半干旱黄土丘陵沟壑区人工混交林土壤抗蚀性研究初报

A Preliminary Report of Study on Soil Anti-erodibility of Mixture-planted Forest in Semiarid Loess Hilly Gully Region

半干旱黄土丘陵沟壑区,在同一条件下,0～100cm土层内,有机质和水稳性团粒抗蚀性指标,混交林较纯林分别高38%和23%;分散率和分散系数抗蚀性指标,混交构较纯林分别低3.5%和3.9%。经差异显著性检验,有机质和水稳性团粒抗蚀性指标,以99%概率保证,差异极显著,分散率和分散系数抗蚀指标,以95%概率保证,差异显著。但分层指标不规律。

This paper studies main'y soil anti-erodibility indices of mixture-planted and pure-planted forest. Results show that soil organic material and waLer stable aggregate contents of mixed forest are greater than those of pure forest by 38% and 23% respectively, rate and coefficient of soil dispersion of mixed forest are less than those of pure forest by3.5% and 3.9% respectively in 0-100 cm soil layers under the same condition. The difference of organic material and water stable aggregate contents between mixed and pure forest-land is extremely significant. The difference of rate and coefficient of dispersion between mixed and pure forest-land is significant,but the indices of various soil layers is irregular.