中文摘要：

生物炭如何影响土壤磷素的有效性目前尚不清楚。本研究以稻草和白杨树枝为原料，采用室内培养方法，研究了300℃、450℃和600℃制备的生物炭在5、15和40g／kg施用量下对水稻土Olsen-P的影响。与树枝炭相比，稻草炭显著提高了水稻土Olsen．P含量；3种温度制备的稻草炭对水稻土Olsen-P的影响不存在显著差异；3种施用量稻草炭均显著提高了水稻土Olsen-P含量。生物炭制备原料和施用量均显著影响土壤磷素的有效性，不同温度制备的生物炭对土壤磷素的有效性影响不显著。

英文摘要：

Little information is available on biochar effects on phosphorus （P） availability in soil. Effects of the rice- residue-chars pepared at 300℃, 450℃ and 600℃, and the poplar-branch-char prepared at 450℃ with the rates of 5, 15 and 40 g/kg, respectively on P availability in paddy soils were studied by using indoor incubation. The Olsen-P content increased significantly in paddy soil amended by the rice-residue-char compared with the poplar-branch-char under the same conditions. There were no significant differences in Olsen-P contents of paddy soils amended by the rice-residue-chars prepared at 300℃, 450℃ and 600℃, respectively. The results demonstrated that P availability in paddy soil is significantly affected by the amended biochar prepared by different feedstock and by application rate of the amended biochar, but not affected by the amended biochar prepared at different temperatures.