海水灌溉条件下Salicornia bigelovii的种植密度对个体间养分积累及土壤盐分的影响

Effects of planting density of Salicornia bigelovii under seawater irrigation on mineral contents in plants and saline soils

对海水灌溉下Salicornia bigelovii的不同种植密度及其个体间的养分积累及土壤盐分的影响进行了调查。结果表明:单位面积地上部的干质量随种植密度增加呈平缓增高,符合最终产量恒定法则;个体间竞争株质量随种植密度增加而降低;随S.bigelovii种植密度的上升,土壤的含盐量和电导率(EC)值明显降低,56株/m2处理区钠的吸收量达261.22g,在336株/m2处理区钠的吸收量高达489.99g;随种植密度的增加,个体间的无机盐含量略有下降,但没有显著差异,相反茎、叶中碳和氮含量呈上升趋势。

The effect of planting density （PD） on the growth and nutrient absorption of Salicornia bigelovii was examined under salt （NaCl） treatments. The dry weight of shoot increased in response to PD. The increment in dry matter reached peak value at a certain PD. The dry weight per plant decreased in response to PD owing to individual competition. The electric conductivity （EC） value and the salt content of the soil decreased conspicuously in response to PD. The absorption of sodium （Na） by plant was 261. 22 g/m^2 under the PD of 56 plants/m^2. It increased to 489. 99 g/m^2 under 336 plants/m^2. The mineral contents in plants tended to decrease slightly in response to PD. Carbon （C） and nitrogen （N） content in shoot increased in response to PD.