日本落叶松在山西太行山南段平顺山地引种的效果分析

一、生态条件的比较日本落叶松[Larix Kaempferi(lamb.)Carr.]是速生的针叶树种之一。原产地仅局限于日本本州岛的中央高地和关东山地,分布区很狭窄,介于东径136°45′-140°30′,北纬35°08′-38°05′,海拔高1300-2680(1000-2800)m,呈星散分布。较大面积的天然纯林和针叶树种混交林分布在高达3000m的飞(?)山、木曾山、赤石山脉和御岳山及关东山地的富士山、天守山、八岳、浅间山一带的火山坡地。这一地带总的属温带海洋性季风气候,比大陆同纬度温和,夏季生长期多雨,相对湿度大。但由于日本落叶松的原产地处于亚热带暖温带过渡地带的高海拔山区,为内陆性气候,雨量较沿海为少;特别是山地气候

A ANALYSIS OF EFFECT OF JAPANESE LARCH INTRODUCTION IN SOUTH OF TAIHANG MOUNTAINS IN SHANXI PROVINCE

The introduction of Japanese larch in Pingshun mountain ous region locatedin south Taihang mountains was investigated. The results indicate that the eco-logical conditions in Taihang mountains of introducing Japanese larch is simi-lar to that in orginal place, while the differences of ecological conditions in Pingshun mountain are that the Taihang mountain regionis situated at interiorconcinent of china, where has quite clear continental climate, the difference inmean temperature between summer and winter is larger, and the annual prec-ipitation is only 33.5-61.4% of that in original place, the relative humidityis 8-18% lower than that in original place. Precipitation and humidity arethe leading ecological factors for introducing Japanese larch in Taihang mo-untain region. Therefore it is suitable to select the sites located in shade orsemishade slopes at 1300-1600m above sealeveI for introducing Japanese larchwhere the soil layer is deep, the soil is moist, and the air humidity ishigh. Meanwhile, under the same site conditions, the Japanese larch growsquickly, the annual height increment is 2.13-3.87 times as much as that inChinese Pine (Pinus tabulaeformis Carr. ),which is the main cultivated spe-cies in local place; moreover, the annual height increment and DBH of thedominant trees are 1.09m, 1.18cm respectively. As a whose, it is successfulto develope Japanese larch in the south of che Taihang mountains and thetemperate zone of south till 39 degrees north latitude.