【摘要】 对半干旱风沙区疏林式草牧场防护林的生物效益进行了研究。研究表明：疏林式草牧场防护林不仅可以提高疏林内牧草的地上部分生物量及地下部分生物量．同时可明显影响林内牧草地上部分生物量的生长动态。此外，疏林式草牧场防护林还可以提高林内牧草的质量。更多还原

【Abstract】 In the paper. the biological effects of protective plantation of sparse woods on grassland and pastureland in the semi-arid windy and sandy area were studied. Compared with the open area. the protective plantation of sparse woods has obvious biological effects. It not only increases herbage biomass aboveground and underground but also affects the seasonal dynamic of herbage biomass. In addition. it can improve herbage quality in woods.更多还原