华北落叶松人工林林分密度对土壤持水能力的影响

The influence of stand density on soil water-holding capacity of Larix principis-rupprechtii Mayr. plantation

为了评价冀北山地华北落叶松人工林土壤水源涵养功能高低,以木兰林管局华北落叶松人工林为研究对象采用四分法对不同林龄不同密度的华北落叶松土壤持水能力进行研究。结果表明:20、30、40、50 a华北落叶松人工林,对应的林分最佳密度分别为2 500株/hm2、1 800株/hm2、1 000株/hm2、800株/hm2时,土壤最大持水量和有效持水量均达到最大。随着林分密度增加,土壤层最大持水量和有效持水量呈先增加后减小的趋势。并根据土壤持水能力随林分密度的变化规律和林木生长规律的相关关系,编制华北落叶松人工林土壤持水能力的密度控制图,为冀北山地华北落叶松水源涵养林的密度管理提供数据参考和理论依据。

In order to evaluate the mountainous northem Hebei Province Water Conservation plantation of Larix princip＆-rupprechtii level function, in Mulan Forestry Management Bureau of Larix principis-rupprechtii plantation as study object of holding water of different ages in different density of Larixprincipis-rupprechtii soil ability using four points methods. The results show that： 20, 30, 40, 50A North China larch plantation, the optimal stand density respectively was 2 500 plants/hm^2, 1 800 plants/hm^2, 1 000 plants/hm^2, 800 plants/hm^2, maximum water holding capacity and effective moisture reached their maximum. As the density increased, soil maximum water holding capacity and effective moisture was increased first and then decreased trend. Correlation and based on soil water holding capacity with increasing stand density changes and growth rule, density control diagram of Larix principis-rupprechtii plantation soil water holding capacity, density management for the mountainous northern Hebei Province in North China larch forest for conservation of water suoDlv to orovide data reference and theoretical basis.