摘要
比较研究了落叶松水曲柳混交林及落叶松,水曲柳纯林的土壤含水量、土壤温度、土壤 pH 值、土壤全量矿质元素含量和树冠中各部位温度、照度和湿度等。结果表明,不同林分的土壤条件不同,同一林分不同土层的土壤条件也不同。混交林的各层土壤含水量、土壤温度、土壤 pH 值均高于纯林;随土壤深度的增加、各林分的土壤含水量、土壤温度、土壤 pH 值降低。与纯林相比,混交林土壤 N、P 含量较高,Cu、Zn、Mn、Ca、Mg、Fe、K 含量较低。不同林分的地上部生态条件也不相同,与落叶松纯林相比,混交林改善了林内的生态条件,使气温降低,湿度升高。这恰好有利于树木的生长。可以看出,落叶松水曲柳混交林的增产机制与其对生态条件的改善有关。
Water content,temperature,pH,and total contents of different mineral elements of soil,light intensity and temperature of different directions of crown, and humidity under crown were studied comparatively in mixed larch—ash stand,and pure larch and ash stand.The results indicate that soil conditions are different at different kind of stands;soil conditions of different soil layers of the same stand are different either.Water content,temperature,and pH of soil are higher in mixed larch—ash stand than those in pure stands;and in each kind of stands they decreased with the increase of soil depth.Compared with those in pure stands,N,P contents of soil are higher in mixed stand,but Cu,Zn,Mn, Ca,Mg,Fe,K contents are lower in mixed stand.Ecological conditions above soil in different kind of stands are different either.Compared with pure larch stand,mixed stand improved ecological conditions,decreased temperature,and increased humidity,which are advantageous to larch growth exactly.The mechanism of production increasing of mixed larch—ash stand has something to do with its improvement on ecological conditions.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1996年第2期8-13,共6页
Journal of Northeast Forestry University
基金
国家自然科学基金
关键词
长白落叶松
水曲柳
混交林
增产机制
生态条件
Larix olgensis Henry
Fraxinus mandshurica Rupr
Mixed stand
Mechanism of production increasing
Ecological conditions
