DENG Piaoyun,7,ZHOU Yunchao,et al.Control Factors of Soil Microbial Biomass Phosphorus in Stands of Chinese Fir Plantations With Different Ages in Huitong, Hunan Province[J].Research of Soil and Water Conservation,2019,26(01):260-265.
不同年龄杉木林MB-P的调控因子
- Title:
- Control Factors of Soil Microbial Biomass Phosphorus in Stands of Chinese Fir Plantations With Different Ages in Huitong, Hunan Province
- Keywords:
- path analysis; microbial biomass P; Bray 1-P; inorganic phosphorus fraction; organic phosphorus fraction
- 分类号:
- S714.2
- 摘要:
- 选取会同县不同林龄（3年生、8年生、18年生、26年生）杉木人工林为研究对象，测定其土壤全磷（TP）、有效磷（Bray 1-P）、微生物量磷（MB-P）、无机磷和有机磷组分，利用逐步回归分析和通径分析揭示各土壤磷素因子和理化因子对MB-P影响较大的优势因子。结果显示：（1）4种不同林龄杉木林土壤MB-P含量的平均值为6.90 mg/kg。TP和Bray 1-P含量的平均值分别为320.71 mg/kg，1.77 mg/kg，均属低水平。（2）不同龄林各因子对MB-P的影响：3年林，Bray 1-P，Al-P对MB-P的影响较大；8年林，N/P，LO-P、土壤含水率（W）、MRO-P对MB-P影响突出；18年林，Fe-P，N/P，Al-P，Bray 1-P对MB-P的作用明显；26年林，Fe-P，TP对MB-P的影响较大，Ca-P，pH，P%，MLO-P直接或间接地对MB-P产生较大影响。综上，不同林龄各因子对MB-P的影响程度不同。
- Abstract:
- Changes in total P, Bray 1-P, microbial biomass P, inorganic P and organic P fractions in soils were investigated in four aged Chinese fir plantation forests (3, 8, 18 and 26-year-old stands) in Huitong, Hunan Province, China. Stepwise regression analysis and path analysis were used to reveal the dominant factors affecting soil microbial biomass P form phosphorus factors and soil physical and chemical properties. The results showed that:(1) the average value of the microbial biomass P content was 6.90 mg/kg in the four examined aged stands. the average concentrations of total P and Bray 1-P were 320.71 mg/kg, 1.77 mg/kg, respectively, but they were all at the low levels; (2) the influence of factors on MB-P in four aged Chinese fir plantation forests:In 3-year-old stand, Bray 1-P,Al-P were significantly positively correlated with MB-P; in 8-year-old stand, N/P,LO-P, soil water,and MRO-P were positively correlated with MB-P; in 18-year-old stand, Fe-P,N/P, Al-P,Bray 1-P were positively correlated with MB-P; in 26-year-old stand, Fe-P, TP were positively correlated with MB-P. In conclusion, different factors of stands with different ages had different influence on MB-P.
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备注/Memo
收稿日期:2018-1-7;改回日期:2018-2-1。
基金项目:国家林业公益性行业科研专项（201404316）；湖南省科技重点研发计划项目（农业支撑领域）（2015NK3025）
作者简介:邓飘云(1989-),女,湖南邵阳人,博士研究生,主要从事森林培育与森林资源资产评估工作。E-mail:dengpiaoyun@163.com
通讯作者:刘明礼(1964-),男,贵州贵阳人,学士,高级工程师,主要从事林业调查规划设计工作。E-mail:330350851@qq.com