钠添加对亚热带森林凋落物分解及其微生物活性的影响

发布时间：2018-08-04 15:38

【摘要】：以南京紫金山针叶林优势种马尾松(Pinus massoniana Lamb.)和阔叶林优势种栓皮栎(Quercus variabilis Bl.)凋落物为材料,通过室外连续6个月不同钠水平处理(0、0.005%、0.050%和0.500%的NaCl水溶液),研究了钠元素对亚热带森林凋落物分解系数、土壤微生物活性和土壤胞外酶活性的影响。结果表明:0.005%NaCl水溶液能够正向调节土壤微生物的呼吸活性,加快土壤中凋落物的分解过程。而0.500%NaCl水溶液处理显著降低了2种林型中土壤微生物活性和凋落物的分解系数,减弱了凋落物分解系数与碳、氮、磷矿化相关的土壤微生物胞外酶活性之间的相关性。0.500%NaCl水溶液长期处理有可能减缓森林土壤有机质养分的释放,增加陆地森林生态系统碳的储存。
[Abstract]:The dominant species of Pinus massoniana (Pinus massoniana Lamb.) in Zijinshan coniferous Forest of Nanjing And dominant species of Quercus variabilis (Quercus variabilis Bl.) in broad-leaved forests The effects of sodium on the decomposition coefficient of litter, soil microbial activity and extracellular enzyme activity in subtropical forest were studied by the treatment of different sodium levels (0.050% and 0.500% NaCl aqueous solution) outside for 6 months. The results showed that the aqueous solution of 0. 005 NaCl could positively regulate the respiration activity of soil microorganisms and accelerate the decomposition of litter in soil. However, 0.500%NaCl aqueous solution treatment significantly decreased soil microbial activity and litter decomposition coefficient, and decreased litter decomposition coefficient and carbon, nitrogen, carbon and nitrogen. Correlation between extracellular enzyme activities of soil microorganisms related to phosphate mineralization. Long-term treatment with NaCl aqueous solution could slow down the release of organic matter from forest soil and increase carbon storage in terrestrial forest ecosystem.
【作者单位】：江苏徐淮地区淮阴农业科学研究所;南京大学;
【基金】：国家农业部公益性行业(农业)科研专项(201203033-07) 国家小麦产业技术体系项目(CARS-3-2-13) 淮安市重点研发计划项目(HAN2015032)
【分类号】：S714

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