生物炭对玉米苗期生长、养分吸收及土壤化学性状的影响

Effects of biochar on corn growth,nutrient uptake and soil chemical properties in seeding stage

采用田间盆栽试验,研究了生物炭(biochar)对玉米(Gramineae)苗期生长(60 d)及土壤化学性质的影响。结果表明,在玉米苗期的前33 d,生物炭(48 t.hm-2)对玉米株高的生长有显著抑制作用,但随着玉米的生长发育,生物炭的抑制作用逐渐消失。收获时(播种后60 d),生物炭对玉米植株干质量,N、P养分的吸收量没有显著影响;生物炭(12、48 t.hm-2)能显著提高土壤全N、有机碳质量分数,但对土壤全P、有效P、pH值没有显著影响。土壤全N、有机碳质量分数与生物炭用量(0、2.4、12、48 t.hm-2)为显著正相关(n=12,p<0.01)。

Pot trial was adopted to study the effects of biochar on corn growth（60 d）,nutrient uptake and soil chemical properties in seeding stage.It was shown that biochar（48 t·hm-2） significantly decreased corn height from 13 to 33 days after sowing,but the inhibition effects of biochar gradually disappeared after 39 days.Biochar did not significantly affect the corn dry weight,nitrogen uptake（g·pot-1） and phosphorus uptake（g·pot-1） in seeding stage.Biochar（12,48 t·hm-2） significantly increased soil organic carbon and total nitrogen,but did not significantly affect total phosphorus,available phosphorus and pH.Soil total N,soil organic carbon and biochar amendment rates（0,2.4,12,48 t·hm-2） had significantly positive correlation（n=12,p0.01）.