黄土丘陵半干旱区不同作物生态效能研究

深入研究特定生态环境条件下不同作物生产力及其生态效能,对于合理调控农田生态系统,探讨提高系统生产力途径具有重要意义。60年代以来,在国际生物学计划(IBP)的影响下,美国、日本、菲葎宾等国先后进行了小麦、水稻、大豆等作物农田生态效能研究。我国于“六·五”期间分别在南方稻区、黄淮海平原以及北方灌区等不同农业区开展了多种作物种植制度生产力问题研究,并取得重

Study on the Ecological Effect of Different Crops in Semi-Arid Loess Hilly Region.

Based on three years field experiments at Dingxi county of Gansu province, this paper compares and analyses the primary productivity, climatic resource utilization efficiency, characteristics of energy and matter cyclings and water adaptability of various crops such as spring wheat, pea, hyacinth bean, naked-oat, crown-flax, millit, potato, lucerne, sweatclover and sainfoin etc. It is considered that the development of grassland agriculture and the establishment of a new cropping system combining cereal crops and fodder grasses in proper proportion are scientific for the semi-arid Loess hilly region. Increasing field input and soil fertilization are critical to enhancing farmland productivity.