祁连山干旱山地造林对牧草生物量的影响

Effect of Afforestation on the Forage Grass Biomass in the Arid Mountainous Areas of Qilian Mountains

通过对祁连山干旱山地造林地牧草生物量和灌木造林树种生物量、可食生物量的调查分析得知:通过整地造林后,牧草的生物量都有大幅度的提高,其平均产草量为未整地的荒草坡的1 56～2 49倍。E、W坡向在封育措施下的产草量是半封育的1 82和1 67倍,是未封育条件下的2 22和2 14倍。饲料灌木树种的可食量枝叶远远高于纯草场的产草量,其可食生物量为纯草场的2 04～3 11倍;饲料灌木林地的地上部分生物量为草本植物的5 30～7 60倍。并根据饲料灌木树种的营养成分分析结果,论述了草场发展灌木饲料林的价值。由此说明,在祁连山区逐步发展饲料灌木林,建立立体草场是草场生态建设的一个重要方向。

The biomass of the forage and the edible biomass of afforestation bush trees species in arid mountainous afforestation areas of Qilian mountains were investigated. The result showed that the forage biomass increased greatly in soil preparation area. Its average productivity was 1.50～2.49 times as unpreparated ones. The eastern and the western hillside in enclosed area were 1.82 and 1.67 times as semi-enclosed area, 2.22 and 2.14 times as natural area. The forage bush trees' edible branches and leaves were 2.04～3.11 times as mono-grassland, its ground part was 5.30～7.60 times as grass'. Analysis of forage bush trees' nutrition content showed that developing forage bush, constructing stereo-grassland is an important way of the grass eco-construction in Qilian mountainous.