摘要
以长白山阔叶红松林主要树种红松、水曲柳、胡桃楸和椴树为研究对象 ,设置 3个水分处理 ,土壤含水量分别为田间持水量的 85 %～ 10 0 % (对照 )、6 5 %～ 85 % (MW )、4 5 %～ 6 5 %(LW )。对不同树种在不同处理下的生长进行测定 ,结果表明 :土壤水分含量对供试树种的单叶面积、单叶干重、叶片数量、茎干重、根长等生长指标均有显著影响。但各个树种对土壤水分胁迫的响应存在明显差异。在中度水分胁迫下 ,红松和水曲柳在总生物量降低的同时增加了地下生物量的比例 ,地下生物量 /地上生物量值比对照组分别提高了 79 31%和 2 3 91%。而胡桃楸和椴树的地下生物量 /地上生物量分别比对照组降低了 4 2 32 %和 7 92 %。在重度水分胁迫条件下 ,供试树种中只有红松的的地下生物量 /地上生物量比对照组提高了 2 7 5 % ,水曲柳、胡桃楸和椴树均呈下降趋势。由此可见 ,在供试树种中 ,红松对土壤水分胁迫的适应性最强 ,水曲柳仅对中度水分胁迫具有一定的适应性 ,而胡桃楸和椴树均不适宜在干旱的环境中生长。
Pinus koraiensis,Fraxinus mandsurica,Juglans mandshurica,Tilia amurensis,the four dominant trees in the mixed forest of broad-leaved and Korean pine at Changbai Mountain,were investigated in terms of their growth responses to different water treatments.The water content were 85% ～100%(CK),65%～85% (MW) and 45%～65%(LW) of field water-holding capacity.The results showed that soil water content had significant effect on the growth indexes such as single leaf area,dry weight of single leaf,number of leaves,dry weight of shoots and root length,etc.However,the responses of tested species to different water stresses were different.Under medium water stress,the ratio values of under-ground biomass/above-ground biomass for P.koraiensis and F. mandsurica increased by 79.31% and 23.91%, compared with that of CK.Whereas,the ratios for J. mandshurica and T. amurensis decreased by 42.32% and 7.92%,respectively.Only P. koraiensis species had high ratio of under-ground biomass/above-ground biomass under severe water stress.Therefore,P. koraiensis was the most drought-tolerant species among the tested tree species, and F. mandsurica only adapted to medium water stress,while J. mandshurica and T.amurensis were unfit for growing in drought conditions.
出处
《生态学杂志》
CAS
CSCD
北大核心
2004年第5期93-97,共5页
Chinese Journal of Ecology
基金
国家自然科学基金项目(39730119)
中国科学院沈阳应用生态研究所创新项目(SCXZD010102)
中国科学院沈阳应用生态研究所领域前沿资助项目。
关键词
水分胁迫
生物量
阔叶红松林
soil water stress,growth,biomass,broad-leaved korean pine forest.
