地
三江平原
alkaline hydrolysis nitrogen
total nitrogen
soil
Calamgrostis angustifolia wetland
Sanjiang Plain