长白落叶松的人工纯林与天然水曲柳混交林生理特性的研究

PHYSIOLOGICAL CHARACTERISTICS OF PURE ARTIFICIAL LARIX OLGENSlS FOREST AND ITS MIXED FOREST WITH NATURAL FRAXINUS MANDSHURICA RUPR.MIXED FOREST

本文测定了人工针阔混交林,在不同天气下（晴天、阴天、雨天）CO2的梯度分布,长白落叶松与水曲柳混交林及长白落叶松纯林的生理特性。结果表明:长白落叶松与水曲柳混交林的净光合速率比长白落叶松纯林高42.5%,其日进程均呈双峰曲线形式。混交林中的长白落叶松叶绿素含量高于长白落叶松纯林的48.44%,长白落叶松光补偿点为1000 LX,光饱和点为5万 LX。长白落叶松的混交林和纯林蒸腾强度日变化呈单峰曲线形式。长白落叶松纯林蒸腾强度比混交林中的长白落叶松高2.4%。混交林中的长白落叶松蒸腾效平为5g 干物质/kg 水,而长白落叶松纯林为2.8g/kg 水。长白落叶松在混交林和纯林的有机物及矿质元素含量不同,混交林中的长白落叶松的蛋白质、脂肪、全糖含量比落叶松纯林高。混交林中长白落叶松体内 N、Mn 含量增加,混交林中的水曲柳内 P、K、Mn 比水曲柳纯林高。混交林的土壤 N、P、K、Mg 和 Zn 含量比长白落叶松纯林高。混交林中的长白落叶松吸收32 p 比长白落叶松纯林快,数量大。混交林中土壤 PH 值和温度比长白落叶松纯林高。综上所述可以看出混交林改善了土壤营养状况,改变了生态环境,因而提高了初级生产力和生物产量。

The vertical distribution of CO_2 gradient in the artificial mixed broad-leaf tree/conifer forest on different climatic conditions (clear, cloudy,rainy) and Larix olgensis Henry physiological characteristic in its pure forest and its mixed with Fraxinus mandshurica Rupr.were determined. Results indicate that the net Larix olgensis Henry Photosynthetic rate is higher in its mixed forest with Fraxinus mandshurica Rupr.than that in the pure stand by 42.5?/0,and their diurnal patterns show bi-peak.The Larix olgensis Henry chlorophyll content in the mixed forest is higher than that in pure forest by 48.44%.Larix olgensis Henry light compensation point is 1000 Lx,and its light saturation point is 50000Lx. The diurnal processing o,f transpiration of Larix olgensis Henry in both the mixed forest and the pure forest show monopeak.Larix olgensis Henry transpiration rate is higher in the pure stand than that .in the mixed stand by 2.4%.Larix olgensis Henry transpiration efficiency is 4.0g/kg in the mixed stand,and 2.8g/kg in the pure stand. The contents of organic substance and mineral element of Larix olge- nsis Henry different in different kind forest.The contents of protein, fat,and total sugar of Larix olgensis Henry are respectively higher in the mixed stand than those in pure stand.The quantity of N,Mn in Laric olgensis Henry,P,K,and Mn in Fraxinus rnandshurica Rupr.,and N,P,K, Mg,and Zn in soil are respectively higher in the mixed stand than those in pure stand. The P absorption of Larix olgensis Henry is faster and more in mixed forest than that in pure forest.The soil pH and soil temperature in mi- xed forest are higher than,those in pure forest. From all that above,the results are that mixed forest improved soil nutrient condition,and ecological environment,so improved primary productivity and biomass.