木麻黃類耐鹽性之比較研究

A Comparative Study on the Salt Tolerance of Casuarina Species

陳燕章(Yen-Chang Chen)

《林業試驗所研究報告季刊》 1卷1期 (1986/09) Pp. 31-44

https://doi.org/10.7075/BTFRI.198609.0031

摘要

本研究係以本省自採之木賊葉木麻黃、銀木麻黃及新引進之銀木麻黃為對象，採用複因子之逢機完全區集試驗設計，由不同苗齡（6及12個月生），不同鹽分濃度（25及35‰）與不同淹浸時間（3及5日）等處理進行試驗，以比較其耐鹽性之差異並分析其可能原因。
苗木經處理後之高生長，殊遭鹽分濃度所影響，且呈顯著性；惟地徑生長則不然。各樹種之成活率顯呈差異，主遭樹種、苗齡及淹浸時間所影響。苗木地上部之累積離子除Na(上標 +)外，他如K(上標 +)、Mg(上標 ++)及Cl(上標 -)等離子濃度均遭樹種、苗齡、鹽分濃度及淹浸時間所影響，且呈顯著性。各離子之濃度除Na(上標+)外，K(上標 +)、Mg(上標 ++)及Cl(上標 -)等均與苗木成活率具顯著相關。K(上標 +)及Mg(上標 ++)呈正相關，惟Cl(上標 -)則呈極顯著之負相關，其相關係數高達-0.86，卽Cl(上標 -)離子對苗木生長殊具毒害作用。本試驗以新引進之銀木麻黃6個月生苗木之耐鹽性為最強，因其成活率最高(98%)；然其12個月生苗木之成活率則最低（僅70%），故耐鹽性最弱。

關鍵字

木賊葉木麻黃 ； 銀木麻黃 ； 耐鹽性

並列摘要

Seedlings of Casuarina equisetifolia, C. glauca, and recently introduced C. glauca were tested in the present expriment. The treatment conditions of seedling age at the flooding period (6 or 12 months old), salt-water concentration (2.5 or 3.5%), and length of flooding time (3 or 5 days) varied at two levels according to a factorial design.
After treatment, the seedling height growth, but not the diameter increment, was strongly affected by the salt-water concentration. The survival percentage of these species were significantly influenced by seedling age and the length of flooding time, and hence varied largely. Except for sodium, the concentrations of potassium, magnesium, and chloride accumulated in the seedlings were all significantly affected by tree species, seedling age, salt-water concentration, and length of flooding time. The concentrations of potassium, magnesium, and chloride, but not sodium, were significantly correlated with the survival percentages of seedlings. However, the chloride concentration had a strong negative correlation and its correlation coefficient was as high as -0.86. This demonstrated the high toxic effect of chloride ion on the growth of seedlings. In this experiment, the recently introduced C. glauca seedling of 6-month-old was the most salt tolerant due to its highest survival percentage (98%). On the other hand, the survival percentage of the recently introduced C. glauca of 12-month-old was the lowest (70% only) and hence its salt tolerance was also the lowest.

並列關鍵字

Casuarina equisetifolia ； C. glauca ； salt tolerance