石质山地君迁子直播造林试验

为了克服石质山地直播造林旱害和寒害等问题，提高出苗率和保存率，保证该类地区的植被恢复效果，以抗逆性较强的北方乡土树种君迁子为试验树种，研究了生根粉浸种、保水剂拌土、覆膜、覆草、覆石块对造林地土壤微环境及君迁子出苗和生长的影响。结果表明:①地膜覆盖增加了土壤日平均温度；覆草和覆石块降低了土壤温度。②覆膜、覆草和保水剂拌土提高了土壤中的含水量和土壤抗旱能力。③覆膜、覆草、覆石块能显著提高出苗速率和出苗率，覆膜显著提高幼苗生长，保水剂拌土和生根粉浸种作用不明显。④播种180 d，各处理的幼苗保存率、苗高、地径存在差异，但均未达到显著水平。 

Direct seeding of Diospyros lotus in rocky hills

In order to relieve chilling and drought injuries and improve the emergence rate and preserving rate to ensure the vegetation restoration in rocky hills in northern China, taking Diospyros lotus, an indigenous tree species with stress resistance as sample, effects of different treatments, including mulching film, grass cover, block cover, a water retaining agent, rooting powder and open field (control), on direct seeding were studied. The results showed that: 1) mulching film increased average daily temperature of soil, while grass cover and block cover decreased it; 2) mulching film, grass cover and water retaining agent could improve the content of soil water and enhance the dry resistance of soil; 3) mulching film, grass cover and block cover had significant higher emergence speed and emergence rate; mulching film could promote the growth of seedlings, while water retaining agent and rooting powder had no significant effect; 4) after 180 d of seeding, no significant differences were found in preserving rate, seedling height and ground diameter among all treatments.