辽西半干旱区典型人工林生态系统的水土保持功能

从森林生态系统地表径流和土壤侵蚀角度对辽西半干旱区5种人工林生态系统的水土保持功能进行了定量研究．结果表明：不同类型人工林生态系统可以有效地减少地表径流及土壤侵蚀．油松纯林、油松-沙棘混交林、沙棘林、小叶杨纯林和小叶杨-沙棘混交林6—9月的月平均地表径流系数分别为荒山（对照）的10．1％、6．5％、2．3％、8．6％和5．3％，土壤侵蚀量分别为荒山的2．65％、0．96％、0．15％、2．32％和0．69％．5种人工林生态系统中，沙棘林的地表径流量和土壤侵蚀量最小，水土保持功能最佳．

Water and soil conservation function of typical plantation forest ecosystems in semi-arid region of Western Liaoning Province

From the aspects of surface runoff and soil erosion, this paper quantitatively studied the water and soil conservation function of five plantation forest ecosystems in semi-arid region of Western Liaoning Province. The results showed that various types of test plantation forest ecosystems were all able to reduce surface runoff and soil erosion effectively. In June -September, the monthly mean surface runoff coefficient of Pinus tabulaeformis forest ecosystem, P. tabulaeformis - Hippophae rhamnoides forest ecosystem, H. rhamnoides forest ecosystem, P. simonii forest ecosystem, and P. simonii -H. rhamnoides forest ecosystem was 10. 1%, 6. 5%, 2. 3%, 8.6% and 5.3% of that of barren hill, respectively, and the soil erosion quantity was 2.65%, 0. 96%, 0. 15%, 2. 32% and 0. 69% of that of barren hill, respectively. Among the five forest ecosystems, H. rhamnoides forest ecosystem had the least surface runoff and soil erosion, being the best in water and soil conservation function.