河西走廊农田防护林带种草对提高土壤肥力的影响

西北、华北,东北防护林建设的重点工程是在河西走廊建设农田防护林。实行林带种草对于提高土壤吧力、促进林木生长效果良好,还可扩大饲草来源,促进农区畜牧业的发展。本文报道作者1983—1985年期间对河西走廊农田防护林带种草的调查研究。对种草林带不同类型土壤的肥力状况采样化验,并用配对比较法统计分析结果表明;林带种草对土壤有机质含量的影响显著;对全氮含量的影响极显著:对水解性氮的影响极显若;对有效钾的影响显著;林带种草2—3年内,对有效磷含量的影响还不显著.

The Effect of Growing Grasses Within the Protective Forest on Raising Soil Fertility in Hexi Corridor of Gansu

Constraction of protective forest in Hexi corridor is considered a major one among all the projects in the northwest, north China and northeast.The grasses interplanted with trees under the forestation belt not only raise soil fertility and promont the growth of trees but also enrich the forage grass and bring about a great advance in animal husbandry in rural area.The studies on the fertility different types of soils have been performed with sampling for examination and test and using statistical analysis matched by comparison from 1983 to 1985,The results show that there have been a remarkable influence upon content of soil organic matters and effective potassium,in particular,and also upon the total nitrogen and nitrogen hydrolysate.As for effective phosphorus, such effects have not been found yet during the2—3 year of grass growing.