退耕还林地人工幼林抚育技术

选择立地条件相似，人、畜干扰严重的4块退耕还林地块，营造胡桃楸和落叶松人工林。造林后3a内，分别采用常规造林抚育和林农复合经营抚育进行人工幼林管理。每年秋季进行成活率及苗木生长情况调查，并对4个地块人工林林地物理性质进行研究。结果表明：林农复合经营显著提高幼林保存率，促进苗木生长。并对土壤的物理性质产生一定程度的改善作用。本研究为退耕还林等易遭干扰造林地的造林提供了理论依据。

Tending Technique for Artificial Young Stands Recoving Forest from Tillage

Four sites with similar site features but serious disturbance from local people and domestic animals were selected, and plantation forests of larch ( Larix gmelini ) and walnut ( Juglans mandshurica ) were established in 1998. Comparison was made between standard juvenile forest tending and tending by soybean crop growers. The survival rate and the growth rate of the juvenile trees in the plantation stands were surveyed at each fall in the following 3 years. The physical properties of the soil of each stand were also analyzed. The result demonstrates that tending by soybean growers significantly improved the survival rate and the growth of the young trees in comparison to that of standard tending, and the soil physical properties of the stands were improved to some extent. We suggest that this method should be adopted in the reforestation work on sites under heavy disturbance from local people and domestic animals.