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在沿海滩涂防护林带低盐区(0.1%)、中盐区(0.2%)和重盐区(0.4%)3个盐分梯度下,研究了栽植10年的乌哺鸡竹和淡竹Na~+、K~+、Ca~(2+)、Mg~(2+)含量变化及其与生长和光合作用的相关关系.结果表明:从低盐区到重盐区,乌哺鸡竹的立竹密度和地径分别下降30.4%和28.8%,降幅低于淡竹的44.1%和31.2%;两竹种单株生物量下降,地上器官生物量降幅均显著高于地下器官;乌哺鸡竹和淡竹净光合速率(P_n)和PSⅡ最大光化学效率(F_v/F_m)分别下降57.6%和67.7%、6.1%和7.4%,乌哺鸡竹耐盐能力比淡竹强.随着土壤含盐量的增大,乌哺鸡竹和淡竹各器官Na~+含量逐渐增加,K~+、Ca~(2+)、Mg~(2+)含量逐渐降低.两竹种根Na~+积累较多,而地上部分K~+含量较高.盐胁迫环境导致乌哺鸡竹根Ca~(2+)含量与淡竹叶片Mg~(2+)含量明显下降.两竹种的生物量、P_n、F_v/F_m与Na~+含量呈显著负相关,与K~+、Ca~(2+)含量呈显著正相关.
Under salt gradient of low salt area (0.1%), medium salt area (0.2%) and heavy salt area (0.4%) along coastal beach, the effects of Na ~ +, K ~ +, Ca ~ (2 +) and Mg ~ (2+) content and its relationship with growth and photosynthesis were studied.The results showed that: from low salt area to heavy salt area, And ground diameter decreased by 30.4% and 28.8%, respectively, which was lower than that of fresh bamboo by 44.1% and 31.2% respectively. The biomass of two bamboo species decreased and the biomass of above-ground organs decreased significantly than that of underground organs. Photosynthetic rate (P_n) and maximum photochemical efficiency of PSⅡ (F_v / F_m) decreased by 57.6% and 67.7%, 6.1% and 7.4%, respectively.With the salt content increasing, The contents of Na ~ +, K ~ +, Ca ~ (2 +) and Mg ~ (2+) decreased gradually in all organs of Wuzhuban and Dabu bamboo.The accumulation of Na + The contents of Ca ~ (2+) in root of Wucha chicken and the content of Mg ~ (2+) in leaf of bamboo decreased obviously under salt stress environment.The biomass, P_n, F_v / F_m and Na ~ + Content was significantly negatively correlated with K ~ +, Ca ~ (2+) content was significantly positive correlation.