天津滨海生态防护圈植物群落盐分积累与分配规律研究

Accumulation and allocation pattern of salt contents of different plant communities in Tianjin strand ecological protective circle

对天津滨海生态防护圈 4种植物群落盐分离子积累和分配规律研究表明 ,除未计叶片与枯落物外 ,K、Na、Ca、Mg和Cl 5种元素年均积累量草本群落 (343.89kg/hm2 ) >乔灌草群落 (5 9.79kg/hm2 ) >灌木群落(5 5 .4 6kg/hm2 ) >灌草群落 (18.87kg/hm2 )。各植物群落土壤主要盐分离子Na和Cl年积累量有较大差异 ,海滨滩涂草本群落Na、Cl分别为 6 0 .2 2kg/hm2 和 2 18.35kg/hm2 ,灌草群落为 2 .0 4kg/hm2 和 5 .775kg/hm2 ;改良土壤的乔灌草群落为 2 .385kg/hm2 和 11.76kg/hm2 ,灌木群落为 3.95kg/hm2 和 16 .74kg/hm2 。植物各器官盐分积累乔木以根系积累为主 ,灌木枝条积累量略大于根。复层结构群落盐分离子积累呈现极强的层次性 ,乔灌草群落各层次 5种盐分离子积累量占总量百分比为乔木层 >灌木层 >草本层 ;而灌草群落则为灌木层 >草本层。

The accumulation and allocation of salt contents in four plant communities in Tianjin strand ecological protective circle were studied. The results show that excluding leaves and floor, the annual total storages of K, Na, Ca, Mg and Cl are 343.89kg/hm 2 in herb community, 59.79kg/hm 2 in tree-shrub-herb compound storied community, 55.46kg/hm 2 in shrub, 18.87kg/hm 2 in shrub-herb community. The annual storages of Na and Cl in the four communities are respectively 60.22kg/hm 2 and 218.35kg/hm 2,2.385kg/hm 2 and 11.76kg/hm 2, 3.95kg/hm 2 and 16.74kg/hm 2,2.04kg/hm 2 and 5.775kg/hm 2. The allocation patterns of salt contents in organs of different plants are different, trees accumulate salt by root dominantly, but brushes by root and branch at the same time. The proportions of total salt storage in different layers in compound storied community are also different, they are tree>shrub>herb in tree-shrub-herb community and shrub>herb in shrub-herb community.