沙棘、侧柏混交林效益的研究

The Benenfits in the Hippophae rhamnoides Mixed With Platycladus orientalis Stands

对陕西省永寿县不同立地，７～８年生人工沙棘、侧柏混交林的研究结果表明，立地条件不同，混交林时侧柏生长的促进作用不同，以沟坡台地效果最好；在同一立地上，混交林与侧柏纯林相比，能明显改善小气候，减少土壤而失，改善土壤肥力状况，特别是氮、磷含量分别提高了４１．８５％和４１．０％，显著增加侧柏树高、胸径和材积生长量。

The stuy on 7 to 8-years-old mixed stands of Hippophae rhamnoides andplatycladus orientalis in Yong Shou county,Shaanxi province shows that the improvement ofmixed stand to Platycladus orientalis varies with site conditions,and best result could be achivedon the tableland of gully slope. Comparing with P. orientalis pure stand,the mixed stand couldimprove micro environment condition and soil fertility(the contents of P and N have been en-hanced by 41%and 41.85%),conserve the soil and water,and abviouslv increased the incre-ments of hight, diameter and volume for P. orientalis trees.