论文部分内容阅读
贵州是一个亚热带山区省份,73%的土地在喀斯特地区范围内,生态系统脆弱,水土流失严重。为保护土壤资源,于1991~1994年开展了本项试验研究。研究结果表明,在17~23°的坡地上,裸地处理年径流量和土壤侵蚀量分别达3778~5503m3/hm2和1194lt/km2;传统种植法土壤侵蚀量达5779~9545t/(km2·a),随水土流失所带走的养分(N、P2O、K2O)达947~1616kg/(hm2·a)。特别是条带种植法(生物梯化)保护水土资源的显著效果,在栅篱作物种植以后,条带种植处理与传统种植法相比较,1991~1994年其土壤侵蚀量分别减少19.3%、82.2%、77.9%与100.0%,是一项经济有效有发展前景的水土保持增产措施。
Guizhou is a subtropical mountain province. 73% of the land is in the karst area, with fragile ecosystems and serious soil erosion. In order to protect soil resources, this pilot study was carried out from 1991 to 1994. The results showed that the annual runoff and soil erosion of bare land were 3778 ~ 5503m3 / hm2 and 1194lt / km2, respectively. The soil erosion of the traditional planting method was 5779 ~ 9545t / (km2 · a ), And the nutrients (N, P2O, K2O) carried by soil erosion reached 947 ~ 1616kg / (hm2 · a). In particular, the significant effect of strip planting (bio-ladder) on the protection of water and soil resources is that after the planting of fence crops, the soil erosion of striped cultivation decreased by 19.3% from 1991 to 1994 in comparison with the traditional cultivation method, 82.2%, 77.9% and 100.0%, is a cost-effective and promising development plan for soil and water conservation.